QST 1930-06: Vol 14 Iss 6

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HAs Your HANDBOOK A BLuceE CoOvER? if not, it isn’t the modern Sixth Edition and you're missing a lot

successive edition of the Handbook has been revised, hot modern ma- ibstituted for the practices that have been outgrown. The Sixth Edition rmation on Crystal Control and Radiotelephony that did not appear in editions, in addition to everything else that the A.R.R.L. can think of guidance of a practical radio amateur. | as the editions were with the brown and the green covers, they are only by comparison with

THE The Sixth Edition < RADIO AMATEUR’ FANDBOOK By Handy & Hull NOW IN ITS SEVENTY-FIFTH THOUSAND This book is a publication of the American Radio Relay League, the a teur’s own organization, written by amateurs for amateurs. It is hailed eve where as the greatest help that an amateur ever saw. {4 Because it starts in the very beginning of the story and tells what amateur radio is, how to be an amateur, how to learn the code and how to operate a simple station, its invaluable and a sympathetic guide for the beginner. { Because it progres through working descriptions and building instructions for many varieties receivers, transmitters, power supplies and antennas, and because it goes i! all the intricacies of station operation and message handling, it is an indisp sable necessity for the proficient amateur. A world of valuable information, printed in “QST” format and bound durable paper covers so that the price may be modest.

Blue-and-Gold Paper Cover, $1.00 Stiff Buckram Binding, 82

without the Handbook. Order yours to-day! a We honestly don’t see how you can get along ©

American Radio Relay League, Hartford, Conn., U. S. A

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(OT Jhe Official Organ of the ARR-L VOLUME XIV JUNE, 1930 NUMBER 6 Editorials Time Signals From W9XAM Radio Manufacturers’ Convention ton ( Dp? the ar led evel tarts in to DeCO on, itis progres arietics goes if indisp bound Getting That D. C. Plate Supply . ne eo George Grammer The Band-box Superhet a a a ae Howard F.. Anderson Advanced Transmitter Design > ee * 2 * wo eo > oe More Progress on 28 Megacycles . . . . . . . . Clark C. Rodimon Experimenters’ Section I.A.R.U. News Communications Department Calls Heard Correspondence Department Atlantic Division Convention Financial Statement Angus Elected Central Division Director Doings at Headquarters Silent Keys Ham-ads and QRA’s QST’s Index of Advertisers QST is published monthly by The American Radio Relay League, Inc., at Hartford, Conn., U.S. A. cial Organ of the A.R.R.L. and the International Amateur Radio Union Kenneth B. Warner (Secretary, A.R.R.L.), Editor-in-Chief and Business Manager James J. Lamb George Grammer Clark C. Rodimon Technical Editor Assistant Technical Editor Managing Editor David H. Houghton G. Donald Meserve Circulation Manager Advertising Manager eA ea wik ee eed ie hw ae hen 55 West 42d Street, New York City Editorial Offices 4 OEE EE ee re Pa tet .... 1711 Park Street, Hartford Subscription rate in United States and Possessions, Canada, and all countries in the American Postal Union, $2.50 per year, postpaid. Single copies, 25 cents. Foreign countries not in American Postal Union, - OO per year, postpaid. Remittances should be by international postal or express Money order or bank draft negotiable in the U. 8S. and for an equivalent amount in U.S. fun Entered as second-class matter May 29, 1919, at the post office at Hartford, Connecticut, under the Act of March 3, 1879. Ac- ceptance for mailing at special rate of postage provided for in section 1103, Act of October 3, 1917, authorized September 9, 1922. Additional entry at Concord, N. H., authorized February 21, 1929, under the Act of February 28, 1925. Copyright 1930 by the American Radio Relay League, Inc. Title registered at United States Patent Office.

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The air is full of pictures re’s many a thrill in television! A thousand times as many as the first radio listeners had through headphones! And bigger, betier, more interesting, more entertaining vision programs are coming! @ Television is getting ahead. Join with us in its ypment. Help us bring television to the point of final achievement. You can quickly build your own RADIOVISOR Mi ANY of you built the earlier Jenkins control and synchronous operation; magni- Radiovisor, with its cardboard disc and _ fying lens as optional equipment. Just the ry motor drive. Now there is a new, job to receive those 48-line, 15-pictures-per- improved kit. It has Faraday eddy current second signals. Remember — Radio-vision motor: simple framing by means of adjust- programs are regularly transmitted by Jen- ab smp-house; accurately drilled scanning kins station W2XCR, at Jersey City, N. J., d nounted on ball bearings; simple speed and W3XK, at Washington, D. C. and others. @ A few hours’ fascinating work, and there’s your kit, all assembled. If you prefer a com- plete Radiovisor, assembled, wired and ready to run, you will want our Model 100 Radiovisor with cast metal base. Q Invite your friends to see radio-vision programs. Their enthusiasm will help develop this new scientific wonder. WRITE FOR COMPLETE DATA—NOW! ...on the Jenkins Radiovisor Kit No. 1, and on the completely assembled Model 100 and Cabinet Model 200. Also ask for literature on radio vision receivers, television lamps, photo-electric cells and other equipment. JENKINS TELEVISION CORPORATION 346-370 Claremont Avenue JERSEY CITY, N. J. Say You Saw It in QST — It Identifies You and Helps QST

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S ners ning n its igni- | the -per- sion Jen- i ee 1ers. pre’s -om- pady ‘isor >see will Ww! | the inet dio- tric ON EDITORIALS HE British amateur societies have an idea which, it seems to us, our clubs might employ with profit. During the pleasant summer weather each club seems to have a ‘field day”’ or outing, and of course, being radio amateurs, the field day is dis- tinctly of a radio complexion. It amounts, in fact, to a kind of radio ‘‘treasure hunt." In the usual case of this kind, in preparation for the field day a competent committee is appointed to assemble and install a low-powered transmitter in an unknown location within, say, twenty miles of the home town. The station is very carefully concealed, hidden in a farmer's barn, or even in a culvert, or camouflaged if necessary, and its loca- tion and direction kept profound secrets. The individual members of the society, singly or in teams of two, equip themselves with portable receivers and loop antennas. On the ap- pointed day they set out separately from their homes, in autos and side-cars, to find the unknown station, which transmits periodically throughout the day on schedule. A bear- ing is taken and the car proceeds in the general direction, stops and sets up for another shot on the next schedule, and so on, leisurely making its away across pleasant country, enjoying the scenery and perhaps picnicking enroute. When the general location of the transmitter is reached the chase frequently becomes exciting, particularly if there are several parties hot on the scent, because then it becomes a case of actually finding the ap- paratus. Sometimes it is hidden in a clump of woods just a few yards away and yet re- mains undetected for hours. The team that first finds it wins the race and the solid gold variable condenser if any. It sounds as if it were great sport. The transmitter location of course becomes the ren- dezvous for “‘eats,’’ sports, and so on. It may be necessary, at some appointed hour, to broadcast the location in plain language to missing searchers who have become lost, strayed or stolen. If their receivers break down and they miss the broadcast, it is just too bad but they have to go back home for supper. Much depends upon the skill and ingenuity of the transmitter committee, of course. In our country it seems that a frequency in the 1715-2000 band would be the best to use, both with respect to the transmitting distance and to make loop reception more feasible. Unless a member of the committee has a portable license it will also mean business with the Supervisor, either to take out a license for the chosen location or to get special au- thority for the one day's operation. Plenty of original ideas will occur to the clubs. With summer at hand, a season in which it normally is difficult to maintain club inter- est, it seems to us that this idea might well be taken up by our American clubs. QST would like to hear the results from any club that tries it. VERY amateur who has written us concerning our recent editorial efforts to make amateurs frequency-conscious and minimize out-of-band operation praises our en- deavor, but most of them go on to say that it wouldn't be a bad idea to mention commercial interference in our bands, which is pretty fierce sometimes. Of course. The commercial skirts are far from clean themselves. Proportionately we're not sure that they're particularly better than we are. But our thought is that everybody must be righc on this important subject and that the rest of the world is improving rapidly, whereupon it 1s up to us to be certain that our own house is put in order promptly. The German station DHE, long a thorn in our 7000-band, has been moved out, largely as the result of a protest which the Radio Society of Great Britain filed with its govern-

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OST JUNE, 1930 months ago Canada chased two infringing commercials out of our 14,000- ymplaint by our Canadian General Manager. Our bands are guaranteed to us | we can always obtain action from the ratifying nations. By the same token, s bands are guaranteed to them and they expect protection too. There is f a spirit of give and take right now, as the radio world buckles down to the f putting everything exactly where it belongs, but it’s our duty here at Head- you fellows everywhere that the world is moving rapidly now to stand- greater precision, to much smaller tolerances, and to the general feeling t that can’t play the game and keep out of trouble have no right to expect to crowded ether of to-day and to-morrow. folks who don’t think we're very important, anyway, and it takes a lot of t ep them convinced. The task will be infinitely easier if we can show that we are assigned. It may become impossible if we don't. That is why it is very t we amateurs be in the clear. “Ge Strays “Ky e Signals from W9XAM irs will remember the time signals tr WNBT, the station of the Elgin N tch Company, Elgin, Ill., a few ve e limited commercial license was cal t June, but the company has ned an experimental license for res se transmissions, under the call v e frequency is 4795 ke. A crystal- c insmitter with an output of 500 lules are as follows: 7 C.S.T., daily except Sunday C.S.T., daily except Sunday C.S8.T., daily except Sunday C.S.T., daily except Saturday and Sunday C.5.T., daily except Saturday and Sunday C.8.T daily except Saturday and Sunday CS8.1 daily except Saturday and Sunday reception of these signals will hey should be sent to the address R Manufacturers’ Association Convention Convention and Trade Show will inicipal auditorium at Atlantic ( r, during the entire week of June 21 t developments in broadcast re on display, together with new n rought out by all the prominent n ; well as those just entering the fir rom the apparatus displays, how- ev rs convention will be of unusual inte e there undoubtedly will be a great on the pentode and its relation K. B. W. to manufactured receivers during the coming year. It is not at all unlikely that the trend of circuit design will be influenced by the conclu- sions reached at the show. Admission to the show will be by invitation only, and tickets may be obtained by writing the Radio Manufacturers’ Association, 32 W. Ran- dolph Street, Chicago. They are issued without charge. A new shaving cream with the name “QSS” has just made its appearance on the market. W9AKN thinks the idea is that when the lather is applied the whiskers just fade out, thus elimi- nating the razor from the picture! If the people that make it had been more in step with the times they'd have called it QSC. Here's a “hot”’ one picked up from a newspaper after the recent rebroadcast of the opening of the London naval conference: ‘“‘ Just a few minutes before King George began the address which formally inaugurated the conference, a member of the control room staff of the CBS tripped over the wires to the generator that energizes the entire network. The chief control engineer grasped the wires together in his hands to restore the circuit. Leakage of the current through his body to the floor shook his arms with spasms, but he held on without a break for twenty minutes until new wires could be connected.” Seems as though even the broadcast people aren't free from the haywire complex. W6ARV has a good way of drilling holes in glass. A finishing nail is placed in a breast drill or drill press, and the head of the nail is used as alap. The compound employed is either valve- grinding compound which has no oil in it or sim- ply carborundum mixed with water. It is ad- visable to use a small piece of board under the glass when drilling. Ju =. es extel 8 si ‘All This only of th cove hot { artic Dev sour TI a bai ator, hot § anal recti pend the tum’

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1930 ,000- CO us ken, re is » the lead- and- sling ct to yt of t we very ming id of nclu- ition r the Ran- hout ss” ‘ket. ther imi- ople mes aper the “wan the staff ator hief r in the his ta yuld yple ; in frill | as ve- im- ad- the June, 1930 OST Getting That D.C. Plate Supply A Resume of the Practical Aspects of Rectifier and Filter Design By George Grammer, Assistant Technical Editor — Quoting the new regulatior “Amateur stations must u ments that produce guivalent effects to minimize frequenc This article has bee written to serve as a quide to those It yy no mear 1 ym plete exposition of the thject, howeve if more detailed information desired. — Epitror “urre nt power supply or arrange- t the familiar with rectifiers and filter tion and preven emission of broad signal ty not be sufficiently the bibliography at the end will be found most useful ITH the advent of revised amateur regulations, it behooves some of us to take stock of our power supply equipment and see how closely we enform to the provision that amateur stations must have “an adequately filtered d.c. plate upply.” A generator or transformer-rectifier with a conglomeration of chokes and condensers does not necessarily provide the type of power supply required ; on the other hand, the apparatus to produce such an effect is not necessarily highly emplicated and expensive, provided it is prop- ely designed There are many factors which enter into the production of a steady d.c. signal, not the least of which is the adjustment of the transmitter Nomatter how good the rectifier and filter system night be, if given a fair chance a poorly adjusted transmitter can nullify its effects to such an extent that a great deal of the money invested is simply wasted. Paraphrasing an old adage, ‘All is not d.c. that has a rectifier and filter.” This article is, however, primarily concerned mly with the power supply system. Adjustment ff the transmitter has been so often and so well covered during the past two years that we shall not go into it now. Suffice to say that those QST uticles covering the results of the Technical Development Program constitute a complete source of information on this subject The only source of really continuous current is ibattery. Probably next in line is the d.c. gener- itor, although the output of such a machine is wot steady and continuous. A generator is simply walternating-current machine with a mechanical retifier, and the smoothness of the output de- pends almost entirely upon the construction of the rectifier, or commutator. The greater the tumber of segments, the better will be the out- put, but an infinite number would be required ior “pure” d.c., whereas insulation considerations m high voltage machines and the actual space limitations are such that the output usually has ‘considerable amount of ripple voltage. This Means that the output of such a machine cannot be considered suitable unless a filter is provided to diminish the ripple to a negligible amplitude. An unfiltered generator is therefore in almost the same category as an unfiltered transformer- rectifier system, and must be treated with the same care. The redeeming feature is that the ripple voltage is in most cases much higher in — TYPICAL CHEMICAL RECTIFIER CONSTRUCTION used for electrodes are lead and may be employed. A wide ariety of solutions has (See bibliog- at end of this article.) The immersed portion of the narily made so that there FIG. 1 The commonest metals aluminum, although some others been used with success r iph 7] will be about one surface for every 50 m.a. the rectifier will be electrodes is ord square inch of required to furnish frequency and lower in amplitude than with the transformer-rectifier at ordinary supply fre- quencies, and consequently a small filter is sufficient, provided the commutator is kept clean and the brushes are properly adjusted. However, the number of amateurs using high voltage d.c. generators is comparatively small; therefore we will for the present confine ourselves to those systems which use a transformer for stepping the voltage up to the required value, following which the output of the transformer is fed into a rectifier and filter. As we cannot hope to go into a great amount of detail in this story, a bibliography on the subject of rectifiers and filters has been prepares and appears at the end of this article. It is reecom- mended that the reader look over it for references which are of particular interest to him. Our present purpose is simply to point out the various methods and types of apparatus which are in use, the selection being left to the individual preferences of the constructor.

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rYPES OF RECTIFIERS vpes of rectifiers are available, each own set of advantages and disad- Che most commonly used ones may be to five general classifications: electro- thermionic, hot-cathode por and mercury-arce. chemical, CHEMICAL RECTIFIERS nical rectifier is perhaps the cheapest rticularly for low-voltage installations. tion is simple, and it will give very results if properly handled. The rop and leakage are somewhat higher P RECTIFIER -* , 9 filter | S@,e- RECTIFIER BRIOGE EMICAL RECTIFIER CIRCUITS ed for every 40 or 50 volts furnished by output upped transformer whose therefore requires about 24 jars, 12 on ige arrangement, two sets of jars are mer voltage, and although this voltage output voltage, the number of jars ¢., 24 jars will be necessary for a her types of rectifiers. The output is, hard to filter, and this fact, together st, should recommend the chemical great number, particularly those wer outfits. tifier usually takes up quite a bit of nding upon the type of cell and solu- th simple solutions, such as borax or soda dissolved in water, the maxi- per cell should not be much higher \ typical cell of this kind is shown elly glass or preserve jar holds the | the electrodes are usually lead and rips. The size of the electrodes is 1 by the current which the rectifier \ current density of about 50 milli- OST JUNE, 193) amperes per square inch of immersed aluminup surface is quite generally used. With organic ele. trolytes, however, much higher voltages than 5 can be used, ranging anywhere from 100 to 1% per cell. The construction of a chemical rectifier of the latter type will be described in a Coming issue. For best results the elements and the con. ponents of the solution should be as nearly cheni- cally pure as possible, and material of this sorts sometimes hard to obtain. Other disadvantags are that the rectifier must be formed initially, anj reforming is necessary if it is allowed to remain idle for any length of time; water evaporates fron the solution and must be replaced at more or leg frequent intervals; and the solution sometime creeps and makes a messy job. Electrically, how. ever, it is entirely adequate for the purpose when properly built. The connections for both the cen- ter-tap and bridge rectifier circuits are given in » Fig. 2. THERMIONIC RECTIFIERS Thermionie tube rectifiers, such as the Typ 80 and ’S81, are now generally used only for th lower voltages. They have been displaced at higher voltages by the more efficient mercury- vapor rectifier. However, they, like the chemical rectifier, are entirely suitable for low-power work and in many respects constitute the most desir able rectifier for sets employing a Type ’10 tule or those of lower voltage rating. A Type ’81 wil pass 85 milliamperes. With a pair of tubes ins full-wave circuit, the allowable current is 17 m.a. The connections for a full-wave rectifier using Type ’81 tubes are shown in Fig. 3. The half- wave rectifier circuit requires only one tube, and the transformer secondary need not be center tapped, but since the output has only half s many “humps” per second as with a full-wave ‘ 0 reer y¢ | Y ' Q990008 TUttT FIG. 83. — FULL-WAVE RECTIFICATION WITH THERMIONIC OR MERCURY-VAPOR TUBES rectifier, it is more difficult to filter. Thermioni tubes are not recommended for use in a bridg rectifier, because their high resistance and lack of close uniformity prevent the tubes from @ viding the load properly. The Type ’80 tube is designed for lower volt ages, and in itself is a full-wave rectifier. The ap plied voltage should be not greater than abot 400 per plate, and the tube will pass 125 m.a. I atl whe

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E, 193) luminun anic eles. | than 0 to 1h | rectifier L Coming the con. ly chemi. is sort is Vantages ally, and D Tema ites from re or les ymetimes lly, how. se when the cen- given in he Type y for the laced a nercury- chemical ‘er work st. desir- 10 tube » 81 wil bes ins t is 17 er using ‘he half- ube, and + center half as ull-wave WITH "UBES ermionit a bridge und lack from de ver volt- The ap n about ) m.a. It JunE, 1930 js thus suitable for sets employing a Type ’10 or smaller tube where the voltage required is not over 400. The connections of the Type ’80 tube in a full-wave rectifier circuit are shown in Fig 5. This tube should not be used when the power transformer furnishes more than 400 volts each side of the center-tap Thermioniec rectifiers are very easily installed, are compact, noiseless in operation, require no particular attention, and will last a long time with reasonable use. Their cost is comparatively small, and they can be obtained at almost any radio sore. The voltage drop through them is not so high as to present any particular difficulty with an amateur transmitter, and is of about the same order as the drop in a good chemical rectifier They are not so good in this respect, however, as the more expensive hot-cathode mercury-vapor rectifiers GASEOUS-CONDUCTION RECTIFIERS Gaseous-conduction rectifiers, such as the Raytheon BH, can be used in transmitters em- ploying a receiving tube as the oscillator, or for the low-power stages of an oscillator-amplifier transmitter where the voltage required is not more than about 300. At the present time these rectifiers are not manufactured for higher volt- ages. Since the tube has no filament, it is un- necessary to have an extra winding on the power transformer for rectifier tube filaments. The volt- age drop in the tube is somewhat less than with a thermionic tube of similar rating. In the field where such a rectifier can be employed, the other advantages are the same as those of thermionic rectifiers. HOT-CATHODE MERCURY-VAPOR RECTIFIERS Mercury-vapor rectifier tubes such as the Type 66,’72 and Rectobulbs are intended for all volt- ages up to about 3500, depending upon the kind of rectifier circuit used. They are, therefore, the tubes to use with sets employing Type '03-A, Type 52 and Type ’04-A tubes. The ratings on these rectifiers are somewhat different from those of thermionic rectifiers, as the operation of the tube is different. With a thermionic rectifier, the voltage which the tube will stand is limited only by the insulation in the tube itself, particularly vetween the wires in the glass stem. This is not the case, however, with mercury-vapor rectifiers, because as the voltage is increased beyond a cer- lain critical value, known as the “‘arce-back”’ volt- ge, a heavy current will flow in the opposite di- rection and ruin the tube. The maximum current which the tube can safely pass is limited by the flament emission. For these reasons, the tubes ue rated at ‘‘maximum inverse peak voltage” ind “‘peak current.” The inverse peak voltage is the highest voltage which the tube can stand, pplied in the opposite direction to normal cur- OST 11 rent flow. The term “peak current’’ is self-ex- planatory. The inverse peak voltage is the peak voltage furnished by the transformer, and in the case of a pure sine wave will be 1.41 times the total voltage across the transformer terminals. For instance, with a full-wave rectifier using a center-tapped transformer, if we assume that the transformer gives 1500 volts each side of the center tap, the total secondary voltage will be 3000, and the in- — || oud =| > S| FIG. 4.—A BRIDGE RECTIFIER WITH MERCURY-VAPOR TUBES This arrangement is used when the power transformer has no center-tap, or when the d.c voltage required ts more than 2000. Four tubes and three filament transformers are necessary. verse peak voltage which each rectifier tube will have to stand will be 3000 x 1.41, or 4230 volts. The peak current depends upon the type of filter employed, or more particularly, is determined by the layout of the input side of the filter. If a 2-ufd. or larger condenser is connected directly across the rectifier output, the peak current through each tube is three times the load current (assum- ing two tubes in the rectifier). In other words, a load of 200 m.a. will mean a peak current of 600 m.a. through each tube which is the maximum safe current for a Type ’66. If an inductance of 10 henrys or more is connected between the recti- fier and the first filter condenser, the factor drops to 1.5.1 Under these conditions, however, the volt- age is not as high as with a condenser across the rectifier without a choke in series. The connections for these tubes are shown in Figs. 3 and 4. For d.c. voltages of 2000 and over it may be found that it is actually cheaper to use the bridge arrangement with a transformer which has only a single secondary winding, since the cost of center-tapped transformers for higher volt- ages is a great deal more in proportion to tube cost than is the case at the lower voltages, and the extra filament windings are relatively inexpensive. The inverse peak voltage with either the cen- ter-tap or bridge arrangement is the same (total transformer voltage times 1.41) so that the bridge connection will give approximately twice the d.c. voltage obtainable with center-tap rectifica- tion. Hot-cathode mercury-vapor rectifiers lend themselves very well to the bridge arrangement, 1A New Type of Rectifier Tube for Amateur Use,” page 20, February '29 QST

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nternal drop is small and the tubes vell. The drop is only about 15 volts the current through the tube. MERCURY-ARC RECTIFIERS iry-are rectifier is the real brute for - work. These rectifiers are capable of pplied a.c. voltages of the order of 100, and will pass a current of several e voltage drop in the tubes is ap- ) volts — the same as in mercury Their cost is comparatively low, the for battery charging being suitable. f fact, a number of amateurs have ised old tubes which they have ob- very low cost from power companies es had begun to operate unsteadily in lighting systems. sary to start the arc each time the be used, and as soon as the load is ire goes out; therefore some means vided for maintaining the are during because the load is being rapidly | off when keying. In order to start ibe must be tipped mechanically so n instantaneous connection between pools in the starting electrodes to re, and in order to maintain it some ep-alive’’ circuit must be employed ercury-are rectifier and circuit are g th live circuit uses a transformer which 50 volts each side of the center tap, a full-wave rectifier with Tungar or bs. In order to maintain the are in tion it is necessary to filter the out- e extent, and for this purpose the in the diagram is used. A small will pass about two amperes without ing is usually sufficient. The primary nsformer rated at 100 watts or more tisfactorily if no choke is available. the circuit will ordinarily be of the nperes, because with less current the likely to go out. Higher keep-alive | heat the tube unnecessarily and may fe FILTER CHOKES kes are in one respect a great deal lio frequency chokes — it is hard to or not the things are operating as Manufacturers’ ratings are often ecause the inductance of the choke with the amount of d.c. flowing in and it has not been the practice to ther the inductance measurements were the rated d.c. flowing, or whether the is simply the maximum which the safely carry, and the inductance is vith a.c. only. A choke which is rated es with no d.c. flowing in the windings OST JUNE, 193) can very easily drop to 10 henries or less with, current which does not tax the capacity of th wire. Good chokes are made with air-gaps at some point in the core. This reduces magnetic saturs. tion of the core, and at the same time reduces the inductance of the choke, but under load cond. tions it is quite possible that the inductance wi be higher with a choke which has an air-gap o proper size than would be the case with a choke of much higher ‘“‘a.c. inductance” with no air-gap This point should be kept in mind in selecting manufactured choke, or in building one at home The design of filter chokes of different indue tance values for almost any conceivable type of amateur transmitter is well covered in the Hand. book. Tables are given showing the proper cor size, size and number of turns of wire, air gaps, inductance and other factors which enter into the construction of a choke FILTER CONDENSERS Aside from tubes, there is probably no other item in an amateur transmitter which requires more frequent replacement than the filter con- denser. This is not usually the fault of the con- denser manufacturer, but is more often caused by the failure of the amateur himself to take into account the conditions under which the con- denser must work. After much confusion among manufacturers condenser ratings, the practice has been gener- ally adopted of rating them at the maximum de working voltage. This, it must be understood, is not the a.c. effective voltage supplied by a trans- former. As mentioned above in connection with mercury-vapor rectifying tubes, the peak trans former voltage will be 1.41 times the rated volt- age, provided the wave form is of sine shape. It often happens that the wave form is considerably distorted by the time a transformer at the end of a long line is reached, and the peak may very readily be higher than this value. A fairly good working rule to follow is that the filter condensers should be rated to stand at least 50 per cent more voltage than the transformer secondary supplies In the case of a full-wave rectifier working from a center-tapped transformer winding, only the voltage on each side of the center-tap is con- sidered, because so far as the filter condensers are concerned, the two halves of the transformer are in parallel. As an example, a filter condenser to work with a transformer giving 500 volts each side of the center-tap should be rated to stand 1.5 time 550, or 825 volts. The standard safe voltage rat- ing nearest to this is 1000, and 1000-volt con densers are therefore the size to use. Similarly 4 transformer giving 1500 volts each side of the cet ter-tap would require condensers rated at 2290 volts, and a 2000-volt transformer will necessitate the use of 3000-volt condensers. ere ele ths col hig pre ove ers vi ) der OWT in i witl Ba

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E, 193%) S with y of the at some > Satura- luces the d condi- ince will r-gap of choke of alr-gap lecting 4 it home t induce type of e Hand. per core ulr gaps, into the 10 other requires ter Ccon- the con- used by ike into he con- ct urers 1 gener- um de ‘tood, is a trans- on with k trans ed volt- hape. It derably e end of ay very ly good idensers nt more upplies ng from nly the is con- idensers sformet rk with > of the 5 times age rat- It con- ilarly 8 the cet- at 2250 essitate JunE, 1930 Failure to observe this rule in buying filter condensers is almost sure to result in very short condenser life. It is therefore well to invest a little more money in adequately-rated condensers in the beginning and obviate the necessity for re- placement later on. There are two types of condensers now gen- erally available, electrolytic (d.c. only) and paper a.c. or d.c.). For d.c. voltages of 1000 or less, the electrolytic condensers are cheaper per microfarad than the paper type. However, since electrolytic condensers are not made to stand voltages much higher than 500 per unit, it is necessary to use the proper number of them in series for higher volt- ages, so that the difference in cost for voltages over 1000 is a negligible consideration. The leakage current with electrolytic condens- ers is much higher than is the case with good paper condensers; but on the other hand, if the voltage rating is exceeded, the electrolytic con- densers will not puncture, but simply allow more leakage current to pass. The usefulness of the con- denser is not impaired, although the capacity drops off rapidly as the rated voltage is exceeded With paper condensers, the punctured section is useless and must be replaced by a new one. The method of using electrolytic condensers with high voltage rectifiers has been covered in an article in the March 1930 issue of QST’. It is rec- ommended that those interested in using this type of condenser read it carefully DESIGNING THE FILTER The filter which is theoretically correct for the particular case in mind may not always be the the most desirable from a practical standpoint This is usually true when a filter for a transmitter is being considered, because the filter has other functions to perform in addition to its primary purpose of smoothing out the ripple — such as maintaining the voltage at a high level, improving regulation, and others; and in addition must be designed so that it will not do certain things, such as introducing chirps or other keying diffi- culties An excellent article. on this subject, ‘The ABC of Filter Design” appeared in the April, 1930, issue of (ST. Anyone with an elementary knowledge of algebra can read this article intelli- gntly and apply the principles set forth to his own individual case. The equations that appear init should not “scare off’’ the ordinary reader without engineering education — the language sas simple and non-technical as it can possibly be made, and the information is very much worth-while. This article furnished the basis for nost of the discussion below. A plate-supply smoothing filter falls in the dassification known as “low-pass” filters, in which the object is to attenuate (weaken) all frequencies higher than the highest frequency to be passed, known as the “cut-off” frequency. OST 13 The cut-off frequency in the case of a smoothing filter is zero, since only direct current is wanted. However, the design of a filter with zero cut-off is impractical and would require an almost un- limited amount of apparatus; and for practical purposes is unnecessary. The most satisfactory way of attacking the problem, as pointed out in the article mentioned above, is to build a filter with as low a cut-off point as economic considera- tions, consistent with adequate filtering, will allow. Before going any farther with this discussion, however, it is necessary to set up some sort of definition of the word ‘‘adequate”’ as applied to a filter. We can say without any qualification that = -CONNECTIONS USED WITH A TYPE '80 TUBE the adequacy of the filter depends entirely on the transmitter and how it is adjusted. A filter which will be adequate on a crystal-controlled set is far from sufficient on a 1927 transmitter, and even a good outfit can be spoiled by poor adjustment. The answer to this is simply how much the trans- mitter frequency changes for a given change in plate voltage, because changes in the plate voltage at the supply voltage frequency — in other words, ripple — cause the transmitter frequency to vary at the same rate, giving rise to wobbulation and the well-known mushy and ragged r.a.c. notes so prevalent nowadays. The smaller this change, the smaller will be the filter necessary for a given quality of note, and at the same time there is less difficulty with keying chirps and clicks. A great many of the rough notes we hear on the air could be changed to d.c. or something very close to d.c. by a few simple alterations in the transmitter itself and a little intelligence in adjusting it, with- out a single change in the rectifier and filter. The antenna current may drop off a little — but actual tests will show a difference in antenna current of as much as 25°) or more makes very little difference in signal strength at the receiving end. As a preliminary to building or changing a filter, the article in August, 1928, QS7' on “Overhauling the Transmitter for 1929,” and Chapter VI in the Handbook, should be carefully read The theoretical design of filters is based on the assumption that the characteristic impedance of the filter is equal to the impedance of the output circuit and the impedance of the input circuit. The input and output impedances must therefore

Page 12

= = <= a condition not often realized in tice. However, this is not as detri- th a plate-supply filter as it would be er designed for other purposes where the ts are more exact. The general effect natching of impedances is to attenu- iencies more than would otherwise —which is exactly what we want tion filter is more suitable for plate than the T-section. This is so be- placing of the condensers is such that lation is better, and the voltage out-

LULL

7 —

To fi/ter (——— + \ | O:/ Level L i ! i = T , Rectifier a 50V Sov ~ /nsulation (79) unportant 10V. CIRCUIT FOR MERCURY-ARC RECTIFIER eep-alive circuit are also s/ n, than would be the case with a T- Having decided on this type of iestion to be settled is how much how much inductance will be re- ive adequate smoothing. About the to the use of zsections would be in rectifier using mercury-vapor tubes lesired to draw more current than be taken from a system with the t to the rectifier, and when the drop ge caused by placing a choke next to in be neglected. on page 35 of April QST give us a OST

JUNE, 1930

clue to the amount of filter necessary. It will be seen by comparing the two drawings that there is no particular advantage in increasing the atteny- ation constant, a, beyond 5, because at that point the a.c. power passing through the filter is less than 10% of the original amount, and a further increase in a makes very little difference in the result. Experience shows us that, when using a transmitter adjusted so that the frequency changes very little with changes in plate voltage, the note with a filter having such an attenuation constant will be ‘‘pure d.c.’’ The problem, there- fore, is to build a filter of that type. The output of a rectifier may be considered as being a steady direct current on which is super- imposed an alternating current. The frequency of the superimposed alternating current may be either that of the supply line or twice that figure, depending on whether the rectification is half- wave or full-wave. A cut-off frequency lower than this frequency must be chosen in order that the input frequency and its harmonics will be sup- pressed. The lower the cut-off frequency chosen, the greater will be the attenuation of the ripple input frequency; also the larger the number of sections in the filter the greater will be the attenu- ation. An inspection of the equations on page 335, April QST, shows that the higher the allowable cut-off frequency, the less will be the amount of both inductance and capacity required. As an example, if we assume a cut-off of 40 cycles to be sufficient for a half-wave rectifier working from a 60-cycle supply line, an 80-cycle cut-off will result in the same attenuation of a 120-cycle input frequency. The input frequency from a full-wave rectifier on 60-cycle supply is 120 cycles, and the advantage of a full-wave rectifier becomes imme- diately apparent, because only half as much in- ductance and capacity will be required to give the same degree of filtering. An even smaller filter will be sufficient with a d.c. generator, be- cause the ripple frequency is usually much higher than 120 cycles. The equation for ripple frequency is R.P.M. * No. of segments 60 so that a generator with 40 segments running at 3600 r.p.m. will have a ripple frequency of 2400 cycles — and in addition the actual ripple voltage will be only a small fraction of that from a recti- fier. Some different filter combinations and the at- tentuation constant for each are given in Fig. 7. These are based on full-wave 60-cycle rectifica- tion, and the input and output impedances are assumed to be matched to the filter impedance. An impedance of 400 ohms was chosen, as this represents fairly well the plate impedance of most of the transmitting tubes used by amateurs with

Page 13

, 1930 will be there is attenu- it point is less further in the using a quency roltage, uation , there- ered as super- ency of ay be figure, is half- er than hat the e sup- chosen, » ripple iber of attenu- ge 35, owable punt of As an 's to be from a ] result » input ll-wave ind the imme- uch in- Lo give smaller or, be- much ripple ning at yf 2400 voltage a recti- the at- Fig. 7. ctifica- ces are dance as this »f most rs with June, 1930 the exception of the Type ’52. The “brute force” filter shown at (a) is not exactly correct for any tube, as the characteristic impedance is 2800 ohms. The attenuation constant in this case is based on correct matching. It will be noticed from the equations referred to above that, al- though for a given cut-off frequency the product of inductance and capacity will be the same for any load impedance, the relative amount of each element changes with the load. The higher the load impedance, the greater will be the ratio of inductance to capacity, and vice versa The plate impedance of a tube is a variable quantity, and in general is equal to the plate voltage multiplied by the plate current divided by 2. A change in the adjustment of the trans- mitter which causes the plate current to vary also changes the plate impedance. For this reason the mathematics of filter design cannot be applied too strictly to a plate-supply filter problem — the load impedance is likely to vary within rather wide limits with individual transmitters even though the same kind of tube may be used Basing conclusions on the data given in Fig 7, it might appear that either (c) or (e) would be the best type of filter to use. Theoretically this may be so, but in practical work other considera- tions are bound to influence the design Actual tests on plate supply filters such as are used in B eliminators, which usually consist of two 7 sections, (such as (c) in Fig. 7, but with different condenser values) indicate that the first condenser — the one next to the rectifier — has the greatest effect on the d.c. voltage output and regulation. In general, the larger this capacity, the higher will be the output voltage and the better will be the regulation, but there seems to be no particular advantage in increasing the capacity beyond 2yfd.2 The second filter con- denser has less effect on the voltage and regula- tion, but has a very noticeable influence on the ripple, and the larger its capacity the less will be the ripple voltage passed through. Here again, tests indicate that there is no important ad- vantage gained by using a capacity larger than 2 to 4ufd. The chief function of the last condenser seems to be to act as a reservoir to supply mo- mentarily large demands on the plate supply system, and the larger its capacity the better will be the tone quality of a receiver plate supply, or modulation in the case of a ‘phone transmitter supply. For c.w. work this is a comparatively minor consideration, and the 8 or more ufd ordinarily used for audio-frequency work can be reduced to 2 ufd. or less without any deleterious effect. These tests were based on full-wave recti- ? These tests were described in a series of articles in QST during 1927-8. The papers in question are marked with asterisks in the bibliography at the end of the present article Ost 15 fication with 60-cycle supply, and would require some modification for lower frequencies. It should be understood, however, that the various con- densers do not have clean-cut distinctions in their functions, but that these functions are more or less intermingled, and a change in any part of the filter will affect all three. A little consideration of the above facts leads us to believe that the old “brute-force’’ filter is still a pretty fair arrangement for general amateur work. Actual experience with it shows that it is capable of giving excellent results if the trans- mitter is adjusted in 1929 fashion. There is no doubt, however, but that it can be improved upon if found necessary. We are almost tempted » & : —. 4 = . tah — al — —E EE > os TT + -—e T = = mess ‘ | (mtd _ 2 EEE ome mt Oe Tae gee lee cel ate — a 26 94 == = = whe |2ats wd i 4 in che we RRR RA ARLE | => hd ~—= . = 3746 | \° 4 EE FIG. 7? to say that if the transmitter will not give a d.c. note with a filter of this type and full-wave 60- cycle rectification, there is something wrong with the set itself, although there may be circum- stances, particularly on the higher frequency bands, which make a larger filter necessary. A two-section filter is preferable to a single- section, even though the same total amount of inductance and capacity are used in both cases. The reason for this is that the attenuation con- stant with two sections is twice that of one, pro- vided both sections are alike, and in addition each added section helps to alleviate the effects of poor matching of impedance. We therefore reach the conclusion that for best filtering it is well to use two chokes and three condensers. On the other hand, the wire used in chokes is not free from resistance, and since quite a lot of wire is re- quired to make a high-inductance coil, it is possi- ble that the voltage will drop appreciably. This results in lower voltage for the tube and is harm-

Page 14

rulation, and the latter development chirpy or ‘“‘yooping”’ signal. Again ‘capacity available may be sufficient rulation and voltage in a single sec- 1 spread over two sections may not m this standpoint, although ample ring alone is concerned. ve is no limitation on the amount be used, however, and assuming es have fairly low resistance, we nend the combinations shown in rder given. Any one of the four with i transmitter, not subject to undue frequency with changes in plate ive a note of excellent character, MN TITITE 5 oma | - a Pe i on 1 al henrys (S henrys henry Ss henrys "| 2ufe |“ i 30 henrys T utd 7: utd, FIG. 8 tual filtering decreases with the rrangements. bove recommendations are on the I l-wave rectification with a supply 60 cycles. As the frequency is rrespondingly greater amount of | capacity will be required for the ng. At 50 eycles the difference is SI to be neglected, or can be made up of an extra microfarad or so in er condenser. At 25 cycles, however, unges ree filter [Fig. 8 (4)] has a natural - of 29 eycles. In other words, a filt type will have no effect whatever on half-wave 25-cycle rectifier so far ental frequency is concerned, al- t irse the harmonics will be sup- Ost JUNE, 1930 pressed. However, in a practical filter there will probably be some attenuation at 25 cycles simply because the input, filter and load impedances are very rarely matched correctly. Even arrangement (1) in Fig. 9 would be of comparatively little value, except for this same effect of poor matching of impedances. In order to get as much filtering as would be accomplished by the brute force filter with a 60-cycle half-wave rectifier, about 10 wd of capacity and 75 henrys of inductance would be necessary. A half-wave 25-cycle rectifier would therefore seem to be a rather expensive proposi- tion. With a full-wave rectifier, however, the brute- force filter will have an attenuation constant of 2.27, as compared with 2.7 with a half-wave 60- cycle rectifier. With two sections — (1) in Fig S—e increases to 4.54, slightly better than a single section with full-wave 60-cycle rectification As this represents about the least amount of filter which will give a good note with a well-adjusted transmitter, it would seem that our friends who are afflicted with 25-cycle ‘‘juice”’ are in a corner where there is not much to be done except get plenty of filter condensers and chokes. Under certain conditions it may be possible to do very well with less filter than this — these figures are of necessity based largely on theoretical consider- ations, and the final authority in all cases will have to be the monitor. And this is equally true regardless of the supply frequency. The basis of comparison is not the number of filter chokes or condensers which may be hooked in the circuit. Final judgment will be rendered on what the thing sounds like. With the aid of the monitor and the QST’s which covered 1929 transmitter adjustment it may be possible to do much with little. BIBLIOGRAPHY OF QST ARTICLES Alternating Current Rectification Applied to Radio, Part 1, page 33, April, ’29. An Unusual Rectifier Cure, page 49, November 28. Electrolytic Rectifiers, Exp. Section, November 28. The Duriron-Duralumin Electrolytic Rectifier, page 45, October ‘28. Simple Cure for an Old Ailment, page 44, De- cember °27. Successful Electrolytic Rectifiers, page 33, May ’27. Concerning Electrolytic Rectifiers, page 48, April ’26. Aluminum Rectifiers, page 51, September '25. Rectifiers, Thermionic Alternating Current Rectification as Applied to Radio, page 33, April '29. Power Supply for the Low-Power Transmitter, page 23, February °30 (Continued on page 78)

Page 15

, 1930 re will simply ces are zement y little itching tering e filter 10 sad vuld be would roposi- brute- ant of ve 6(- n Fig han a -ation f filter justed s who porner pt get Under ) very es are sider- s will f the is not which ‘ment | like which ay be d to mber mber ‘ifier, De- d to tter, June, 1930 OST The Band-Box Superhet 17 Converting the Old D.C. Broadcast Receiver to a Modern High-Frequency Superheterodyne T is generally conceded that there is no re- ceiver like the superhet for sensitivity and selectivity at amateur frequencies — par- ticularly where high-frequency ‘phone re- ception is concerned. The chief handicaps generally conceded popular adoption of this type of receiver have been high cost and addition to these handicaps, tricky adjustment of oscillator coupling and tedious manipu- lation of oscillator and first detector tun- ing circuits have been discouraging features of most high-fre- quency superhets. Here is a real high frequency superheter- odyne receiver, how- ever, which practi- cally whips all these disadvantages. Low and simplified construction are ob- cost tained by using an obsolete broadcast receiver as the foundation and a space-charge first de- tector, with resistance coupling between it and the oscillator, eliminates most of the difficulty in getting these two units working together without mutual detuning effects at even the highest amateur grid amplifier. Nowadays most everyone is familiar The by-pass cor with the general working of super- heterodyne type receivers, particularly the high intermediate frequency variety. Since it is the intention that this article be primarily a how-to-do-it affair rather than a dissertation on the theory of superhets, the how-and-why omitted. It will be * W1BVS, 28 Maple, Torrington, Conn. frequencies. 1550 ke. intermediate frequency used precludes all possibilities of ‘‘repeat’”’ points. The tuning is truly “‘single spot”’ —all the way up to 21,000 ke. The general design is based on the circuit of L. W. Hatry’s HY-7 superhet which also uses a space-charge first de- tector and 1550-ke. intermediate screen- By Howard F. Anderson* also QST — particularly in which have retarded the \ll-Purpose 1929 involved construction. In THE PANEL ISN'T CLUTTERED UP WITH A LOT OF CONTROLS The dial at the left is for detector tuning and that at the right is for oscillator tuning. The right-hand tch is the filament circuit and the one at the left controls oscillatior oj the second detector. The knob in the center is for volume control however, for the builder to review the theoreti- cal aspect of this type of receiver before start- ing actual construction; a wealth of information on the subject. will be found in past issues of Ross March, 1929, and L. W. Hatry’s “ Improving the Superheterodyne” in Hull’s article in September, The general scheme in this particular superhet is to use the old broadcast receiver’s rf. inductances as the intermediate fre- quency coupling coils with a few turns re- moved from each coil to raise the upper fre- quency limit to 1550 ke. They are tuned by the “‘neutralizing” condensers of the broadcast receiver. A high-frequency oscil- lator and first detec- tor are added, of course, and the detector of the B.C. set becomes the second detector of the super — the audio am- Moreover, the THE densers and resistors are ring. The idea the parts are placed wherever convenient. might be a good idea, UNDERSIDE OF THE SUBPANEL mostly held in place by the s to make the connections as short and direct as possible , plifier being left ‘as is.” This conversion method can be practiced on almost any tuned r-f. broad- cast receiver possessing individually shielded in- ductances. The dope here will apply specifically to only the old Crosley Bandbox d.c. set, how- ever, and similar treatment for other sets can be

Page 16

OST JUNE, 1930 the same plan by the individual Li> ( ~~} — ODO nt a $ lar | +/| | L| | a | — lal 44 N. £ \ Th * . since the receiver is obsolete. Take off the dials, escutcheon plate and the four screws on the bot- , 7 luctance. See table and Fig ce. See table and Fig y coils. See text. mad detector. See text. midget fired condensers. yet condenser. Oscillator tuning et condenser. First detector tuning eplir ondensers cond detector ler ION AND RECONSTRUCTION t local dealer a Crosley Bandbox Chis will cost from $5.00 to $10.00, dealers might give them away TERMEDIATE FREQUENCY COILS lenser is mounted on the top of the coil i to one terminal of this condenser is f the ca hen the latter put in place ér is connected to the top FIG. 1 THE COMPLETE CIRCUIT OF THE BANDBOX SUPERUET Ry — 500,000-ohm potentiometer. First detector bias control. Rs — 2000-ohm Electrad flexible resistor Re — 100,000-ohm fixed grid-leak type resistor R; — 3-megohm grid leaks. Rs — 5-megohm grid leak, second detector Ry — 10,000-ohm grid-leak type resistor. Oscillator coupling *‘Grounds"’ indicate connections to chassi The foll »wing additional parts are also re yuire i: 17” 218" x3 16" Bakelite panel 2 Vernier dials ? 5-prong sockets for coils 1 4-prong socket for oscillator tube 1 Broadcast-band radio frequer 3 Gridleak mountings 2 Toggle itches 15 Silver-Marshall 130-P or simila l forn for oscillator tnd first detector induct tom that hold the box on. Now remove the bot- tom plate. With this done, disassemble the three tuning condensers and the dial arrangement and take off the switch and rheostat. These parts will be of no more use. Turn the set over and take off all leads going to the r.f. coils as well as the plate and grid leads to the r.f. tubes. Leave the audio end alone and leave the grid condenser and leak in place. Be sure to save all screws and nuts because they will be needed The foundation kit for the superhet is the re- sult of this process and with the disassembling done, assembly of the new receiver can be started. There are four neutralizing condensers in this set. Take out the one next to the detector since it will not be used. Unfasten the next two and tum them around so that the lugs face toward the rear of the set but leave the fourth one in position These condensers are to be the tuning condensers for the i.f. transformers Remove the cans from the r.f. coils and then remove the coils by loosening the nuts beneath the sub-panel which hold them in place. Take the plate coils out of them all and rewind one of

Page 17

, 1930 e dials, he bot- > Qa »scrllator 1e bot- » three nt and ts will going 1 leads 1e and ce Be they he re- nbling an be in this ince it d turn 1 rear sition ensers 1 then ‘neath ke the yne of JunE, 1930 OST 19 these plate coils with ten turns of No. 30 d.s.c. terminal. Now take the 1-ohm fixed resistance, wire, being sure to wind in the same direction as__‘-R,, and solder it in place of the old resistance. the winding on the r-f. coil. This rewound coil is Take a tap off R; near its center and connect to the tickler for the second detector. The other one end of the common filament lead. This will two plate coils will not be used. give between .6 and .7 ohms. Mount the three It will be found that the r.f. coils each have _15-ohm resistors between the negative filament of 106 turns of wire and 20 turns should be removed _ the three screen grid tube sockets and the chassis. from the bottom end of each one. The tickler should be put in the detector coil before it is replaced in the set. The two grid coupling condensers for the i.f. tubes are mounted on top of the coils with the lugs bent over the coil form and a drop of Duco cement put on each to hold them in place as shown in the illustration. Leave the cans off until the wiring is finished; it will be a lot more convenient. Now the two 50uufd. Pilot tuning con- densers for detector and oscillator can be mounted. They go in the outside holes where the old tuning condensers were, THE LAYOUT OF THE BASEBOARD with some %¢’’ washers to take up the The knob just to the left of the center is the bias control for the first de- extra space. Be sure the first detector ‘ctor The socket immediately to its left is that of the first detector and the ‘ P > . two to its right are for the oscillator tube and oscillator inductance, respec- tuning condenser is insulated from the 1, starting at the lower left, the other tube sockets are: First detector, chassis as this has the bias voltage for first i.f., second i.f., second detector, first audio and second audio. The i.f. the first detector on it. A paper washer — ceils ans Oe de the three large cans and the audio transformers in the on each side will fix this. » "ies aan shafts connect the tuning condensers and the volume- Mount the 100,000-ohm potentiome- Qo n 4-01 potentiometer to the panel controls. ter in the center hole and use washers to insulate this too. Mount the detector coil socket, the oscillator tub socket and coil Connect the other filament terminals on all socket according to the diagram. The 500,000- the other tube sockets, including the oscillator ohm potentiometer is mounted on its bracket tube, to the chassis. Connect the black wire in the cable to the chassis. This is ‘‘— A,” ‘| “—B” and “—C,” The wire, which goes to all sockets, is connected to one end of R; and is the positive lead. The other lead from the resistance and the yellow lead in the cable go to the filament switch on the panel. Now proceed to the grid and plate leads on the first detector and i.f. am- plifier. First of all, connect the neutral- izing condensers to the r.f. coils. Of the four 2000-ohm flexible resistors, two should be connected in the screen grid supply circuits and two in the plate supply circuits of the if. tubes. These MOST ALL THE APPARATUS IS LEFT IN ITS ORIGINAL > ; ARRANGEMENT act as r.f. chokes. The first detector and intermediate amplifier at the right side and the lhe grid leaks come out on top of the second detector and audio amplifier at the left. cans and grid-leak leads go down through the center of r.f. coils. with proper insulation and fixed to the sub-panel. The photos illustrate how the by-pass condens- ers are mounted and every ham will have his own NOW FOR THE WIRING idea about laying out the apparatus below the The filament circuit is wired first. Remove the _ base. It should be remembered, however, that the resistance wound on the terminal block from plate leads on the first and second i.f. and first which there is a wire going around to all sockets; detector tubes are shielded. disconnect the wire from the terminal block and The second switch on the panel is the regenera- connect a lead from it to one oscillator filament tion and oscillator control for the second de-

Page 18

one 150- and one 250-uufd. fixed ries in the plate lead of the second regeneration the switch is open » condensers in series and for c.w losed, which shorts the .00015-ufd allows the second detector to ilso possible to get regeneration hae ISCILLATOR COIL ED DETECTOR COiu 1RRANGEMENT OF THE SON THE COIL FORMS yrid coil For t/ “re- ‘ ( and “G"" ir he t onde ro to th l sockets a j i? yn by changing the ‘67 volt r “110 volt plus” and turning control so that the sereen grid ough to stop oscillation. This ip the signals +h to say about the panel. There ontrols, the oscillator and first illator really needs a vernier dial loes not necessarily need one as it all. The center knob is the tiometer which is the volume toggle switches are for the fila- ss w. control es the “U Itrady ne Modulator” illator and first detector. This best of all and does not need ls which cause lots of trouble by ining, especially on the higher llator and first detector coils yperation of the super is to have ‘tioned correctly been made to limit the tuning Ost JUNE, 1930 TABLE OF COIL DATA First Derecror Corts Coil | No. Turns \ pprox :. Freq Remarks No. | a7 |_|No To Range, Ke Tap on Ll, l 5 gy 50 | 1840-2740 Not tapped. 2 | 3 33 2875-445) Not tapped 3 2 19 | 4425-6750 Not tapped 4 2 | 13 | 5709-8950 Not tapped 5 2 il 9309-11, L109 Tapped 5 turns from filament end 6 2 8 | 10,250-13,600 [Tapped 5 turns from filament end 7 2 s 12,450-14,225 |Tapped 3 turns from filament end SN 2 6 13,500—17,1090 lapped 2!5 turns from filament | end 9 2 3 | 17,499-21,000 | Not tapped OscrtLLaTor CoILs No. Turns Turns . |p Det Coils Coil ithe Approx. Freq Tapped with No Range, K« m: which | Ls la on I Used — a —| —_——_ 1 | 31 13 3000—4400 None | land3 2 |1s 9 4375-6250 | None | 2and4 g3isfi 7 10,590-11,700 | ! | 3dand7 “> 6 8700-11,200 | 7 6 5 14 { 14,900-16,000 | 23¢ | 8 6 | 2% 234 | 19,400-21,000 | None ’ No. 30 d.s.c. wire is used for L; and L, on all coils and for 1. and L; on No. 1 detector and os- cillator coils. J and L; on all other coils are wound with No. 22 d.s.c. wire ranges of these coils to 1500-ke. each so as not to have any repeats on the oscillator. A few of them do run over but not badly enough to jumble up everything A station heard around 0 to 5 may come in again around 95 to 100 on the oscillator dial, but is very difficult to hold fast to a 1500-ke. range in the high frequency and since to do so would re- quire too many coils to cover the necessary bands The detector and oscillator coils have only two windings each but are wound on S-M 130-P coil forms so that a tap could be taken off from the grid coils to give band spreading in the amateur bands. The table gives the number of turns and approximate range of each coil. Of course others can make coils to suit themselves always remem- bering to figure on a 1550-ke. difference in tuning range between detector and oscillator coils THE FINAL ADJUSTMENT After you have the set finished and wired, connect a pair of ‘phones to the speaker terminals to check up the set. Be careful and don't clamp them on your ears tightly because this set has some kick. Then turn on a vacuum cleaner, hair dryer or some other local QRM maker to furnish a signal for balancing up the i.f. circuits. Make & (Continued on page 8

Page 19

1930 — rks ils 2 ed ad ad od > turns lament >» turns lament turns lament 2 turns lament yn all id 0s- s are ot to them le up 1e in , but ge in d re- nds two coil n the iteur and hers 1em- ning red, nals amp has hair nish ce & June, 1930 OST 21 Advanced Transmitter Design Getting 3500-kc. Performance from the 28-mc. Transmitter By James J. Lamb, Technical Editor T is often puzzling to find that the perfectly reliable old 3500-ke. transmitter becomes not so reliable at 7 me. or that it sometimes becomes wildly erratic at 14 me. and al- together refuses to work at 28 mc., even though the orthodox changes have been made in the radio-frequency tank circuits and chokes to transmitter which was born of our trials and tribulations. SOME TRANSMITTER TROUBLES — AND THEIR SOURCES It is rather difficult to determine just where to dive into a discussion of the sources of 28-mce. THE PUSH-PULL TRANSMITTER WHICH SOLVED THE DIFFICULTIES It uses two Type "52 tubes and delivers d.c. s qnals at The tuned-grid circuit is to the right of the tubes and the wall insulators on which the two sections of the antenna coupling induc- is supported by brass strips bolted to the e are mounted. Filament- and plate-supply connections as well as 28 me. tuned plate cir to their left. The antenna ammeter the key-jack are on a terminal strip at the back. The antenna system connects to the two wall insulators at the extreme left of the asse mbly. adapt it to these higher frequencies. Almost invariably the note gets rougher as the frequency goes up, creeping becomes a major problem and efficiency goes all to pot. Condensers break down, r.f. chokes burn up, the key sparks violently — and the perspiring ham is likely to come to the conclusion that this 28-me. business isn’t all that it has been cracked up. Now the fault isn’t that of the 28-me. band as such nor does it lie in the transmitter which was well designed for 3500 or 7000 ke. but never intended for higher frequencies. The circuit diagram for a 28-me. transmitter may look exactly like the circuit diagram for a 3500-ke. rig, but the assembly of the 28-mce. set involves considerations which do not enter into the make-up of trans- mitters for the lower frequencies at all. It is these considerations which are responsible for the evolution of this particular article as well as for a lot of preliminary circuit-sleuthing and experi- menting on the part of QST’s technical gang. We shall start off with a short recital of what we found ourselves up against and then describe the transmitter troubles, since they are of so many different species and a lot of them are hard to isolate. All the usual ‘‘ bugs’’ can be grouped into a few classes, however, with the symptoms of the difficulties as a basis for classification. That the discussion may be intelligible in a practical way, we shall take a specific circuit and tear it to pieces. The selection of the circuit is not so important but let it be one that is of a popular breed. Also, it had best be one most aptly subject to every conceivable variety of “bug” a high- frequency transmitter can have. Personal ex- perience points to the old reliable tuned-grid tuned-plate of Fig. 1. Wait a minute, you t.g.t.p. enthusiasts — no intended reflection on the circuit. It’s one of the best, and before we get through it’s going to be better yet! The word-description of the rig is ‘two tubes in parallel in a high-C t.g.t.p. circuit with shunt d.c. feed to the grids and plates.’’ It has every- thing in it but the kitchen stove and almost every part has trouble-making potentialities, not only at 28 me. but at any ham frequency. Recol-

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ust headaches with just this sort of rs it all back like a bad dream. thing that can happen to any trans- course, complete refusal to oscillate, it be taking enough plate power to he bearings in the light company’s immediate conclusion is, naturally, und plate circuits are out of tune. ne them around a bit. Still no de- ition, and the plates getting whiter Che grid leak must be open — no, It was just tested and is still OK. » dc. milliammeter cut in series rid return shows some grid current leaks are even getting warm! ust be oscillating or there couldn't urrent. And oscillating they are, frequency to which the tank cir- tuned. It’s a parasitic oscillation and is determined by one or both of the circuit shown in Fig. 2. ASITIC OSCILLATIONS rve two perfectly legitimate tuned- te circuits, one with just the grid- king condensers in series with loops SMITTER OF THIS TYPE CAN BE GS iT HIGH FREQUENCIES wrtunities for parasitic and spurious wiring forming a series push-pull the other with the tuning condens- loop and the tubes in parallel. If oth) of these series-tuned circuits to hit a resonance condition, re- r successful oscillation are satisfied respective circuits are concerned) do oscillate, usually at some fre- order of 60 m.c. or so. Of course ill off at such frequencies, and the errible. The note, as heard on a is like a power leak. evidence that conditions are not so netimes happens that the filaments when the key is closed. This is a indication that there is a lot of r.f. the filaments and an early end ay be expected if the punishment he explanation for this apparent in- OST JUNE, 1930 crease in filament current may be traced to sey- eral possible causes but the most likely is that the filaments are acting as closed absorption loops approximately resonant to the frequency of os- cillation. We shall have more to say about that particular trouble later. The most obvious method of curing the para- sitic oscillation resulting from the series-tuned push-pull grid and plate circuits is to detune one of the circuits. This can be accomplished by in- creasing the series inductance on either the grid or plate end and a few turns connected at the points marked “ X”’ in the diagram of Fig. 2 may serve the purpose. That doesn’t help any in cur- ing the parasitic oscillation of the circuit elements in series with the tuning condensers, however, al- though a little series inductance might help if connected in the. grid portion at ‘Y.’’ This is only temporizing to make the best of a bad situa- tion, however, and the final recommendations are to be more sound in nature than such resorts to expediency. A few other possibilities for parasitic oscilla- tory circuits are shown in Fig. 3. These are more or less remotely dangerous, but their liability is nevertheless worthy of consideration. Analysis of their potentialities for causing trouble is con- siderably involved because the networks are so mazily inter-dependent, but a few of the more simple combinations should be mentioned. The circuit elements of Fig. 1 have been rear- ranged a little in Fig. 3 in order that their trouble- making functions may be easier to point out. Since the tuning condensers are effectively in series with the blocking condensers across the chokes in the plate circuit and across the chokes and leaks in series in the grid circuit, they are shown thus in Fig. 2. This is obviously bad busi- ness, because the tuning condensers are intended to tune the plate and grid inductances and not the chokes. The grid chokes have the leaks in series with them, of course, but leaks are not pure re- sistances and usually have some distributed capacitance and inductance in addition to the resistance specified on their labels. This dis- tributed capacitance and inductance is negligible at lower frequencies but may become consider- able at 28 mce., at least sufficiently considerable to warrant a little suspicion as to the effects on transmitter performance. Like the resistors, the chokes also have some distributed capacitance (in addition to their in- tended inductance) although this distributed capacitance is small compared to the circuit ¢a- pacitance in shunt. As a further complication, the fixed blocking condensers possess inductance as well as capacitance — particularly if the con- densers happen to be of the wound type. We know of one classic case in which a moulded fixed condenser had sufficient inductance to make it 4 resonant circuit at approximately 10 mce., with the consequence that it burned itself up while

Page 21

2, 1930 to sey- that the n loops y of os ut that 1€ para- s-tuned une one | by in- she grid at the . 2 may in cur- lements ver, al- help if This is d situa- ons are orts to oscilla- ‘e more vility is nalysis is con- are so e more n rear- rouble- ut. vely in SS the chokes ey are d busi- tended 10t the series ure re- ibuted to the Ss dis- ligible isider- erable cts on some ‘ir in- buted lit Ca- nm, the 1ce as con- know fixed e ita with while JuNE, 1930 being used as a by-pass condenser across a meter in a tuned r.f. circuit. Perhaps the explanation for the mysterious blowing of many filament by- pass condensers — as well as grid- and plate- blocking condensers can be attributed to “‘in- ductive”’ fixed condensers. It would seem that enough evidence already had been collected against our old reliable circuit to condemn it entirely, but we aren’t through yet. We haven't considered the tube characteristics and capacitances yet; we can’t start redesigning the set until a decision has been made on the tubes to be used and the method of connecting them. With the tubes connected in parallel, the re- spective grid-filament capacities are in parallel and so are the plate-filament capacities, as well as the grid-plate capacities. Since the evils of such combinations have been explained quite com- pletely in the article, ‘‘ Push-Pull Transmitters,” in QST for December, 1928, the whole story need not be repeated here. The conclusion is sufficient: Tubes should never be operated in parallel at high frequencies, particularly in self-excited transmitters. The choice of tubes is comparatively easy, be- cause it can be based on the specifications of the manufacturers which, in turn, are determined largely by the inter-element insulation and inter- electrode capacities of the tubes themselves. The best bets are the Type °10 for low power rigs and the Type ’52 for higher power sets. The others, such as Type '03-A, ’11, and ’04-A, have comparatively high inter-electrode capacities, as well as other features making them unsuited to ultra high-frequency service. The importance of inter-electrode capacitance and inter-element in- sulation in tubes used at ultra-high frequencies has been aptly pointed out by H. E. Mendenhall of the Vacuum Tube Research Department, Bell Telephone Laboratories.! The information is so pertinent to our problem that Mr. Mendenhall’s statement will be quoted verbatim. “There are several reasons why tubes that are structurally satisfactory for the low-frequency range were inadequate for the high-frequency range. “In the first place, at the high frequencies the inter-electrode capacity of the elements of the tube becomes very important from the circuital standpoint. The ‘charging’ or displacement cur- rents which flow through every dielectric in an alternating electric field increase with the fre- quency of the alternations. These displacement currents heat the various dielectrics whose power factors are not zero, used in and around the tube, thereby causing the ultimate failure of the tube. A ‘high’ vacuum is the only perfect dielectric, for heat is not developed in it through dielectric losses. It can fail only when leaks or a slow evo- 1 Bell Laboratories Record, October, 1929. OST 23 lution of gas from the parts of the tube change both its status as a vacuum and its insulating properties. The air separating the elements on the outside of the tube will be only about one- tenth as effective an insulator when the tube is oscillating at thirty-thousand kilocycles as com- pared with the non-oscillating condition, when the same plate potential is applied to the ter- Parasitic Circuit A FIG. 2.— CIRCUIT ELEMENTS IN WHICH PARA- SITIC OSCILLATIONS FIND SATISFACTION One is push-pull series-tuned and the other ts tubes-in- parallel series-tuned. Either is open to suspicion. minals. The same air gap will be disrupted, more- over, by one-twelfth of the applied voltage if it is alternating at thirty-thousand kilocycles instead of at sixty cycles. (Italics ours.) ‘‘ Another reason for the failure of earlier types of vacuum tubes when used in short-wave cir- cuits is to be found in the ‘skin-effect.’ A high- frequency current passing through a conductor is forced to travel through a very thin layer at the outside of the conductor. The effective size of the conductor is thus reduced, its resistance cor- respondingly increased, and overheating en- gendered.” That's the whole tube story in a nutshell. Summarized in terms directly applicable to our present problem, it means that the tubes used for 28 mec. must have the lowest possible inter- electrode capacity, the greatest possible inter- element insulation both inside the envelope and out, the highest vacuum, the least occluded gas in the elements, and grid and plate leads of adequate effective conductivity at the operating frequency. Even with tubes designed to satisfy these requirements it is advisable to operate with less than maximum rated plate voltage if normal tube life is to be obtained. Leaving out those tubes not intended for operation at ultra-high frequencies, our recommendation is that the d.c. plate voltage be limited to 350 volts for the Type ’10 tubes and to 1500 volts for Type ’52 75-watt tubes at frequencies above 28 mc. In order that the effect of inter-electrode ca- pacities on the external circuits may be reduced to the very minimum, the most practical ar- rangement is, obviously, two tubes in a push-

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Moreover, it happens that this type iptable to modifications which ly all the other weaknesses of circuit of Fig. 1. Since the in- ell Lica OST JUNE, 1930 ELIMINATING THE BUG OF PARASITICS As pointed out in the analysis of the circuit of Fig. 1, the principle sources of parasitic oscilla- THE LAYOUT OF EQUIPMENT AS SEEN FROM ABOVE taken in progressing from the nt to the final push-pull circuit make this story unnecessarily sons for the various modifica- porated in the description of the ‘ HAT DELIVERS D.C. SIGNALS AT 28 MC » the details of the construc- insmitter, a summary of its characteristics will be rly for the benefit of those who rating n f skimming through technical art vrite the Technical Information Sel r details which were given in the stor they apparently didn't bother to high-C push- feed to grids two Type '52 75-watt tubes and for operation on the 28- and re are none of the usual block- such there is one home-made er which could be omitted, as lhere are no filament by-pass r.f. chokes shown in the dia- spensed with, since they are in sake of precaution rather than tely balanced ith series d c. tionally necessary. ite-tuning condenser rotors are potential to ground. They the transmitter is in opera- of the lency to parasitic oscillation or disturbance set's | by proper proportioning and rid and plate circuit elements, wit » choking and other after- no tricky or freak features based on common, ordinary, r tions are the series elements in the grid and plate circuits. Since the possibility of parasitics is greatest when the series elements in the grid and plate circuits are in approximate resonance, the best insurance against their occurrence is to make the series elements of non-resonant pro- portions right at the start. Here is a case where short leads are important on one side and long leads are important on the other. This is one in- stance in which the time-worn recommendation, ‘all leads should be as short and direct as possi- ble,’’ must be modified. The plate leads should be short (as short as possible) but the grid leads must be long. This ratio of grid-lead length to plate-lead length is an important consideration in the de- sign of any piece of high-frequency apparatus containing one or more vacuum tubes. It isn’t necessary to have more than one tube to have parasitic oscillations, either. Many a single-tube oscillator or amplifier is ‘“‘lousy’’ with them, al- though they are not often of sufficient amplitude to make the set entirely inoperative. Single-tube tuned-grid tuned-plate rigs are particularly ad- dicted to them, especially those using a Type ‘O4-A 250-watt tube. The usual indication of parasitics in a minor degree is abnormal heating of the tube, poor efficiency, a bum note and erratic oscillation; missing dots, jumping frequency and the like. (If your set shows these symptoms, go on a parasitic hunt.) In this particular transmitter, the plate leads go directly to the plate tank-circuit tuning con- denser and each lead is 3.5 inches long. The grid tank circuit arrangement is a bit different from the usual in that the inductance is mounted be- tween the tubes and the tuning condenser. This allows sufficient length in the leads from the grids to the tuning condenser terminals without overly stringing out the assembly. The total length of each grid lead measured from the tube en- con mu ove int our

Page 23

1930 lit of cilla- | late s is and the to oTo- 1ere ong in- ion, pad tus n't ive ibe ide ibe ud- pe of ng tic nd on n- ‘id m ye- 118 ds ly of n- Jonze, 1930 OST 25 ydope to the condenser terminal —is 13.5 inches. ‘The connections within each tank circuit fhetween condenser and coil terminals) are neces- srily short, direct, and heavy. The connections within any tank circuit should always be short, of course, because it is in these circuits that large rf. currents flow and losses must be kept down to the very minimum. A little study of the various ‘“‘favorite’’ cir- wits immediately reveals that the push-pull tg.t.p. is the only one which allows a high ratio of grid-lead length to plate-lead length, since all the others require the connection of the grid and plate leads to terminals on a single t tank circuit and automatically restrict these leads to approxi- mately one length — unless some of them are mn around the block just to make them a little longer. All the other circuits have an additional condemning handicap which would eliminate thm from consideration if lead-length ratio didn’t put them out. This handicap is their re- quirement for shunt d.c. feed to either grids or plates. If series plate feed is used, a shunt d.c. grid return must be provided; if series grid feed is attempted, shunt plate-supply feed becomes auto- matically necessary. This applies to all the Hart- ley, Ultra-audion, and Colpitts circuits except THUIT -_ is me + 7] ‘ ik I, HH-- X, d Cc. == Cy Cl LE : — Rrick fe i] 2p RFC C denser 1G. 83.—GRID- AND PLATE-CIRCUIT CHOKES CAN ALSO CAUSE TROUBLE The tuning condensers are effectively in parallel with the hokes, V ic 48 resonance 18 a possvbility. those which have a blocking condenser in the center of the tank inductance — and the latter wrangement is impractical because a blocking ondenser so placed in a high-C tank circuit must carry more r.f. current than any but the most expensive condensers can handle. More- er, we are skeptical of ordinary fixed condensers i high-frequency r.f. circuits anyway, and one of our aims is to eliminate them as much as possible. tis impractical to build up a compact fixed con- denser without considerable dielectric other than ur in the electric field; losses in dielectrics other than air can be quite vicious at frequencies above 23 me., and the more common insulating ma- lenals are liable to break-down in even moderate power transmitters. This brings up the matter of blocking and by-pass condensers in general. ELIMINATING DEPENDENCE ON FIXED CONDENSERS A study of the circuit of Fig. 4 reveals that there is no fixed condenser in any r.f. portion of - THE PLATE INSULATING CONDENSER IS MADE UP FROM STATOR PLATES OF A WRECKED VARIABLE It not in a radio-frequency circuit and may be omitted if the tri.ble condenser has sufficient spacing to withstand the the circuit. Moreover, fixed condensers have been omitted where precedent would lead us to believe they ought to be. This has not been done without justification. Their omission not only is possible but is advantageous also. This applies especially to the grid-blocking condenser and filament by- pass condensers. The fixed condenser between the rotor of the plate tuning condenser and the negative high voltage is simply an insulating condenser, made necessary because the plate tuning condenser sparked over with keying surges. It has no radio- frequency potential across it and can be shorted out at reduced plate voltage. The omission of the orthodox filament by-pass condenser was decided upon after a number of tests and trials which brought out some interest- ing though puzzling results. By-pass condensers of several different sizes and types all gave poorer results than none at all. One of the original pair shorted across (apparently from a keying surge) and removal of both of them immediately re- sulted in an improved note. The substitution of others made no improvement over the first pair and caused a reduction in the quality of the sig- nal. A pair of lamps connected as a center-tapped resistor had the same effect as the various fixed condensers. Using the filament center-tap of the transformer only, however, the note is invariably ‘near d.c.’’ — the plate rectifier being two Type ‘66 tubes in a full-wave hook-up and the fil- ter consisting of 1 ufd., 30 henries and 2 ufd. in

Page 24

rute-force combination. Moreover, on r.f. at the filament terminals of the filament-supply circuit. In e first 28- or 14-mce. transmitter has been impossible to find rf. into the filament- and plate- nent as well as into the 110-volt ent- and plate-supply leads are ‘o r.f. voltage to ground. tion for the inferior performance of > when filament by-pass condensers

F 2 /eads ve NE ai. ins j Y | t. * a ~ * R » ARC; > 4} ae -_ - wT 220-—<— | = sm. RFC ~ =

RE NO FIXED CONDENSERS OR VCY CHOKES CONNECTED TO POTENTIALINTHISCIRCUIT ce. Each section has turns of Both inches in diameter enter condenser 00 pufd minimum OU pyfd fransmitting -B or General Radio Type RL-Z T ype 6-B receiving condenser O pufd f reduced pl le voltage er for key, 0012 pfd. May Bradleyleak. Fized re- / ater May be omitted but sency choke been definitely decided upon, vical conclusion so far reached is nce of the filaments in shunt nsers resulted in a pair of absorp- e the filaments are in the intense nside the tubes and could pick up Che electric fields of the respec- 180 degrees out of phase, of course, laments properly connected to- by-pass condensers, the resultant igh one should be in opposition OST

JUNE, 193) to that through the other. If the introduction ¢ by-pass condensers should upset this balance there might be a net flow of r.f. current whic “modulated” by the low-frequency a.c. through the filaments, might in turn modulate the rf output of the transmitter. This is largely speey. lation, however, and is offered for what it may be worth. It remains that with this particular rig the signal and operating stability are better without filament by-pass condensers than with them. AND SYMMETRICAL TANK ANTENN A-COU PLING CIRCUITS Although the transmitter’s plate circuit is not symmetrical with respect to the grid circuit, the plate circuit of one tube must be symmetrical with respect to the plate circuit of the other as must also be the grid circuit of one tube with respect to the grid circuit of the other. The tw grid connections to the grid tank must be of the same length and so must be the two plate con- nections to the plate tank. In addition to symmetrical connections be- tween the tubes and the respective tank circuits, the tank circuits themselves must be symmetrical about their respective electrical ‘‘centers.”’ This requirement calls for not only an exact center tap on the tank inductance but also for tuning con- densers which have symmetrical electrical prop erties. Tuning condensers of the double stator and single rotor type have this feature and such condensers are used for tuning the tank circuits in the transmitter. The two sections of such a condenser are in series across the tank circuit and the rotor is grounded. Since the rotor is at zero r.f. and de. potential to ground, the danger of shock as well as the serious detuning of the set when the dials are touched are eliminated. Moreover, the in- sulation of one section of the condenser is i series with the insulation of the other (across the high r.f. potential ends of the inductance) and the insulation is thereby made doubly effective Since the two sections are in parallel with respect to the d.c., the d.c. flash-over voltage is the same as if a single-section condenser of the same plate spacing were used. It is usually r.f. voltage rather than d.c. voltage that breaks down condenser insulation, however, and a fixed insulating con- denser between the rotor and negative high volt- age will be adequate insurance against d.c. flash- over with standard types of tuning condensers. The balanced tuning condenser is also advat- tageous in making possible the achievement of symmetrical connections within the tank circutt, since the leads between the condenser and the tank inductance both connect to the stator plates and can be made exactly equal in length. Such symmetry is difficult to obtain when one connet- tion must be made to the stator plates and the other to the rotor (frame) of the condenser.

Jun app (sin cult (be cal pat nec que bul thi mu out tor of mi the on ind ten pla cur in | oth bu

Page 25

E, 193) iction of balance t which through the rf Y specy- may be ular rig better an with PLING it is not uit, the metrical ther as be with The tw e of the ite con- ns be ‘ircuits, netrical .” This iter tay ng con- il prop- - Stator 1d such circuits are in otor 8 nd de as well e dials the in- r is i oss the e) and ective respect p same e plate rather denser g coD- h volt- - flash- 1sers. vdvan- ent of ircult, id the plates Such ynnec- 1d the Jone, 1930 The total capacity across the tank circuit is approximately half the capacity of one section (since the two sections are in series) and a con- denser of comparatively high capacity per sec- tion is necessary for high-C at the lower amateur frequencies. Since the balancing of the tank cir- cuits is not so critical at the lower frequencies The terminal strip, by-pass tubes in the neutral area of the r ulio-freque ney field, (below the 14-me. band, say) it would be practi- cable to connect a single-section condenser in parallel with the balanced condenser to get the necessary high-C plate tank for these lower fre- quencies. The effective capacity range of the re- built National plate tuning condenser used in this set is from a minimum of 28 pwyfd. to a maxi- mum of 110 wyufd., measured with the condenser out of the set. This maximum gives a satisfac- torily high-C plate tank at 28 and 14 me. with Type 52 tubes in push-pull. The capacity range of the Cardwell grid-tank condenser is from a minimum of 45 wufd. to a maximum of 275 wld., wiring and grid-filament capacities in- cluded. The centers of the tank inductance are also at ground r.f. potential and are therefore the ideal points at which to make the d.c. feed connections to the grid and plate circuits. If the plate-supply and grid-leak connections were made exactly at the electrical centers of the inductances, there would be no necessity for radio-frequency chokes at these points. As insurance against the possi- bility that these connections may not. be exactly at the voltage nodes, however, it is advisable to have r.f. chokes in the circuit as shown in the dia- gram of Fig. 4. The chokes are not functionally hecessary and if the taps are carefully placed on the inductances they may be omitted. The idea of electrical symmetry is also carried on into the antenna coupling circuit. The antenna inductance is split in two sections with the an- enna ammeter connected them. This places the ammeter at the point of maximum current (with symmetrical current distribution in the antenna or feeder system) which is advan- lageous in some ways — and disadvantageous in others. The advantages are the requirement for but one meter and the placement of the meter at & point of maximum impedance in the system. between OST 27 Radio frequency meters have a considerable amount of inherent impedance at very high fre- quencies and it is advisable to place the meter in a part of the circuit where this impedance can be least effective. The disadvantages of the ar- rangement are the necessity for two tuning con- densers and their location at points of consider- ee D.C. AND LOW-FREQUENCY A.C. WIRING IS RUN BENEATH THE FRAME condenser for key, grid-leak and r 4 chokes are grouped beneath the able r.f. potential. The latter disadvantage is principally noticeable when making tuning ad- justments, since bringing the hands near to the condensers has a considerable detuning effect on the coupling system. Weighing the advantages and disadvantages seems to favor the arrange- ment shown in Fig. 4, although modification of the whole scheme might prove profitable. Che transmitter is intended for operation with a Hertz antenna fed by a two-wire tuned feeder system (Zeppelin style) and adaptation to other systems will require revamping of the coupling arrangement. PRACTICAL CONSTRUCTION The actual how-to-make-it part of this article has been reserved for complete recital in one piece because it has been found that the practical constructional details are not so readily dug out when they are tangled up with the theory and “why’’ which must also be given in a technical article. This arrangement should particularly suit those who have the habit of reading only the constructional parts of articles — and who often miss details which are not conspicuously set apart. (We have a wistful hope that some of these theory-dodgers have unconsciously absorbed a little of their pet aversion while hunting for the constructional information in the first part of the story. The simplicity and straightforwardness char- acterizing the layout of the transmitter are graphically brought out in the illustrations. The foundation for the assembly is a skeleton frame made of ‘printers’ furniture.’ This wood is cherry impregnated with linseed oil and is ob- tainable at printers’ supply houses and at most large printing plants. It comes in 36-inch lengths with one cross-sectional dimension of approxi- mately %¢ inch and the other ranging from ap-

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¢ inch to 15¢ inches. The side-rails ter are two pieces each 36” long [he overall depth is 64”. The te-tank condensers are mounted on ts bolted to the side rails, the grid ing a Cardwell “multiple,” Type plate condenser a rebuilt National the latter having Crolite insula- condenser is a standard mul- eiving condenser and needs no idapt it to our purpose. The Na- ting condenser, originally a single- requires some remodeling to con- -section type. This is easily done, changes in the stator assembly sary. The stator is removed by tak- on the supporting rods and then he supporting Crolite insulators. completely disassembled and the in the center. Copper washers the unthreaded ends of the six the stator is reassembled with the out. The result is two separate supported by three rods held fast rs by hex nuts. In reassembling ire should be taken to get identi- tween the plates and proper align- o sections. This can be done quite ‘sighting”’’ across the plates and Vhen finally lined up, the plates ened carefully. Too much tension rods out of the washers soldered to insufficient tightening will cause contacts between adjacent stator rass bolts of the proper length, hread would be better than the f they could be obtained. ultiple-type condenser may be ing is distasteful. The Cardwell the General Radio Type 334-Z itely the same characteristics as ional used in this transmitter and ted in its place. condenser, C,, is made up from 1 plates of a National straight- eceiving condenser which had ced. These plates are stacked up th the same washers used as variable condenser of which they end plates are pieces of bakelite rting screws are 6-32 brass flat- number of plates is 8 and the yximately 75 uufd. Its breakdown is approximately 3000 volts at 60 ndenser is shown “close-up” in trations. between the various pieces of be determined with sufficient ac- ying the illustrations. The spacing lowed exactly, of course, but ad- yout in general is recommended. f OST JUNE, 1930 The grid and plate inductances are supported on General Radio wall insulators and are fas. tened in place by bolting through holes drilled ip the flattened ends of the copper tubing of whieh the coils are made. Clips are not used for making the center-tap connections to the coils but leads are permanently soldered to the inductances at their exact centers (as estimated by inspection), Most of the clips available are made of steel, FIG. THE CIRCUIT SUGGESTED FOR TYPE "10 TUBES { re the same as th F th the exrce a bm paps re , / I ner ( ( S e as ( I I h enter t wl ( five fr tor nter-tapped filament inding used, this re sfor may & omit and become very hot in the intense field about a transmitter inductance. This heating is good evi- dence of losses and we are trying to eliminate all the sources of loss. The clip is therefore put on the other end of the lead, where it will be out of the tank-inductance field. Specifications for the inductances are given under Fig. 4. The grid leak is an Allen-Bradley Type E-210 Radioleak, and is fastened to a small bakelite panel on the front rail of the frame. A variable leak is used because it has been found that ad- justable grid bias is advantageous in getting the best signal-quality and efficiency at very high frequencies. Adjustment of the grid bias is the final operation in tuning the transmitter and al though it is not extremely critical, as a tuning refinement it is well worth having. The radio-frequency chokes are designed for the 28-me. band and are all identically alike Each consists of 48 turns of No. 30 d.c.c. wir wound over a 2-inch length of wooden dowel )r inch in diameter. The method of winding is to measure off 2”’ on the form and wind 24 turns pe inch over the 2 inches, estimating the spacing # slightly more than the diameter of the wire. After the winding is completed, it should be doped with acetone or collodion to prevent the wire from slipping. Wood-serews through holes drilled ® the forms hold the chokes in place on the tran* mitter. These chokes are satisfactory at 28 me (Continued on page 80) 73 — a — | th le te ar

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E, 1930 Pported are fas. rilled in f which making ut leads inces at ection), of steel, o a FANS ([h > TYPE r may hk about a 0d evi- iminate ore put be out ons for > E-210 vakelite rariable hat ad- ing the ‘y high | is the and al- tuning red for alike c. wire wel 1 g is to rns per cing at . After “d with >» from lled in tran 28 me. June, 1930 OST 29 More Progress on 28 Megacycles Complete Description of W2JN—Asia Works U. S. A.—Prepara- tion for June Tests— Report on R.S.G.B. Tests By Clark C. Rodimon, Assistant Editor E have received the photographs and diagrams of the successful 28-mega- cycle station W2JN, owned and oper- ated by Mr. C. K. Atwater, Upper Montclair, N. J. Last month we men- tioned the records this station and other stations have set up on 28 me. The radiating system at W2JN is a Zeppelin type antenna designed to operate at best efficiency in the 14-mc. band. It is a horizontal wire 98 feet long and 30 feet high running in a N.W. by S.E. direction. It is excited at the north-westerly end by a 2-wire 48-foot transmission line which is spaced ten inches between wires. At 14,200 ke. the antenna operates at its third har- monic while the transmission line is three quarters of a wave in length. When operating on 28,400 ke. the same antenna is used but a change in the free lex of the feed line is made in order to maintain a voltage node at the antenna coil. At the point ‘“X’ The antenna location is not a particularly favorable one. It is over level ground and about 200 feet above sea level. From the house a view of New York City sky-line may be had, twelve ANTENNA SYSTEM AT W2JN . . ° The antenna only 30 feet high and is horizontal for 98 feet. The point shown in antenna drawing and photo- ‘¥ marke th » athens a Bah do Raonted dn: tlhe du fen af Ge Sean : . - : ( , he spot where the ate s Loct t ne free leq 0. A 7 graph) this feed wire is opened, thus 4x mentioned in the text t) witch is opened for 28-mc. work thus adding t to the length of the antenna: ti portion being vertical. The remote making the length from the base to 4 fe the dotted line equal to approximately — three quarters of a ten-meter wave- ete length. The radiating part of the sys- tem is thus changed, in effect, to an ‘“‘L”’ shaped antenna with a vertical component of 24 feet and horizontal length of 98 feet. The complete f T 98 FEET 23 FIG. 1 W2JIN THE NOTE Wc. RADIATING SYSTEM AT SWITCH AT “X. 7 THE SEE TEXT radiating system for 28 me. has a total of 314 Standing waves, making it radiate around the ‘th harmonic. “abled gy from the hacl:- fo the house up the miles to the east. About one mile west there is a small mountain ridge which rises to about 500 feet in elevation, though this does not seem to hinder the propagation of signals in a westerly direction as equally good reports are received from this direction. The receiver used at W2JN is the conventional untuned r.f. antenna stage, detector and one stage of audio amplification. The r.f. stage is shielded from the rest of the set and the complete receiver is enclosed within a brass 1/16” shield, 15” long, 7” high and 8” deep. The component parts and specifications may be noted from the diagram. W2JN originally started business on the 28-me. band with a self-excited rig. It is with this transmitter that the Atlantic Ocean was first spanned in 1928. The antenna used then was a half-wave Zepp with a quarter-wave feeder. We are reproducing a diagram of the antenna along with the self-excited transmitter.

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tely Ost tter in use at present is crystal The transmitter is located in the building at the a 1775-ke. quartz plate. Fre- far end of the antenna. ng to 3550 ke. is done in the plate This transmitter is also used for operation on oscillator. The next doubler is on the 7000-ke. band. It is accomplished by the use in turn doubles to the next tube of a Type ’60 screen grid 75-watt tube which js 14,200 ke. For 28,400-ke. work an- run as an r.f. amplifier on the same frequency as ided and tuned to that frequency. the Type 10 7-mce. stage. When the excitation is ter is completely described by the switched from the 14-me. doubler to the 7-me label of Fig. 4. amplifier the last two Type ‘52 tubes are not controlled from the house. in use. XU2ZUU WORKS WO6OBAX From several sources we learn that XU2UU and W6BAX were QSO on March 9th. We believe this to be the first communication between Asia and U. S. A. on 28 me. XU2UU uses an input of about 15 watts and the an- tenna is one designed for work as a - wave Hertz for 14-me. operation. A single wire feeder is used. JENERAL Except for the above item we have had no reports of new records this past month. Conditions appear to be hold- ing up and it seems that each week- end there are a few new hams who try out the band for the first time. To the newcomers on the 28-me. band we want to give all the encouragement we can; one should not be disheartened if re- sults are not forthcoming at the first crack. Stick at it and you will be amply rewarded. WI1ZL, one of the original 2S8-me. experimenters, is still active and his latest report mentions working Eng- land during the R.S.G.B. 28-mce. tests. The transmitter has a Type °10 tube and is self-excited and until just re- cently a non-directive antenna was be- ing used. This station has just com- pleted a simple half-wave directive antenna, Zepp fed. W1AQD is back on 28 me. with a pair of Type °52’s in push-pull. WIPI is active on 28 megacycles with a Type °10 transmitter. W2ALS is testing at noon daily on 29,000 ke. Transmitter is an m.0o.p.a. nside a closet and door closed after all tuning a ie rts or A) ver 1 Loe nf ile AT W2JN est shelf are a couple of transformers and ndenser or two. The second shelf holds a 52 is used in the self-excited trans- ubes, chokes, resistances, meters and rf. mitter at VE2AC. cesar - 00 ree ge 7 os yee W6BXV reports working K6ALM a ihe diie dias es shelf alone with the on March 16th. As far as we are aware ij with a Type 60 in final stage. WOTELY CONTROLLED 28-MC. TRANSMITTER VE2AC has been carrying out some transmission tests on 28 me. daily with a half-wave directive antenna. A Type The top shelf holds the last two doubler this is the first work between the main- 8.4 ke. The final tank coil and condenser and of U. S. A. and Hawaii. G5HJ rnd tube longside the tank of this stage mat aan rer . P : ; y tins stage may ~~ was heard by W6BXV_ during the ve this coil are mounted the nna meters. series antenna British tests. JUNE, 1930 Ju ae no sic ne th th

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1930 at the ion on he use hich js Ney as tion is 7-me re not n that sO on be the a and an an- sa ly. on. A eS ie have S past hold- week- 10 try ‘o the want - can; if re- » first mply S-me. d his Eng- tests. tube t re- s be- com- ctive ith a ycles y on ).p.a. some with ype rans- \LM ware 1ain- 5HI the

June, 1930 WSDCI reports that GS5WK is ready to go on 98 me. at all times. W4NH has an automatic stal transmitter on 28.4 me. JUNE A.R.R.L. 28-MC. TESTS As announced in May QST7, the A.R.R.L. is sponsoring world-wide 28-mce. tests on all week- ends in June. For those who did not notice the

OST

31 little experimenting with directive antennas by amateurs. We want to hear of results (good or bad) from users of directive antennas. During the past month we have had several reports from Australian amateurs who appear to be on every week-end and besides hearing other Aussies each week, they hear west coast U.S. A. signals and XU2UU. We originally heard there were a dozen active Australian sta- tions on the 28-mce. band but from later reports we make a newer esti- mate of at least two dozen. Well, gang, it’s up to us now. All the skids have been greased. Father Heaviside has promised to shift his layer around to our best advantage

and OM Static doesn’t get a look-in

' on this band of frequencies. Some

2 Citta

a eS SS hams may be worried as to the where- J os abouts of ten meters when making - ° ° . I) the plug-in coil. About the easiest Phy - on paresven s¢ Welk method we have found is to hook up Ps : We fECE whe , . . . as ” , a simple detector oscillator working tra Vo re 1 ? Frost 200,000-ohr variable : . Li - ee on 20 meters and cut and try with , sani fiat eter estistor. o - ° A le urns No. 1 re I R; — 10-ohm fixed resistor our coil until the second harmonic vaced ) Rs — 26-ohm fixed resistor is picked up. Then again, different ke owas He. I awe f Ra S5-chm Fines vesistor commercial harmonics will be heard paced) Rs — 25-0ohm variable re wr (lo- : 9 wa La cesar Se ae re Gtted ccibiiiin Ge ont just below the 2S-mc. band rhere- wed Points marked “X" have fore, one need not waste time worry- Ci late Cardwell ( chokes inserted. They are made ing whether he is around 28 me. or ( tte Cardwell Condenser 50 turns of No. 30 wire spaced . J << 7 ; ‘ not for when one approaches it, some- Ri negohm metall resistor form I diameter dates we will repeat again that the tests are on May 3ist-June Ist, June 7th-Sth, June 14th- lth, June 21st—-22nd and June 28th and 29th. It will that this covers Saturday and Sunday of each week during June. Sections of the 1.A.R.U. have been notified of these tests and many stations have written in signifying their desire to enter the tests and inquiring for more information on antennas and transmitters. This issue of QST7' has plenty of information on transmitters and rectifiers W1IXZ-W1AXV at South Dartmouth, Mass., will be active during the coming tests. WI1SZ will use the transmitter featured on the cover of this month's QST’, and described in detail elsewhere in this issue. The antenna will be a half- wave directive affair. All stations desiring to enter these tests should not hesitate because they are under the impres- sion that special hokus pokus charm apparatus is hecessary to perk on 28 me. May QST7’ has been out less than a week as this is being written. However, we have encour- agement from several sources, informing us that they would be going strong during the tests and most of the hams mentioned the fact that the simple reflector, as mentioned last month, was made use of. Amateurs who are going to enter these tests would do well to seriously consider the use of a directive antenna. There has been very be seen thing will be heard: If it isn’t amateur signal it will be a commercial. lurthermore, don't listen for five minutes and become discouraged because no signal is heard — an \

Cc 6 FEET » eT "i ere 0 C2030 * + UX-852 | c 002 a

7 Rg it 1h | = = Lo, | oo2| ee ‘3 i wr i. = FIG -THE ORIGINAL 8-MC. SELF-EXCITED TRANSMITTER AND ANTENNA SYSTEM AT W2JN ly 5 turns of copper tubing 3 sy" diameter paced. I 5 turns of copper tubing B34" d ameter paced L; — 1% turr f copper tubing 334" diameter spaced. No r.f. chokes were necessary. R 0,000-ohm Ward Leonard resistor. Ri and Re— R.C.A. rheostats. ind C2 — G.R. 50 ppfd. variabli denser. C3 — Cardwell 150-yyfd. double spaced condenser Cs — National 150-yyfd. double spaced ler the band is wide and the amateurs are scattered all over this 1000-ke. band at 28 me.

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OST June, 1939| ¢ you all the greatest month of EXCERPTS ON R.S.G.B. 28-MC. TESTS DX minus the QRM and QRN that We have scant reports on the outcome of the r experienced — and with any power, 28-me. tests held by the R.S.G.B. as reported vy low Continued on page 64 LAtO- co Cc TS WATT STAGE (UUT P 75 WATT STAGE i 75 WATT STAGE 3 75 WATT STAGE = a 80 $ to i | ta | aoe ol ta ct \\ as 4h r - i= SNCS ir ver SI i= t] a 1) ee ac 3\£ (GU) | ° ae | =| 3 - COMPLETE DIAGRAM OF CRYSTAL CONTROLLED TRANS- MITTER ON 14.2 AND 28.4 MC. USED AT W2JdN quartz crystal. Kept in dia. spaced 114"" for operation on ( tant Temperature Over 8.400 ke. onm grid bia re tor 7 100-pyfd. variable enser to tune d Super-Davohm) coil S or S'. Vo. 20 330 wire on 234" U — 10 turns of '4" copper tu ‘ dia paced 4 jor ope 4 , sufd. variable condenser to 14.200 ke C to the frequency of the , turns of yper t ° fal to ast r llat of dia enced for operat . 8.400 ke. . * : — j V — 25,000-ohm (5 Ward-Leonard type r pace the width of a 507-3 a tis : “a reduce 680-volt supply to 180 at uufd vart« ble conder oT fo . . " ot 1 E to nd b mas af 020 amps. jor cry i ¢ llator : foe nape + pag tube. fy eens aad wcaatigg W — 0-100 milliammeter Sangamo condenser “4 Pacent duo-lateral choke, X 0-100 milliammeter. , ; Y 0-100 milliammeter. OD by 3/8" inside diameter ‘ | : Z 0-250 milliammeter. } t enser Vo CA ire NOTE. — UX-852 tubes are used in - ed the width of a the last two stages because of their lou grid to plate capacity of 3 ppfd When / triable conde er to operating on 10 meters, frequency lJ to 7100-ke doubling system is used = throughout. Sangamo cor vo er When operating on 0 meter LC cir- t No d.c. re n cuits PO and TS are both tuned to 14,200- meter form, close ound ke. but no neutralization 1 used. Suffi- Oat aediennes cient grid excitation to final stage is had tur? of 4%” copper tubing by tapping low on coil O. Some regenera- weed 3%" 3” diameter tion is present which is desired, but it ts " sriable condenser to tune not enough to make the circuit unstable. O to 14200-4 1 — I-pfd condenser {i Sangamo condensers in 2 — 1750-ohm variable re tor. ere 3 — 3-Henry choke coil. ohn Ward-Leonard type 4— 2-pfd. high voltage cor denser. 1K re tor & — 100,000-ohm resistor (large type) f ;” copper tubing 4” to lower the peak voltage M6 operation on The rectifier tubes for the Type ‘10 tubes are T ype 'S1. Those for the high voltage stages are Type *66.

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BE, 1930 1e of the rey rted June, 1930 OST 33 Experimenters’ Section SINGLE-WIRE FEEDER ANTENNA PUSH-PULL TRANSMITTER COUPLING THE TO A HE problem of coupling a push-pull trans- mitter to the type of antenna described in September, 1929, QS7' has proved bother- some to a number of amateurs. One way to do it is to couple a tuned tank circuit to the oscillator and tap the feeder on the coil in the separate tank There is another method, however, and curi- ously enough, it was suggested almost simul- taneously by two different experimenters, Vin- cent S. Roddy, WSDJV, and James J. Callahan, W9FGQ. It simply involves the use of two sepa- rate feeders, each placed the proper distance from the center of the antenna, but on opposite sides. The idea is shown in Fig. 1, the antenna in this case being designed for the 7000-ke. band Both feeders should be exactly the same length, otherwise the phase relationships in both haives of the antenna will not be correct. It is also im- portant that the feeders be tapped at points equidistant from the node on the tank inductance. They should also be kept as far apart as possible, and as far from surrounding objects as space will permit This method of feeding, while simple, is the- oretically correct, because the polarities on the antenna will be in correct relationship so long as the precautions mentioned above are observed Neither of our correspondents mentioned how well the method works when the antenna is op- erated on a harmonic but it should be at least as efficient as with the single feeder CONCERNING THE BIBLIOGRAPHY About a year ago it was announced that the formal organization of the Experimenters’ Sec- tion had been discontinued, and that instead of distributing outlines of the various problems and references to periodicals and textbooks in which material on those problems could be found, the policy would be adopted of going over one of the major problems each month in these pages, and appending a bibliography covering all available references on the subject. This has been done, and to date the following problems, constituting the most important of those confronting us, have been considered : May, 1930 — Crystal Control \pril, 1930 — Frequency Measurement. March, 1930 — Amateur ’Phone Transmitters February, 1930 — Constant-Frequency Trans- mitters January, tivity December, 1929 — Radio-Frequency Chokes. November, 1929 — Tube Characteristic Data September, 1929— Loop ‘Transmission and 1930 — Audio-Frequency _ Selec- Reception. August, 1929 — Keying Methods. July, 1929 — Portable Transmitters. June, 1929—R. F. Amplifiers for Amateur Bands. May, 1929— Antenna and Feeder Systems. Included in the above list are just about all the problems which are causing us any trouble at the present time. Continuance of the policy stated above will simply mean duplicating material which hasbeen published previously, with such additions as may have occurred during the year. The question naturally arises as to whether the bibliographies are sufficiently valuable to our membership to justify the use of the necessary space in QST’, or whether that space could not be more advantageously used in presenting ideas and kinks which experimenters find useful. We incline to the latter, and are therefore discon- tinuing the publishing of bibliographies except when there appears to be a real need or demand for them on particular problems. If we have guessed wrong, and the present bibliographies are actually proving valuable to experimenters, nothing would please us more than to be informed of that fact The work of the Experimenters’ Section is entirely informal. Your name does not have to appear on the membership list to make you eligible to contribute. Worthwhile contributions are welcomed from all sources — and whether an idea is worthwhile or not is not always a matter which the originator should decide. We often re- ceive contributions from writers who mention that ‘‘so-and-so was the one who really thought of this, but was too modest to send it in” and that particular idea may have been something which (Continued on page 6 4)

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EWS x Devoted to the interests and activities of the INTERNATIONAL AMATEUR RADIO UNION [AXIM Vice-President: C. H. Stewart Secretary: K. B. Warner He vdquarters Society: Tae American Rapto Retay Leacue, Hartford, Conn MEMBER SOCIETIES League New Zealand Association of Radio Transmitters Italiana A.R.RLI r-Sende-und Empfangsdienst Danske Radioamatorer eniging voor Internationaal Radio- Norwegian Radio Relay League Radio Society of Great Britain Reseau Belge Reseau Emetteurs Francais South African Radio Relay League Wireless Institute of Australia Conducted by A. L. Budlong possible to present the final results ‘eturning votes from the member- regarding the matters taken up in er Calendar, particularly regarding - new members, which is of most | last month, we are presenting the le furnished by Al Giddis, W1LABG re timely, having been compiled for June, July and August, regarding ive had little previous information ire 14,000 ke. » given E.S.T. and G.C.T.) 12:00 noon-8:30 p.m. (1700-0130) slands : 6:00 p.m.—10:00 p.m. (2300-0300 4:00 p.m 8:00 p.m. (2100 M100 ree 9:00 p.m.-12 midnite (0200-0500) 5:00 p.m.—12 midnite (2200-0500) 8:00 p.m.—12 midnite (0100-0500 6:00 p.m.—10:00 p.m.(2300-0300 7:00 p.m.-12 midnite(2400-05% ghtly weaker around 10:00 p.m. but ypy due to absence of QRM.) 1; Sent. I 00 p.m 8:00 p.m LSOO—O 100 12:00 noon 10:00 p m 1L700—03300) 1:00 p.m 9:00 p.m IS 0200) Italy, Spain, Portugal Germany, Poland and Russia (the lat- ter scarce) 3:00 p.m.— 7:30 p.m. (2000-0030) Hungary 9:00 p.m.—10:30 p.m. (0200-0330) (Most Europeans are loudest between 4:00 p.m. and 7:00 p.m. (2100-0000 AFRICA Algeria, Tunis, Sahara, Egypt 2:00 p.m.— 8.30 p.m, (1900-0130) Cameroons, 8. Rho- desia 5:00 p.m.—10:00 p.m. (2200-0300) S. Africa 5:00 p.m.— 8:00 p.m. (2200-0100) ASIA Iraq 4:00 p.m.— 7:00 p.m. (2100-0000) Japan (very scarce) 7:00 p.m.—10:00 p.m. (0000-0300) OCEANIA Hawaii, Philippines, (not so numerous!) 5:00 p.m.—12 midnite (2200-0500 Australia, New Zea- land 11:00 p.m.— 2:00 a.m. (0400-0700) Some more achievements are called forth in the way of WAC. L. A. Paul, VK3LP, sends us 4 radiogram telling of working all continents in four and one-half hours on Feb. 11th. The stations worked were GSYG, XU2UU, FO3SR, WSUF, OA4JS, KAIJR. Then comes L. E. Dutton, now down in Florida with W4MK and W4XQ, who recalls that, while at 9EZ during the contests in 1928, he worked all five continents on 40 meters for five consecutive nights, and a short time afterward worked all continents on 20 meters for four nights within one week JUNE, 1939 X¢

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E, 1930 | WARNER 00030) 10330) .m. and wD 130) 1-300) 1-0 100) 10-0000) 10300) 10-0500 1}-0700) in the 3 us 8 nts in ations SUF, lorida while ed all cutive ed all in one F. E. Handy, Communications Manager E. L. Battey, Asst. to Coms. Mgr. 1711 Park St., Hartford, Conn. Second Roumanian Arctic Expedition XORC to Contact Amateurs — Bassett of W6BSB Chosen as Operator N July Ist the Second Roumanian Arctic Expedition sails from Cherbourg, France, for Greenland for a stay of one year. A study of meteorological, aerologi- s] and radio conditions in the Arctic will be made by Dr stantine Dumbrava, the Roumanian explorer, who has already made four trips to Greenland. Dr. Dumbrava is con- need that a daily plane service between the United States and Europe is practical over the Arctic route. The Fast Air Transport Co. of Canada in accord with this belief will send a plane over the proposed route late this summer. There geno water jumps of over four hundred and fifty miles 4n expedition must carry a complete stock of the necessi- ties of life as well as scientific apparatus and repair parts This makes even a small expedition a costly project. Little does the world realize the tremendous value it receives. To maintain contact with the world, radio facilities will be avail- sble. A four-cylinder Fairbanks Morse gas engine will oper- ste a 32-volt farm lighting plant and also run the 110-volt ii-eycle 1500 v.a. Esco generator, making it possible to use standard plate and filament heating transformers for the radio equipment The largest transmitter will be a Hartley using four 75- Watt tubes operating on 23.65 (12,680 ke.) meters and 40 meters (7500 ke Another 75-watt transmitter will also be wailable for amateur work. The third outfit is a 15-watt fone set for operation on 50 meters (6000 ke.). This will be wed for communicating with the plane The plane will use a pair of 50-watters on about this same frequency. A self-rectified circuit will be used to reduce weight and make it easy to follow the signal. Four receivers will be available, a 150 to 550 ke. for re- tiving foreign press and meteorological data, one medium frequency set for broadcast work, one plane receiver cover- ing from 6250 ke. (48 meters) to 4000 ke. (75 meters) and the receiver for the high frequency work is a new DeForest set type CS5 using two screen-grid tubes and two type O1A. It nsists of one stage of a periodic R.F. followed by ascreen- end regenerative detector and two stages of audio amplifica- tion. This covers a range of 15 to 200 meters and has several leatures making it an ideal receiver for the work. Burgess batteries will be used for the receivers and ‘phone tansmitter, due to their long life and ability to stand the id climate Itis our aim to contact reliable amateurs to facilitate the tandling of our personal messages. The amateurs putting the most consistent signal into our base will be favored with the traffic. This does not mean that we shall not work other sta- tons. If at all humanly possible, we will work every one we bear calling us whether we have traffic or not. Auroral ef- lects are expected to play an important part in the trans- mission and reception of signals, so all those interested sh yuld not think we have slighted them if we fail to answer Qeir calls. An award will be made to the amateur performing epartment June, 1930 OST 35 \ ~~ Se a eS the greatest service for the expedition and I assure you it will be worth striving for During the period between the months of March and No- vember conditions are best for work on about 14,000 ke. and from November to March on 7000 ke. As far as known now, we will be on 23.65 and 40 meters. Our first schedule will be with VAY (Cape Hope’s Advance, Que.) on 23.65 meters August 15th 5:00 p.m. Eastern Standard time (7:00 p.m. Greenland time). There will be contacts with six European countries and with some of the U. 8S. Geodetic Survey boats expected in that territory this late summer We shall exchange QSL cards with everyone worked. Address cards to *‘The Second Roumanian Arctic Expedi- tion, care Explorers’ Club, 544 Cathedral Parkway, New York City he operator and constructor of the apparatus is H. L. Bassett of Oakland, California, and a member of the well known Oakland Radio Club of that city, also W6BSB and W6Ss. Calls are yet to be issued by Denmark for the trans- mitters. All interested should listen for “‘ XORC.” This call will serve until further data is given in QST. — H. L. Bassett, W6BSB, Operator. Why Keep a Log? By E. H. Gibbs * HE matter of keeping a log is one phase of good amateur operating practice which has remained vir- tually unchanged since the beginning, yet the number of stations today without logs is surprising. Not many ORS are guilty, however, for a good log is absolutely vital to traffic work. Some system of recording station activity is a necessity regardless of the type of work (or play) indulged In When an operator fails to keep a log, he not only robs himself of something interesting and valuable, but also does his fellow amateurs an injustice as well. From his log he should be able to check back for the signal report that his DX or experimenter friend wants so badly, or determine the exact hour that he took that important rush message from W7COD. If he cannot do these things, he should be branded slipshod, in the other fellow’s mind The traffic man needs an accurate check on messages handled, a record of reliability of QSO with a certain station or locality, and a place to note frequencies and hours of scheduled stations The DX man wants a record of his QSO with the other ends of the earth, with a complete report of the other fellow’s signal. Even though said other fellow does not QSL, a neat and complete log is pretty good evidence of contact, particu- larly when backed up by a station with a 1930 signal A serious experimenter would have great difficulty in drawing accurate conclusions from results that were never recorded. He must note the details of every change made in his circuits and their constants, and the performance of the layout Even the fellow who just “chews the rag’’ and makes * WSAQ, W1AAC.

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-ontacts is the more likeable for knowing ou before.** If he had a log well suited eall you by your personal “sine” and QSO and happenings since then e comments, it may be said that the log- sses one of the game's greatest thrills — es from spending an otherwise dull hour or is a combination, in varying traffic man, experimenter, and reason it would be a difficult task to of by-zone vears e ot us DX hound e vast maj nen ‘ D “ activ cardin Traffic Briefs one of the factors most likely to be that ority of amateur stations.f In it’s every man for himself, and the who doesn't think enough of his station ities tor we know keeps a ¢ yns worked in addition enjoyment trom reterence »mplete and to a station to the utter of the first contact on subse- g the design eur’s Handbook. of station logs are juest for a steady note is the house wiring the pole transformer supplying elec- Plenty of current can be had through f the house wiring to light the filaments »tor-generator and supply magnetizing late tr: ansiormer — but hen the key is pressed? Perhaps it would ich with the local power company and what about the transformer supplying your particular sec- ution system is large enough to care for ir set ete put upon ss you are und all of the neighbors’ flat irons, it. Generally the power s keenly interested in efficient regulation nger wrote in the other day with the follow- Ar adio operator says he is going to send a loes that mean that the operator on the rad see it?” This is a tough one - we can't ilmost none of our communication is by Josh old terrapin, we should amend the When one operator is compelled to without the acknowledgement of the receiv- h messages should be designated as one ficial Broadcast Station, was pleased and r day to receive a tape record of one of his *Y1IB « tand that W9AWIH f Brazil sts that the gang listen for him on his old us he has difficulty in working through i freq uency ut the 1750-ke. band is occupied, W9CRN tat ons he had worked there in a little » had finished, he had 350 calls chalked s done with a transmitter using 201A 1. Co me on, boys did the same thing and what's the matter band? Let's go back up there and enjoy ne rag-chews and some of the home-like sed to be so easy back in “the good old st Virginia essages from the wives abo were ard was in Panama Bay, sweethearts, and During three months several transmitted from W6AM and re- OST JUNE, 193 ceived aboard the battleship without acknowledgmey When it was impossible for any reason to receive a messag. the battleship wired W6AM for a repeat on some enguigy schedule VELBM claims that low power is the easiest and cheapeg means of obtaining the much-coveted “1930 type” signa) With “high C"’ (a high ratio of capacity to inductance UX210, and 150 volts of direct current from B batterie his note is one that is praised by all who work him In addition to misusing QSR, some operators likewiy misuse QSB. WSAPQ says: “When I tell station: ‘QSB’ they come back and ask why I mention their note when I have already given them ‘pure d.c.’ reports. Ont of that, some of them have the nerve to ask ‘QSS?’, although there is no longer any such Q signal.”’ some W2VY worked WQBG, a yacht lying in Nassau Harbor Bahama Islands, and was requested by the operator to cal Peekskill, N. Y., by telephone. This was done, and th operator of WQBG was informed by his wife of the tim that she would arrive in Miami to meet him. FB! We were surprised to receive news the other day thst W9CRW during a recent cyclone suffered the loss of his pants, which were torn from him by the high wind. Ther was a sum of $20 in the pants, too, but this was insignificant when compared to the fact that the antenna towers of WRHM were entirely demolished and the transmitting building (aw, g' wan the proper name) wa blown off so far that it has not yet been found. W9CRW was fortunate in losing only his pants, and not his health with them. A newspaper headline recounting other detail of the same storm bears the following hair-raising news “3 Horses Take to Air in Storm; Creek Blown Away” Whew! —shack is When W6BTX worked W6YG, the physics instructor iz a California high school, W6YG asked him to send a quar of water from the Great Salt Lake, to be used for testing and analysis. W6BTX sent the water and later received s radiogram acknowledging receipt of the quart. FB for amateur radio! HIGH QUALITY SIGNALS Every amateur takes pride in the audibility of his signals He should take equal pride in the quality! We cannot al have the loudest signal on the air, but we can have a high quality signal if we so desire. It may take time and many adjustments but surely our efforts will be for the good of all What is the definition of a High Quality Signal? It must be a steady signal. It cannot be a.c., i.c.w. or other pass type. It must be clean-cut. There can be no ripple, no back- lash and no key clicks. Any amateur can judge a received signal. He can also judge his own signal by the ws of a monitor. To obtain a High Quality Signal you must use a certain amount of and a larger amount brain work Most downfalls of good signals come with the alibi, ‘‘ What's the use of having a high quality signal? As long as I get out I don't This has no grounds to stand on and, the less it is used, the better all money, of care about anything else."’ excuse signals will be Any e.w. or "phone amateur whose call is listed in QST's “High Quality Signal” list should feel justly proud of his signals. Let us hope that the number of “ proud’’ amateurs will increase each month R.L W8DED Sakker ° While QSO W9GDM one night, Mayer, K4KD, dix covered that W9GDM was located a few miles from his old home town. W9GDM called Mayer's home on the "phone got his father on the line, and a two-way conversation be tween father and son ensued. As K4KD has been away from home for ten years, every one concerned got quites kick out of that QSO. KAKD and W9GDM now keep § weekly schedule, which beats the mails by seven days! a = ae an the a anata ee a

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TE, 193 vledgment A €Ssage ne CNSUlng id cheapes pe signal uctance } batterie rs LKewig e station their note rts. Ont ilthoug! 1u Harbor itor to ca ? and the t the tim

loss of his ind 1 here significant towers ansmultting ame was W9CRW his health ier details ing news ray” tructor id a quart or testing received 8 FB for is signals annot al ive a high nd man yd of all > It must her passé no back- received y the w a certal in Work What's I get out » has no re tter au in QST id of his amateurs W8DED <D, dis 1 his old ' *ph ye. ition be n awa qu tea’ keep 3 Lvs

June, 1930 The following “ the February ! A.R R.C. of Los Angeles “I haven’t got any license yet, but little while and nobody'll get wise.”’ Famous Last Words” are quoted from ssue of the Oscillator, published by the I'll only operate a and operated, a low-power station For three

If pr perly adjusted just as efficiently as a high-power rig months or more W+4UM has been keeping a daily schedule with VE4BU on the 14,000-ke. band. Both stations are ysing UX 210 tubes und is very commendable, especiall; will work Chis schedule has proven most consistent

in view of the power und frequency used We all remember old u2U0 operated by the New York

Time i the brute-strength signal that came from it. The ll 2UO changed hands some time ago, and W2NH ells us that the new W2U0O is using a UX-199 with 150 Its from a ‘‘B” eliminator.

Tl wing headline appearing in the Dayton (Ohio) Daily N s furnished through the courtesy of W8SDBK Port W um Bank Robbed By Amateurs.'’ This gives us tea It ntil we read on and find that they were not rad € s,’’ but rather mateur bar s."’ Hi. Fr the Personnel Office of the New York Stock Ex- hange d K4AKD we receive the report of the exchange f scores covering a rifle match held between the teams of

e Stock Exchange and the University of Porto Rico at Rio Piedras. KAAKV (Ponce, P. R.) took care of the Porto Rico end, and WSCPC (Buffalo, N. Y.), managed the New York end. The line-up for both teams was exchanged, and when final s Robertson, in charge of the University team, telegraphed them to K4AKV, who passe dthem on to WSCPC. WSCPC in turn telegraphed The Stock Exchange team In addition to Exchange has used amateur radio for a of other matches. W9EAJ relayed scores to W7GL D h t i m in Jerome, Idaho have also been exchanged in matches shot with teams in Montreal, Canada; Worcester, Mass.; Chicago, Ill.; and other cities.

res were available, Lieutenant the results to the Exch inge itch with a score of 3648 to 3172

teh, he

a match shot against a tea Scores

Texas morning hours for operating or sched- is light during the Use of the early ules held at any time when interference day — will make possible dozens of pleasant contacts you ally wall find the

may be missing now. Low power men espe odd operating hours better for rolling up enviable records DX is far from dead on 3500 ke. On November 26 W1AZW worked W5APG, W6CSU, W7UN, WSCYP and W9PW in that band all inside of one hour! When s in 8 band 80 prevalent on some of bands. Another consideration leading m creased use of the 14-mc. band is the “ unimportance of the power"’ consideration the fellow with the 7'4-watt tube seems to stand about as good a chance for everything as does the fellow with a water-cooled tube. Many stations can be worked after darkness falls A significant fact is that the 28 mc. fellows make st of their arrangements for tests and contacts via the band. It’s an ideal band for summer work — you're mussing something if you don’t use 14 me. mer comes, many of the fellows move to the n order to escape the QRM and QRN that are the other more commonly used toward in-

in spite of rumors to the contrary

The begir ning amateur is, of course, anxious to get on the air. He wants to rush his transmitter in the process of build- ing, so that he can get on the air and work somebody. (We But the fellow e and puts everything together in the best fashion is the fellow who will be farthest ahead a year later If it is necessary to wait a few weeks for those filter condens- ers, let's take the time to do it. When we finally get that transmitter put together it should be, the air proudly. And in this day the fellow with the clear-cut, pure signal is respected! know, for we used to be beginners ourselves who takes tin then we can go on

OST 37

We are pleased to announce that WSCYK, who has been prominent in amateur activities in Western New York, graduated recently from the Communications Course in Air Craft Radio at the United States Army Air Corps Technical School at Chanute Field, Rantoul, Ill., with a grade of 93.89, the second h ghe st ever attained in the school. FB! W6BAX claims that he has recently worked all continents within 48 hours. WAC inside of two days!! This is some- thing to shoot at And W6BAX says he used only 45 watts input, t fellows Webb of W4NE rer some 1arks on how tiresome it is to listen to of the bunch prepare to sign off. “Best DX, best of is superfluous, for 73 means t regard hope to QSO agn, blah, blah, blah, etc.’’ As Webb says in his letter, “73 itself covers a lot of territory and should be sufficient. Let’s make an effort to eliminate all that other superfluous stuff, and make our operating more snappy.” luck, cuagn, best 73 (the best To improve the speed and dependability of amateur traffic handling, G. L. Graham suggests that individual amateurs select dependable stations well within range, and at various points of the compass, arranging schedules to suit all con- cerned often enough to keep the hook clear, keeping the frequency of each station fixed and observing the hour of the schedules most faithfully. Of course, each station in the net should endeavor to originate traffic for the other cities con- cerned so that some real worthwhile traffic activity can be built up. The whole system stands or falls on the character of the operators selected to coéperate in this plan and their ability to be on the job. The “ 5-point system"’ detailed in these columns some four years ago embodied this idea and time has shown that the idea is entirely practical and work- able. Go to it, OMs the Roanoke Division in March, is addressed The following, which was read at Convention held at Charlotte, N. C to ‘“‘the members of the American Radio Relay League, and comes from the Director of Naval Communications, Captain S. C. Hooper. Captain Hooper has an amateur ition and is on the air signing W3N! The Navy is particularly interested in the amateur, and the A.R.R.L. Representing the Navy, I opportunity to impress this interest

8

its organization, wish to take every upon the membership During the World War it was necessary to expand the radio personnel ten times, and such measure of expansion will be necessary in any war. The radio personnel called to the colors must be qualified in operation, naval procedure, code and cipher work, use of Naval calls and frequencies, and in fact must be trained in the habit of Naval communi-

day they are mobilized. It is impossible to ac- complish this training except through a well drilled Naval Reserve. Funds will never be available to adequately train a reserve in peace time, except through the medium of a Volunteer Reserve, in which the Navy contributes only the certain pamphlets and some instruction. Such cations the opportunity, a reserve is now under way. For a volunteer organization to be successful, it must be built upon a solid foundation, first, the desire for the in- dividual to perform at reasonable, but slight self-sacrifice, rvice in memory of the debt each owes those who have g fore; second, the work must be interesting and of value in perfecting the individual in something worth while. This latter is true of amateur work generally, other- wise the A.R.R.L. would not have prospered and survived these many years. Therefore, the Navy has chosen to build its Volunteer Reserve on the foundation of the A.R.R.L., to rely on its members for directors for advice, and any suggestions from this body will always be most welcome

patriotic s

service, its indeed. The amateur has pointed the way for progress in the past, and will do so in the future. S. C. Hooper, W3NL Captain, U. 8S. Navy, Director of Naval Communications.

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OST ASS POUNDERS’ LEAGUE Ory Del Rel Total 124 193 789 1106 468 31 730 R84 98 114 608 S20 i79 188 130 697 92 Lil 473 676 615 11 626 91 25 4 620 92 176 350 618 244 SS 268 600 255 321 16 592 27 128 430 8 93 123 328 rat 259 145 124 028 168 10 10 iSS i4 7) 304 4163 S4 na) $18 158 73 2 $18 413 43 42 316 401 0 26 350 396 207 113 70 390 97 81 ‘ s82 42 5 303 s70 115 164 67 $46 6 24 250 30 3 19 246 $25 200 109 6 $15 Q 40 261 310 4 7 280 301 42 73 186 301 66 20 210 296 25 23 234 282 12 13 254 279 12 262 27 271 27 26 38 198 262 164 4 93 261 I 14 228 243 »9 22 182 233 19 16 190 225 15 16 192 223 187 13 20 220 11 7 198 216 115 48 51 214 35 48 130 213 28 39 145 212 74 23 106 203 Il 41 150 202 16 42 144 202 32 14 154 200 43 105 16 194 116 66 6 188 44 62 80 186 20 62 S4 166 70 83 4 157 33 53 68 154 14 55 S4 153 42 57 42 141 15 58 61 134 55 52 16 123 24 50 30 104 38 51 89 24 59 83 155 30 232 417 il 40 216 267 mateur stations responsible for the best the ones that are “setting the pace" in affic handling are listed right up near r B.P.L., the figures giving the exact station accurately. tations appearing in the Brass Pounders’ ed for their consistent schedule-keeping lable message-handling work in amateur sl credit should be given to the following tl order listed responsible for over one trertes in the message month: W2QU, BUW, W6AD, KAIDJ, W9COS, W6WA, ERK, W3BWT, WIMK, KAICM, WSYA, VOEF nt! A total of 200 or more bona fide led and counted in accordance with tice, or just 50 or more deliveries will put place in the B.P.L. Why not make with the reliable stations you hear and undie the traffic that will qualify you bership also? i from May QST New Jersey was unable to conduct th a friend in Peking, China, by cable, steur radio. W2JN gave the 84-word H, who QSP’ed to KIHR within 24 lay to China. This is just another star in wn. Snappy stuff, OMs!! JUNE, 1939 W6CUH recently had an odd QSO with HCIFG. The owner's sister was at the key and spoke nothing by Spanish. A 45-minute rag chew ensued (entirely jg Spanish), and W6CUH was kept hopping to keep up with her rapid-fire Spanish, as she handled a key as well as the language. Hi. You did well, OM! At the time the Graf Zeppelin was in Japan prior to ity flight to Los Angeles W6CBW was QSO J7LL, who was located near the field where the Zepp was sheltered. The Jap could look out of his window and see the Graf being hauled out of its hangar to be groomed for its trip. He told W6CBW of the beauty of the scene — how the long, low silver shape shone in the moonlight. That is some thing new — a picturesque QSO! Traffic handlers — what do you think of W6TM's in. genious method of securing message boxes for filing his traffic? He got an old hard rubber, 12-volt storage battery case from which the plates had been removed. All that hedid to make it ready for use was chip off the several small ridges that protruded from the bottom of each compartment, and then paint it to make the appearance neater. The finished product is an indestructible case, having six compartments just the right size for message paper. The various compart- ments are labeled, “ Originated,’’ “* Delivered,"’ ‘* Relayed,” etc. Sounds good, eh”? WI1MK A.R.R.L. Headquarters’ Station WI1MK _ operates on frequencies of 3575 ke. and 7150 ke. Robert B. Parmenter “RP,” is the chief operator; his fist is familiar to most of the amateur fraternity. Occasionally other members of the Headquarters’ staff operate at W1MK. Their personal signs may be found in the QRA Section of QST. Throughout the following schedules Eastern Standard Time will be used. OFFICIAL AND SPECIAL BROADCASTS are sent simultaneously on 3575 ke. and 7150 ke. at the following times 8:00 p.m.: Sun., Mon., Tues., Thurs., and Fri 10:00 p.m.: Mon, and Fri. 12:00 p.m, (midnight): Sun., Tues., and Thurs. GENERAL OPERATION periods have been arranged to allow every one a chance to communicate with A.R.R.L Headquarters. These general periods have been arranged so that they usually follow an oficial broadcast. They are listed under the two headings of 3500 ke. and 7000 kc. to indicate whether the watch is devoted to listening on the 80-meter band or to the 40-meter band 3500 ke. 8:10 p.m. to 9:00 p.m. on Sun., Mon Fri 10:00 p.m. to 11:00 p.m. on Tues. and Thurs. (No OBC sent before these periods. ) 2:00 p.m. to 1:00 a.m. (or later) on Sunday night (Mon- day morning). Tues., Thurs., and 7000 ke 10:10 p.m. to 11:00 p.m. on Sun., Mon., and Fri 12:00 p.m. to 1:00 a.m. on the following nights (actually on the morning of the day following): Mon., Tues., Thurs and Fri. (Only on Tues. and Thurs. does the OBC precede these periods.) SCHEDULES are kept with the following stations through any of which traffic will travel expediently to A.R.R.L. Headquarters, on 3500 ke.: WIACH, W1AQD, WIBOD, WIBXB, WI1ZA, W2JF, W3BWT, W32F, WSARX, WSCEO, W9OX, VE2AC, VE9AL; on 7000 ke.: W4SK, W5PA, W6CIS, WO6DEP, W6OJ, and W9DFY, Traffic Briefs VE4EC, SCM of the Alberta Section, advises that § Hamfest will be held at Edmonton on July Ist. Prizes will to s bel togt F.R Pac Ath Cer Nev Hu Mic Dal me mat ton Wh

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2, 193 FG The hing but tirely ip Pp Up with ell as the "10r to its Ww ho was red. The raf being trip. He the long ‘Ss some M's in- filing his p battery iat he did all ridges ent, and » finished artments >om part- ‘elayed,” rates on rmenter most of rs of the nal signs tandard J tumes inged to R.R.L .nged 80 re listed indicate U-meter rs., and fo OBC Mon- ctually Thurs precede tations ntly to 1AQD. W3ZP, 00 ke.: ve that 8 e3 will JunE, 1930 be given for code speed and various other contests, and a “big time”’ is planned. A nominal charge of $2 will be asked of each ham who attends. Write to Mr. Barron, Suite 2 Warwick Apts., Edmonton, Alberta, for reservations. FOX RIVER RADIO LEAGUE HAMFEST The Fox River Radio League extends a cordial invitation all amateurs to attend its third Annual Hamfest to be beld at Aurora, Ill., on June 21st and 22nd. A real “ get- together "’ is planned and a good time is promised to all who are there. Write to Mr. J. A. Stoos, WYDTC, Sec’y-Treas F.R.R.L., Naperville, Illinois, for full particulars Official Broadcasting Stations CHANGES AND ADDITIONS Local Standard Time WSHD (3659 ke.) Mon. 8:00, 9:00 p.m.; Sun., 12 midnight. W9BVP (3740) Tues. 7:00 p.1 7060) Thurs. 10:45 p.m.; 14,100) Sun. 10°00 a. W5AJL (7240) Tues., Thurs., Sat. 8:00 p.m.; Sun. 11.00 am. and 3.00 } Traffic Summaries MARCH-APRII Pacific led by Los Angeles 11,126 Atlantic led by Western Pennsylvania 1918 Central led by Ohio 1682 New England led by Eastern Massachusetts 1257 Hudson led by Eastern New York $245 Southeastern led by P.R.-V.1 3369 Midwest led by Missouri 2853 Dakota led by Southern Minnesota OST 39 West Gulf led by Southern Texas 1649 Delta led by Tennessee 853 Roanoke led by North Carolina 774 Northwestern led by Oregon 711 Rocky Mountain led by Colorado 258 Quebec 224 Ontario 131 Prairie led by Saskatchewan 102 Vanalta led by Alberta 94 765 stations originated 10,881; delivered 9426; 22,049; total 42,497. (94.25% del.) relayed strong this month and again ms the Traffic Banner! This Banner goes each month to the section with the largest total of re traffic summary showing the standing of the various divi- sions for the past month is printed above. What place does yours take? What Section will carry the Banner next month and help its Division head the list? Los Angeles comes back 1 messages. A Due to an error in last month’s summary, Arkansas was given as leading the Delta Division instead of Louisiana Louisiana led the Division with a total of 455. DIVISIONAL REPORTS ATLANTIC DIVISION OUTHERN NEW JERSEY Acting SCM, Bayard S Allen, W3ATJ Our SCM, W3BW4J, bas left the state and is busy installing the sqawkies. He has left me temporarily in charge. Please codperate with me in the matter of reports, fellows; the percentage of reporting sta- tions to active stations in this section is disgracefully low. Whether you are an ORS or not, please report every month. W3DH, the Princeton University station, with the aid of tight skeds twenty-seven times a week, makes the BPL for the first time in five years. FB. W3ASG has installed a 100- meter fone. W3ATJ only snared 5 QSOs with 4 ntinents giving that total W3AWL is working in the southern part of the state, and will be on with a portable this nonth. W3BAN is a new station at Eayrestown watt 85S Traffic: W3DH 620, W3ASG 45, W3ATJ 5 EASTERN PENNSYLVANIA SCM, Don L. Lusk, W3ZI Spring and static now seem to be the general mplaint rather than handling traffic. W3QP signed off for scouple of months; guess Jack thought about the Y Ls and flowers and forgot radio. Too bad, OM, but I know how 'tis. W3AUR says DX on the 14-mc. band is improving. W3APH $a newcomer, and is certainly welcome. The 15th of each nonth is the reporting date, OM. The SCM almost fell over when he got a report from ole W8EU — yep, he’s back again. We regret to report that because of illness, WS\VD bas to cancel his ORS temporarily. W3FY reported enough traffic this month for a non-ORS. W3AKB evidently has the 0M and spring fever combined. WSCWO is back again — hespent a couple of months in Chicago and had a very fine tmp. W3LC is getting out nicely now that he uses a MG set W3MC heard the Pilot Bermuda plane when it was forced land. W8SAWO complains of amateur Haters. We must «knowledge a report of 15 off-frequency reports from our Official Observer W3MC, who has done some mighty fine work in this We into amateur radio W3AQQ; here’s wishing you fellows luck and plenty of traffic. Don't forget the convention at Erie, fellows. The SCM hopes to be on hand and sign up afew ORS prospects W3ZF has a new superhet perking nicely. rraffic: W3ZF 301, W8CWO 126, WSEU 40, W3LC 34, W3MC 83, W3AUR 33, WSVD 32, W3FY 31, W8SAWO 19, W3AKB 11, W3APH 8. MARYLAND-DELAWARE-DISTRICT OF COLUM- BIA SCM, Forrest Calhoun, W3BBW — It looks as though the summer “rest"’ period is starting early this year. Quite a few of the gang forgot to report this time. We can’t get that banner that way. So let’s make another stab at it. What say, OMs? Maryland: W3CGC leads this state by a big margin. He is QRL track work at J. H. U. W3LA reports some DX but not much traffic. W3AFF sent in a nice report and says he is putting in remote control to the cellar for the summer. He also reports W3WF has a new B/C set, so is only ononcein a while. Hi. W3ON is a new one and is waiting for a tube. Let’s hear from you, OM. W3BBW is experiment- ing with A.C. S/W receivers, also changing the shack around a bit. W3A00, a new ORS, has done some fine work using only 2 201A’s. W3DG handled some traffic for a change. Keep it up, OB. W3GF wants his ORS put in storage while he tries his hand at commercial operating. OK, OM, it shall be and hope you join us soon again. W3NY blew his rectifiers while trying to get his 250-watter going, but has new ones now. W3PQ reports some success with a.c. receivers. The SCM had a visit from W6ZZG, who is portable station of W6AEPF. Also had W3CAB call on me. W3DQ, ex-5ANJ, is starting up in Baltimore. Delaware: W3ALQ is the lone star of the state this time. He reports two new hams at Seaford, W3ABB and W3BAR. Let's hear from you two. District of section welcome

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») an error on my part in April QST, ndled quite a few, is listed as W3AHM He says no shut-down during the was chased down some on the band by was visited by W3OE. W3PM made the FB, they also expect to get on 14,000 1 a report covering three months, han- W30Z was also visited by WS0OE and should do some ew OBS, lost her antenna ina storm, but W3AKR just reported his traffic W3GT has just returned from a tour as op on AB6. He is now trying for a W3BF 214, W3PM 141, W3CGC 9, W3AFF 17, W3BBW 12, W3CDQ 7, W38ALQ 6, W3DG 6, W3GI NNSYLVANIA — SCM, A. W. MeAuly, gain leads with a fine total WSDLG plans to of schedules going during the layed a message from Kio de Janeiro WSCFR is still in me by the time this gets into print get his report from Brazil WSDUT says that his schedules VSAGO has a new junior op WSBQR is a new station in State ne of the ops at WSYA. WSBWI. sends SIM is a new ham in Altoona. WSCB, Juniata College station resented by WSDKS and WSBZE. WSASE watter. WSAVY has grown from 15 watts n the Section Certificate in the Sweep- ng for a schedule with Pittsburgh. WSBEY » new OW. WSARC is doing his bit in the says the new regs are FB. WSGU is on f the Erie gang are on 14,000 ke rds. WSBHN is busy with plans for the t's all try to attend this year. It looks good. yur station or vicinity mentioned in the t is because no one sends in a report to the sand cards on the 16th of the month. 76, WSDLG 223, WSCEO 55, W8CUG in fifteen minutes . WSARC 3, WSAPQ 62, YORK — Acting SCM, WSDSP leads the list with 325. WSBJO WSCNX handles plenty of mes- WSABQ has a new Hi C t the shack, and notes a great improve- san ORS. WSAFM reports good coépera- equency stations he notified. WSCHG has nitter on 14 me. WSCPC just returned WSALY and WSAZL have had some luck handles traffic. The Utica gang had a nguet April 5th. The Atlantic Division held at Erie June 27th and 25th tates that traffic is on the blink. WSBJO ’ WSTH is working on a portable WSCNX is preparing for season on DSP won the Sweepstakes Certificate for WsQL has cancelled all schedules. number of schedules. WSBHK reports WSCDB asks the gang to listen n aboard a big cabin airplane WSDME is rebuilding to use "phone on i to drop all schedules because of sick- sent in a mighty fine report of James- » WSAVM was one year old April signed as Secretary of the Jamestown s off the air. WSBIF is building a sa new power supply OST JUNE, 193) old-timer, is back on the air on 7 me. with an 852. WSCMN has been very sick recently. Ex-WSDGI now has his ney call, WSCUC. WSBGYV reports. WSNW is pounding oy much better with a new antenna system. The Jamestow, Amateur Radio Association is growing by leaps and bounds WSBQB, the first CW ham in Jamestown, is now located ip Warren, Pa. The Radio Association of Western New York held its annual meeting and dinner at the Sagamore Hotel Rochester, April 26th. A pleasant evening was spent by al present. Traffic: WSABQ 1, WSCKC 14, WSCSW 19, WSDME 22 WsCDB 40, WSBHK 148, WSOA 147, WSBJO 2% WSQL 28, WSDSP 325, WSBGV 36, WSCNX 61, WSTH 4 WSDII 27. CENTRAL DIVISION LLINOIS — SCM, F. J. Hinds, WOAPY — Any station I handling traffic may send in his totals to the SCM and help our state total W9FCW has been appointed Army-Amateur station for his locality. 14,000 is still bring. ing in foreigners consistently at WOBRX. W9OLL is re vamping the receiver. A new receiver is coming out at W9CKM. W9BVP has radiogram service for the company with W9AKZ only personal messages. W9CKZ says the R. I. was down, and all 12 taking the exams passed FB W9BLL complains of QRN getting worse. W9FDJ is re building to stop BCL QRM. Y Litis is bad at W9F VO, but he will soon be on 20. W9BNI is working on a crystal-con- trol outfit and will soon use 210, S65, 203A and 852's W9EEN, W9EYA and W9CNY are the only hams in town and are all going 100%. W9GYV is back home from Honolulu W9KA is moving again. 180 volts on 171A with “B” bat- teries is the power at W9ACU. A policeman neighbor of W9GIV grounded the sky wires at W9GIV with No. 8 wire Hi. W9FPN is mostly on 14 me. The Morton High School Radio Club will soon poke a hole in the ether with a new 75-watt outfit. WYCKO is the new call at the Downers Grove High School Radio Club, of which W9GJJ is presi- dent. W9BMQ built a new shielded set, but the old ‘phone ringers still come in to QRM the dials. W9CUH says he is now on 20 for the summer. W9DJ will send baseball scores to W9CSs, who is oping on WPBE on the lakes this season W9EF has moved into Illinois — thanks to him for our large traffic totals this month. Hi. W9EF has been QSO Rawson's Yacht WQDI, and now has his WAC certificate. W9EJO is batting off traffic in spite of getting ready for college W9BZO has a new acreen grid with full a.c. operation, and no hum. WYAFN has a 210 with which he is working better than the old 852. W9BVV is using remote control and has a new 40-meter Zepp. W9AFF is still busy with speech am- plifier work. W9DAX has a report from W6ARM stating his fone was heard on the west coast. WOBEO has rebuilt his *phone on 165 meters and is getting out FB. W9GCD hasa new water-cooled job. FB. W9DZM is helping the 129th in- fantry at Sycamore get started with A-A work. A new 500-watt "phone crystal set is going at W9DZM-WYEKZ W9ERU claims the world championship for most foreign countries with least contacts. W9F FQ is getting out well too. W9BXB is coming along in great shape again. WYASY has a new screen grid ala April QST. Static has been the chief drawback at W9AKA this month. W9BPT worked all districts and 75 stations his first two weeks on the air FB, OM. W9ENQ has gone to 20. W9ANX blew the filter W9DLYV reports fine DX using two 201A's in a Hartley W9Dss says 80 is going from bad to worse for the summer W9BDW has now worked eleven countries. DX is improving at WYANQ. W9FUR QS0'd WFBT Traffic: W9EF 194, W9BVP 120, W9DZM 117, W9BLL 65, W9CKM 65, W9DKK 60, W9FCW 52, W9GV 4 W9EJO 43, W9BZO 38, W9DOX 30, W9BNI 26, W9LL 25 W9APY 24, W9ASY 23, W9AKA 21, W9ANQ 20, W9AD 18, W9ERU 18, W9CKZ 16, W9CZL 16, W9FDJ 16 W9IGLV 16, W9CUH L4, W9DSS 14, W9AFN 13, W9PAL W9AMO 10, W9FVO 9, W9GJJ 8, W9ACU 7, W9BDW 7, W9BMQ 7, W9KA 7, W9CNY 5, W9KB 5, W9FOV 1 INDIANA —SCM, D. J. Angus, W9CYQ — W9RW isex- perimenting with xtals, ants and amps. WYRE has « hanged his QRA to Muncie. W9AJH wants skeds and traffic W9GGJ has joined the 65th Corps A-A net. WOBKJ is busily engaged in grinding xtals, and will have one if the Je sup bk “ off for Fri wel wo ban xtal buil 8 Pp and wo let | bac. beit met and hor mol to t the con 5

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E, 1930 WSCMN 8 his new nding Out amestowy d bounds located in vew York re Hotel ent by all DME 22 LIQ) 20% WSTH 4 iV Station SCM and Lp pointed ill bring. L, is re EZ out at company says the ssed FB DJ is re- VO, but stal-con- nd 852's sin town lonolulu B"’ bat- ghbor of ». & wire h School h a new Downers is presi- i "phone uys he is scores to ) Beason pur large Awsons WY9EJO college ion, and g better and has ech am- stating built his D hasa 29th in- A new )VEKZ foreign ut well WOASY een the rked all the air e filter lartley immer roving V9BLL iV 44 ILL 25 W9AD DJ 16 IPA l2 DW 7, OV 1 \ is ex- hanged traffic skJ is if the June, 1930 supply of blanks holds out. Leo Wilcox at Fort Wayne has blossomed out with a new call, W9BHM, after a few years of the air. W9BJIKK has a portable, low power in operation for code instruction for beginners Monday, Wednesday and Friday. W9AEU is the new set in the Fort Wayne N. G armory. W9ETH blew his 50-watter, but gets out just as well with a 210. W9AXI is putting in an a.c. receiver W9AAI is putting in an xtal in order to keep his fone in the band. FB. W9CVX is still xtal-controlled even though his stal has dwindled down to the size of a pea. W9BWL is re- building his phone set so it will be bigger and better. WO AET s putting in xtal. WY9AKJ wants skeds with Indianapolis and S. Ind. W9F YB reports “ we expect a new ham soon.” W9ENX got across his plate voltage and nearly forgot to et go. WYEBU is going at Connersville again. W9FCC is back on the air again. WO9DZX and WYEGE-W9GCO are being badly QR Md by:-the YLs. WYEF has moved to Calu met City, Ill. W9GJS installed a UX 250 and a new rectifier, and is burning up the air on 7200. A U.S.N.R. communica- tions unit is being organized at Purdue University this month. Section 3, 9th Naval District, won the cup awarded to the section showing the greatest relative growth during the year. This section Indiana. A U.S.N.R communications unit is in the process of being formed at Michigan City. W9AOO has a new 866 rectifier and §-watter. W9CIC is on U.S.N.R. skeds regularly W9CNI has a new outfit, 2 210's and rectobulbs on fone W9EPH reports that W9F XM _ has returned from the hos- pital. He will be back on 7000 ke. before long. W9BZZ, W9ICMQ, F9F XO have new s.g. receivers. WOCWS is going to L. 1... N. Y. W9EPH keeps skeds with WSAQY, WSMV and VEARR on 7135 ke Traffic: W9DSC 8, W9CIC 8, W9DDG 76, W9AKJ 56, W9IGGJ 44, W9GCO 41, W9AET 44, W9DBJ 10, W9BKJ 6, WO9FYB 3, W9FCG 10, W9CHC 28, W9AIP 26, WIEN X 4, W9AHB 3, W9GJS 23, W9CYQ 16, W9EPH 25. KENTUCKY SCM, J. B. Wathen, III, W9BAZ — Any Ky. ham who missed the 'Fest at Covington — well, just ask anyone who was there. W9OX cuts loose and puts his mark on “The Pint” for him and two for W9AZY. The latter is also QSA5 in six continents. W9FZV is hang- ing an ORS tag on the shack wall. W9BWJ and W9ARU got all their traffic on 7 mc., thus proving it can be done. W9BX K is still trying to persuade the xtal to perk. W9GGB has a sked with ex-W9CRD. W9EYW is trying out 14 me. W9CEE is now pushed by MOPA; results FB. W9AIN has another pink ticket. WOENR is getting DX and traffic. WZZE now has a WE212D. W9DDQ is plugging away for his ORS tag. We are expecting big things from W9EGO. W9EQO has scarlet fever. W9BAN is installing a new rect. and filter as per Uncle Samuel. W9F KM was bit by the DX bug but, we are glad to say, has recovered. Gangway YLs, bere comes W9BAZ in his new “can,” collecting reports. Kentucky has many more active stations who never report. Don't be like that; people won't like you! How about the fones? Get your skeds fixed up for the coming hot weather W9AUH is working on 28 mc. Sundays during May and comprises now June. Traffic: W9OX 165, W9AZY 79, W9BAZ 70, W9DDQ 2, WOBWJ 34, W9BXK 33, W9FKM 31, W9ENR 25, W9IARU 18, WOFZV 18, W9CEE 13, W9AUH 7, W9BAN 5, W9EYW 5, W9AIN 4, W9OZZE 4, W9GGB 2. MICHIGAN SCM, Dallas Wise, WSCEP — WSDED reports Army traffic going good although warm weather has lowed up things some. WSDYH has been working both $500 and 7000-ke. bands and leads the traffic handlers this month. He is now sending his code practice lesson Sunday am., 11:00 to 11:45 E.S.T., on 3600 ke. W9YEQV says he is too busy to pound brass. WSAEQ reports spring house- deaning cut the total this month. WSCU has a new monitor and is now working on a three-stage MOPA transmitter WS8D DO is working on 7000 now, but says things are slow. W8ASO has the outfit perking again. WSBRS has been re- building and sure has a nifty little outfit there now. W8DYH and WSCEP dropped in to give it the once over. WSZF has been having hard luck getting licensed ops to run the sta- tion, but has great hopes. W9AXE is another who is re- building, and now has the set going on 14,000 ke. WSACB has changed over to MOPA, but hasn't tried it out as yet. W9EGF says the air is punk up that way. W8CKZ is plug- OST 41 ging away as usual. WSAUB has the television outfit in operation and has had some fair results. W9GJX is having good luck on 14,000 and says to save hera WAC certificate. WSPP has purchased a crystal and will rebuild the outfit into a crystal-controlled job. Ex-WSBAX has come to life with a new call WSDHM and will be on soon with a couple 210s and a crystal. WSBGY won a certificate in the Sweep- stakes, but reports no traffic. W8BAA has been on with an old 202. WSCOW has one of the new Aero tuners and is busy rebuilding the receiver. WSWO is having lots of fun with 14,000 fone. WSCEP hasn't been on much, but is working on a new 7000 crystal-controlled job. The gang at WYE have been out on the coast with the Army in the Mimic Warfare there, so no report for this month. WSDMS, WSCAT, WSCEP, WSDYH and WSVT have been busy getting things ready for the coming ham-fest at Ypsilanti. W8SWF is busy remodeling the fone set Traffic: W8DFS 49, WSDED 41, WSDYH 279, W9EQV 10, WSAEQ 30, WSCU 9, WSDDO 22, WSASO 23, W8BRS 22, W9AXE 23, W9EGF 12, WSCKZ 28, WSAUB 4, W9GJX 20, WSPP 27, WSBAA 2, WSCAT 45, WSCEP 5, WSCOW 12, W8WO 4. OHIO — SCM, H. C. Storck, WSBYN —A lot of you have been neglected and, perhaps, some reports will not get into this report. Business forced me to get behind in corre- spondence and then April Ist, I left Columbus to work in Dayton and since then have been very busy. As soon as work slacks up, I will get at it and answer letters until this old mill wears out. WSRN is with us again and makes the BPL two ways. He leads Ohio, but on the same card he states that he will leave again this summer. WSC NO comes next and is the only other making the BPL. WSBAC has been having luck with DX on 14,000 ke. WSNP, the faith- ful, turns in a round 71. His name is North, and he says NP stands for North Pole. WSDDF was home for a week and earned 56 messages. WSAPC blew most of his filter con- densers, and says too many skeds are being cancelled. WSCFT reports activity with DX. WSHH reports condi- tions on 700 ke. rotten in daylight. WSBKM says he is using a couple of 866s and gets xtal reports, also that WSCIY has fallen for the women. Hi. WSDU is ex-W9GKI, and will be an ORS as soon as I can get around to him. Welcome, OM. WS8AQ won the Sweepstakes trophy for Ohio. Congrats, OM. WSBDU is another who is anxious for ORS. W8TK deplores the lack of traffic and asks how he can make the BPL without it. WSCSS built an a.c. receiver and says it’s FB. WSADU again kicks through with a total. We'll make a traffic “‘amn”"’ out of her yet. Hi. WSATL says Cleveland has gone ‘phone. WSDPF reports a steady schedule with a YL, but expects to do a lot of brass pounding during his vacation. We are glad to hear that WSBBR is improving tho he will not be able to do much on the air for some time yet. WSCX also asks about his ORS appointment as he wants to buy a pin. Buy it, OM, you've earned it, and will get the appointment soon. WSBBH has a good crystal rig going and is in the market for schedules. WSARW is run- ning two sets now, one on ‘phone. WSEJ is busy installing Police Radio System. WSADS has been too busy with work to be on much. WSDIH has been experimenting with low power ‘phone. WSD DQ is to have some new ops soon when school starts up again. WSDBK was on the air only a few days, but is now going strong. WSIF is going to install MOPA and perhaps xtal later on. WSBZL sent in a nice bunch of signal reports. WSCRI is pretty busy with school, but has a little time for RM work. WSLI has not had much time for traffic either, but expects to do things when school lets up. WSPL reports things pretty dead. Do you know that for the February-March period, 34 out of 35 stations re- ported with traffic, that we led the Division, and Ohio is second in the list? FB very, and keep up the good work. WSBYN is off the air for the present but expects to be on with something, somehow soon. Plans are under way for the convention here at Dayton sometime this fall, probably in October Traffic: WSR) 458, WSCNO 282, WSBAC 92, WSBYN 86, WSNP 71, WSDDF 56, WSAPC 43, WSCFT 33, WSHH 31, W8SBKM 30, WSDU 25, WSAQ 22, WSBDU 22, W8TK 22, WSCSS 20, WSADU 18, WSATL 18, WSDPF 18, WSBBR 12, W8SCX 11, WSBBH 10, W8SARW 9, WSEJ 8 WSADS 7, WSDILH 4, WDDQ 3, WDBK 3, WSIF 2.

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onth und BCL, trouble is on 14,000 most ng was detailed on special duty, manicur- W9YBNF and W9DBC operate oc- be on the lakes this is on 14,000 in Minneapolis and getting l says that ex-W9BCN is now W7CE of sends 73s to the Minn. gang. He is WYFLE is too busy to be on much. x 3 xmitters for all bands 4 are all on regularly. W9DGE is back has been working good DX. 5618, W9OBN 528, W9DRG 315, W9BNN W9GHO 14, W9DSH , W9AIR 5, W9BLG 4, W9DBC 3, ' W9DGE 4, W9YC 53, W9EFK 1 MINNESOTA — SCM, sual summer traffic slump seems to be s report no traffic and inactivity. W9GGQ ib at the Park Rapids High School with W9BHH works DX while not han- m plains about poor signals and fading s on 14 me. regularly. W9DPB kept a nd will be on during the summer, with W9ADS and W9CIY ntrol and more power. W9CTW has a es it very little. WOBVH is inactive due itstanding event of the month was the Arrowhead Radio Amateurs at Du- ty gang turned out in fine style and the The Arrowhead Radio Ama- ngratulated on the way they put it over. osandy kept all spellbound and was n price alone. W9DOQ is now at his shes to thank W9CIY and W9ADS for W 9OBBL is using a new 852 W9FFD is trying to work DX itter. cess Paul » luck W9BHH 23, W9EHI 20, W9CKI 13, H 6, W9CTW 4, W9DPB 1, W9DO0Q 1 SCM, B. S. Warner, W9DYV — pply went south, so he thinks that he will Better try again, OM. W9BVF reports W9DM has moved to a new loca- had time to install his zepp yet. W9DGS PM and reports that he blew his plate C. N. Crapo, W9VD - meter band pretty consistently lately, und trying to get a WAC. W9DTK is ver. W9BW2Z is keeping four schedules, e guy that has been using his call, and off- says DX has been good t his totals seems to confirm it ruined a plate transformer /, has installed rectobulbs with excel- ll be on 20 during the summer. W9OT 10 and 20 has gone haywire t.F. screen grid receiver and will be ow on. Five new fellows are going W9CBF, wscca, W9DTK 65, EXBWZ 34, W9SO 27 W9O0T 5, W9VD 4, W9DJK 186. DAKOTA DIVISION INNESOTA hamfest the 19th of April with a large attend- AIR, W9ODHP and W9EFK from So. Minn coupled with perfect weather, a had by all ports here every month n Sunday morning get-togethers on ings at the Duluth Banquet W9COS leads the total, closely followed by W9BN and f Heron Lake is going on the road for ll be on stronger this fall christened his new xmitter. W9GHO is Hi. W9DSH is chief at yur own Division SCM season started It is a great pleasure to sit OST JUNE, 1930 transformer. W9CRL sends in a report for the first time and states that he will apply for an ORS ticket in the very near future. W9AAN is using 2 watt output from four 201A’ jp push-pull Hartley, Heising mod. When this report is in print. the new SCM will be in charge of this section, and I want to take this opportunity to thank all the ORS members in this section for the splendid coéperation which has been given me, and I hope you will continue to give the newly elected SCM the very best of support; as that is what makes a good section in any division. Traffic: WOBVF 112, W9DGS 73, W9FCA 29, W9CRL 10, W9AAN 6 SOUTH DAKOTA — SCM, Dwight M. Pasek, W9DGR The reports dwindle with the coming of good weather W9DNS and W?DB are the only stations to report. W9DRB reports lots of DX on 14 me. now and QRN on 3.5 me. Heis keeping South Dakota on the A-A map, however, maintain- ing skeds with WODGR, W9CIR and W9YDNS. W9DNs still runs his Minneapolis schedule regularly and has a nice traffic report. He also reports WODIY and W9DQS busy building equipment. W9DNS is looking for a sked west! W9CIR in Mitchell is on 3.5 mc. every evening and is one of the regular A-A stations Traflic: W9DNS 165, W9DB 7, W9DGR 2. DELTA DIVISION RKANSAS SCM, Henry E. Velte, W5ABI — We A have reports from several new stations which we are very glad to get. W5BM1I, using one 201A tube with 180 volts on the plate, has worked 7 U.S. districts and VE3 and VE4. His portable call is WOSBNQ. W5ACM expects to soon be on the four upper bands with both CW and ‘phone W5BDD and W5BLG are both proud fathers of new sons Congratulations, OMs. W5IQ is back on the air after having to tear down and move. W5HN is increasing power and has been busy getting a new ham station on the air. FB, OM W5LV is on 7 and 14 me. He has been appointed our new Route Manager. If you want skeds, drop him a line and he will try and arrange them for you. Address is P. O. Box 672 Dermott, Ark. W5BDB has a new MOPA transmitter. He has skeds with W5ALY and W5AQY. W5AMM is a new station in Texarkana and expects to be on soon. Remember gang, this report depends on you and the more reports, the bigger this repo t. So let em come Traffic: W5ABI 18, W5HN 12, W5LV 6, W5BDB 3. LOUISIANA — SCM, Frank Watts, Jr., WOWF — The gang seems to have awakened to the fact that it takes are port to build up our section. The Monroe fellows have organ- ized the Pelican Wireless Club and are going to have a FB organization. Good luck to you, boys. W5BHV is back with us after a trip to sea. No, he wasn't an op — he was cook W5YW reports that the ops there are suffering from spring fever. W5ANA wishes skeds with New Orleans. W5BCMis now working on 14,000 ke. W5BJA ordered an 852 and it came with a bum plate. W5RR is pounding out with a 50- watter now. Watch him go. WS5WF was off the air for a few days, as the rectifier went west. Now come on, fellows, with a larger report next month. This SCM report is just what you make it. I can’t make a good report if I don’t get a report from you. Traffic: WS5WF 92, W5YW 62, W5ANA 27, W5PG 8 W5BHV 7. MISSISSIPPI SCM, June W. Gullett, W5AKP— W5AZV reports that amateur radio is on the boom in Jack- son, and he says that two of his code class now have licenses and their calls are WS5BNW and W5BNX. W5AZV's code classes have presented him with a crystal, so it looks a though he will try a crystal-controlled transmitter soon W5BME is the call of the amateur transmitter at WJDX W5AAP operates on 7160 ke. and has a schedule with the SCM daily at 1:45p.m. W5SAWP is putting a new transmitter on the air in the 7000-ke. band May Ist. W5A.J has just had his license renewed. W5AOM is now in the 14,000-ke. band and has worked 40 states, all VE’s, X, YS, Canal Zone, OA LU, 2 CT’s and 2VK's and has hopes of working Asia and Africa with his 210. W5A KP is having trouble getting two “S”’ tubes that will work together Traffic: W5AKP 84, W5AZY 77, W5AAP 40, W5AWP 16 TENNESSEE — SCM, James B. Witt, W4SP — I hope we can do as well during the summer months as we have ou: sco at | act. W2 bor by if] ut lan stat wor W6 rety £00

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2, 1930 time and very near 201A's in S 1n print I want to ers in this Pen given ly elected 28 & good W9CRI W9DGR weather t. W9DI I He is naintain- W9DNs 1Aa8 & hice 1S busy ced west | is one of BI — We h we are ube with and VE3 xpects t d *phone lew sons er having r and has FB, OM our new e and he Box 672 itter. He is @ new member ports, the ye organ- uve a FB ack with as cook m spring »BCM is 2 and it ith a 50- for a few we, witd ust what a report V5PG 8 AKP — in Jack- : licenses V's code looks a8 er soon WJDX with the nemitter just had cc. band ne, OA Asia and Ling two LWP 16 ~ I hope we have JunE, 1930 during the winter. Our state seems to be getting lined up pretty well, and let's keep it that way, fellows. W4KH has worked a lot of DX and has also sent 4 rectobulbs west. W4RP sent in the best report again this month and he was off the air ten days. FB, OM. W4AFS says one of his 50- watters went west. W4VK sends in a nice report and says he’s going down on 20 for the summer. W4CW has moved and is putting in new push-pull xmitter using two 210's. Some stations that have been reporting failed to send in a report this time. Traff W4RP 213, W4AFS 72, W4VK 51, W4FR 26, W4SP 13, W4AJQ 10, W4CW 5, W4ABR 3, W4KH 8. HUDSON DIVISION T' IRTHERN NEW JERSEY — SCM, A. G. Wester, NX W2WR — Traffic took another jump and your + SCM hopes that it will continue over the summer months. Fine interest is being shown by non ORS. Their reports are always welcome. W2WR is closed down for a mplete overhauling. W2JF makes the BPL. W2AOS is busy with Army skeds. W2APU bemoans the loss of another 210. W2ANH and W2AVQ are doing fine work on 14 me. W2CW K is getting a Vibroplex for his Pyrex arm. W2BME sfeeling with push-pull. W2UK, W2BJS and W2AIN are playing with 3500-ke. fone. W2JT is building a MOPA for 7me. W2BAU is doing fine DX work on 7 mc. The Raritan Valley Radio Club of New Brunswick is holding a banquet n June 14th. Anybody interested should write to W2BJS. W2JC has a strong drive on to keep amateurs within the bands. W2BDF just returned from Haiti as chief on the 88. Padill, W2CJX worked all continents on April 5th. W2BHW and W2CDQ are new in Ridgewood. W2BY is having fine results on 14 mc. W2BIR is still finding it hard to get time on the air. W2IS is back on the air. W2CO is installing a new MOPA. W2BZB has been experimenting with fone and xtals. W2BYT is working good DX on both Tand 14 me. W2CXL as usual leads the section in traffic. W2AUP passed the century mark in traffic. W2BPY is trying to get settled on some small gap in the 7-mc. band. W2DV has cured all his 14 mc. troubles. W2PC is in line for an ORS. W2AGB sends in his first report in years. Traffic: W2WR 17, W2JF 134, W2ACS 46, W2CWK 31, W2C 2, W2CJX 32, W2BIR 2, W2CXL 370, W2AUP 104, W2BPY 4, W2DV 25, W2PC 44, W2AGB 6. NEW YORK CITY AND LONG ISLAND — Acting 8CM, V. T. Kenney, W2BGO Reports are much better, but traffic is still very light. Too bad we did not receive any report from our prize traffic station W2SC this month, but we assume that regular Army work is taking all the spare time that the ops have as they are short-handed. Manhattan: W2AFO leads his boro and is now using rystal control on 7030 ke. and keeping 15 skeds a week. W2BDJ, one of the boys who helps keep W2BWI, 27th Special Troops’ station on the air, is doing better in traffic work lately. W2ABU is handling traffic in the form of rifle sores for the N. Y. Stock Exchange. W2BXW is working DX on 7095 ke. and is getting a radio club together in Yorkville; anyone interested will be supplied with full nformation by getting in touch with either him or W2ABU. W2AOY has an MOPA going and is still busy with studies at Columbia. W2JV, *‘ Doc’ Berg, is beginning to take an ative part in traffic. W2BQK works exclusively on the 7-me. bend, but cannot get much traffic. W20V is trying 10 meters and is looking for skeds on that band. W2AVIx goes on the inactive list due to business and studies W2BZN, a new ham, is using a 510 ina TPTG. Bronx: This boro comes through with some good totals this month led by W2BPQ, our route manager. W2AII is working plenty f DX as well as handling traffic, although he recently blew ut his 210. W2CYX keeps three skeds a week with Eng- land, France and Germany and Dolly, the YL op at that station, is working hard for a WAC. W2VG reports speedy work in getting a message to the coast via W9ACL and W6APA in 45 minutes. W2APV is ready for fone work on 2. W2AQG will be known also as W2CXW (portable); he ‘ays it will be impossible to reach his new antenna without & scaffold and a 40-foot ladder. W2AET has returned from Atlantic City where he reports having had a food time. Brooklyn: W2APK, a brand-new ORS, is eading; he QSP’d traffic from KH1DK (Blimp “ Defender”’ extension OST 13 to WLMK and QSO'd Spain). W2BO, that standard fre- quency station, is back in town again and hanging up a nice total. W2A RQ is keeping eight skeds a week and reports a new YL arrived at his home recently. W2PF, 2nd Corps Area Radio Aide, is handling plenty of Army traffic and keeping his Army skeds regularly. W2U D is back in Brook- lyn after spending the winter in Chicago and St. Louis W2BRB is helping W2CLA get a new high-powered CC job on the air. W2BIV will soon be using crystal control on all bands; he has just completed W2APQ, the station at Long Island University, and has it perking nicely. W2CCD can be heard on 20 with a d.c. note. W2ATZ has returned from the expedition to the caves of New Mexico, but ex- pects to leave for Europe very soon. W2BEV, a new ORS, is on 20 now and stepping out some, too. Long Island W2AVP, L. I. RM, leads that part of the section, as usual, and is having better luck getting traffic into New York City. W2BNX is working hard for an Asian QSO so he can get a WAC. W2AYM, the Boy Scout station, has been forced to cancel all skeds, but will resume that work in the near future lraffic: Manhattan: W2AFO 36, W2BDJ 22, W2JV 23, W2ABU 22, W2BXW 19, W2A0Y 9, W2BQK 3, W2JV 2, W2AVK 1. Bronx: W2BPQ 104, W2BGO 58, W2AIT 51, W2CYX 48, W2VG 30, W2APV 21, W2AQG 20, W2AET 14. Brooklyn: W2APK 143, W2BO 67, W2ARQ 61, W2PF 16, W2BIV 23, W2CCD 14, W2ATZ 10, W2BEV 5. Long Island: W2AVP 8t, W2BNX 8, W2BFC 1. EASTERN NEW YORK—SCM, H. J. Rosenthal, W2QI -Some very good traffic totals were handed in this month, and it is hoped that the good work will keep up With one exception, the big reports are coming from the men handling foreign schedules, so here is an idea for anyone looking for messages to handle. W2QN now has a reliable sked with Rio working "phone and CW with that point W2FN has a daily schedule with the Virgin Islands and says his messages originate from the sailors on the U. S. fleet there on war maneuvers. W2QU is still keeping traffic mov- ing between New Rochelle and Nicaragua. W2BC ran the transmitter at the Port Chester Radio Fair and built up a big total from that source. W2LU handled a large number of domestic messages, and reports that the Schenectady Amateur Radio Association now has a membership of 75. W2BUW is also handling Virgin Island traffic. W2BWV, a doctor, writes that he pushed traffic between operations at the hospital and is moving to the eighth district next month. W2ACB now has a crystal working in 20 meters W2RD finally has his crystal phone set going on 80 meters and also has a CW set for 40. W2ALI says Hopewell Junc- tion is so far away from anything there just isn’t any news around his location. W2BJA suggests that someone resur- rect an old spark transmitter and call the off-wave stations to let them know about their wrong frequency. W2ANV reports two new Army Amateur stations in the district, namely W2SJ and WSDSA. The AA work is progressing nicely in the district, and W2ANV turned in a very nice traffic total. W2ACY deserted 80 meters and is trying 29 and 10 for a change. W2AYK has been away on vacation. W2BKN reports great DX; he worked his own town the long way around the world. Hi. W2BAI blew his 852 winning the third prize in the message contest for the country. W2UO nearly had his license cancelled when some bootleg station worked off-wave using his call. About ten of the ORS have not been sending in their monthly reports and, unless explanations are received before next month, there are going to be a flock of cancellations soon. Many of the hams who belong to the Naval Amateur Reserve have spent two weeks on active duty and all report they enjoyed it immensely and learned a lot of Navy procedure during their stay at headquarters rraffic: W2BC 626, W2QU 592, W2FN 463, W2BUW 264, W2LU 233, W2QN 157, W2ANV 104, W2BWV 41, W2ALI 33, W2BJA 28, W2RD 25, W2ACB 15, W2AYK 3, W2BKN 3, W2U0 16. MIDWEST DIVISION OWA —SCM, H. W. Kerr, W9DZW — Migration has I been in progress for a week or more from here to other bands, to spring and summer labor, but look at the bunch of reports. Our RM tops the list and is in the BPL

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OST JUNE, 1939 W9FZO QSO'd a K6 on 7100 ke. W9DNZ W9DPO is a new ham at Malvern. I nes are leaving Nic. soon, 80 it will traffic for him. Fine report, W9ACL. nagain toadd another stage. W9FFD . W9ELYV is rebuilding and im- supply of W9TA, the Tri-State Portable » report. W9FUD says there are two Lost: two skeds, please return to up at Perkins Corners; motorists, there. W9GKF has our thanks for * reputation. W9CK is heard again with We want WYALI essages on last month's report which W9FYC wants to know if it is out wa City has changed its name to the hibited at the Mecca Week Exhibition. p of W9AWA, the club sponsored a n at the Iowa City Better Homes Show. 243, W9FZO 106, WODNZ 89, WOBCA 9, WOFUD 32, W9EOP 24, W9DUI . Diehl, W9BYG — W9QY work at this time to radio much. ell this time and we are tickled to see it, » having a run of business and traffic W9EBF is still at it, W9FAM blew a tire and had to slow Ibs now. W9DI is back at it again and W9DI is having exams and had to rashort time. W9BOQ is very busy on W9EAQ is a new station in Marquette enting with 28 me. He will be on 14 me. » busy on his railroad now » has time to be on. W9CGE and , W9DFR 3, W9DVR 5, W9EBF 13, 23, W9OBBS 5, W9CGE 1, W9DFF 6. the RM. W9BEZ is working lots of vy QRA. W9DFY wants the gang to listen * W9BWYV worked his nd the coming of spring are having their W9CET has been experimenting with I reports for the first time. A new MOPA n at W9CKV. W9SS says his rig went peka gang are busy with a new USNR nit commander. WOFKD is going again at W9EUX has been out of town all seems to have spring fever. W9CV is 000-ke. fone. W9F XY is on week-ends. is reported at Valley Falls. W9ESL kinds of antennas. W9CFN reports by is planning the Division Convention 148, WOBEZ 43, WODFY 40, WOBWV , W9FKD 6, WOFXY Laizure, WORR — W9FTA tis and is a new OBS. WYZK was next W9BMU is trying to snag Asia for his i has a new 4.c. receiver. W9AMR tinent toward the WAC. W9DYJ is a new I J fone going FB; his commercial ticket. W9FTA wrote a W9BGN reports for St n in Rolla with a 210. W9DUM is the i W9DKG wants all visitors to WOBJA cancelled all skeds after the new supply came out and went off the air W9CJB has his Sweepstakes Certificate W9EPX joined the U.S.N.R W9CDU and W9EFR are putting in xtal on 7 me. WOFCR is a new Nevada station. WYDHN is rebuilding. W9ENP was busy on State Highway work. W9ASV draws congray on his new commercial ticket. W9ECS has moved to Kansgs City temporarily and is camping at WY9DQN. W9AKZ leg the traffic in K. C. W9GCL is another out-state station t remove to K. C. this month. W9BMA has some plans for new equipment by next fall. WODPA is handling traffe regularly and reports W9CSK, another new K. C. station W9GGI has been on occasionally. WORR has been of since the first of the month due to job QRM and the ney d. c. regulations. W9CFL has been putting in considerable time at the Naval Reserve Armory preparing quarters for the U.S.N.R. gang to hold their instruction classes. Traffic: W9BMU 13, W9PW 49, WY8AMR 12, W9DY 11, W9ZK-AAU 55, W9GHG 1, W9DUD 12, W9FTA 7% W9BGN 31, W9DKG 7, W9BJA 262, W9CJB 18, W9EPX 4, W9CDU 42, W9ENF 8 W9DQN 143, W9AKZ 142 W9GCL 21, W9BMA 44, W9DPA 71, W9RR 5, WOBIJA (Feb-Mar.) 202. NEW ENGLAND DIVISION ONNECTICUT — SCM, F. T. Ells, Jr., W1ICTI- C WIBHM keeps a daily schedule with FSKZ and has been QSO over 40 foreigners, including New Zealand W1JN has time for only one schedule, which is with W1AFB WITD finds 3500 ke. somewhat freaky. Your sigs sound OK here, OM. W1HQ says most of his traffic was on 14 me WI1BOD reports a good total and lots of DX. He Qs0" ZL3AS during an eclipse of the moon with an R7 report from ZL3AS. WIABL says operating time has been cut down, but experimenting is going on quite actively. An xtal will be installed soon. WIUE and WICTB changed their QRA’s. W1AMQ is working lots of DX and gets xtai reports W1BJK is back with us again and is on 3500 ke. a coupled nights a week. W1AFB sends in a nice total and promisess d.c. note at once. WIATW reports a new ham, WIBNF in New Milford. Welcome, OM. W1ATG has been busy with the Naval Reserve station, WICAL, at Bridgeport. W1RP has a new Chevvy sport coupe and the YLs keep him QRI WI1CJD is in Europe. W1AJB reports by radio. W1VB has a nice wallop with his push-pull xmitter. W1AMG has been busy looking for new quarters for the N. H. Radio Club WI1AFG, a new station in Goodyear, sends in a fine total for a starter and says he will make the BPL next time. FB.A new station in Greenwich, WLAVB, was worked by WICTI Welcome, OM. W1ADW won first prize in the Sweepstakes Contest. W1BWM is having trouble with bad power leaks which accounts for his low total. W1ZL reports working G6LL during the R.S.G.B. 28-me. tests. Several of the old standbys were logged on 3500 ke. last CT nite. This is an excellent time to QSO the SCM and report your traffic totals by radio. Fifteenth of every month on 3500 ke. after 7:00 p.m. Let's go, gang! Traffic: WI1BHM 28, W1JN 22, WITD 5, W1HQ ll WIBOD 65, W1ABL 59, W1AMQ 25, WIBJK 6, W1AFB 66, W1ATW 33, WIBWM 1, WLRP 15, W1AJB 11, W1VB 15, W1AMG 14, WIAFG 38, WICTI 34, WIMK 820 MAINE — SCM, G. C. Brown, WI1AQL k-verybody reports a big slump in traffic this month due to a bad spelldi radio weather and various other reasons. It seems to be up to the gang to originate some worthwhile traffic and get some reliable schedules and then settle down with purpose of reviving the QSP idea. Please send in a report each month whether you handle any traffic or not. The two clubs d Portland and Bangor are doing fine business in the way d new members, also the Elm City boys report fine progress 08 the Convention this summer. We have a few new calls aga? this month. — WIBE, the new headquarters for the At gusta gang, WIAID “Dick” Green, Bangor; WIAIK ‘Chet’? Kennedy, Bangor; and W1JB, the headquarter station of the Fleet Reserve and Communication Reserved Portland. A word might be added about those who arf operating transmitters without the proper licenses. This dangerous business. It is better to send in and get a te porary permit and be on the safe side. Lt. Comdr. F. J Bailey, C-F, U.S.N.R., of Boston, recently visited Maine and assisted by Section Commander Fred Best held enlist ment parties at Augusta and Bangor. A goodly number d men passed the physical examination and were made mei

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E, 1930 . WOFCR . W9ENP 3 CONngTats to Kansas 9A KZ led station t plans for ng traffic Statior been of 1 the ney nsiderable arters for , W9DY OFTA 78 , W9EPX AKZ 142 », WOBJA VICTI- Z and has y Ze aland WI1AFB ig8 sound on lin le Qxi {7 report been cut y. An xtal wed their ai reports couple of romises 8 IBNF ia yusy with ‘t. WIRP Lim QRI V1VB has has beer dio Club p total for 1e. FBLA -WI1CTI eepstakes wer leaks } working of the old This is an ur trafh | ke. after "1HQ 11 WIAFB 1, W1VB 820 very body id spell of to be up : and get 1 purpose ch montd _ clubs a 1e way of ogress 02 alls agall the Av WIAIK iquarter eserve of who are s. This! et a tel dr. F. J “i Maine id enlist umber d ide mem June, 1930 bers of the U.S.N.R. WIANH seems to be high man this month. FB. WIAFA says he is on with a new 852 now Wi1CDX reports that he has a portable station in Portland WIQH reports bad weather conditions this month. W1FQ was a recent visitor in Boston, his trip being associated with Reserve Signal Corps in which he holds the Commission of First Lieutenant. W1BFZ reports bad power leaks in his section. WLAHY reports that he is unable to make schedules with any of the Maine gang. W1LAUR says that he is more or less busy with the U.S.N.R Traffic: WIANH 51, WIBE 47, WIAFA 42, WLICDX 31, WIQH 28, WIFQ 22, WI1KQ 19, WIBFZ 17, W1AQL 17, WIALR 6, WIBE 25 EASTERN MASSACHUSETTS SCM, M. W. Weeks, WIWV — In spite of approaching summer weather and less favorable conditions, section traffic WICMZ, after two months turns in more evidence of his activity with a large total. Five stations make the BPL, WICMZ, WITL, WIRV, WIBXB and WIBKR. WITL expects soon to leave for Newfoundland where he hopes to be heard from VOSAE. WIRY spent a few days in the hospital for spring over- hauling preparatory to a commercial job. Navy drill traffic helped WIBKKR to run up a good total, aided by his OW, WiIDsS. WLASI is QRL hunting for a new job. W1QZ is still experimenting with push-pull circuits. WLWV took a six day auto trip visiting stations in Worcester, Springfield, Danbury, Hartford, New Haven and around New York City. W1WU is building an MOPA in his spare time, but is working 14 hours a day in his bakery, so progress is slow. WILQ expects soon to be back on 3500, but has been DXing on 14,000. W1CMZ is on 3500 at night and on 7000 during the day and is also working fone. W1LAAT is in the U.S.N.R. and unit commander for Salem. W1LACH is still plugging along on 3500 keeping the usual skeds, including one with WIMK. W1LACA still finds a little DX on 14 me WIKY has found little time for radio lately on account of business and sickness in the family. W1AGS got smashed up in an auto accident and has been in the hospital, so is off the air temporarily. W1BZQ is on 7000 during early morning hours, but expects a change soon. WICCP, WICHR and WICQN are three new stations who begin reporting traffic almost as soon as they got on the air. We hope there will be more like these. W1LAHYV is back on the air with a new call, W1ZO. W1KH is using the new DeForest 510's and reports greater output and steadier signals. W 1A NK reports again this month and is looking for an ORS. All are reminded that the new amateur regulations call for d.c. notes, and it is hoped that from now on the RAC note will vanish with a minimum of grief in regulation enforcement. W1BXB has been on a 10-day trip on a new cruiser. Traffic: WLCMZ 413, WITL 212, WLRV 153, WLWV IO, WIBKR 123, WLIACH 95, WI1LM 79, WLBZQ 52, WIACA 44, WLASI 37, WLAAT 27, WLAZE 26, WLWU 25, WIANK 24, WLKH 21, W1QZ 16, W1LQ 15, WICQN 9, WICCP 5, WICHR 4, WIKY 2, WIBLD 2, WIBXB 202 NEW HAMPSHIRE SCM, V. W. Hodge, W1ATJ — Most of the active stations reported this month, which was very FB, gang. The fellows at Dartmouth, W1LAOC, WIWH and W18MS pounded out a bunch of traffic, using the call WIET. A xtal rig is planned. Doc Steady, WIBST, gets a little time at the key between osteopathic victims! The new crystal rig at Phillips-:xeter will be going soon. 14 me. is claiming W11P’s spare time. Outside work is also claiming W1AEF, but he expects to be back on 3940 soon. Our new ORS, WICNR, is building a new Zepp WICDT will be on 14 me. with an 852 soon. W1AUY keeps a bunch of skeds and has organized a fone relay chain with WIBMB. Watch for W1CCM, Concord, who is just start- ing. WLAPK is keeping fone skeds and handling traffic WIBFT is experimenting on 20 mc. with various antennas and reports very fine DX. WLU N sold his receiver to W1AJF and is building a new one. W1MB has moved to Charles- town and is off the air for a while. W1 BAC is a new ham in Claremont. Ex-W1CAZ of the same town is cruising the briny as ship op Traffic: WLEH 70, WLIP 21, WICOW 20, WIBFT 14, WIAPK 14, WIAUY 14, WLAOC 13, WICDT 6, WLATJ shows no let up. absence from these columns, new 44 kw 4,W1CNR 21, WI1AEF 1. OST 15 VERMONT —SCM, Clayton Paulette, WIIT W1L1AOO has blown his filter condensers. W1BD says his High C frequency meter holds its calibration fine. A new receiver is in order next. WICGX makes the BPL again month. FB OM. He reports two new stations WIBAS, who is old W1IBCK located at the Armory at Brattleboro, Vt., and the other is WIATI, Harry Page of Hinesburg, Vt. Traffic: W1IT 5, W1AO00 10, WI1BD 35, W1ICGX 200 RHODE ISLAND SCM, C. N. Kraus, WIBCR — WI1BCR is on 14 me. with c.w. W1MO was recently QSO with G2KF. W1BML has just returned from Prince Edward Islands. WLAWE reported direct to HQs. The Radio Club of Rhode Island plans to hold its annual banquet soon All amateurs are invited. The 8.C.M. would like to hear from some of the O.R.S. in Newport, Woonsocket and Providence. We are looking for a good O.R.8. in Westerly. How about it? rraffic: WIBCR 20, WIMO 14, WI1AWE 3. WESTERN MASSACHUSETTS —SCM, Dr. J. A. Tessmer, W1UM W LAZD has a new junior op. The YL of the Berkshire Pounders, W1AJJ, and W1AZW will be married next month. W1AMZ was home from college for a week and handled some traffic. W1ZA is busy keeping six skeds. W1 BNI. is lamenting the loss of a 203A. W1DRis keeping traffic moving over Westfield way. W1JV has deserted 14 mc. on Sundays for the golf links. Leo has been teaching the old Scotch game to WIACV, WIACW and W LADO. W1AQ™M also does considerable DX on the links WI1ASU has recently been appointed an Ensign in the U.S.N.R. W1ZB has a 14-mc. phone rig perking FB W1ADO is busy rebuilding. W1BKM-W1BEG is bothered with line voltage fluctuations and says he doesn't eppreciate the power company's efforts to list his call in Prehistoric Signals. Hi. WIBVR has been elected president of the Springfield Radio Association. The Worcester Radio Asso- ciation won a Crosley 8-tube BCL receiver at the A.R.R.L. Convention. WiIBKF has deserted the prehistoric signals ranks at last. Judging from the prizes that WiBMM won at the Convention, Smitty ought to have quite a broad- casting station on the air. WINS and W1BZJ have formed the I-K Radio Engineering Laboratories. The A.R.R.L. Convention at Worcester was a 100% success and was thoroughly enjoyed by all who attended. The Worcester Radio Association wishes to take this opportunity to thank the many amateurs for their patronage and to thank the manufacturers who so generously donated over $1500 worth of prizes. Traffic: W1AZD 261, W1AMZ 10, WiBKM-W1BEG 12, WIBVR 33, W1BZJ 24, W1ZA 107, WIBNL 1, W1DR 18, NORTHWESTERN DIVISION ONTANA—SCM, O. W. Viers, W7AAT — W7AAW M leads the section this month. W7DD is still going on 3500-ke. "phone and wants to know who has heard him. W7AKO, W7AEM, W7MI and W7JC are new Billings stations. W7MI operates the B.C. station, KGHL, there. W7AKO is a Morse operator. W7AAT has three trans- mitters on now Traffic: W7AAW 65, W7AAT 40, W7DD 20. OREGON SCM, W. 8. Claypool, W7UN — W7AAR of Eugene is high man in traffic and is acting as State Net Control in the Army Amateur Net. W7ALM reports poor weather conditions. W7AHJ, the OW opr., has a nice report. Much hamfesting is going on in the Coos Bay cities. W7 AMF has a fine report. W7PE reports poor daytime reception. W7QY reports good conditions on 14 mc. W7WL has a sked with W6CGJ which netted him a few. W7EC is increasing power to one 210. W7AJW has been rather dormant since the Sweepstakes Contest. That certificate looks nice on the Club shack wall. W7WR and W7EO report. Traffic: W7AAR 101, W7ALM 98, W7AHJ 41, W7AJX 6, W7AMF 28, W7PE 17, W7QY 15, W7WL 12, W7EO 5, W7EC 2, W7AJW 1, W7AOF 70, W7TO 7. WASHINGTON —SCM, Eugene A. Piety, W7ACS — W70J says that he is regusted with radio. W7TK is the busiest of the fellows in Everett with W7ACY close behind him. W7NR is too busy to be on the air much. Farming work keeps W7AFD from doing anything spectacular. The Alaskans are back now and W7TX expects to start his this Brass

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hree fellows report for the first time this re W7AJS from Centralia, W7FK from V7AFX from Snohomish. Fine work, fellows s chickens and farm work. In sending Yakima, W7ANP states that they have tive hams there and fourteen of their club 4.R.R.L. W7OV sends in a very newsy k again and is looking for all of his old isy working at KMO. The Radio Club their new club house, will be on with FO is back in town working for the tele- Don't forget your reports next month, W7TK 24, W7ACY 22, W70V 14, D 11, W7AFX 11, W7FJ 9, W7AJS 8, 7, W7NR 6, W7IG 2. PACIFIC DIVISION : Acting SCM, C. A. Nichols, W6ASM | ving make the BPL this month and en a rousing cheer: WODEP, W6WA, D, W6QP, W6BZY, WGAOA, W6FE RS, leads the section in traffic, and in sa jeweler. FB. The A.R.R.C, visited ian Telephone Co. and was shown raph Department. A demonstration he gang were taken through the Ex- n the operation and care of telephones he A.R.R.C. gang journeyed to Bakers- th, and were the guests of the U.S.N.R rsfield. Speaking for all of them, I can d a better time in our lives. They have clubs in Southern California. The Wave Club continues to hold meetings at 1 have been having some interesting W6KA. The Long Beach gang has not sent but we think they are still meeting in r the jail. The Tri-Country Club is spon- banquet in June. W6ELZ is going xtal Fords. W6ID has been busy with work t KMIC now. W6BFI wants to know all night. W6EQF, the SCM, is in o, and continues to get his signals into and W6BRO are his two main contact IPH doesn't answer you, fellows, you t he is too busy with business. W6ZZA ch now. W6AZL is building a new re- QSO SSLXE, who was 125 miles off rts death of his Kress 250. Hi. WOWO is Zepp. W6ABK is now using xtal control ng a Sweepstakes Contest certificate 1 into the East Bay section and taken t et with him. Good luck, OM. W6BVT ystal much better than the old one e WAC in 13 hours and reports DX good rts working South Americans and chew- W6FJ won traffic contest between his es nice set. W6DOZ, a new ORS, was FB. W6KGF shot his 210's, but con- W6ET) is the new chief Route Manager reen-grid receiver. W6EA was heard in » rebuilt W6EX fifty. W6TE has been ege exams. W6EAF reports that replace- have cost $1.32 for the last two years going strong. W6DYJ likes current SA has trouble with power leaks. W6FE IPH. W6BZY says that his bug went raffic went down. W6QP says all skeds i his total will be higher next month e Army net is going good and wants more t. W6WA is the new Route Manager for lso president of the club there. W6BC K leas that they might own an xtal some r care of the Long Beach end of a chess ntina and Long Beach. This is being and the Argentina station is LU3FA r some of the press from IPH and 100-word message. W6ASM has been rk but had time to go up to Bakersfield W6UJ is using a portable to keep skeds OST JUNE, 1930 with while rebuilding his other transmitter into crystal control. Fellows, let’s keep up the good work and handle, little more traffic. We could also use some more ORS W6BXR took the fifth step and was married, April 5th Good luck, OM. Traffic: W6DEP 401, WOWA 346, WOAKW 330, W6AKD , 301, W6QP 203, W6BZY 202, W6AOA 154, W6DLI 141, W6ETJ 136, W6AOB 119, W6LN 91, W6DQV 90, W6FE 89, W6ESA 88, W6UJ 84, W6DYJ 72, W6ZBJ 62, W6BCK 60, W6DVA 56, W6BZR 46, W6EAF 45, W6ENH 4 W6CGY 40, W6EKE 28, W6DY K 27, W6ETN 25, W6EQD 24, W6EA 18, W6CXW 13, W6OF 20, W6CUK 19, W6BGPF 18, W6DOZ 17, W6FJ 14, WGAWY 14, W6ABL13, W 6ENQ 10, W6CUH 9, W6BVT 9, W6CIX 9, W6BUX 8, W6BRO 8, W6AM 6, W6WO 5, W6ABK 6, W6MA 4, W6BVZ 4, W6ACL 6, W6COT 3, WGERL 2, W6AZL 1, W6ASM 1, W6CZT 12 SANTA CLARA VALLEY SCM, F. J. Quement, W6NX — W6HM continues to be the main outlet for Trans-Pacific traffic. Quote from W6H M's report: “ These 382 messages all trans-pacific. The originated are messages that came to me by mail, airmail or telegraph. The de livered were all messages received from abroad, of course mostly P. I. and China.’’ It is doubted whether there is another amateur in the U.S. A. handling such a volume of important traffic. W6ALW made the BPL this month, maintaining a daily sked with W6UJ. W6YG has been con- sistently handling traffic, skeds with WOALX, W6DVD and W6DUI are responsible. WODQH, the RM, is handling many Army messages. W6JU complains of bad weather on all bands. W6BLT has a daily sked with WOBNH. W6BMW has been developing portable phone sets for State Fire Wardens. W6BAX QSO'd five Aussies and 2 Zedders on 28 me. with reports of being received in England and China FB. There is a rumor that the wedding bells will soon ring for W6BNH. Hi. W6BYH is now an OBS. W6DCP hasa S/W receiver now, and W6EEC is a new ORS. W6AME reports bad weather and that ““SL"’ is back as OP again W6NX is putting in xtal control for all bands except 5 meters. Stations desiring skeds should get in touch with RM W6DQH. Traffic: W6GHM 382, W6ALW 216, W6YG 136, W6DQH 55, W6JU 36, W6BLT 28, W6BMW 26, W6BAX 18, W6AME 7, W6EEC 5, W6BYH 3, W6BNH 1, W6NX8 HAWAII — Acting SCM, L. A. Walworth, K6CIB— K6EWB made the BPL in January but was not reported with his 208 total. He came forth with 271 this month for BPL again. K6CIB should have been listed in the BPL for his work during the month of December when he handled 223. Hawaii is so far from Hartford that divisional reports are old by the time QST7' brings them back so a local sheet “Hamaloha” is being tried as an experiment for three months. McKinley High School, former K6EAT, is on the air but is K6YAL now. K6EWB is by far the most active station this month and is applying for ORS, Official Ob- server, Route Manager appointments. K6DV and K6AVL are not far behind. Many of the civilian hams have suddenly revived and are asking for ORS Traffic: K6EWB 271, K6ALM 99, K6CIB 42, K6AVL 38, K6KB 32, K6ERO 9, KG6ERH 7, K6CB 6, K6ACW 2, K6EVW 40. EAST BAY—SCM, J. Walter Frates, W6CZR— W6EIB, the old reliable, is still in lead position for the section in traffic with a fine total secured from skeds with KACIM, VES5GT, K6DQQ and W6ASH. These skeds give a fine idea of the range and reliability of his very FB station. At the present time he is arranging a transmitter and booth during the meeting of the Redmen in Vallejo which should bring in a fine total for next month. He will be glad te handle any traffic for P. I., the Hawaiians, and Pacific Coast points. W6ASH is the second highest man in traffic, all secured with some early morning skeds with Pacific Coast sixes. WOALX’s totals have begun to creep up agala to the point they were when he won one of the individual cups in the L. A.-East Bay competition last year. In addition he is turning out commercial operators for the trans-Pacific vessels as fast as he can. Due to the immense amount of work on hand at the Marine Barracks at Mare Island, Babcock of W6A MW reports that he did not have the time to spend on radio last month. W6EDO is back ™

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, 1930 D Crystal handle 4 re ORS pril 5th W6AKD ILI 141 ), W6FE W6BCK INH 40 W6EQD W6BGF W6ENQ W6BRO 6BVZ 4, iASM 1, huement, itlet for These nessages The de f course there is lume of month een con VD and handling ather on fOBMW ate Fire lders on i China oon ring P hasa VGOAME ? again xcept 5 ith RM V6DQH AX 18, ONX8 CIB— eported ynth for 3PL for handled reports al sheet rw three } on the t active ial Ob- K6AVL iddenly K6AVL LCW 2, CZR— section ACIM, a hone ion, At | booth should vlad to Pacific traffic, Pacific D agalD ividual ar. In for the imense t Mare it have yack 1D JuNE, 1930 Pope Valley but is QRW work. WGEDK recently received his Signal Corps fiag from the War Department for his work with the First Pursuit Group flight last winter. WOBIW report that he has been trying 14 mc. with some success, but the band is erratic. W6CG M reports getting a card fron Germany and says he has been QSO with VK, KA and K6 stations with his low powered transmitter. W6BBM has never reported before, but his totals are very welcome and will be expected each month. W6RJ says he has been QSA4 in New Zealand on 3500, but that he has been devoting considerable of his time to OO work. WUBZU is pounding away at Concord, but is being kept busy by other radio work. WOBNG hands in a good total, considering the fact W6AUT reports " that he has not been reporting very long that WOBYS has returned from a Naval Reserve cruise and js on again with his 250-watter; that W6CZN has his screen-grid receiver working FB and that he, W6AUT, is sing a push pull TPTG with a U X210 on 7000 ke. WOBMS announces that he is rebuilding again, and is using his monitor for a receiver temporarily. W6AIN comes in with another total, and declares that three members of the Piedmont Radio Club of the Piedmont High School are trying to learn the Morse Code. WGEBM handled only two essages and is proud of it, which he should be, considering the QR M in his neighborhood. W6EY is still rapping out on the 7000-ke. band. W6EDR says he is going to 3500 soon and wants a sked with 8S.F. W6ALV announces he will be off the air for some months. Boating has taken the place of hamming but the boating isn't solo. W6BI announces that the Naval Reserve district has been allowed six CW 938 radio telephone sets and they will be operated on 1715 to 2000-ke band with code instruction and voice instruction to go with code work. They will also be used for ham work and he will give the entire sked soon. W6BSB is in New York, going as operator with Dr. Dumbrava on the Roumanian Arctic Expedition and will work near the 14-mec. band from East Greenland after August 15. W6CZR-W6GB will go to 14 me. in an effort to click with Bisbie and the expedition Jim Warner of KHAB, the Southern Cross, recently gave an intimate talk on the flight to the Oakland Radio Club somewhat on the lines of the recent article in Liberty M iga- tine. E. M. Sargent demonstrated his eleven tube shield grid superhet short wave receiver with its static eliminator at the last meeting of the East Bay Section. W6ASJ has been doing yeoman work with his observers on 7 and 14 me. and reports that off-wave operation seems to be clearing up. W6CTX announces he is selling out. He is one of the pioneer hams of the section. W6AQ is arranging a set of booths and stunts to get traffic for the section, and WUAN is about ready to open up on 3500. WO6AWF and W6DWI announce considerable success on 30 mc Traffic: W6EIB 396, W6ASH 225, W6ALX 165, W6AMW 1, W6EDO 56, W6EDK 48, W6BIW 24, W6CGM 238, W6BBM 26, W6RJ 26, W6BZU 14, W6BNG 11, W6AUT ll, W6BMS 11, W6AIN 10, W6ATR 9, W6EBM 6, W6EY 6, W6GATT 5, W6BYS 2, WG6EDR 2 SAN FRANCISCO —SCM, C. Bane, WOWB — The section will be pleased to know that for March we grabbed the traffic honors for the division, thereby winning the much desired banner for that month. The men reporting are to be thanked for their bit in making this possible in such a small Particular credit is due, of course, to our star traffic man W6AD and his second operator, who contributed greatly to our success. Our RM, W6ERK, has been moving mountains to stimulate interest in traffic besides being a regular and heavy contributor to the monthly totals W6PW rejoins our ranks this month with a bang, having done some nice traffic handling. W6DFR moved his A-A traffic up several notches and passes the hundred mark for the first time. W6DBD ran out on us and is now up in Alaska at a cannery station pounding brass. W6BIP has gone DX crazy and is heard nightly haunting the 14-me band. W6CIS reports, but informs us that he is leaving the section for about three months while he relieves some of the gang at the Department of Agriculture stations. WOEKC has proven himself and won his spurs as ORS. W6ETR reports and says that he is rebuilding to use more power W6DPF is evidently bac to stay, tonsecutive report. WG6EPT again joins the ranks after a long absence. Glad you re back, OB. W6ERS is beginning to section as this is his second OST 47 spurt right up in the traffic besides working plenty of DX. W6WI sends in his first report. FB. W6A MP is finally all set up again and is going strong on DX, but light on traffic W6PQ reports and is still nursing that fifty along on 300 volts. Hi. W6AMZ says he is struggling with the set but chiseled in some traffic. WOKJ reports working two nines on 28 me. using an 852 in self-excited circuit. W6BTO also works some stations on 28S mec. on week-ends, but is doing FB DX on 14 mc. W6WN says traffic is nilas no transmitter as yet. W6ATI continues to pound nails in the day and brass at night. WOWB copped off the honors for the section in the January Sweepstakes and also hooked his extra first ham ticket for 14-mc. ‘phone. W6FK sneaks off on the week-ends and haunts W6BAX's country in hopes of improving his DX. The 8.F.R.C., after much debate, has decided to iffiliate with the A.R.A. The organization resulting from such a move cannot help being the greatest S. F. has ever known and is conducive to better understanding and co- operation within our section. The name will be the Asso- ciated Radio Amateurs of San Francisco and we all look forward to bigger and better meetings. The meeting place will remain at California Hall, Polk and Turk Sts., San Francisco rraffic: WGOAD 1106, W6ERK 585, W6PW 112, W6DFR 102, W6BIP 80, W6CIS 45, WSEKC 43, W6DPF 25, W6ETR 19, W6EPT 17, W6ERS 17, W6KJ 6, W6WI 6, W6PQ 5, W6AMZ 4, W6AMP 3, W6BTO 2, W6ATI 1. SAN DIEGO SCM, H. A. Ambler, WO6EOP — All stations but two reported this month. W6ACJ as usual leads in traffic. W6BKX is now an ORS and is second in traffic W6EPF has got going again with xtal PDC. W6BGL is trying fone on 3.5 mc. W6EPZ won the Sweepstakes Contest in the San Diego Section. W6EUP is building a portable for summer vacation. W6ADC is another new ORS. W6CTP with a 171 works IPH and WFBX with R6 reports. WGBAM worked VK5HG on 28 mec. W6EOS is building a 100-watt xtal xmitter and will be on again soon. W6CN K has trouble keeping his battery up on his dynamotor. W6BAS is build- ing xtal ‘phone for 14,000 kc. W6BFE is going in for Navy amateur work. W6EOM is now W6ECP, as he lost his old call. WOCTR has a new QRA. W6DGW is building a new MOPA,. W6AEP of Oceanside is now an ORS. Several of the P.A.T. Club visited W6FP the other night and were served with some good eats. All had a fine time Traffic: W6ACJ 159, W6BKX 90, W6EPF 38, W6BGL 21, W6EPZ 16, W6EOP 15, W6ADC 11, W6CTP 9, W6BAM 8, W6EOS 4, WOCNK 1. ARIZONA SCM, H. R. Shortman, W6BWS — W6EFC reports a new ham in Phoenix signing W6DXC. W6EAA is going to wind a new plate transformer and get back on the air. WGC DU reports the National Guard station on the air. W6BWS says, *‘ Look for me with my new call, W6VV, and the new crystal set.'’ W6AWD reports two new hams in Mesa. W6DGN is getting out fine on 14 me. W6BJF has at last hooked a Jap. W6DCQ has a new fone set that blankets the whole 3500-kc. band. Hi. WGEOF has a new transmitter PHILIPPINES —SCM, 8S. M. Mathes, KAICY — Chis report received by radio via W6HM — KAIAC is now operating at KAIJR for the summer. KAILAF is closed for three months. KALAW is visiting Shanghai hams. KAICE sends in a nice report. KALCM is breaking in a bunch of new ops. KALCY is closing down for an extended trip to the States. KALDJ is our cracky, traffic station this month and has applied for an ORS appointment. KAIDL has a 250 bottle on the air. KALEL has gone to Baguio with a portable transmitter for the summer. KALHC skeds with W7MO and ACSHM. KAILHR has had hard luck and xmitter troubles, but turns in a good traffic report. KAIJR takes »ver the administrative duties as Asst. SCM. Get behind him, gang, and make the Philippines the biggest and best KAIMN is on with a 50 ina TPTG KALOM needs a key. KALPW reports a fine trip south. KAIRC is breaking in new ops. KAIXA works sked daily with KASAA who is isolated on a cattle ranch and cocoanut plantation on one of the southern islands. KA1ZA drowns out the band with 500 cycle AC. KA4HW is heard with 15 A. KA7AD got all set, sent CQ, burned Then he received a card section in the League watts working U.S out MG, got disgusted and quit from a ham in Calif. who had heard his CQ and is now hus-

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\ supply to get on again. KAT7TPA was KAIAU keeps a sked with KAIXA. fires burning in Zamboanga KAICE 109, KAICY 95, KAICM ‘AIHC 42, KAIHR 600, KA1JR 110, l rt sent in by radio from ACSHM hams were visited by AC3FR, ¢ and KAIPW of Manila during the ng, AC2MK, Tientsin, AC3ER, Shanghai are new hams. The follow- rir: AC2ZAL, AC2FF and ACITS. BPL. AC9OGH handles a nice bunch of 8, ACOGH 114, ACSAY 69, ACSTJ ROANOKE DIVISION INA SCM, Hal §. Justice, W4TS been very quiet in the Section and ris on the decrease. All active stations ) reports and bits of gossip to liven r leader in traffic for several months, n for a few months. Here's hoping soon, OM. WNRC sends the Official ke., both fone and ICW. Following is sent at 5, 10 and 20 words per soon have 250 watts c.c. on 3.5 me good skeds. W4AEW says traffic is on ng to arrange an entirely new set of UX852 in push-pull c.c., and is build- l superhet. W4JR is finding more time is plenty of traffic on 3.5 me. W4TS s apparatus. W4AA organized the ateur Club. W4ZB is rebuilding to use W4ZB 58, W4ABV 49, W4AA 37, 17, W4TS 16, W4RX 16, W4AHH 7 ng SCM, T. P. Mathewson, W3FJ — il control. W3CA is using an MOPA. r to finish college. W3ARU won the wuary Sweepstakes Contest. W3NO n for the A-A net. W3BDZ is going . Zepp antenna. W3KR now has a bug lent work with his many schedules ES with his 210. W3AMB at last has had coal wagon QRM. Hi. W3ABC S. W3ZU is a new ham in Richmond New York. Ham radio is very active e Short Wave Club. It now has fifty eeting, W4VB won a tube for being ASA won a 50-watter donated by W3CEL offered his 75-watt trans- ib room. W3WO 88, W3ARU 16, W3ABC 3, W3AMB4, W3FJ 20. \ SCM, D. B. Morris, WS8SJM — list of off-wave stations, and the fine hams are in that report. W8SHD keeps WSDNX and had as visitors WSIB and ts good DX and reliable traffic on ssed the amateur first while attending irlotte, N. C. WSTI keeps reliable W3ADO, W9FIG and WSDEN, also es last month. W8JM is trying to Sigma Tau frat house, at Fairmont ) keeps improving WMMN. WSBCN ich of all the new rules being passed. re’s that traffic? Skeds and traffic is } se check your wave, each time before 67, WSJM 55, WS8TI 31, WSDPO 28, WSBCN 11, WSAYI 6, W3U0 4. ’ MOUNTAIN DIVISION Acting SCM, L. D. Stearns, spite of coming sumnrer, activity is 7HX has been appointed Official Ob- n the frequency meter. W7AAF in ng station. W6DPJ leads in OST JUNE, 1930 traffic, and won a certificate in the January Sweepstakes Contest. The Utah Amateur Radio Club shows new stimulus with proposed station. W6BVB built the YL a set. Now she teaches in Idaho and they click every night on sked Traffic: W6DPJ 57, W6BTX 35, WOEKF 12, W6DP0 4, W7AAF 4 COLORADO SCM, C. R. Stedman, W9CAA — W9CVE leads in traffic. WOEJW did fine work. W9EAM is on 7000 and 3500 ke. W9CSR is experimenting on 28 me W9CAA has dismantled Traffic: WOCVE 70, W9EJW 51, W9EAM 21, W98CDE 3 W9CSR 1, SOUTHEASTERN DIVISION LABAMA SCM, Robert Troy, Jr... W4AHP A W4LM leads the State in traff FB, OB. W4AIR is not on much. The gang's prayers are asked that W4PAI will work Asia and Africa. Hi. W4TI is running his part of the State A-A system very well. W4AG is working DX. Good luck. W4AHP has been busy refinishing furniture for the O.W. Wearesorry tolose W4AHR asan ORS. He let his A.R.R.L. membership lapse. Hi. W4AEZ is having a hard time with his fone. He and W4AP keep a sked every day on 85 meters. W4CB has worked eight countries, includ- ing VK and ZL, using a 245. WI1IA is off till school is out He and W40OH are building a crystal-control fone. Very FB W4DS is joining the A-A net. Welcome, OM. W4AKB is busy answering calls for the Ala. Power Cx at the tele- phone switchboard. Hi. His other 50-watter broke, but he has another one. What has happened to you fellows in South Alabama? Not even a CQ out of you rraffic: W4LM 99, W4AAQ 75, W4AHR 47, W4PAI 17 W4TI 15, W4AHP 17, W4AJR 9, W4JX 29, W4AKB 1 W4CB 1 GEORGIA-SOUTH CAROLINA-CUBA-ISLE OF PINES SCM, M. 8. Alexander, W4RZ — W4AFQ and W4DV did some fine work at the Southeastern Open Golf Tournament in Augusta, Ga. They set up stations at the club house and at the ninth hole and as the players passed the ninth hole, the scores were sent via radiophone to the club house where they were turned over to the reporters and score keepers. The officials and newspaper men were very much pleased with the novel way of keeping in touch with the players on the course, and expressed a wish for such services at the National Open Golf Tournament. That cer- tainly is FB and shows the amateur spirit. W4SS just re- ceived a letter from headquarters informing him that he made the highest score in the fourth district in the Sweep- stakes Contest. W4TL, W4ACH and W4ABP are all new- comers in this district and, with the help of W4PD and W4CL, will soon be handling a lot of traffic. W4CL has just passed the exam for broadcast operator, and W4AFQ is now the holder of a commercial ticket. W4AAM reports that he is having trouble with his new station, but when his new parts arrive he will be on with a wallop. W4KI is using the xtal which he won ina contest at the Charlotte Convention. W4AJH works as substitute on sked with W1MK. Have just received application for ORS appointment from W4ABS down at Fort Bennings, Ga. W4KV and W4RZ have gone into amateur photography as a pastime and to help pass the days off while summer QRN is so bad. W4KV has moved his receiver into another room so he could get away from the hot sun and the remote control has worked out fine so far The Radio Club at Atlanta had a meeting last week and elected officers. We are starting out another year and hope to have a great time together as all the old hams are active members. CMSUF down in Cuba seems to have a lot of messages every month, and we surely would like to have some news about the activities in that part of the world Traffic: CMSUF 220, W4KV 89, W4KI 70, W4BO 60, W4JD 51, W4ABS 44, W4AFQ 29, W4JL 18, W4AJH 10. PORTO RICO-VIRGIN ISLANDS—SCM, E. W Mayer, KiKD — Congratulations are in order for a very FB bit of activity this month. K4DK originated a lot of traffic from naval vessels in port. K4AKV obtained a few the same way. KiKD went after traffic by mail and got 8 lot. K4DK and K4KD both hit the BPL with a bang. FB With the exception of 18 messages, K1KD handled all his traffic on his WIMK and W2FN schedules and claims & record, having sent as many as S82 messages to W2F'N on one

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1930 pstakes imulus ‘ow she DPO 4, AA — AM is =-S m DI HP V4ANR d that ng his king Pniture He let ving a every nelud- 18 out ry FB KB is e tele- but he South A117 KB 1 OF Q and 1 Golf at the yassed to the rs and > very 1 with * such it cer- st re- at he weep- new- ) and s Just S now iat he 3 new gz the ition. e Just :ABS gone as the od his n the > far - and hope ctive ot of have ld » OO, { 10 W very ot of . few rot a FB 1 his ns & 1 one Jung, 1930 Qso. K4AKV is helping out in off-frequency observation work on the 14-mc. band. K4KD received his ‘‘ Sweepstakes Certificate’’ for work in the January contest. K4ACF re- ports from the sick bed. K4KD now offers reliable QSP to Haiti and Cuba through stations operated by naval opera- tors in those countries. Traffic: KAKD 884, K4ADK 488, K4AAN 43, K4AKV 33, K4ACF 2. FLORIDA — SCM, Harvey Chafin, W4AII-W4PAW W4SK wins the state traffic banner this month with a total of 113. W4ACM, the Naval Reserve station is second W4ACM and W4AII kept a schedule with the Yacht Haligonian, KGAW, during the races from St. Petersburg, Fla., to Havana, Cuba. Messages were exchanged every day and delivered to the crews’ families, posting them on the race. W4MW is owner of the winning boat. W4MS was heard in Nicaragua. W4QA has been working asked with a radiophone station in Chicago. W4QV has a FB fone set on the air. W4ADP, up at Crescent City, is applying for an ORS appointment. WiMM is a new prospect for an ORS appointment. W4AGR has a permit to use fone on 14 m« W4AKA and W4JM are the only stations reporting from St. Petersburg. W4QL rebuilt his 852 transmitter and added a better power supply. W4AKH reports and also sends in a report for W4UJ. W4ALH, our newly appointed ORS and OBS, is getting out well. W4iMF is using a very low power set on 7000 ke. W4JC is a new prospect for ORS, W4QN, that whispering saxophonist, reports. W4NB has been re- building. W4TK has been busy at WJAX. W4ABF has two UX210's perking. We are very glad to have W4TG's report again. WiUJ managed to let nine messages slip into his station. A new amateur radio club was organized this month. —The Gator Amateur Radio Club, W4GD, President; W4AAB, Secretary; W4MS, Treasurer. W4AGN is doing FB U.S.N.R.F. work. A real U.S.N.R. meeting was held in Tampa on April 26th. The speaker was Commander Wells from Orlando, who gave a brief summary of the Naval Re- serve work. After his talk, a few questions were asked him and then the beans and coffee were served by Joyner, Martin and the SCM. W4AAB, the newest of the Gainesville sta- tions, hasa 210 going. W4W W is getting out pretty well with 2014's. W4ABL reports some DX lies. Hi. W4GD was QSO several foreigners. W4SD is rebuilding. W4IX and W4HX expect to have a station on the air very soon. W2BFH is moving to Tampa and is applying for an ORS appointment. W400 is sending his OBS about twice a day. W4A0 has been rebuilding. W4AAGY and W4HY report. W40Z is going on the air as a Naval Station and will keep the Thursday night skeds with the Naval net. The following are some of the amateurs at the P. A. Airways: WiBH, W4LO, W4NE, WiQV, W4ABG, W4ABA, W4AA0, W4S5SB, W4ACR, W4PAA, W4GJ, W4NZ, W4AEO, W4AY, W4AF, W4BA, W4PI, W4GF, W9FNF, W1IAMU, W6UA, WLYK, WSCTS, W5BNY, KFR6. Some of the PAA shop gang have been transferred to Brownsville on the Mexican division and are using the call WSBNY. The Miami Radio Club is picking up a bit despite the coming of summer. They gave a big blowout at W4AJD's house recently and about thirty were present. Traffic: W4SK 113, W4ACM 102, W4MS 82, W4AII 79, W4QA 70, W4QV 60, W4ADP 57, W4MM 59, W4AI 50, W4AGR 34, W4AKA 30, W4QL 30, W4AKH 24, W4MF 76, W4JO 30, W4QN 12, W4NB 12, W4AEA 12, W4JM 9, W4UP 9, W4TK 10, W4ABF 9, W4TG 9, W4UJ 9, W4AAB 6, WAWW 6, W400 8, W4A0 8, W4AGY 2, W40Z 1. WEST GULF DIVISION OUTHERN TEXAS—SCM, Robert E. Franklin, S W50X — This will find us with some new Federal Radio Commission rules that we have long been in need of although quite a number of us have been practicing these rules already. It is hoped that everybody will put their shoulder to the wheel and make it a real pleasure to work on the air again by adhering to the new rules to the letter W5AQY sends in a nice report as usual, but reports most of the bunch have spring fever. W5BKE is leaving Kerrville for Beaumont to attend the Radio School with a commercial ticket in view. W5BBY is to be congratulated on the way he has been. handling the Schriener Institute traffic considering the fact that he is going to graduate on May 2Sth as Saluta- OST 49 torian of the Senior Class. FB. W5BRKW has been getting out well. W5TD has been on a vacation in New Orleans. W5MS has been busy with the talkies this month. Quite a few of the hams have inquired about San Antonio's inactiv- ity. How about it, OMs? W5JR has just had his shack re- wired and promises to be back on the air real soon. W5BML is another new Houston ham. W5OX burned out his power transformer and will be off the air for a short time. W5AEA burned out a generator and is temporarily off the air pending repairs. W51U has a new portable call, WS5BOK. W5AE has ne of the new Aero short-wave tuners. W5AFG kicked ibout my not printing Beaumont reports, but as yet I have never received a message report from there. Send them in, OM, we are always glad to have them. Traffic: W5AQY 123, W5BKE 113, W5BBY 109, W50X 23, W5TD 19, W5BKW 19, W5AJD 96, W5EI 62. NORTHERN TEXAS — SCM, J. H. Robinson, W5BG Well, fellows, this will be the last report from this SCM. It has been a pleasure to serve this section. WSWW chal- lenges any ORS in Northern Texas in traffic handling. He reports DX good any time. W5RJ has a BCL op’s license now. W5BAM is working in the daytime now so his skeds will have to be rearranged. W5HY has his set on the air again after the last move. W5ZY reports for the first time. We are surely glad to hear from you, OB, and hope you continue to report. W5AAE has been on the 170-meter band all winter. W5BG still keeps skeds with KFR6. The follow- ng stations have reported for the first time, but report no traffic: W5BEN at Amarillo reports for the following: W5WX, W5APB, W5VD, WS5BEN, W5QE, W5ZH, W5BEI, SJ5BX, W5ALK. W5BEN has a 250 watt xtal set going now. W5BBH is going to apply for an ORS soon. W5D0 at Jacksboro reports that he is looking for traffic and wants to know how and when to report. W5BBF is getting skeds lined up and intends to make the BPL next month. W5DF reports a scarcity of traffic up his way. Traffic: WOWW 310, W5RJ 64, W5BAM 39, W5HY 16, W5BG 14, W5ZY 3. OKLAHOMA SCM, Wm. J. Gentry, W5GF — W5AUV has the high report of traffic this time. W5CB is second for the first time in ages. W5GF is busy with installa- tion of electric refrigerators. W5APG is going good in the Naval Reserve. W5ALM is going to get back on the air very soon. W5QL is using fone and gets FB reports. W5DH has an OW op in order now. Tulsa is getting ready for the big Brass Pounder's meeting. Traffic: W5AUV 54, W5CB 36, W5ALF 13, W5GF 7, W5AAV 2. NEW MEXICO—SCM, Leavenworth Wheeler, Jr., W5AHI W5AOD lays off for ten days and still makes the BPL easily on deliveries. That's three times straight. FB, says me. W5AJL accompanied the Clovis delegation to a musical convention in Las Vegas and, operating at W5ND, handled a lot of traffic to and from the delegates. While there, he and Dad and Bus of W5ND visited the SCM and put up a new pole. W5T'V finds 3500 ke. OK for low power except for QRN. W5EF claims 14 watts on 14 me. is better than 1 kw. on 7000 ke. W5AIE dropped in on the SCM again and says he's getting the traffic bug. W5BH is sorry now that he built a monitor — says ignorance was bliss. Hi. Most of the gang report very freaky conditions, strange skip effects, etc. Skeds have been all messed up by QSB at W5AHI and the bug is getting a rest. Possibly the solar eclipse due the latter part of April offers some explanation of the above Traffic: W5AOD 166, W5AHI 137, W5AJL 121, W5TV 40, W5E¥ 40, W5AIE 13, W5BH 9. CANADA MARITIME DIVISION OVA SCOTIA Acting SCM, A. M. Crowell, N VE1DQ — The boys seem to be concentrating on 4 the 14-mc. band now. VELAW and VEIGA have been testing on sked in the 3.5-mc. band. VE1BR has flocks of ‘‘W”’ stations calling him nightly on 14 me. VE1AS just put through a “shady” deal with VE1CC whereby a UX210 changed hands. VE1DQ made two very nice contacts with ZI, during the past month. Old timer VE1AR has reap- peared with the usual kick and p.d.c. on 14 me

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AND Acting SCM, E. V. Jerrett, going to Northeast Greenland again this wrying a short-wave transmitter. More VOSAE will soon be eligible for WAC. ropean countries consistently. VOSL has a nemitter. VOSMC is rebuilding for high W built himself a new TPTG transmitter work in the 7000-ke. band and wants local rts being heard in Austria on phone. 180 miles on dog team and delivered some k 39 messages from VOSWG at one sitting. for VE QSO’s Wednesday nights, boys. unce for every Canadian to get a real been suggested by the Publicity Man- R. of the R.S.G.B. that each and try to get a message of loyal greet- n H.R.H. the Prince of Wales. His 1 all know, is on the 23rd of June 23rd falls on Monday which would sage to be received in England on nday. Better still, as soon as you read ir birthday message to the Prince British station you QSO. embers will be on the watch for you i to QSP to destination. Let's put this We want greetings from every Prov- I n he hret th us again don't let dust collect. nd is at its best during the warm e your traffic on this frequency and f the good DX. Don't forget Canada Wednesday evening at 11:00 p.m. DIAN GENERAL MANAGER AL.ex Rew, VE2BE QUEBEC DIVISION SCM, Alphy L. Blais, VE2AC With ( 4 e record the passing of two amateurs, H. L 74 VE2BC, killed in a plane crash, and J VE2AU, who died March 24th. Both were 1 esteemed by the amateurs of this division 1 important traffic for the Byrd expedition nd WFBT. VE2BG has received his ORS us been trying different antennas. VE2BD ndles good traffic also. VE2BZ is working > me. to keep the messages rolling. VE2BJ s with A. J. Cipriani as President. VE2AP ly after he gets his B. Sc. VE2BN, formerly does well and promises real work when his ived. VE2AA is still going after DX on ts his ORS ticket for the fine work done Mrs. VE2CA is better, and pounding the E2HV is busy with the Company's many DN is using ‘phone on 3550 ke. VE2AC e Certificate for the All-Section Sweep- January, 1930, scoring 950 points. I am ve this section is. Many skeds are kept are confident that the All-Canada net will lay. Our Canadian General Manager was 2nd and 3rd, for the meeting of the f Directors. Don't forget the prizes for the r May to October. 101, VE2BE 54, VE2BG 22, VE2BB 14, BZ 8, VE2BJ 6, VE2CA 4, VE2BN 3, ONTARIO DIVISION ‘ SCM, E. (¢ Thompson, VE3FC ( trict: VE9AL again leads in traffic han- contacted 1750 stations and October, 1927. VESBP shows (00 ke. BP also reports two new VE3GK and VE3SHE. Welcome, ee? ( has ges since OST JUNE, 1930 OMs. VE3DA reports another new station about to show its teeth in Belleville. VE3DW is still using his “flea power’ transmitter. VE3GM, the outstanding amatey ‘phone station in Toronto, is showing the rest of the boys how it is done. VE3FC has been silent during the month Eastern District: VE3XC descended to 14 me. and worked a real list of DX. VE3XM is moving. Southern District VE3HB and VE3FD are now devoting their time to CW DX operating, and to helping new hams get started. These new stations have been allotted the calls VE3GZ and VE3WM. Welcome, fellows. VE3CB has been moderately active, but reports conditions all the way from punk to rotten. Northern District: VE3HU is heading straight for an ORS appointment, with bigger and better totals. VE3DM also handles traffic. Move over, gang, and make room for VE3DM‘'s brother-in-law, who has just been licensed as VE3SHD. VES3AR has gone to Red Lake to operate CF] and will use his brother's portable set, VE3BH, from there VE3BH will keep VE3AR on the air. VE3GD worked Spain on 14 me. VE3CA has moved the outfit to a new shack VESAG is on regularly. VESET shot the works and will be off for a while. The Fort Williams Radio Club, with VE3GD as President and VE3FQ as Vice-President, is going strong with well over 200 members rrafic: VE3HU 26, VESET 10, VE3DM 8, VE9AL 43, VES3BC 18, VE3BP 11, VE3DA %, VE3XC 2, VE3CB 4. VANALTA DIVISION LBERTA SCM, G. F. Barron, VEAEC What is A the matter, fellows? Your reports are as scarce as hens’ teeth. VE4EI is our star station. Our prospec- tive ham at Fort Saskatchewan expects his ticket soon VE4AAF is still experimenting with crystal. VE4HA handled an important message from Churchill in regard to some missing fliers. VE4DZ plans on busting the air with a port able. VE4G D made us a visit recently and VE4BV, VE4AF VE4DZ and VE4EC took him for a tour of the city. VE4EC has rebuilt twice in the last month. VE4FJ is pushing his sigs out FB. VE4HM, VEtGT and VE4CU are on occasion- ally. VE4EA had his 28 me. sigs reported in Ohio rraffic: VE4EI 53, VE4EC 3, VE4HA 1, VE4FJ 2, VE4EA 1. BRITISH COLUMBIA SCM, King Cavalsky VE5SAL In Vancouver VE5AC manages to spear the odd message. VE5BM has xtal on 7000 ke. VES5BC has his new mast up. VE5C1 is trying to get going again. VE5DR worked a K7 with a little old 201A. VES5FI blew his filter. Spring and golf have hit VE5AL. Victoria: The Victoria gang have been very active of late. VE5DU is getting xtal reports from the old slop jars. VE5CO puts R6 sigs to the ZLs. VE5HR hasn't worked any DX yet. VE5EC is on regularly. VE5C) gets on occasionally. VE5EK is having difficulty with his heap. VE5DQ and VESHK are rushing the YLs. Prince Rupert: VES5GT has skeds with VES5FS, VE5BM and W6EIB. VES5DX is a newcomer. VE5CM has moved VESAR is migrating to Kamloops. VE5BR at Savary Island still sticks to the 3500-ke. band. We are very sorry to hear that VE5A W has been under an operation, and hope he will soon be back on the air Traffic: VESAC 38, VESEC 6, VESCO 3 PRAIRIE DIVISION ANITOBA SCM, A. V. Chase, VE4HR— M VE4DJ is on very consistently. VE4IC heads the section in traffic. VE4GQ has returned to his old love, the Ultraudion. VE4DK has been QRL with U exams VE4BU has been granted an ORS appointment. VE4EK and VE4FN have had their certificates cancelled on account of inactivity. VE4BQ has obtained a Belgian 75-watt bottle for his station. Traffic: VEAIC 17, VE4HR 3. SASKATCHEWAN SCM, W. J. Pickering, VEAFC — The approaching summer is getting its dirty work in already as is shown by the few reports. VE41H comes through with his usual nice total. VE4BB and VE4GR say that the weather has been very bad. VE4CV of Swift Current # disturbing the ether with a 210. on 7 and 14 me. Traffic: VE41H 43, VE4BB 17 VE5BR 1, VE5AL 7, VES5DU 4%, VE4DJ 9, VE4BU 8, VE4GQ 5,

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BE, 1930 t to show his ‘flea amatey | the boys 1e month id worked . District 1e to CW ed. These 3GZ and oderately punk to ght for an VE3DM room for ensed as ‘ate CF] om there ced “pain »w shack 1d will be 1 VE3GD ng strong I9AL 43 3CB 4 What is scarce as prospec- cet soon. handled to some h a port VE4AF VE4EC shing his CCAS] 0D- E4FJ 2 avalsky the odd | his new t worked . Spring ing have rts from VE5HR VESC] with his Prince -M and moved y Island to hear e he will SDU 9 {HR — ads the his old exams V E4EK account t bottle 1GQ 5, iFC— \lready th with vat the Trent Jung, 1930 WIBUX-W1CMX, D. H. and J. Borden, Cherry St., Fall River, Mass. aclbd ce2ab ce3ab ce3ag ce3bf ceSaa ce7aa cm2jt cm2sh em5by em5cx cmSuf ctlaa ctlbx ctlby ctlew ct2aa cxlaf exlfb cxlfc cx ewk d4aar d4abg dixn earl0 earls ear21 sear37 ear59 eari5 ear98 earllt earl25 earl36 ei2d eidb fSaap fSaw fSaxq fSbtr fSbx fScher fScs fSda fSdh fSdmf fSdot fSef fSeo fSer fSesp fSex fSfem fsSfg fsfk fsfr fSgdb fSgi fSgon fShip fShr fSkz fSlx fSoa fSolu fSpam fSpmg fSpns fSprw fSrb fSrko fSsm fSswa fStoy fSwb fSwhg fSwkz fSwre fSyy ffSoxo fmScr fmSgke fmSjo fmsrit fo9sr freari49 g2ao g2az g2bm g2dt g2dz g2gf g2gm g2ip g2kf g2ma g2oa g2op g2ow g2un g5bd g5bj g5by g5bz g5is gdjo g5lw g5ml g5ms g5pj g5qa g5qv g5rs g5sk g5tz givm gowk g5yg g52n gébd g6cl gécr gidw géfd gigc gigs g6hp ghia g6lk g6ivf gént géou gépa géigqb girb givp géwo géiwt gowy g6xb géixn gtixq g6yq g6za gidhv gidnj hafSb hafkx helfg helle he2jc he2jm k4akv k4dk k4kd k6boe lulba lulbz luljf lu2aa lu2ca lu2dj lu3de lu3dh lu3fa lu3fk lu3he lu3pa lutbi lutdq luS5ac ludbz luddj luG6aj lu6fe lu7je luSdj lu8dy luSen lu9ce lu9dt nj2pa oa4j oa4l oa4q oatr oatz oh7nb ok2ny ontar ontbe ontfe on4fp on4ft ontgn onthe onthp on4jj ontjk ontka ontmy on4p) on4ro on4rs on4us ontwm oz7t oz7y paddw padflx padfp pataf patxg pk2aj pk3bm pylaa pylah pylaw pylbr pylcl pylem pyler pylfb pylia py2ad py2ay py2ba py2be py2bk py2bm py2ic py2ig py2ih py2ii py2ik py2qb py2sb py3aq py3la pySia sméua vedaw vk2dy vk2ek vk2he vk2hu vk2jz vk2nb vk2rx vk3ex vk3de vk3go vk3hk vk3lp vk3mo vk3pm vk3wo vk3xo vk4jh vk4rj vk5gt vkdit vk5hg vkSwr vk7dx voSme voSz vq2bh vu2dr vu2zx x2x x9a zllan zllfe zllfw zl2ac zl2gh zl3aj zslp zs2n zs2s zsta ssfe zsim zs4t zs5u 2tlj ztin ztlr ztlx ztdr zt5s zuld zu5b sun zutis zubw qqla fgz ctbj xearn xeft xc xoz7aw wfa wfat ontvm W3WG, Eugene B. DeTruck, aboard the SS. “Ange le — Between Bermuda and the Equator 7000-kc. band wlabn wlach wladj wlafe wlafw wlaje wlajk wlajx wlamd wlbdi wlbes wlbet wlbgi wlbil wlbjl wibnl wlbxl wleaa wledg wicjd wicpi wlept wldz wler wlfk wlgw wlid wlif wilk wimk winx wlog wirv wlsz wlwl w2abe i w2aiq w2ajp w2alu w2ane w2anx wade w2adl w2afw w2a w2apk ward w2aru w2ase w2aun w2avm w2avo w2aws w2axk w2ayj) w2azy w2bbq w2bds w2beq w2bfl w2bha w2bhr w2bkq w2bm w2bne w2boc w2bpg w2bpg w2brm w2bry w2bse w2bsw w2buq w2bve w2bvi w2bvk w2bwe w2bx w2bxj w2bxn w2bxw w2bzb w2caf w2cny w2cjt w2euq w2exl w2de w2dk w2fm w2fo w2ft w2hs w2jl w2kr w2ku w2le w2mq w2nl w2qf w2se w2uf w2wz w2xam w2xb w3aeq w3aff w3aho w3aic w3ajt w3amg w3a0g w3apf w3aru w3asg w3aup w3aus w3awm w3aws w3bkt w3bm w3bpi w3di w3ed w3hx w3hz w3la w3lu w3nk w3pe w3pq w3sb w3uh w4aci wtaef wiaft w4afw wiagr wiagw wdahq wiai wiaim wdaka wdtake wiakg wdakt wdakw wdalr wiarp wiax wicg wi4fx wigk w4gw w4hb wihd w4hk wthu w4jo wikp w4lj w4lx wimm w4nb wtoo w4pp w4sq wisx wduy wiwz wizn wizt woacl wivs wivz wdwt w5aao w5ady w5aea w5agn w5akp w5ana wdaqk w5arg wiatm w5aux w5aza wSbam wSbek w5bge¢ wS5bhy w5bq web w5cf w5eb w5fa wofb wifp wSiv w5jce w5jd wo5mm wino w5td wiww w6ami w6amw w6axe w6axm wibam wébbk w6bh w6bkk w6ébky w6bne w6éboq wb6bqf w6bqq w6bqz w6btd w6btw w6bvs w6byb wécbp wécis wéctk wictz w6ceze w6deg w6dep wédli w6dpj w6dpo wé6dui widwi widzy wtedg whiedo wheeb wh6ehi w6eiz wéejc whiejh w6ejk w6eke w6ena w6eou w6esp w6ew w6fc w6jn w6iqt wisf w6xbb wéxd w7aax w7afl w7ah wZ7aht w7aiz w7qf wSadu wSaed wSaes wSait wSajn wSald wS8amb wSanh wSaqx wSarl wSbax wSbecf wSbej wSbdv wSbed wSbex wSbid wSbih wSbjo wSbly wSbm wS8bno wSbnt wSbof wSbqp wSbrb wS8bti wSbv wS8can wScau wSccs wScew wScit wSciw wSexv wScyw wSdan wSdbs wSddg wSdev wSdgt wSdhu w&Sdii wSdilg w8dma wXdo wSdrt wSdwm wSft wSgz wSijs wSke wSkd wSll wSlt wSnr wSoj w8ss wSwa wSwk wSww wSyb w9acg w9acl w9ada w9aib w9aj w9ajo w9ajz w9akv w9akz w9amr wYams w9amv w9agh w9aqu w9aku w9auh w9aum w9axv w9azs w9azw wObba w9bes wObdh w9ben w9bhh w9bhi w9bhw w9bly w9bmr w9bmw w9bnf w9bns w9box w9bge w9btl w9bwk w9bwx wIcd wIcedh w9ceb w9cfa w9cfl w8cegh w9cjb w9ckz w9cnf w9cps w9cpy w9dbj w9dck w9ddo w9dfh w9dfs w9dft w9dga w9dgz w9dib w9dnh w9dol w9dti w9dwa w9dyb w8eaj w9ecz w9egu w9egzx w9eiz wel] w9ell w9exa w9ezt wits wftt w9ftz w9fyp w9gau wgdh w9ggb w9ggh w9g¢q wgix wOgijs w9jq w9kd w9nr w9lf cm2jm cm5fe em5fl em7sh cm8uf em8yb ctlex cx7 ear9l fS8dh f8fem fShel fSpam fsror g5by g5ml haf4e helfe helle k4kd k6ewb nn7ec ontbe on4dj onthm velam ve2ac ve2be ve2bp ve3be ve3cz ve3dd ve3ll veigi zllfe zlixe jk wladw wlae wlaep wlafa wlajd wlajl wlakd wlala wlasf wlaxv wlaze wlbak wlbln wicaw wiemx wlda wldp wljy wlkn wllq wlog wlom wlpf wlqv wiry wltl wlue wlvz wlwe wlza wlzz w2aeb w2aes w2aib w2alp w2alv w2amm w2amr w2arh w2ary w2aze w2bda w2bec w2ben w2biw w2bjg w2bsf w2byr w2cjx w2el w2fp w2gj w2hj w2hq w2jc w2o0v w2qn w2qp w2uk w2va w3aaz w3aiu w3aiz w3ajd w3aqi w3au0 w3awn w3dh w3jr w3me w3qw wtaay wdabr w4aef wiakt wiaq wiagi wice wifm wifz wimf w4ql w4tn w4we wéSaee w5agg woaom witd w6auz wibax w6kg wSaau wSadm wSaed wSarf wSaun wSaxa wSaxn wSbbl wSbem w&Sbjv wSbkp wSbrh wSbyvw wScp wSdjv wSdnu w&Sdui w8dwm wSdwv wSgs wShx wSpl wSss wSsu w9ark w9cxw w9def w9eaj wYecz w9ef well w9enr w9eve wSexw w9faz w9ftz w9giy cx7af ear96 fSaxq fSblg fSer fSfr fStsn fmSsmu g6vp géza haf3c kidk kfr6 lu2ca lu2dw lu3de lu3pa lu6aj lu8dy lu9dt nj2pa oa4j on4go oz5a pylaa pylaw pylel pylem py2ax py2ig py2ih py2ba py2bf qqla ve2bm ve2ca ve3cm ve3eo ve3qs ve3zz vkirb voSme x9a zllan zl2ac zlécm zl4ax ztér zu6b zy6n wSbfs wSbzt wSchq wScss wScut 7,000-ke. band Equator to Santos, Brazil. wlafd wlanp wlasf wlaxx wlmk wlmo wlqv wirp wlirv wlsz wlzb w2afr w2alu w2alz w2amr w2apd w2awg w2axn w2bjo w2bng w2bqf w2bwx w2cxl w2fm w2nl w2qf w2uf w2wr w3adp w3adz w3aig w3asg w3aws w3ba w3bg w3bkt w3pf wiahh wiahl wiahr wtaka wéalg wiaq wiec wit wigj wihb wipp w4pz wtvv wtwe w5ae w5ana w6aaz w6bjb w6caf w6car w6cii w6tm w6yx wSaam wSaat wSadp wSalu wSaxz wSayh wSbif wS8bls wXbno wS8boo wS8bps wSbqu wSbwi wSbwu wScjt wScss wScum wScux wSdkt wSjm wSrj wSvx wSwi w9amk w9ayd w9azy w9bes w9bkz w9bly w9bzq wcb] w9cja wIcjb w9cjn w9ems wIcevn w9dgz w9ebo w9ecz w9ehi w9eji weve w9ezb wIgdv w9ghw w9hd w9sm w9um w9ye cem&yb ear96 on4dj ve3cz (Continued on page 60)

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Correspondence The Publishers of QST assume no responsibility made herein by correspondents. for statements = All-American Mohawk Malay- sian Expedition Base Camp, Poeroek-Tjahoe Edit \ ir. Harry W. Wells (W3ZD, Chevy C} lio operator with the Expedition, has to time reported to the League thr the radio activities of the Expedi- wish to take this opportunity bef for the coast and PMZ is dis- n nk the American Radio Relay Le splendid coéperation we have re- cen ng up communication with the rough members at home and “i Holbrook, KAIAF, Ft. Mills, P. | nder S. M. Mathes, KAICY, Mar R. Potter, W6AKW, Lancaster, ( nel Clair Foster, W6HM, Car- me e operators, Mr. Wells informs n such generous support. ’ ikely heard by this time of the splet PMZ was able to render the gov- ern! Dutch East Indies at the time of the n here of the military post com- mai tain J. C. DeQuant, and the subse- que! nee. Mr. Wells, through Station KA \ICY was able to notify the garri- Sol rmasin of the tragedy, and has since heer | official reports regarding politi- ca s, ete., for the isolated post. Ther ng here now that through this inci- dent ible bv the A.R.R.L., the Dutch color rnment will elevate the status of an perators in these great islands an rm ust as our own government dor the League. If this comes about we hty proud, and I personally shall brit r to the attention of the Governor- Ger rst opportunity. _— The odore Ne ¢ lman n | inent Comment from Overseas 13 Seagry Road, London, E. 11 March QST hits the nail average \W » listen to the irdlyv realize that such an ex- modern irticles on station OST JUNE, 1930 equipment had been so ably written by Mr. Hull. It must be a great disappointment to the A.R.R.L. executives, as sponsors of Mr. Hull's work, to know that after twelve months’ working under the new conditions, the position is so little changed. Considering how easy it is to obtain a pure d.c. note, it really is surprising that a good 75% of the U. S. A. stations received on this side still sound like the proverbial band-saw. With regard to ‘‘off-wave’’ working, only one British amateur to my knowledge has been heard by the authorities working outside the “band,” and he found himself a B.C.L. again within twenty-four hours of the offense. This will show you the position in England. Wishing QST every success. Lawrence C. Fuller, G6LB The Far-Reaching Ham Spirit Houlton, Maine Editor, QST: Last June I had the misfortune of being the victim of an auto accident which left me with a broken back. Up until a few weeks ago I have been confined to the house, enclosed in a cast, which made it impossible for me to do anything which required the least effort on my part. It is during moments of trial and hardship that one appreciates the kindness and friendship of those about him. So through the medium of QST, I want to extend my sincere thanks and apprecia- tion to all of my fellow hams who have been so kind and generous to me during my illness. The fine spirit of fellowship extended by allt hose with whom I had the pleasure to work certainly helped very much in passing away what would have been many a long, lonesome hour. In all districts worked, especially the first and second, I found every ham a real sport, ever willing to do some little thing to make life more pleasant for me. The gang here at Houlton also stood by me in my trouble. The unseen amateur friend is cer- tainly one of sterling worth. 73 from a very grateful fellow ham. — Phillip Clark, W1BKN Constructive Work on ’Phone Olathe, Kans. Editor, QST: In response to a request published in QST7 for 1750-ke. stations to send code lessons, I volun-

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ine More than a score of different Cardwell Condensers were used in equipping the Byrd Antarctic Expedition Be Right The First Time! A ie may prove successful occasionally, but in the long run reliance on past performance proves the wisest course. The Byrd Antarctic Expedition, now successfully concluded, used 25 different types of Cardwell condensers. The success attained in maintaining Radio Communication with home and between isolated units of the Expedition is well known, and no comment on our part can add to the glory of these achievements. Cardwell condensers have always proved worthy of the con- fidence of winners and are worthy of your confidence. If you are in need of condensers you can play a sure thing and eliminate doubt— e Cardwells. Send direct if your dealer does not stock. Literature sent on request. CARDWELL #3 CONDENSERS Sadenser having the = DHE, ALLEN D. CARDWELL MFG. CORP. stator plate readily adjustable to permit changes in maximum 8 I Prospect Street, Brooklyn, N. » 2 capacity ranging frorn 50 to 10 mmfds, with a constant minimura of 7 mmids. Since broadcastin g began “THE STANDARD OF COMPARISON” Say You Saw It in QST — It Identifies You and Helps QST 53

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For RADIO Z TUBES Name Integrity is important in your tube selection rk of recognition, we have reproduced racteristics that identify genuine CUNNINGHAMS. ble proof of in-built quality CUNNINGHAM, INC. Chicago San Francisco Atlanta — 4 7 Saw It in QST | bet review, teered. During October and the first part of No. vember I, with the help of my sister, W9UA, sent 34 lessons, missing but one night, when lightning became so bad as to burn out the line telephone here. We conducted the lessons one- half hour in length, starting each one with alpha- then following with sentences sent slowly, and the last 10 minutes running the om- nigraph. About 10 minutes divided into sey- eral periods was taken up by explanation and answering of cards and letters. At the conclusion reports were asked with promise of sending a card when I came on the air again. About 50 re- ports were received. During November and December I built a new crystal controlled transmitter following many sug- gestions published in QS7’.. The set uses two Type ’52’s as power amplifiers, modulated by two 845’s. With this transmitter completed I came on the air Christmas and up until March Ist sent 50 lessons of an average of one hour in length. The new transmitter practically eliminated BCL in- terference so I ran it from 7:30 to 8:30 p.m. and sometimes later. The lessons were conducted on same lines as before, by starting each with the alphabet, following with slowly sent sentences taken from the Handbook, then running the om- nigraph from 7 words upward to about 15 words per minute. Reports soon began to come in from far and wide; 39 states, Canada and Mexico have been heard from. The set reached out consistently 1000 miles in every direction and 50 per cent of the time, 1500 miles. Many have claimed 15 words per minute speed gained, while dozens have applied for licenses or appeared before inspectors. Others have not yet received action on examinations or applications. Besides these there were a great many operating on provisional licenses, capable of doing only about 6 words, who listened and gained up to 12—15 and more. I write this to let you know that I have kept the schedules in spite of the fact that my sister, on whom I depended for help when I agreed toy send, has been sick since December. Anyone securing 25 or 30 of these leseondl gained speed enough to read calls and make they grade for examination as proven from reports. 7 have sent each Friday and Saturday since March? Ist just to give several of the last fellows getting? on a little boost. Now agree with me that ney 7- or 14-me. man has done more to help out the hundreds of fellows who want a little lift getting started, or tell me who he is and how he did it and I'll go his method one better next winter. Keep the good work up at Headquarters. — Marshall H. Ensor, W9BSP-W9UA Office Supervisor of Radio, 2116 L. S. Smith Bldg., Seattle, Wash. My dear Mr. Warner: Believing that you may be interested in some of | the amateurinquiries reaching this office, I am for- | warding the enclosed letter, ds ate d March 25, 1930. Edwin W. Lovejoy, U. S. Supervisor of Radio, Seventh Radio Distrid - It Identifies You and Helps QST

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f No 9UA, pnee — Capacity. Iphe SMFD sent > hak Voltage a 430DC uslon . 50 Can Negative a new y sug- Type $45’s. yn the nt 50 1. The >L in- 1. and ed on h the ences e om- words r and been tently ent of od 15 lozens vefore action these sional vords, re. kept sister, ed to -SsOngs Radio, Vash. me of m for- 1930. vadio, istrid

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=— it would be FATAL to lose Control Xx ”~ B ARBED wire — trenches — dug-outs - a field set and a thin strand of wire. The difference between control and lack of control may spell life or death to an entire brigade. It’s a far cry from No Man's Land to the comforts of your home But even in your radio set . control plays a vital part. . . andit has been the privilege of CErN- TRALAB to furnish the volume controls of millions of radio receivers. Is your radio — CENTRALAB equipped? Centralab Central Radio Laboratories D 20 F, Keefe Ave., and Humboldt MILWAUKEE, WIS. TRANSMITTING and RECEIVING PARTS and TUBES... | Biggest Discounts | fo Amateurs | ke of AC and DC parts, kits, , and cabinets of merit always 12 brands of tubes. I ical Information and Advice by I Seattle at Chicago and New York Prices | CDEL COMPANY SEATTLE, WASH. und ELECTRICAL JOBBERS W i¢) | Federal Radio Supervisor: Dear Sir: Am enclosing a diagram of spark transmitter, ~ = ~ ~ _ = = Me }ix | =Grovnd Is a license required to operate such a set and isit unlawful to operate such a set within the state? Would you please send me a complete set of rules governing radio communications? Thanking you in advance. A Suggestion Detroit, Mich. Editor, QST: I have just read with interest the letter by Charles Manley of Summit, N. J., with reference to rag-chewing. In this connection it occurs to me that it is about time QST7T did something to bring together those amateurs who are not primarily interested in traffic. I think this everlasting “QRU C U later,” coming as it usually does inm- mediately after two stations have made contact, is the main reason why so many amateurs have turned to radiophone for a change. Personally I am most interested in experi- | mental work and have been devoting a consid- erable portion of my spare time during the past twelve months to aircraft radiophone communi- cation experiments. This leaves me compara- tively little time for ham work, and while I am always glad to accept an important message for relay or delivery, I do not feel that I must accept the unimportant messages which take up most of | the time of our traffic stations. Granting that | traffic work is excellent training for any operator, it cannot be indulged in consistently except by operators who can keep regular schedules and be on the air for a reasonable time at least every other day. My amateur interest is about equally divided between telegraph and telephone but I think probably I get the most enjoyment out of a good | rag-chew or exchange of interesting information. | I also like to hook up with other amateurs who are willing to check transmission tests and who are competent to give an accurate report. During the past twelve months, however, I have not | 75°% of them have been working in the 14,000-ke. | | QSO’d more than fifty amateurs of this type and | Say You Saw It in QST — It Identifies You and Helps QST band. In the past it has been suggested that a special ne ex TI in hi a str fo

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Aerial id is it state? set of Mich. pr by rence to me bring arily isting $ im- itact, have cperi- nsid- past nuni- para- I am e for ecept st of that ator, it by id be very rided hink good tion. who who iring not and )-ke. ecial A NEw LINE OF TRANSFORMERS Again ACME leads in transmitting apparatus Here's a brand new line of transformers and chokes for transmitting stations. Back in 1920 when C. W. power began, Acme was the first to have the transformers ready for the tubes. Again Acme pioneers in trans- Mitting apparatus, this time with a line developed after years of experience and by studying the needs of the amateur and the transmitting station. Note the construction of this new line and some of the features exclusive to Acme. There's the porcelain insulators on the high tension termi- nals; theres the sttong metal case in which the trans- formers and chokes ACME ~for transmission Say You Saw It in QST are submerged in insulating compound. All these transformers and choke coils are insulated to (and tested at) 5000 R. M.S. (7000 peak) between all high voltage windings and ground. No more worry about the power supply failing just when you have an important message. Send for Bulletins 110 and 111 and learn all about this new line. You'll want to have this information on hand when you get ready to im- prove your station. Just fill in the cou- pon below and mail it to the Acme Ap- paratus Corporation, Cambridge, Mass. ACME APPARATUS CORP. Cambridge, Mass. Gentlemen: Please send me a copy of Bulletin 110-111. Dept. Q1 Name Address : and Helps QST

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Can you turn back e pages of time? have the 1920 series of OST — ibly you have not — you are he few. Even 1922 and 1923 re getting scarce. And copies be- war! Well, let’s change the irs from now QST copies of » doubt will be just as scarce. ider of QST appreciates its value. We are daily reminded fact by the many requests we get copies, many of which we ipply. or probably later this year ill be looking for a certain 1930 ST. You had better resolve to keep your copies in a ST Binder > the wire fasteners Unnecessary to mutilate Opens and lies flat lany position One-fifty each postpaid will keep your QSTs always | protect them for future use. od-looking binder, too. OST 11 Park St., Hartford, Conn. Say You Saw It in QST - It Identifies You and Helps QST general call be assigned to experimenters or rag. chewers and I strongly second this suggestion, — C, H. Vincent, WSRD-W8XB. Hi! 735 Purdy St., Birmingham, Mich, Editor, QST: You might tell me, if you can, whether the lag vestiges of our famous and virulent fever eve leave the veins of an erstwhile victim. For lo, | had thought the persistent bug completely gone but his devious ways surpass the understanding of man, selah! Yesterday I came across QST ip the library, and turned its familiar but strangely different pages. Therein I came across Redding. ton’s picture of a station of by-gone days. My eyes felt slightly misty and my throat a littk tight. A few years ago I was one of the regulars and although always more of an experimenter than operator, the love of the hobby is about the same, as you know, in both. Putting myself through college and working at the same time has taken all of my energy for the past four years. But it's all over now, and I’m a full-fledged liar —| mean lawyer. The other night, however, I must needs tear the broadeast receiver to pieces, and put it to gether again. There’s something infectious about the feel of a soldering iron, and the smell of bur- ing resin. Oh well! Send me that Handbook. I’ve gotta see where things stand. — John C. The Off-Frequency Problem Dryden, N. Y. L. Cowen, Ex-SBYR. Editor, QST: For the past few years QST has been stressing the perils of off-band operation of amateur trans mitters. This has been especially true during the last year, since off-frequency operation has be come an international crime. This has been s good thing and been heeded by those who pos sess anywhere near the normal intelligence. However, recent developments seem to indi cate that there are a few in this amateur radio game who do not seem to be able to comprehend the magnitude of the offense of off-frequency op eration. These few should realize that someone # going to get hurt — hurt bad. The worst of it 8 that the innocent will have to suffer with the guilty if this situation continues. These people who continue to operate out of their proper chan- nels should realize that they are almost sure to be causing interference with very costly services. Those who operate transatlantic stations are losing money when their operation is interrupted. I am told that it costs about five thousand dol lars an hour for each hour these stations ar caused to stand by. Now this brings us to the question: what wil be done about it, who will do it, and what can the amateurs in general do about it? In the first place the government will have to take drasti¢ a] Gr Pl

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S OF Tag. e€zestion, —WS8XB. nm, Mich, r the las ‘ver ever For lo, | ely gone, standing 3 OST in strangely Redding. ays. My S & little ilars and ter than he same, through as taken But it’s liar —| eds tear ut it to us about of burn- ve gotta p-SBYR. lem n, N.Y. stressing ir trans ring the has be been 8 rho pos be. to indi ur radio prehend oncy Op neone is | of its vith the } people er chan- re to be services. ons are rupted. ind dol- ons are hat will can the he first drastic RADIOTRON UV— 3849 MODULATOR, AMPLIFIER or OSCILLATOR MATEURS who operate phone transmitters of medium power will find that Radiotron UV-849 is a very effective modulator. Its characteristics have been so designed as to make it particularly suited for use with oscillators operating at plate voltages of from 2000 to 3000 volts. The high quality of phone transmission obtainable through its use will gratify the most exacting amateur. Then too, Radiotron UV-849 will give remarkably smooth and stable performance when used either as an oscillator or as a radio frequency amplifier at frequencies below 3000 kilocycles (wave-lengths above 100 meters). Filament Volts 11 Filament Amperes 5 Amplification Factor 19 Modulator Oscillator and RF Power Amplifier Plate Volts . . . ~~ + « 2000 3000 Max. Max. Operating Plate Voltage Grid Bias Volts .... . 87 -132 Modulated DC Plate Volts . . . 2000 Plate Current (ma.) . ... . 60 100 Non-modulated DC Plate Volts. . 2500 Plate Resistance (ohms) . . 4000 3200 Max. DC Plate Current (ma.) . . . . 350 Plate Dissipation (watts) . . 300 Max. Max. Plate Dissipation (watts). . . . 400 Oscillator Input Watts for each Power Output (watts). . . . « « « 350 UV-849 (Mod. Factor 0.7). 110 350 ENGINEERING PRODUCTS DIVISION RCA VICTOR COMPANY, INC. 233 Broadway, New York, N. Y. Representatives in Principal Cities — It Identifies You and Helps QST Say You Saw It in QS7

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= Can you turn back the pages of time? ive the 1920 series of OST — ibly you have not — you are he few. Even 1922 and 1923 getting scarce. And copies be- war! Well, let’s change the irs from now QST copies of loubt will be just as scarce. der of QST appreciates its ilue. We are daily reminded by the many requests we get ypies, many of which we ply. or probably later this year ill be looking for a certain 1930 ST. You had better resolve » keep your copies in a OST Binder the wire fasteners iry to mutilate Opens and lies flat ny position One-fifty each postpaid will keep your QSTs always protect them for future use. od-looking binder, too. OST | Park St., Hartford, Conn. Say You Saw It in QST - It Identifies You and Helps QST general call be assigned to experimenters or rag. chewers and I strongly second this suggestion, — C, H. Vincent, W8RD-W8XB. Hi! 735 Purdy St., Birmingham, Mich, § « Editor, QST: You might tell me, if you can, whether the last vestiges of our famous and virulent fever ever leave the veins of an erstwhile victim. For lo, | had thought the persistent bug completely gone but his devious ways surpass the understanding of man, selah! Yesterday I came across (ST ip the library, and turned its familiar but strangely different pages. Therein | came across Redding. ton’s picture of a station of by-gone days. My eyes felt slightly misty and my throat a little tight. A few years ago I was one of the regulars and although always more of an experimenter than operator, the love of the hobby is about the same, as you know, in both. Putting myself through college and working at the same time has taken all of my energy for the past four years. But it’s all over now, and I’m a full-fledged liar —! mean lawyer. The other night, however, I must needs tear the broadcast receiver to pieces, and put it to gether again. There’s something infectious about the feel of a soldering iron, and the smell of burn- ing resin. Oh well! Send me that Handbook. I’ve gotta see where things stand. — John C. L. Cowen, Ex-SBYR. The Off-Frequency Problem Dryden, N. Y. Editor, QST: For the past few years QST has been stressing the perils of off-band operation of amateur trans- mitters. This has been especially true during the last year, since off-frequency operation has be- come an international crime. This has been a good thing and been heeded by those who poe sess anywhere near the normal intelligence. However, recent developments seem to indi- cate that there are a few in this amateur radio PI game who do not seem to be able to comprehend § ¢ the magnitude of the offense of off-frequency op § py eration. These few should realize that someone i PI going to get hurt — hurt bad. The worst of it is Py that the innocent will have to suffer with the 0 guilty if this situation continues. These people who continue to operate out of their proper chan- nels should realize that they are almost sure to be causing interference with very costly services. Those who operate transatlantic stations are losing money when their operation is interrupted. I am told that it costs about five thousand dol- lars an hour for each hour these stations are caused to stand by. Now this brings us to the question: what will be done about it, who will do it, and what can the amateurs in general do about it? In the first place the government will have to take drastic

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3 OF rag. S—— sestion. -W8XB. 1, Mich, the last ver ever ‘or lo, | ly gone, standing QST in [rangely edding. uys. My a little lars and er than 1e€ Same, through is taken But it's ° a i-| MODULATOR, AMPLIFIER or OSCILLATOR ‘ds tear . te MATEURS who operate phone transmitters of medium of burn power will find that Radiotron UV-849 is a very effective ‘ modulator. Its characteristics have been so designed as to e gotta , ' , make it particularly suited for use with oscillators operating “SBYR. at plate voltages of from 2000 to 3000 volts. The high quality om, of phone transmission obtainable through its use will gratify ny the most exacting amateur. Then too, Radiotron UV-849 will give remarkably smooth Hressing . “. aaa and stable performance when used either as an oscillator or ing the as a radio frequency amplifier at frequencies below 3000 has be kilocycles (wave-lengths above 100 meters). been a - 5 ho pos Filament Volts 11 Filament Amperes 5 Amplification Factor 19 Se o indi- Modulator Oscillator and RF Power Amplifier r radio Plate Volts ‘se ea 2000 3000 Max. Max. Operating Plate Voltage wohene Grid Bias Volts ..... 87 -132 Modulated DC Plate Volts 2000 acy Op Plate Current (ma.) . . . . . 60 100 Non-modulated DC Plate Volts . 2500 tah Plate Resistance (ohms) 4000 3200 Max. DC Plate Current (ma.) . . . . 350 * ‘a Plate Dissipation (watts) 300 Max. Max. Plate Dissipation (watts) . - 400 sa - Oscillator Input Watts for each Power Output (watts) . . . « « « « 3530 people UV-849 (Mod. Factor 0.7). 110 350 r chan- e to be ae ENGINEERING PRODUCTS DIVISION upted. jol- T¥ T a RCA VICTOR COMPANY, INC. s 233 Broadway, New York, N. Y. at will an the Representatives in Principal Cities e first jrastic Say You Saw It in QST — It Identifies You and Helps QST

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FOR PURE D.C. POWER SUPPLY P. R. 866 Fil. Volts - 2.5 Fil. Amps. - 5 Peak Inverse Volts - 5,000 Peak Plate - 0.6 234” Price - - $8.00 the new regulations all T NDER [ imateurs must use ade- mn ly filtered D. C. current R. 866 and P. R. 872, both n iry vapor rectifiers, besides el ing a wave form easy to filter, h a stable source of plate volt- full load or no load, because ubes possess a low and prac- constant voltage drop. The ially long life of the P. R. 866 P. R. 872 is due to the low oper- temperature of the oxide | filament combined with the mely low voltage drop result- ing from their mereury content. these Perryman rectifiers, is for their rugged strength, in bringing your station in line he new regulations. ittractive prices for licensed amateurs PT LECTRIC CO., Iwc., 4 i.. North Bergen, N. J. nd Money order go, $ check at $18.00. Mate Say You Saw It in QST — It Identifies You and Helps QST action, for this sort of thing cannot be allowed to go on. Amateurs must realize right now that something has got to be done—and done quickly. It must be realized that the surest way for the government to correct the problem is to prohibit amateur radio entirely. This puts the problem in the hands of the amateur to correct his own problems, and at once, if he is to continue to exist. The air will have to be policed, and by the ama- teurs themselves. I would like to suggest that a number of amateurs, who possess the necessary frequency meters to determine the limits of the bands, be appointed by the A.R.R.L. to act as police of the amateurs, in much the same manner as the Official Broadcasting Stations are ap- pointed.* These stations could notify the offend- ing stations and also the Radio Inspectors. I am sure that if this were done, and the amateurs knew that they were being watched and re. ported, there would be very little off-frequency operation. Let me say that in all fairness to the conscien- tious amateur, something has got to be done about these outlaws. Amateurs should remember that it is the duty, according to law, of each and every one to report any of these violators that they chance to hear. If they do not they them- selves are equally guilty with the offender. This business is a serious thing — let us get under way right now and somehow, someway do away with this off-frequency business. — John T. McWatters, WSCBK. * The A.R.R.L. Official Observers, two or more in each Section, do just this work, their reports being coérdinated at Headquarters so that necessary action may be taken against persistent and flagrant offenders who jeopardize amateur privileges. — Eprror Calls Heard (Continued from page 14,000-ke. band wlasf wlava wlbbe wlbil wlbl wilcek wleow wlda w2adp w2ajj w2amm w2bbe w2byr w2cxl w2dta w2ff w2ja w2ov w2rs w3aiz w3dh w4we wSced wSlo wns wbef wOdef wO9dhp w9dgz w9eap w9wt ce3ci ct7aa cx7ac fSex fS8fem fSswa g2egm goby g5ml g5wt giwt lulbz lu2dj lu2fi lu3fa lu7je luSdj luSdy oa4q on4bt on4hj on4jj pylah pyied pyler py2ad py2ak py2ay py2az py2ll py2ik py3ak py3aq pySia ve2bd zstm exewk 1) w2a0w w2bia W6EQO-W6BBY, F. C. Thompson, 155 N. Canyon Blvd., Monovia, Calif. 1759-ke. ‘phone w9byq w5kq w9bfx wibky w9xv w9dky w9bfy W2AJP, Norman B. Krim, 227 Haven Ave., New York City, N. Y. emlby em2xa cmSle emSuf emh2 emz51 ctibd ctlep ctlkg d4aez ear52 earll3 fSdz helfg helle k4kd k5dd k6eb okina on4uy vk2hk vk4hu vk2ns vk3bq vk3ga_ vk3jk vk4bh vk4do vk5it vk7ch zllbn Elliott C. Hagar, 30 Adams Ave., West Newton, Mass. 14,000-ke. band celah ce3ag em5fl em8ux w6ekw w7je cm8yb ctlaa ctlbr ctlby ctlew ecxlaf cx7 d4rh ear21 ear96 ear98 ei2d eisb fSaw fSdmf fSer fSgyn fShr fSkz fSleb f&gyn fShr fSks | fSleb fSsm fmS8er fm8gke g2fs g2ip g20q g5by g5bz goml IF

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wed to v that done st way n is to its the correct ntinue e ama- that a ‘essary of the act as hnanner re ap- ffend- I am ateurs nd re- juency scien- » done ember *h and 's that them- -. This Pr way y with CBR, in each rated at against \mateur w2adp w2dta lo wns a ex7ae yz lu2dj j pylah : py3ak ive., p ctikg d k6eb vk3jk 1 ctlbr 2d eiSb ur f8ks z goml Mode! 301 Voltmeter with 2500 or 3000 Volt Scales. Model 301 Milliammeter 100, 200 or 500 M.A. Scales. Model 301 Rectifier Meter for measuring A.C. in plate supply — 500 Micro- ampere A.C. Scale. Weston Electrical Instrument Corporation Be prepared to meet the NEW REGULATIONS Ox: of the new regulations which the Federal Radio Commission has recently adopted with reference to the amateur is that he must keep an accurate station log showing, among other things, the input power to the last amplifier stage in the case of a multi-tube transmitter, or the watts input to a self-excited oscillator. The new regulations also state that the amateur must use “‘an adequately filtered direct current power supply or its equivalent.” These regulations now in effect require that the amateur should be able to properly adjust his equipment to conform with them. But before the amateur can do so he must be provided with meters of suitable characteristics and proper ranges for accurately indicating the voltages being applied to his tubes and the current he is drawing from them. For this service Weston offers three new instru- ments of the famous Model 301 design equipped with Bakelite cases — shown in the illustrations. For complete descriptions and instructions in the use of these meters write to the factory direct, addressing your inquiry to the Radio Engineering Department. PIONEERS SINCE 1888 roN hn. INSTRUMENTS 602 Frelinghuysen Ave., Newark, N. J. Say You Saw It in QS7 It Identifies You and Helps QS7

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g6vp g6wo g6yt haf8b helfg he2je he2jm hafSb kéky k6ewb laig laih lu3fa lu3pa lu5ac lu9dt nj2pa nninic oa oa4l oat4q oa4r on4fp ond4ft on4gn onthp on4jk ondmy on4vu o2z7y pa0qf pylaa pylaw py2ik py2az py2bg vedao ve5aw voSae vo8aw voSme xig xwim zllao zl2bx gl4ay zs4e zu6n ex-W3AVJ, J. G. Houck, 319 Walnut St., Pottstown, Pa. 14,000-ke. band g2gm g5by g5ml g6rb g6ut fSex fSfg fShe fmSrit on4jj onthp on4ro earl0 ear37 ear96 ear98 d2ce dirh ctlbx ctl by cedag lu2dj lu3de pylem py2bf helfg k7mn cmS8uf velam veir veibp vetbx veick veigk vetgl vetcu vetic wlacl wébsy wicln wicxw w6dcev wheak w6egh w6ejc w6ff wince why wafr w7alb w7ff w7fh w7fl w7li w7sg w7vy paUzi ——— .NCTICAL PRACTICAL Rapio RADIO. x, RaDio 7 — These three books cover the entire field of building, repair- ing and ‘‘trouble-shooting’’ on 14,000-ke. "phone band modern broadcast receiving sets. The wiagr w9anz w9qy ibrary has been brought right up-to-the- 7000-ke. band ute im every respect, including the very | levelopments in the design and manu- : f equipment. The recent interest in sh reception is reflected in a section which d ) the construction of this type of receiver. 3500-ke. ‘phone band w3ev w3jz w3aex w2gj w2iu wSazk wSaju (HE RADIO CONSTRUCTION WSAFK, Mr. J. Lawrence Evans, Jr., Danid LIBRARY School Observatory, Franklin and Marshall College, Lancaster, Pa. emz53 k4kd k5do x29a hafkx whiac w6bhy wé6bi wébn w6by w6car w6cjn wicxe widni w6doz w6dyn wé6eks whet} w6ks w7ahw w7nv wivy Th mes, 6 x 9, 993 pages, 561 illustrations wlaar wlaky wlegr w2aca w2amb w2apf w2bec wba ‘T , ks embody not only a thorough home- w2boz w2bp w2ckj w2fr w2ga w2iu w2ji w2ju w2qn w3ain 1 ready means of reference for the w3as w3avw w3cegb wicz w3jf wthn wSahz wSaos wSbr ytrician. Step-by-step information is wSbwx wSewu w9bg welx wOnm trouble-shooting," installation and best tone quality, distance and selec- W2CBB, H. J. Conti, 15 Harbor Terrace Drive. eption from all types of sets. Rye, N.Y. equipment, such as loudspeakers, an- 7000-ke. band battery eliminators, chargers, vacuum xt is profusely illustrated throughout. w6ahp whakd whakf w6ass wiawp w6bam wébas woble whibgef w6bqq wiby wicgx wh6cii whcrz wicto wicxw whe w6decu w6dhe widpj widyj w6dzu w6ebg w6ec wteke wheva ' EY DOWN — SEE THESE BOOKS FREE - b a a. : ° a wiky w6sf w6yx w7acf w7ahw w7nr k4taan k4acf kikd mply clip and mail this coupon diaez cm2jm em2ro cm2xe em5fl cmSuf nj2pa nm9a nmxda nninic nn7nic velda ve2bb vesbt ve3gt ve3xk vetcu vedap —- a | ib wa McGRAW-HILL FREE EXAMINATION COUPON} | “°°” ets oy WSLA, Ralph E. Jackson, Box 226, $ — aan Neo Yock _ Frankfort, Mich. the Radio Construction Library, three ays’ free examination. I agree to remit an f $1.50 at the end of 10 days and $2.00 a rice of $7.50 is paid or- will return the ten days. | 7000-ke. band ti2rs kidd kidk ktkd k6ewb k6alm emSyb cm&le cmSde | helfg zlift zllfe zl2dg zl2ac zl2bg¢ vk2jh vk2hm vk2l vk3hu vk3pr vk3wx vk3jk vk3pm vk4bh vkSit vk5hg vkijo | vk5wr vk7ch pxr gi5ml | 14,000-ke. band aqla py law W1ZB, Carl J. Madsen, Chicopee Falls, Mas. 7000-ke. band wind w6axm w6bqk w6cbp wécnn w6cug wédiz wédpi whidyn w6eva wicxw w6equ wZ7acf w7fb w7lz w7vy waa emSyb fllaw nj2pa Ville yom = sees 14,000-ke. band w6aqj w6cyi w6dev w7be w7na w7ty em5cx cmSuf ctl helfg helle ktakv lu2aa lu3dh lutda lud5ak oa4j ontw vethg vetic voSme Chargers + Eliminators W2BKZ, Charles T. Kolz, aboard S.S. “ Toltee,” Radios United Fruit Co. Steamship Service Off Florida coast PARTS AND SERVICE Seite. een TROT TR w9azy w3arp wSnp w9ph wShv w9cph w3amz w3bnu woatt ELECTROLYTE wSrt w5za w2dp wSbgx w9kd w3anh wScuq wiebo wit wSuf w4ik wlbjl ve3cz At anchor, Puerta Cortez, Jan. 31, 1930 4. F. M ARTHENS COMPANY wo5ave w2bai w3aws wei wags w igd whit w5ajl wS¥) Factory Representatives wlahl w2cvj wSaav w5aea w4rz w5aqy wSddg w4qe wSat Cortlandt 4489 54 Dey Street, New York wftt wSlt w9ahe w9bhh w2ard woawm w2gg w5ae wan w5bdd w9fqs w9kb wSafm w2aof w4afw w6cqk w2bse wilt WRITE FOR INSTRUCTIONS Say You Saw It in QST — It Identifies You and Helps QST

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“We found over a period of two years that CeCo Tubes were if8 ; nl ni 4 ° th entey the most profitable to handle in more than one way.” a redao ALBERT A. LIST, List Brothers Distributors, Fall River, Mass. 2bx zltao | Pacreasing use of high- == quality phone transmitters by amateurs created de- mand for rugged, long-lived, Daniel a powerful modulator tubes

»-. capable of withstanding e Drive, heavy overloads and high se voltages. The new CeCo 250 Tube with its rugged fila- nd ment, high emission, small grid current and super YoU KNOW! - * The CeCo million dollar wafers Vacuum is well adapted for vy W/98 BBant in the world devoted lusively to the manufac- re of radio tubes te : this service. 4j onduu CeCo has pioneered in uch tube achievements as T oltec,” B-409, B-406, “G,” FRANKLIN S. HUDDY, Assistant to Chief Engineer, H,”“K,” Hi-Mu, the A.C. . ° een Gand 236 tebe and CeCo Manufacturing Co., Inc., Providence, R. I. me A.C. Pentode < e 3 an oe = ] 930 America, and = Ce Co oe Fuses S7 It Id

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@ 7 Do You want to be a \ High Class Radio Operator? j You can be a Clear, Fast a J . Sender, able to work with — the best of them. You can ~ be a Rapid, Accurate Re- ~~ ceiver, able to copy the fast writer. The Successful Methods used hest paid Radiomen are taught to The Candler System of High- agape Telegraphing intensive training for developing vending Speed quickly through Scientific k theories). It trains the Brain, Muscles Co- ordinate in doing fast, accurate work. t power of Concentration; gives you aking you sure of yourself at all times. r speed now is, we guarantee to increase and on ships at sea are successful ave taken and are taking the Candler my speed (55 wpm) to your System."’— World's Champion. ““Can copy fast stuff nd easily. Radio-Typing Course is best for mond H. Bell, U.S.S. Idaho. Thousands of pour into our offices from all over the ubstitute for the Candler System of raphing. “slow class” and do something, about this great Course and n F 45,000 operators. Give your nd te 1 us what you want to accomplish. Radio-Typing Course. The CANDLER SYSTEM CO. Dept. RL. ith Kedzie Avenue Chicago, Illinois POWER SUPPLY Amateur Stations are now compelled to emit a nure tone signal. This can nly be obtained by use of an efficient Power Supply. REL CAN ASSIST YOU WITH YOUR POWER SUPPLY PROBLEMS WRITE FOR LITERATURE CRO RADIO ENGINEERING LABS. INC. 100 WILBUR AVENUE LONG ISLAND CITY, N. Y. Say You Saw It in QST — It Identifies You and Helps QST w9apd w6abd w6cgx wodce wSke wSbkp w2caz w2pe wip w3bsj wSduw w9bkz w3ake w9dwr wSbhq w@fey wah w5akp wthd w5bex wicm cmlby nnlnic ximq cmiy) zzlbb x5z W1MS, Charles H. Horton, 173 No. Adams §, Manchester, N. H. 14,000-ke. band ce5aa emScx cm8uf ctlaa ctl bx f&es f8da fSex f8fr fSfk g2» e2kf g5by g5bz giml g5mz helle he2jm he2jo k4kd lum nj2pa oalke oatr on4ft onign onthe on4jj pylea py2y aqla ve2be ve3rf vetbu vetbx vetfk vetfr ve5ao vk3y vk3dy vk3pa zxda W9ASV, Charles E. Perry, Motor Route 3, Ba 821, Joplin, Mo. celai ce2ab ce2ac de2ak ce2bm ce3bf ctlbx ct3ab [Sam fSer f8ep f8fe f8fd fShl f8hr g5by g5ye g6hp g6xb kit k4ni k6etf nofuu pylaa pylaw py2ak xpaoja xpaozz x x9a xbx zllal zllfb zl2aw wfat rwx wsq W. A. Bousfield, York St., Bellerive, Tasmanis wlajt wlajy wlamj wlanz wlerw wirw wiry w2abu wah w2ait w2arb w2bda w2bjg¢ w2ct w2dab w2jw w2af wir w2tp w3aiz w3aur w3ja w3qv wiabw w4ft w5afb widyi w5ql wory w6asl w6awz w6bax wican w6dnx w6dzm whey w6fk w6qy w6vz w7qr wSaz wSavp wSdsi wS8xk wad w9beu wOdgz wef wIeta wOfbv w9fxj ac2ff ac3ma aulkd bam celah celav ctlaa d4abg dian d4by d4uak d4uj d4yt ear21 fSalp fS8da fSdmf fSdo fSdot f8fr f8g¢db fSgua fSho fix f8jf fSolu fSrrr f8sm f8wb wS8zx g2bm g2od g2sw g2xv git: goby g25uq gowp eg5yx g6dh efhp gint g6vp g6wy etirb giv hafS8b j3ch klhr ki pw kise kixa k4aan kfr5 oh2nad ok2ny on4bz on4fe on4fp on4hp on4il on4ja on4jj on4us onty on4ww oz7t oz7y pb7w pk3bm smé6ua ti2Zhv un7ww uo velar ve3aq vetdj x9a x9b rwx wfa Experimenters’ Section (Continued from page 33) would be of great interest to many amateur Another thing — if you have an idea which yor think ought to work, but which you haven't th time or facilities to try out, send it in anyhow- someone else may be in a position to try it, andi may turn out to be good. If you have a problen which you can’t solve you will very often fini that someone else has found a solution, so if you let us know about it we can often make mentia of it and bring forth a lot of responses. In othe words, look at the ‘“‘X”’ Section as being a clearing house for ideas and helpful kinks, and remembe that if you are interested in knowing what t other fellow is doing, he is probably just as mu interested in hearing what you have done als The only thing which can ever destroy the w fulness of this section will be lack of mater and we have no doubt that the average ham enough ingenious stunts to keep us going for yea? and years. Just how good we make it is up to of us who are doing things and overcoming di culties every day in the course of our radio li More Progress on 28 Megacycles (Continued from page 32) in the T & R Bulletin. We will present a fe items of interest. G20D copied W9EF solid on February 2

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w2pe wi fp fey wah mq cmiy) dams St. fr §Sfk g2y k4kd lu3ddé flea py2b 2520 vk it t3ab f8aap g6xb kin xpaozz x T'asmania Zabu wah: w2af wir vafb wdyk dzm whey 8xk wad ma aulkad < d4uj dyt 1a fSho fSir y g2xv gi v goérb gout 2nad ok2ny n4us ondy n7ww uo amateurs vhich you iven't th nyhow- rit, andi a problem often fini _ so if you e mentiol In othe a clearin remembel what tl t as mud done als y the us material » ham ha z for yea 3 up to af ming diff radio life -ycles ent a fe ruary 20

June, 1930 work on the 14-mc. band. K4KD received his ‘‘ Sweepstakes Certificate’’ for work in the January contest. K4ACF re- ports from the sick bed. K4+KD now offers reliable QSP to Haiti and Cuba through stations operated by naval opera- tors in those countries Traffic: KAKD 881, K4DK 488, K4AAN 43, K4AKV 33, K4ACF 2. FLORIDA SCM, Harvey Chafin, W4AII-W4PAW — W4SK wins the state traffic banner this month with a total f 113. W4ACM, the Naval Reserve station is second. WiACM and W4AII kept a schedule with the Yacht Haligonian, KGAW, during the races from St. Petersburg, Fla., to Havana, Cuba. Messages were exchanged every day and delivered to the crews’ families, posting them on the race. W4MW is owner of the winning boat. W4iMS was heard in Nicaragua. W4QA has been working a sked with a radiophone station in Chicago. WiQV has a FB fone set on the air. W4ADP, up at Crescent City, is applying for an RS appointment. W4MM is a new prospect for an ORS sppointment. W4AGR has a permit to use fone on 14 me W4AKA and W4JM are the only stations reporting from St. Petersburg. W4QL rebuilt his 852 transmitter and added a better power supply. W4AKH reports and also sends in a report for W4UJ. W4ALH, our newly appointed ORS and )BS, is getting out well. W4MF is using a very low power st on 7000 ke. W4JC is a new prospect for ORS, W4QN, that whispering saxophonist, reports. W4NB has been re- building. W4TK has been busy at WJAX. W4ABF has two (X210's perking. We are very glad to have W4TG's report gain. WiUJ managed to let nine messages slip into his sation. A new amateur radio club was organized this month -The Gator Amateur Radio Club, W4GD, President; W4AAB, Secretary; W4MS, Treasurer. W4AGN is doing PB U.S.N.R.F. work. A real U.S.N.R. meeting was held in Tampa on April 26th. The speaker was Commander Wells tom Orlando, who gave a brief summary of the Naval Re- erve work. After his talk, a few questions were asked him and then the beans and coffee were served by Joyner, Martin und the SCM. W4AAB, the newest of the Gainesville sta- tions, has a 210 going. W4W W is getting out pretty well with H1A's. W4ABL reports some DX lies. Hi. W4GD was QSO several foreigners. W4SD is rebuilding. W4IX and W4HX expect to have a station on the air very soon. W2BFH is moving to Tampa and is applying for an ORS appointment W400 is sending his OBS about twice a day. W4AO has been rebuilding. WAAGY and W4HY report. W40Z is going m the air as a Naval Station and will keep the Thursday night skeds with the Naval net. The following are some of the amateurs at the P. A. Airways: WiBH, W4LO, W4NE, WIQV, W4ABG, W4ABA, W4AA0, W48SB, W4CR, W4PAA, W4GJ, W4NZ, W4AE0, W4AY, W4AF, W4BA, W4P1, W4GF, WOF NF, WLAMU, W6UA, WLYK, WSCTS, W5BNY, KFR6. Some of the PAA shop gang have been transferred to Brownsville on the Mexican division and are wing the call W5BNY. The Miami Radio Club is picking up a bit despite the coming of summer. They gave a big blowout at W1AJD's house recently and about thirty were present. Traffic: W4SK 113, W4ACM 102, W4MS 82, W4AII 79, WiQA 70, WAQV 60, W4ADP 57, W4MM 59, W4AI 50, W4AGR 34, W4AKA 30, W4QL 30, W4AKH 24, WAMF 1%, W4JO 30, W4QN 12, W4NB 12, W4AEA 12, W4JM 9, WAUP 9, W4TK 10, W4ABF 9, W4TG 9, W4UJ 9, W4AAB 6, WAWW 6, W400 8, W4A0 8, W4AGY 2, W40Z 1. WEST GULF DIVISION OUTHERN TEXAS—SCM, Robert E. Franklin, s W50X — This will find us with some new Federal Radio Commission rules that we have long been in need of although quite a number of us have been practicing these rules already. It is hoped that everybody will put their thoulder to the wheel and make it a real pleasure to work on the air again by adhering to the new rules to the letter W5AQY sends in a nice report as usual, but reports most of the bunch have spring fever. W5BKE is leaving Kerrville for Beaumont to attend the Radio School with a commercial ticket in view. W5BBY is to be congratulated on the way he has been handling the Schriener Institute traffic considering the fact that he is going to graduate on May 28th as Saluta- OST gsO. K4AKV is helping out in off-frequency observation

49 torian of the Senior Class. FB. W5BKW has been getting out well. W5TD has been on a vacation in New Orleans. W5MS has been busy with the talkies this month. Quite a few of the hams have inquired about San Antonio's inactiv- ity. How about it, OMs? W5JR has just had his shack re- wired and promises to be back on the air real soon. WOSBML is another new Houston ham. W5OX burned out his power transformer and will be off the air for a short time. W5AEA burned out a generator and is temporarily off the air pending repairs. W5IU has a new portable call, WSBOK. W5AE has one of the new Aero short-wave tuners. W5AFG kicked about my not printing Beaumont reports, but as yet I have never received a message report from there. Send them in, OM, we are always glad to have them. rraffic: W5AQY 123, W5BKE 113, W5BBY 109, W50X 23, W5TD 19, W5BKW 19, W5AJD 96, W5EI 62. NORTHERN TEXAS — SCM, J. H. Robinson, W5BG - Well, fellows, this will be the last report from this SCM. It has been a pleasure to serve this section. WOSWW chal- lenges any ORS in Northern Texas in traffic handling. He “* reports DX good any time. W5RJ has a BCL op’s license now. W5BAM is working in the daytime now so his skeds will have to be rearranged. W5HY has his set on the air again after the last move. W5ZY reports for the first time. We are surely glad to hear from you, OB, and hope you continue to report. W5AAE has been on the 170-meter band all winter. W5BG still keeps skeds with KFR6. The follow- ing stations have reported for the first’ time, but report no traffic: W5BEN at Amarillo reports for the following: W5WX, W5APB, W5VD, W5BEN, W5QE, W5ZH, W5BEI, SJ5BX, W5ALK. W5BEN has a 250 watt xtal set going now. W5BBH is going to apply for an ORS soon. W5D0 at Jacksboro reports that he is looking for traffic and wants to know how and when to report. W5BBF is getting skeds lined up and intends to make the BPL next month. W5DF reports a scarcity of traffic up his way. rraffic: WSWW 310, W5RJ 64, W5BAM 39, W5HY 16, W5BG 14, W5ZY 3. OKLAHOMA —SCM, Wm. J. Gentry, W5GF— W5AUV has the high report of traffic this time. W5CB is second for the first time in ages. W5GF is busy with installa- tion of electric refrigerators. W5APG is going good in the Naval Reserve. W5ALM is going to get back on the air very soon. W5QL is using fone and gets FB reports. W5DH has an OW op in order now. Tulsa is getting ready for the big Brass Pounder's meeting. Traffic: W5AUV 54, W5CB 36, W5ALF 13, W5GF 7, W5AAV 2. NEW MEXICO—SCM, Leavenworth Wheeler, Jr., W5AHI W5AOD lays off for ten days and still makes the BPL easily on deliveries. That's three times straight. FB, says me. W5AJL accompanied the Clovis delegation to a musical convention in Las Vegas and, operating at W5ND, handled a lot of traffic to and from the delegates. While there, he and Dad and Bus of W5ND visited the SCM and put up a new pole. W5T'YV finds 3500 ke. OK for low power except for QRN. W5EF claims 14 watts on 14 me. is better than 1 kw. on 7000 ke. W5AIE dropped in on the SCM again and says he’s getting the traffic bug. W5BH is sorry now that he built a monitor — says ignorance was bliss. Hi. Most of the gang report very freaky conditions, strange skip effects, etc. Skeds have been all messed up by QSB at W5AHI and the bug is getting a rest. Possibly the solar eclipse due the latter part of April offers some explanation of the above. Traffic: W5AOD 166, W5AHI 137, 40, W5EF 40, W5Al1E 13, W5BH 9. W5AJL 121, W5TV CANADA MARITIME DIVISION OVA SCOTIA — Acting SCM, A. M. Crowell, N VE1DQ — The boys seem to be concentrating on the 14-me. band now. VEIAW and VEIGA have been testing on sked in the 3.5-mc. band. VE1BR has flocks of ‘‘W”’ stations calling him nightly on 14 me. VE1AS just put through a “shady” deal with VELCC whereby a UX210 changed hands. VE1DQ made two very nice contacts with ZL during the past monta. Old timer VE1AR has reap- peared with the usual kick and p.d.c. on 14 me.

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O

ALND Acting SCM, E. going to Northeast Greenland again this wrrying a short-wave transmitter. More VOSAE will soon be eligible for WAC. pean countries consistently er. VOSMC is rebuilding for high +t TK himself a new TPTG n the 7000-ke. band and V. Jerrett, VOSL has a transmitter wants local rts being heard in Austria on phone. 80 miles on dog team and delivered some 39 messages from VOSWG at one sitting r VE QSO’s Wednesday nights, boys

ce for every Canadian to get a real 1 suggested by the Publicity Man- & n try to get a message of loyal greet- R of the K.S.G.B. that e H.R.H. the Prince of W: > 1 all know, is on the 23rd « ird falls on Monday which would essage to be received in England on lay. Better still, as soon as you read ir birthday message to the Prince first British station you QSO. bers will be on the watch for you ito QSP to destination. Let's put this We want greetings from every Prov- € nd ve f the good DX. Don't forget Wednesday evening at 11:( 18 again don't let dust is at its best during the warm ir traffic on this frequency and ach and ales. His f June collect. Canada 0 p.m.

ADIAN GENERAL MANAGER A.ex Rem, VE2BE QUEBEC DIVISION SCM, Alphy L. Blais, VE2AC — With < m< witl rd the passing of two amateurs, H. L. VE2BC, killed in a plane crash, and J. VE2AU, who died March 24th esteemed by the amateurs of this division | important traffic for the Byrd expedition nd WFBT. VE2BG has received his ORS has been trying different antennas. VE2BD handles good traffic also. VE2BZ is working to keep the messages rolling. VE2BJ A. J. Cipriani as President. VE2AP rly after he gets his B. Sc. VE2BN, formerly does well and promises real work when bis i. VE2AA is still going after DX on gets his ORS ticket for the fine work done Mrs. VE2CA is better, and pounding the VE2HV is busy with the Company's many L2DN is using ‘phone on 3550 ke. VE2AC Certificate for the All-Section Sweep- f January, 1930, scoring 950 points. | am active this section is. Many skeds are kept we are confident that the All-Canada net will ne day. Our Canadian General Manager was ay 2nd and 3rd, for the meeting of the f Directors. Don't forget the prizes for the for May to October. vec E2BZ 8, VE2BJ 6, VE2CA 4, ONTARIO DIVISION SCM, E. C. Thompson, Distri ‘BC ct VESAL again leads in has contacted 1750 st Both were AC 101, VE2BE 54, VE2BG 22, VE2BB 14, VE2BN 3, VE3FC — traffic han- ations and essages since October, 1927. VE3BP shows 3600 ke. BP also reports two new ‘ on air 1D VE3GK and VE3HE.

Welcome,

OST JUNE, 1930 OMs. VES3DA reports another new station about to show its teeth in Belleville. VE3DW is still using his “flea. power ’ transmitter. VE3GM, the outstanding amatey ‘phone station in Toronto, is showing the rest of the boys how it is done. VESFC has been silent during the month Eastern District: VE3XC descended to 14 me. and worked a real list of DX. VE3XM is moving. Southern District VE3HB and VE3FD are now devoting their time to CW DX operating, and to helping new hams get started. These new stations have been allotted the calls VE3GZ and VE3WM. Welcome, fellows. VESCB has been moderately active, but reports conditions all the way from punk ti rotten. Northern District: VESHU is heading straight for an ORS appointment, with bigger and better totals. \E3DM also handles traffic. Move over, gang, and make room for VE3DM's brother-in-law, who has just been licensed as VE3SHD. VESAR has gone to Red Lake to operate CF) and will use his brother's portable set, VE3BH, from there VE3BH will keep VE3AR on the air. VE3GD worked Spain on 14 me. VE3CA has moved the outfit to a new shack VESAG is on regularly. VE3ET shot the works and will be off for a while. The Fort Williams Radio Club, with VE3GD as President and VESFQ as Vice-President, is going strong with well over 200 members Traffic: VE3SHU 26, VE3ET 10, VE3DM 8, VESAL 43 VE3BC 18, VE3BP 11, VE3DA 9, VE3XC 2, VE3CB 4 VANALTA DIVISION LBERTA — SCM, G. F. Barron, VE4EC — What is A the matter, fellows? Your reports are as scarce as hens’ teeth. VE4EI is our star station. Our prospec- tive ham at Fort Saskatchewan expects his ticket soon VE4AF is still experimenting with crystal. VE4HA handled an important message from Churchill in regard to some missing fliers. VE4DZ plans on busting the air with a port- able. \E4GD made us a visit recently and VE4BV, VE4AF VE4DZ and VE4EC took him for a tour of the city. V ELEC has rebuilt twice in the last month. VE4FJ is pushing his sigs out FB. VE4HM, VE4GT and VE4CU are on occasion- ally. \E4EA had his 28 me. sigs reported in Ohio Traffic: VE4EI 53, VE4EC 3, VE4HA 1, VE4FJ 2 VE4EA 1 BRITISH COLUMBIA SCM, King Cavalsky VESAL — In Vancouver VE5AC manages to spear the odd message. VE5BM has xtal on 7000 ke. VESBC has his new mast up. VESCL is trying to get going again. VE5DR worked a K7 with a little old 201A. VE5FI blew his filter. Spring and golf have hit VES5AL. Victoria: The Victoria gang have been very active of late. VE5DU is getting xtal reports from the old slop jars. VESCO puts R6 sigs to the ZLs. VE5HR hasn't worked any DX yet. VESEC is on regularly. VES5C) gets on occasionally. VE5EK is having difficulty with bis heap. VE5DQ and VE5HK are rushing the YLs. Prince Rupert: VESGT has skeds with VESFS, VE5BM and W6EIB. VE5DX is a newcomer. VE5CM has moved VESAR is migrating to Kamloops. VE5BR at Savary Island still sticks to the 3500-ke. band. We are very sorry to hear that VE5AW has been under an operation, and hope he will soon be back on the air Trafic: VES5AC 8, VESBR 1, VE5AL 7, VES5DU 4, VESEC 6, VESCO 3. PRAIRIE DIVISION ANITOBA SCM, A. V. Chase, VE4HR-— M VE4DJ is on very consistently. VE4IC heads the section in traffic. VE4GQ has returned to his old love, the Ultraudion. VE4DK has been QRL with U exams VE4BU has been granted an ORS appointment. VE4EK and VE4F N have had their certificates cancelled on account of inactivity. VE4BQ has obtained a Belgian 75-watt bottle for his station. Traffic: VE4IC 17, VE4DJ 9, VE4BU 8, VE4GQ 5, VE4HR 3. SASKATCHEWAN — SCM, W. J. Pickering, VE4FC — The approaching summer is getting its dirty work in already as is shown by the few reports. VE41H comes through with his usual nice total. VE4BB and VE4GR say that the weather has been very bad. VE4CV of Swift Current # disturbing the ether with a 210. on 7 and 14 mc. Traffic: VE4I1H 43, VE4BB 17.

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amateur the boys ie month d worked District ie to CW ed. These 3GZ and oderately punk ¢ ght foran VE3DM room for nd will be h VE3GD ng strong ESAL 4 3CI $4 - What is scarce as r prospec- ket soon \ handled to some th a port- VE4Al \V E4EC ishing his occasion- VEAFJ 2 Cavalsky ir the odd is his new Rh worked -. Spring rang have orts from VES5HR y. VESC] Y with his s. Prince BM and s moved iry Island 'y to hear pe he will E5DU 4, E4HR—- heads the to his old U exams VE4EK n account att bottle E41GQ 5 ’/EAFC— n already ugh with that the Surrent June, 1930 W1BUX-W1CMX, D. H. and J. Borden, Cherry St., Fall River, Mass. aclbd ce2ab ce3ab ce3ag ce3bf cedaa ce7aa cm2jt cm2sh emSby em5cx cmS8uf ctlaa ctlbx ctlby ctlew ct2aa cxlaf exlfb exlfe cx ewk d4aar d4abg d4xn earl0 earl8 ear21 ear37 ear59 ear65 ear98 earll6 earl25 earl36 ei2d eiSb fSaap fSaw fSaxq fSbtr fSbx f&cher fScs fSda fSdh fSdmf fSdot fSef fSeo fSer fSesp fSex fSfem fSfg fSfk fSfr fSedb fSgi fSgon fShip fShr fSkz fSlx fSoa fSolu fSpam fSpmg f8pns fSprw fSrb fS8rko fSsm fSswa fStoy fSwb fSwhg fSwkz fSwrg fSyy ffSoxo fmS8cr fmSgke fmSjo fmSrit fo9sr freari49 g2ao g2az g2bm g2dt g2dz g2gf g2gm g2ip g2kf g2ma g2o0a g2op g2ow g2un g5bd g5bj g5by g5bz gdis g5jo g5lw g5ml gims g5pj g5qa g5qv g5rs g5sk g5tz gi5vm gowk g5yg g5z2n g6bd gtcl gicr gédw géfd gége gigs g6hp gia gélk géivf gint géou g6pa giqb géirb givp g6wo géwt gowy g6éxb géixn géxq giyq g6za gidhv gidn) hafSb hafkx belfg helle he2je he2jm k4akv k4dk k4kd k6boe lulba lulbz luljf lu2aa lu2ca lu2dj lu3de lu3dh lu3fa lu3fk lu3he lu3pa lu4bi lu4dq luS5ac luSbz lu5dj luGaj lu6fe lu7je luSdj lu8dy luSen lu9ce lu9dt nj2pa oa4j oa4l oa4q oatr oatz oh7nb ok2ny on4ar ontbe on4fe on4fp on4ft onign onthe onthp on4jj ontjk on4ka on4tmy on4pj on4ro on4rs on4us onfvm on4wm oz7t oz7y patdw pad@flx padtfp pataf patxg pk2aj pk3bm pylaa pylah pylaw pylbr pylcl pylem pyler pylfb pylia py2ad py2ay py2ba py2bg py2bk py2bm py2ic py2ig py2ih py2ii py2ik py2qb py2sb py3aq py3la pySia sm6ua vedaw vk2dy vk2ek vk2he vk2hu vk2jz vk2nb vk2rx vk3ex vk3de vk3go vk3hk vk3lp vk3mo vk3pm vk3wo vk3xo vk4jh vk4rj vkigt vk5it vk5hg vkSwr vk7dx voSme voSz vq2bh vu2dr vu2zx x2x x9a zllan azllfe zllfw 2l2ac zl2gh zl3aj zslp zs2n zs2g zsia mie zsim zs4t zs5u 2tlj ztln 2tlr ztlx 2t5r zt5s zuld zu5b zu6n zu6és zu6w qqla fgz ctbj xearn xeft xc xoz7aw wia wfat W3WG, Eugene B. DeTruck, aboard the SS. “ Angeles” Between Bermuda and the Equator 7000-ke. band wlabr wlach wladj wlafe wlafw wlaje wlajk wlajx wlamd wlbdi wlbes wlbet wlbgi wlbil wlbjl wlbnl wlbxl wleaa wledg wicjd wlepi wlept wldz wler wlfk wlgw wlid wlif wllk wimk winx wlog wirv wisz wlwl w2abe wade w2adl w2afw w2aii w2aiq w2ajp w2alu w2ane w2anx w2apk ward w2aru w2ase w2aun w2avm w2avo w2aws w2axk way) w2azy w2bbq w2bds w2beq w2bfl w2bha w2bhr w2bkq w2bm w2bne w2boc w2bpg w2bpg w2brm w2bry w2bse w2bsw w2buq w2bve w2bvi w2bvk w2bwe w2bx w2bxj) w2bxn w2bxw w2bzb w2caf w2eny w2cjt 9 > w2euq w2exl w2de w2dk w2fm w2fo w2ft w2hs w2jl w2kr w2ku w2le 4 w2mq w2nl w2qf w2se w2uf w2wz w2xam w2xb w3aeq w3aff w3aho w3aic w3ajt w3amg w3a0g w3apf waaru w3asg w3aup w3aus w3awm w3aws w3bkt w3bm w3bpi w3di w3ed w3hx w3hz w3la w3lu w3nk w3pe w3pq wisb w3uh wtaci wiaef wtaft w4afw wtagr wtagw wiahq wiai wiaim wdaka wdtake w4akg wdakt wdtakw wdalr wiarp w4ax wicg wifx wigk wigw w4thb w4ihd w4hk wthu w4jo w4kp w4lj w4lx wimm w4nb woo w4pp w4sq wisx wiuy wivs wivz wéwt wiwz w4zn w4zt w5aao woach w5ady w5aea w5agn w5akp wana w5aqk w5arg wiatm w5aux w5aza w5bam w5bek w5bg wS5bhy w5bq wieb w5cf w5eb w5fa w5fb wifp wiv w5je w5jd w5imm wino w5td wiww w6ami wiamw w6axe wi6axm wéibam wibbk w6bh w6bkk wé6bky w6bne wéboq wtbqf w6bqq w6bqz w6btd w6btw w6bvs wébyb w6cbp wé6cis w6ctk wictz wh6cze wédeg wéidep wédli w6dpj w6dpo w6dui widwi wi6dzy wtiedg w6edo wheeb whehi wheiz wéh6ejc w6ejh w6ejk w6eke w6ena w6eou w6esp w6ew w6fc w6jn w6qt wisf w6xbb wixd w7aax w7afl w7ah w7aht w7aiz w7qf wSadu wSaed wSaes wSait wSajn wSald wS8amb wSanh wSaqx wSarl wSbax wSbef wSbcj wSbdv wSbed wSbfs wSbgt wSbgx wSbid wSbih wSbjo wSbly wS8bm wSbno wS8bnt wSbof wS8bqp wSbrb wSbti wSbv w8can wScau wSecs w&ccw wS8cft wScfw wSchq w&css wS8cut wSexv wScyw wSdan wSdbs wSddg w&Sdev wSdgt wSdhu wSdii wSdig w8dma w&do wSdrt wS8dwm wSft w&gz wSjs wSke wSkd wSll wSlit wSnr wSoj w&8ss wSwa wSwk wS8ww wSyb w9acg w9acl w9ada w9aib w9aj w9ajo w9ajz w9akv w9akz w9amr w¥ams w9amv w9agh w9aqu w9aku w9auh w9aum w9axv w9azs w9azw w9bba w9bes w9bdh w9ben w9bhh w9bhi w9bhw w9bly w9bmr w9bmw w9bnf w9bns w9box w9bqe w9btl w9bwk w9bwx w9cd wScedh w9ceb wcfa w9cfl w9egh w9cjb w9ckz w9cnf w9cps w9cpy w9dbj w9dck w9ddo w9dfh w9dfs w9dft w9dga w9dgz w9dib w9dnh w9dol w9dti wOdwa w9dyb wS9eaj w9ecz w9egu wSegx w9eiz wel] well w9exa w9ezt wits w9ftt wIftz wSfyp w9gau w9gdh w9ggb w9ggh w9ggq w9gix w9gis w9jq wkd w9nr w9lf cm2jm em5fe cm5fl em7sh cm8uf em8yb ctlex cx7 ear9l fS8dh f8fem fS8hel fSpam fS8ror g5by z5ml haf4e helfe helle kikd k6ewb nn7e ondbe on4dj onthm velam ve2ac ve2be ve2bp vedbe ve3cz veddd ve3ll veigi zllfe zl4xc jk wladw wlae wlaep wlafa wlajd wlajl wlakd wlala wlasf wlaxv wlaze wlbak wibin wleaw wlemx wlda widp wljy wlkn wllq wlog wlom wlipf wlqv wiry wltl wluc wlvz wlwe wlza wlzz w2aeb w2aes w2aib w2alp w2aly w2amm w2amr w2arh w2ary w2aze w2bda w2bec w2ben w2biw w2bjg w2bsf w2byr w2ecjx w2el w2fp w2gj w2hj w2hq w2jc w2ov w2qn w2qp w2uk w2va w3aaz w3aiu w3aiz w3ajd w3aqi w3au0 w3awn w3dh w3jr w3me w3qw wiaay wdabr wiaef wiakt wtaq wiaqi wice wifm wifz wimf w4ql witn w4we wéaee w5agg w5aom w5td w6auz w6bax wékg wSaau wSadm wSaed wSarf wSaun wSaxa wSaxn wSbbl wS8bem wSbjv wSbkp wSbrh wSbyvw wScp wSdjv wSdnu wS8dui w8dwm wSdwv wSgs wShx w&pl wS8ss wS8su w9ark w9cxw wSdef w9eaj w9ecz wef well w9enr w9eve w9exw w9faz wIftz w9giy cx7af ear96 fSaxq fSblg fSer fSfr fStsn fmS8smu g6vp g6za haf3e kidk kfr6 lu2ca lu2dw lu3de lu3pa lu6aj luSdy lu9dt nj2pa oa4j on4go oz5a pylaa pylaw pylcl pylem py2ax py2ig py2ih py2ba py2bf qqla ve2bm ve2ca ve3em veseo ve3qs ve3zz vk4irb voSme x9a zllan zl2ac zl3cm zil4ax zttr zu6b zy6n 7,000-ke. band Equator to Santos, Brazil. wlafd wlanp wlasf wlaxx wlmk wlmo wlqv wirp wlirv wlsz wlzb w2afr w2alu w2alz w2amr w2apd w2awq w2axn w2bjo w2bng w2bqf w2bwx w2cxl w2fm w2nl w2qf w2uf w2wr w3adp w3adz w3aig w3asg w3aws w3ba w3bg w3bkt w3pf w4ahh wtahl wtahr wiaka wd4alg witaq w4ec wtt wig) wthb wipp wipz w4vv wiwe woSae wana whaaz w6bjb w6caf w6car w6cii w6tm w6yx wSaam wSaat wSadp wSalu wSaxz wSayh wS8bif wSbls w&bno wSboo wSbps wScux wSdkt wSjm wSrj wSvx w8wi w9amk w9ayd w9azy w9bes w9bkz w9bly w9bzq w8cbhj) wIcja wIcjb w9cjn w9ems w9cevn w9dgz w9ebo w%ecz w9ehi w%eji w9eve w9ezb w9gdv w9ghw w9hd w9sm w9um w9yc cm&yb ear96 on4dj ve3scz (Continued on page 60) wSbqu wSbwi wSbwu wScjt wScss wScum

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for statements Correspondence The Publishers of QST assume no responsibility correspondents. made herein by nees, etc., ernment \merican Mohawk Malay- sian Expedition Base Camp, Poeroek-Tjahoe Harry W. Wells (W3ZD, Chevy ) operator with the Expedition, time reported to the League the radio activities of the Expedi- | wish to take this opportunity for the PMZ is dis- fadio Relay and (merican plendid coéperation we have re- up communication with the coast nk the through members at home and Holbrook, KAIAF, Ft. Mills, ider S. M. Mathes, KAICY, R. Potter, W6AKW, Lancaster, nel Clair Foster, W6HM, Car- he operators, Mr. Wells informs m such generous support. likely heard by this time of the PMZ was able to render the gov- Dutch East Indies at the time of m here of the military post com- 1 J. ©. DeQuant, and the subse- nee. Mr. Wells, through Station KAICY was able to notify the garri- nasin of the tragedy, and has since ll official reports regarding politi- for the isolated ing here now that through this inci- ssible by the A.R.R.L., the Dutch will elevate the status of operators in these great islands as our own government f the League. If this comes about ighty proud, and I personally shall er to the attention of the Governor- post. m just e first. opportunity. Theodore Seelmann rtinent Comment from Overseas 13 Seagry Road, London, E. 11 rial in March QST' hits the nail } ead To listen to the average W uld hardly realize that such an ex- of articles on modern station OST JUNE, 1930 equipment had been so ably written by Mr. Hull, It must be a great disappointment to the A.R.R.L. executives, as sponsors of Mr. Hull's work, to know that after twelve months’ working under the new conditions, the position is so little changed. Considering how easy it is to obtain a pure d.c. note, it really is surprising that a good 75% of the U.S. A. stations received on this side still sound like the proverbial band-saw. With regard to “‘off-wave”’ working, only one British amateur to my knowledge has been heard by the authorities working outside the ‘‘ band,” and he found himself a B.C.L. again within twenty-four hours of the offense. This will show you the position in England. Wishing QST every success. Lawrence C. Fuller, G6LB The Far-Reaching Ham Spirit Houlton, Maine Editor, QST: Last June I had the misfortune of being the victim of an auto accident. which left me with a broken back. Up until a few weeks ago I have been confined to the house, enclosed in a cast, which made it impossible for me to do anything which required the least effort on my part. It is during moments of trial and hardship that one appreciates the kindness and friendship of those about him. So through the medium of QST, I want to extend my sincere thanks and apprecia- tion to all of my fellow hams who have been so kind and generous to me during my illness. The fine spirit of fellowship extended by allt hose with whom I had the pleasure to work certainly helped very much in passing away what would have been many a long, lonesome hour. In all districts worked, especially the first and second, I found every ham a real sport, ever willing to do some little thing to make life more pleasant for me. The gang here at Houlton also stood by me in my trouble. The unseen amateur friend is cer- tainly one of sterling worth. _ 73 from a very grateful fellow ham. Phillip Clark, W1BKN Constructive Work on ’Phone Olathe, Kans. Editor, QST: In response to a request published in QST for 1750-ke. stations to send code lessons, I volun-

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Hull. o the Hull's king » little pure | 75% e still y one heard and,” vithin show {yf LB rit \laine 2 the vith a have cast, ‘thing p that lip of OST, recia- en SO those tainly would In all cond, to do nt for me in 3 cer- BKN me Kans. ‘T for volun- More than a score of different Cardwell Condensers were used in equipping the Byrd Antarctic Expedition Be Right The First Time! ee may prove successful occasionally, but in the long run reliance on past performance proves the wisest course. The Byrd Antarctic Expedition, now successfully concluded, used 25 different types of Cardwell condensers. The success attained in maintaining Radio Communication with home and between isolated units of the Expedition is well known, and no comment on our part can add to the glory of these achievements. Cardwell condensers have always proved worthy of the cons fidence of winners and are worthy of your confidence. If you are in need of condensers you can play a sure thing and eliminate doubt— use Cardwells. Send direct if your dealer does not stock. Literature sent on request. CARDWELL =f CONDENSERS andeheet having the ~=6 THE ALLEN D. CARDWELL MFG. CORP. stator plate readily adjustable to permit changes in maximum 8 I Prospect Street, Brooklyn, N. ve capacity ranging from 50 to 10 mmfds, with a constant minimum les Since broadcasting began ‘THE STANDARD OF COMPARISON” 53 Say You Saw It in QST — It Identifies You and Helps QST

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oz X RADIO Z TUBES Since i9is A iO TYPE | C-32" SCREE! RADIO F AM: HEAT HEA o—S Name Integrity is important in your tube selection For ark of recognition, we have reproduced haracteristics that identify genuine CUNNINGHAMS. ible proof of in-built quality T. CUNNINGHAM, INC. Ne rk San Francisco Atlanta Chicago las ae | | gestions published in QS7’. The set uses two ‘l'ype | same lines as before, by starting each with the | on examinations or applications. Besides these Say You Saw It in QST — It Identifies You and Helps QST | teered. During October and the first part of No. | vember I, with the help of my sister, W9UA sent 34 lessons, missing but one night, when lightning became so bad as to burn out the line telephone here. We conducted the lessons one. half hour in length, starting each one with alpha. bet review, then following with sentences sent slowly, and the last 10 minutes running the om. nigraph. About 10 minutes divided into sey. eral periods was taken up by explanation and answering of cards and letters. At the conclusion reports were asked with promise of sending ecard when I came on the air again. About £0 re- ports were received. During November and December I built a new crystal controlled transmitter following many sug- '52’s as power amplifiers, modulated by two $45's With this transmitter completed I came on the air Christmas and up until March Ist sent 50 lessons of an average of one hour in length. The new transmitter practically eliminated BCL in- terference so I ran it from 7:30 to 8:30 p.m. and sometimes later. The lessons were conducted on alphabet, following with slowly sent sentences taken from the Handbook, then running the on- nigraph from 7 words upward to about 15 wordg per minute. Reports soon began to come in from far an wide; 39 states, Canada and Mexico have bee heard from. The set reached out consistentl 1000 miles in every direction and 50 per cent ¢ the time, 1500 miles. Many have claimed 1§ words per minute speed gained, while dozens have applied for licenses or appeared before inspectors. Others have not yet received action there were a great many operating on provisional licenses, capable of doing only about 6 words, who listened and gained up to 12-15 and more. 1 write this to let you know that I have kep the schedules in spite of the fact that my sistel on whom I depended for help when I agreed send, has been sick since December. Anyone securing 25 or 30 of these lesson gained speed enough to read calls and make th grade for examination as proven from reports. have sent each Friday and Saturday since Mare Ist just to give several of the last fellows gettin on a little boost. Now agree with me that 1 7- or 14-me. man has done more to help out th hundreds of fellows who want a little lift getting started, or tell me who he is and how he did it and I'll go his method one better next winter. Keep the good work up at Headquarters. — Marshall H. Ensor, W9BSP-W9UA Office Supervisor of Radio, 2116 L. S. Smith Bldg., Seattle, Wash. My dear Mr. Warner: Believing that you may be interested in some of the amateurinquiries reaching this office, I am for- warding the enclosed letter, dated March 25, 1930. Edwin W. Lovejoy, U.S. Supervisor of Radio, Seventh Radio Distrid

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of No : — ae. Electrolytic and Paper Condensers when RMA Show the line Auditorium — Booth D-50 Atlanic City Capacity. ns one- JUNE 2nd to 6th hy S8MFD neg hak Voltage te 430 Ie ding 4 t £0 re Can Negative It a new Any sug- vo Type o S45's e on the sent 50 th. The 3CL in- -M. and cted on ith the sntences the om- . : ERE’S the real “‘sur- 4 é , : rise package”’ of ze Pere = P a <8 5 the radio industry. The new, vefore = ; perfected Sprague electrolytic 1 action ae ‘ condenser — with the exclusive one- s these ‘4 a . piece, rolled-edge anode — concentrat- iateall : < LO ing 8 MFD capacity into a space of only rye: 134” diameter and 5” long. words, nore. ’ Individual socket mounting makes it instantly . , adaptable to any circuit. Protected vent integral with top prevents all liquid leakage. And because there isn’t a soldered or welded joint anywhere — the Sprague gives you in practical performance the maximum of efficiency. It has the endorsement of the leading ‘‘hams’’ for transmitting use (names on request). Write t for information of special interest to “‘hams.” ports. joe SPRAGUE SPECIALTIES CO. that Offices & Laboratories: Quincy, Mass, out t Factories: North Adams, Mass. getting e did it a eee inter. sree Ts. W9UA

Radio, , Wash.) some of am for- 5, 1930. Radw, Distria

Say You Saw It in QST — It Identifies You and Helps QST

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\, ‘, it would be \ FATAL to lose The difference It's a far cry Land to the home But even part the privilege of rRALAB to furnish the volume millions of receivers Is your CCENTRALAB Control > | YARBED wire - trenches - dug-outs field set and a th in strand of wire between control and lack of control may spell life or death to an entire brigade from No Man's comforts of your in your radio set control plays a vital and it has been CEN- controls of radio radio equipped? Centralab Central Radio Laboratories 20 ~, Keefe Ave., and Humboldt MILWAUKEE, WIS. TRANSMITTING and RECEIVING PARTS and TUBES... Biegest Discounts lo of AC and D¢ imateurs » parts, kits, nd cabinets of merit always 12 brands of tubes. ical Information and Advice by Seattle at Chicago and New York Prices WEDEL COMPANY SEATTLE, WASH. 110 and ELECTRICAL JOBBERS SINCE 1888 | | | ! Say You Saw It in QST — It Identifies You and Helps QST Federal Radio Supervisor: Dear Sir: Am enclosing a diagram of spark transmitter. ~ « ~ - v . — Ae )ix [Groend. Is a license required to operate such a set and isit unlawful to operate such a set within the state? Would you please send me a complete set of rules governing radio communications? Thanking you in advance. A Suggestion Detroit, Mich. Editor, QST: I have just read with interest the letter by Charles Manley of Summit, N. J., with reference to rag-chewing. In this connection it occurs to me that it is about time QS7' did something to bring together those amateurs who are not primarily interested in traffic. I think this everlasting “QRU C U later,”’ coming as it usually does im- mediately after two stations have made contact, is the main reason why so many amateurs have turned to radiophone for a change. Personally I am most interested in experi- mental work and have been devoting a consid- erable portion of my spare time during the past twelve months to aircraft radiophone communi- cation experiments. This leaves me compara- tively little time for ham work, and while I am always glad to accept an important message for relay or delivery, I do not feel that I must accept the unimportant messages which take up most of the time of our traffic stations. Granting that traffic work is excellent training for any operator, it cannot be indulged in consistently except by operators who can keep regular schedules and be on the air for a reasonable time at least every other day. My amateur interest is about equally divided between telegraph and telephone but I think probably I get the most enjoyment out of a good rag-chew or exchange of interesting information. I also like to hook up with other amateurs who are willing to check transmission tests and who are competent to give an accurate report. During the past twelve months, however, I have not QSO’d more than fifty amateurs of this type and 75% of them have been working in the 14,000-ke. band. In the past it has been suggested that a special tf

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Smitter, Aerial nd is it State? set of Mich. er by rence to me bring 1arily sting Ss im- tact, have peri- nsid- past 1uni- yara- | am » for cept st of that itor, by 1 be ery ded ink ood on. vho vyho ing not ind ke. ial A NEw LINE OF TRANSFORMERS Again ACME leads in transmitting apparatus Here's a brand new line of transformers and chokes for transmitting stations. Back in 1920 when C. W. power began, Acme was the first to have the transformers ready for the tubes. Again Acme pioneers in trans- Mmitting apparatus, this time with a line developed after years of experience and by studying the needs of the amateur and the transmitting station. Note the construction of this new line and some of the features exclusive to Acme. There's the porcelain insulators on the high tension termi- nals; there’s the strong metal case in which the trans- formers and chokes ~ for fransmission are submerged in insulating compound. All these transformers and choke coils are insulated to (and tested at) 5000 R. M.S. (7000 peak) between all high voltage windings and ground. No more worry about the power supply failing just when you have an important message. Send for Bulletins 110 and 111 and learn all about this new line. You'll want to have this information on hand when you get ready to im- prove your station. Just fill in the cou- pon below and mail it to the Acme Ap- paratus Corporation, Cambridge, Mass ACME APPARATUS CORP. Cambridge, Mass. Gentlemen: Please send me a copy of Bulletin 110-111. Depr. Q1 Name Addres s City - State Say You Saw It in QST — It Identifies You and Helps QST

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‘an you turn back pages of time? | 1920 series of OST — | you have not — you are Even 1922 and 1923 ng scarce. And copies be- Well, let’s change the | | | ym now QST copies of bt will be just as scarce. of QST appreciates its | We are daily reminded he many requests we get pies, many of which we probably later this year looking for a certain 1930 You had better resolve keep your copies in a wire tasteners iry to mutilate Opens and lies flat position One-fifty each postpaid ill keep your QSTs always | protect them for future use. l-looking binder, too. QST | Park St., Hartford, Conn. Say You Saw It in QST — It Identifies You and Helps QST general call be assigned to experimenters or rag- chewers and I strongly second this suggestion, — C. H. Vincent, WSRD-WS8XB. Hi! 735 Purdy St., Birmingham, Mich. Editor, QST: You might tell me, if you can, whether the last vestiges of our famous and virulent fever ever leave the veins of an erstwhile victim. For lo, | had thought the persistent bug completely gone, but his devious ways surpass the understanding of man, selah! Yesterday I came across QST in the library, and turned its familiar but strangely different pages. Therein I came across Redding- ton’s picture of a station of by-gone days. My eyes felt slightly misty and my throat a little tight. A few years ago I was one of the regulars and although always more of an experimenter than operator, the love of the hobby is about the same, as you know, in both. Putting myself through college and working at the same time has taken all of my energy for the past four years. But it’s all over now, and I'm a full-fledged liar —I mean lawyer. The other night, however, I must needs tear the broadcast receiver to pieces, and put it to- gether again. There’s something infectious about the feel of a soldering iron, and the smell of burn- ing resin. Oh well! Send me that Handbook. I’ve gotta see where things stand. — John C. L. Cowen, Ex-8BYR. The Off-Frequency Problem Dryden, N. Y. Editor, QST: For the past few years QST has been stressing the perils of off-band operation of amateur trans- mitters. This has been especially true during the last year, since off-frequency operation has be- come an international crime. This has been a good thing and been heeded by those who pos- sess anywhere near the normal intelligence. However, recent developments seem to indi- cate that there are a few in this amateur radio game who do not seem to be able to comprehend the magnitude of the offense of off-frequency op- eration. These few should realize that someone is going to get hurt hurt bad. The worst of it is that the innocent will have to suffer with the guilty if this situation continues, These people who continue to operate out of their proper chan- nels should realize that they are almost sure to be causing interference with very costly services. Those who operate transatlantic stations are losing money when their operation is interrupted. I am told that it costs about five thousand dol- lars an hour for each hour these stations are caused to stand by. Now this brings us to the question: what will be done about it, who will do it, and what can the amateurs in general do about it? In the first place the government will have to take drasti¢ Pla Gri Pla Pla Plat

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lich, last ever lo, I ‘one, ding T in gely ling- My little : and than ame, ough aken it it’s -— | . tear it. to- ibout burn- gotta BYR. m N. Y. essing trans- ig the as be- een a Dp pos- » indi- radio -ehend cy op sone is of it is th the people - chan- eto be rvices ns are upted id dol- ms are at. will ean the ie first drasti¢ ~~ RADIOTRON UV — 849 MODULATOR, AMPLIFIER or OSCILLATOR | psec who operate phone transmitters of medium power will find that Radiotron UV-849 is a very effective modulator. Its characteristics have been so designed as to make it particularly suited for use with oscillators operating at plate voltages of from 2000 to 3000 volts. The high quality of phone transmission obtainable through its use will gratify the most exac ting amateur, Then too, Radiotron UV-849 will give remarkably smooth and stable performance when used either as an oscillator or as a radio frequency amplifier at frequencies below 3000 kilocycles (wave-lengths above 100 meters). Filament Volts 11 Filament Amperes 5 Amplification Factor 19 Modulator Oscillator and RF Power Amplifier Plate Volts . . . . + ~ ~ 2000 3000 Max. Max. Operating Plate Voltage Grid Bias Volts ..... 87 -132 Modulated DC Plate Volts . . . 2000 Plate Current (ma.) . . . . . 60 100 Non-modulated DC Plate Volts. . 2500 Plate Resistance (ohms) . . 4000 3200 Max. DC Plate Current (ma.) . . . . 3= 350 Plate Dissipation (watts) . . 300 Max. Max. Plate Dissipation (watts). . . . 400 Oscillator Input Watts for each Power Output (watts)... . . . . 350 UV-849 (Mod. Factor 0.7) . 110 36350 ENGINEERING PRODUCTS DIVISION RCA VICTOR COMPANY, INC. 233 Broadway, New York, N. Y. Representatives in Principal Cities Say You Saw It in QST — It Identifies You and Helps QST 59

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FOR PURE D.C. POWER SUPPLY P. R. 866 Fil. Volts - 2.5 Fil. Amps. - 5 Peak Inverse Volts - 5,000 Peak Plate Amps. - 0.6 Voltage Drop - - - 15 Overall Length 6/2” Overall Diam. 234” Price - - $8.00 r the new regulations all ri { :mateurs must use an ade- ely filtered D. C. current R. 866 and P. R. 872, both iry vapor rectifiers, besides ing a wave form easy to filter, h a stable source of plate volt- full load or no load, because tubes possess a low and prac- ily constant voltage drop. The ually long life of the P. R. 866 P. R. 872 is due to the low oper- temperature of the oxide d filament combined with the emely low voltage drop result- from their mercury content. e these Perryman rectifiers, uus for their rugged strength, bringing your station in line the new regulations. ractive prices for licensed amateurs ELECTRIC CO., Iwc., North Bergen, N. J. find money order ¢o, $ check > at $18.00 P. R. 866 at $8.00. ..Station...... State Say You Saw It in QST -- It Identifies You and Helps QST action, for this sort of thing cannot be allowed to go on. Amateurs must realize right now that something has got to be done —and done quickly. It must be realized that the surest way for the government to correct the problem is to prohibit amateur radio entirely. This puts the problem in the hands of the amateur to correct his own problems, and at once, if he is to continye to exist. The air will have to be policed, and by the ama. teurs themselves. I would like to suggest that a number of amateurs, who possess the necessary frequency meters to determine the limits of the bands, be appointed by the A.R.R.L. to act as police of the amateurs, in much the same manner as the Official Broadcasting Stations are ap. pointed.* These stations could notify the offend. ing stations and also the Radio Inspectors. I am sure that if this were done, and the amateur knew that they were being watched and r. ported, there would be very little off-frequency operation. Let me say that in all fairness to the conscien- tious amateur, something has got to be done about these outlaws. Amateurs should remember that it is the duty, according to law, of each and every one to report any of these violators that they chance to hear. If they do not they them- selves are equally guilty with the offender. This business is a serious thing — let us get under way right now and somehow, someway do away with this off-frequency business. — John T. McWatters, WSCBK. * The A.R.R.L. Official Observers, two or more in each Section, do just this work, their reports being coérdinated at Headquarters so that necessary action may be taken against persistent and flagrant offenders who jeopardize amatew privileges. — Eprror. Calls Heard 51) (Continued from page 14,000-ke wlasf wlava wlbbe wlbil wlbl wlcek wlcow wlda w2adp w2byr w2exl w2dta band w2ajj w2amm w2aow w2bbe w2bia w2ff w2ja w2ov w2rs w3aiz w3dh wiwe wSced wslo wSn w9bef w9def wO9dhp w9dgz w9eap w9wt ce3ci ct7aa ex7 g5ml g5wt g6wt lulbz ludd fSex f8fem fSswa g2gm g5by lu2fi lu3fa lu7je luSdj luSdy oa4q on4bt on4thj on4jj pyls 2ay py2az py2ll py2ik py3ak pyied pyler py2ad py2ak py py3aq pySia ve2bd zstm exewk W6EQO-W6BBY, F. C. Thompson, 155 N. Canyon Blvd., Monovia, Calif. 1759-ke. ‘phone w9byq w5kq w9bfx w5ibky w9xv w9dky w9bfy 0% W2AJP, Norman B. Krim, 227 Haven Ave., New York City, N. Y. emlby cm2xa emS8le emS8uf emh2 emz51 ctlbd ctlep ctlke d4aez earS2 earll3 fS8dz helfg helle k4kd k5dd ké oklna on4tuy vk2hk vk4hu vk3bq vk3ga_ vkik vk4bh vk4do vk5it vk7ch zllbn vk2ns Elliott C. Hagar, 30 Adams Ave., West Newton, Mass. 14,000-ke. band celah ce3ag em5fl em8ux whekw w7je emS8yb ctlaa ctlbt ctlby ctlew exlaf cx7 d4rh ear21 ear96 ear98 ei2d e® fSaw fSdmf fSer fSgyn fShr f8kz fSlgb f&gyn fShr fs fSleb f8sm fm8cr fmSgke g2fs g2ip g2oq g5by g5bz gon

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wed to w that | done st way m is to : ts the e prepare correct yntinue me ) to meet the that a cessary . of the P act as manner are ap Model 301 Voltmeter with REG | I A I IONS offend- 2500 or 3000 Volt Scales. I am nateurs und re § O quency NE of the new regulations which the Federal ’ Radio Commission has recently adopted with ynscien- . » in reference to the amateur is that he must keep an nember - ; accurate station log showing, among other things, ach and — the input power to the last amplifier stage in the ors that jn ° Fae case of a multi-tube transmitter, or the watts ‘ them- % input to a self-excited oscillator. pr. This = The new regulations also state that the amateur ay with ; . must use “‘an adequately filtered direct current "SCBK aa power supply or its equivalent.” hook = Model 301 Milliammeter These regulations now in effect require that the n against 100, 200 or 500 M.A. Scales. amateur should be able to properly adjust his amateur equipment to conform with them. But before the amateur can do so he must be provided with meters of suitable characteristics and proper ranges for accurately indicating the voltages being applied to his tubes and the current he is drawing from them. da w2adp xl w2dts Oe ott For this service Weston offers three new instru- Slo wal 0 . ° aon ial ; ments of the famous Model 301 design equipped bz lu2d : na with Bakelite cases — shown in the illustrations. n4jj pyls Dik py3ak For complete descriptions and instructions in the use of these meters write to the factory direct, addressing your inquiry to the Radio Engineering Department. Model 301 Rectifier Meter for measuring A.C. in plate supply — 500 Micro- ampere A.C. Scale. ‘es (Op ~ —~ PIONEERS SINCE 1888 Weston Electrical Instrument Corporation 602 Frelinghuysen Ave., Newark, N. J. Say You Saw It in QST — It Identifies You and Helps QST

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== _=— PracTicaE PRACTICA. RaDio RADIO. ene VN These three books cover the entire field of building, repair- ing and ‘‘trouble-shooting’’ on | modern broadcast receiving sets. The Library has been brought right up-to-the- nute in every respect, including the very levelopments in the design and manu- equipment. The recent interest in shor reception is reflected in a section which | dea h the construction of this type of receiver. | | THE RADIO CONSTRUCTION LIBRARY Thr mes, 6 x 9, 993 pages, 561 illustrations | | | T ’ embody not only a thorough home- t a ready means of reference for the iotrician. Step-by-step information is | ible-shooting," installation and best tone quality, distance and selec- ption from all types of sets. | juipment, such as loudspeakers, an- ry eliminators, chargers, vacuum profusely illustrated throughout. NO Y DOWN SEE THESE BOOKS FREE mply clip and mail this coupon McGRAW-HILL FREE EXAMINATION COUPON Met Hill Book Company, Inc. ’ h Avenue, New York e Radio Construction Library, three free examination. I agree to remit an $1.50 at the end of 10 days and $2.00 a f $7.50 is paid — or I will return the davs Balkite | Chargers + Eliminators Radios PARTS AND SERVICE ELECTROLYTE WRITE FOR INSTRUCTIONS A. F. MARTHENS COMPANY Factory Representatives rtlandt 4489 54 Dey Street, New York — Say You Saw It in QST — It Identifies You and Helps QST g6vp g6wo g6yt hafSb helfg he2jce he2jm hafS8b k4kg k6ewb laig laih lu3fa lu3pa luSac lu9dt nj2pa nnInic oa4j oa4l oa4q oadr ondfp on4ft ondgn onthp on4jk ondmy on4vu oz7y pa0qf pylaa pylaw py2ik py2az py2bg veda ve5aw vo8ae voSaw vo8me xig xwim 2zllao zl2bx gl4ao zs4e zuin ex-W3AVJ, J. G. Houck, 319 Walnut St. Pottstown, Pa. 14,000-ke. band g2em g5by g5ml g6rb g6ut fSex fSfg fShe fmSrit on4jj onthp on4ro earl0 ear37 ear96 ear98 d2ce d4rh ctlbx ctlby ceSag lu2dj lu3de pylem py2bf helfg k7mn cmS8uf velam veico veibp vetbx veick veigk vetgl veicu vetic whacl wébsp w6cln w6cxw w6dev w6eak whegh whejc wéff wince whue wafr w7alb w7ff w7fh w7fl w7li w7sg w7vy paOzf 14,000-ke. "phone band wiagr w9anz w9qy 7000-ke. band emz53 k4kd k5do x29a hafkx w6ac w6bhy wé6bi wébne wiby wécar w6cjn w6cxe w6dni w6doz w6dyn wé6eks wéet} w6ks w7ahw w7nv w7vy 3500-ke. "phone band w3cv w3jz w3aex w2gj w2iu wSazk wSaju WSAFK, Mr. J. Lawrence Evans, Jr., Danid School Observatory, Franklin and Marshall College, Lancaster, Pa. wlaar wlaky wliegr w2aca w2amb w2apf w2bec w2bn w2boz w2bp w2ckj w2fr w2ga w2iu w2ji w2ju w2qn w3ain w3as w3avw w3cgb w3cz w3jf wthn wSahz wSaos wSbrr wSbwx wSewu w9bg w9elx w9nm W2CBB, H. J. Conti, 15 Harbor Terrace Drive, Rye, N. Y. 7000-ke. band w6ahp w6akd w6akf w6ass wiawp w6bam wé6bas wébfe w6bef wibqq w6by w6cgx wé6cii whcrz wicto wicxw wéezx w6dcu w6dhe w6dpj w6dyj widzu w6ebg w6ec wheke wheva w6ky w6sf w6yx w7acf w7ahw w7nr k4aan k4acf ktkd d4aez cm2jm cm2ro em2xc em5fl emSuf nj2pa nm9a nmxda nninic nn7nic velda ve2bb ve3bt ve3gt ve3xk vetcu ve%ap ndb wsq W8LA, Ralph E. Jackson, Box 226, Frankfort, Mich. 7000-ke. band ti2rs kidd k4dk k4kd k6ewb k6alm emS8yb emSle emSde helfg zllft zlife zl2dg zl2ac zl2bg¢ vk2jh vk2hm vk2hl vk3hu vk3pr vk3wx vk3jk vk3pm vk4bh vk5it vkShg vk5jo vk5wr vk7ch pxr g5ml 14,000-ke. band qqla py law , = , W1ZB, Carl J. Madsen, Chicopee Falls, Mass. 7000-ke. band wind w6axm w6bqk wéicbp wécnn wé6cug whdiz wédpj w6dyn w6eva w6cxw wiequ w7acf w7fb w7lz w7vy w7aag emS8yb fllaw nj2pa 14,000-ke. band w6aqj w6cyi w6dev w7be w7na w7ty em5ecx cmS8uf ctlbs helfg helle ktakv lu2aa lu3dh lutda luS5ak oa4j ontuu vethg vetic voSme W2BKZ, Charles T. Kolz, aboard S.S. “ Toltec, United Fruit Co. Steamship Service Off Florida coast 7000-ke. band w9azy w3arp wSnp w9ph wShv w9cph w3amz w3bnu woaxt wSrt w5za w2dp wSbex w9kd w3anh wS8cuq webo wis wSuf w4ik wlbjl ve3cz At anchor, Puerta Cortez, Jan. 31, 1930 whave w2bai w3aws wiei w2ags wigd wSlt w5ajl w5w) wlahl w2cvj wSaav w5aea wirz w5aqy wSddg wiqe west wftt wilt w9ahe w9bhh w2ard w3awm w2gg w5ae w5azd w5bdd w9fqs w9kb wSafm w2aof w4afw w6eqk w2bse wiha

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“We found over a period of two years that CeCo Tubes were | ic ¢ : cane the most profitable to handle in more than one way.” - = ALBERT A. LIST, List Brothers Distributors, Fall River, Mass. ) Zita St., e e ncreasing use of high- ii thp by sag ir ‘| quality phone transmitters by amateurs created de- mand for rugged, long-lived, a powerful modulator tubes + ..- capable of withstanding heavy overloads and high i voltages. The new CeCo 250 . Tube with its rugged fila- ment, high emission, small grid current and super Dd YOU KNOW! ’ BL. TheCeCo million dollar e f y l4 acres wai Poe's Vacuum is well adapted for | Pantin the world devoted aclusively to the manufac- ‘i ture of radio tubes. h ° 4 connie this service. ™ CeCo has pioneered in such tube achievements as ‘oltec,” Jie B-409, B-406, “G,” FRANKLIN S. HUDDY, Assistant to Chief Engineer, “H,”“K,” Hi-Mu, the A.C. Co ; idenc Rowe Grid 236 tube and CeCo Manufacturing Co., Inc., Providence, R. I. the A.C. Pentode. " OSs oo cnrn 1930 America, snd fii = Ce Co maawe Fuses u Saw It in QST — It Identifies Yo nd Helps

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w9apd w6abd w6cgx w9dce wSke wSbkp w2eaz w2pc wifp w3bsj wSduw w9bkz w3ake w9dwr w5bhq w9fey w4ahq w5akp w4hd w5bex wicm cmiby nninic xlmq cm8yb zzlbb x5z W1MS, Charles H. Horton, 173 No. Adams St,, Manchester, N. H. } 14,000-ke. band ceSaa em5ecx emS8uf ctlaa ctlbx fSes fSda fSex f8fr f8fk g2a0 e2kf g5by g5bz g5ml g5mz helle he2jm he2jo k4kd lu3de nj2pa oalke oa4r on4ft on4gn onthe on4jj pylca py2ba aqla ve2be ve3rf vetbu vetbx ve4fk vetfr ve5ao vk3xo vk3dy vk3pa zxda Do You want to be a High Class Radio Operator? You can be a Clear, Fast Sender, able to work with the best of them. You can be a Rapid, Accurate Re- ceiver, able to copy the fast typewriter. The Successful Methods used nd highest paid Radiomen are taught to The Candler System of ae Speed Telegraphing t Course of intensive training for developing nd Sending Speed quickly through Scientific t trick theories). It trains the Brain, Muscles » Co-ordinate in doing fast, accurate work. the power of Concentration; gives you fence by making you sure of yourself at all times. hat your speed now is, we guarantee to increase W9ASV, Charles E. Perry, Motor Route 3, Boz 821, Joplin, Mo. celai ce2ab ce2ac de2ak ce2bm ce3bf ctlbx ct3ab f8aap fSer {Sep f8fe f8id fShl fShr gS5by e5yg g6hp g6xb kfr5 k4ni k6etf no4uu pylaa pylaw py2ak xpaoja xpaozz xij x9a xbx zllal zllfb zl2aw wfat rwx wsq W. A. Bousfield, York St., Bellerive, Tasmania wlajt wlajy wlamj wlanz wlerw wirw wiry w2abu w2ahz w2ait w2arb w2bda w2bjg w2ct w2dab w2jw w2qf w2re w2tp w3aiz w3aur w3ja w3qv wiabw w4ft w5afb w5dyk w5ql w5ry w6asl w6awz w6bax w6can w6dnx w6dzm w6eug w6fk w6qy w6vz w7qr wSaz wSavp wS8dsi w8xk w%auh w9beu w9dgz wef w9eta w9fbv w9fxj ac2ff ac3ma aulkab bam celah celav ctlaa d4abg dian d4by d4uak d4uj d4yt ear21 fSalp fSda fSdmf fSdo f8dot f8fr fSgdb fSgua fSho fS8ix f8jf fSolu f8rrr f8sm fSwb w8zx g2bm g2od g2sw g2xv g5bz g5by g5uq g5owp e5yx g6dh g6hp g6nt givp gbwy gorb g6ut haf8b j3ch klhr kipw kise kixa k4aan kfr5 oh2nad ok2ny on4bz on4fe on4fp on4hp on4il on4ja on4jj on4us on4vo on4ww o2z7t oz7y pb7w pk3bm smé6ua ti2hv un7ww uosx velar ve3aq ve4dj x9a x9b rwx wfa nd stations and on ships at sea are successful ho have taken and are taking the Candler m I owe my speed (55 wpm) to your System." , . World's Champion. “Can copy fast stuff behind easily. Radio-Typing Course is best for Raymond H. Bell, U.S.S Idah ho. Thousands of these pour into our offices from all over the mo substitute for the Candler System of clegraphing. » get out of the “slow class” and do something, ther information about this great Course and » done for over 45,000 operators. Give your i and tell us what you want to accomplish. it Radio-Typing Course. The CANDLER SYSTEM CO. Dept. RL. 6 South Kedzie Avenue Chicago, Illinois Experimenters’ Section | (Continued from page 33) would be of great interest to many amateurs. Another thing — if you have an idea which you think ought to work, but which you haven't the time or facilities to try out, send it in anyhow — someone else may be in a position to try it, and it may turn out to be good. If you have a problem which you can’t solve you will very often find POWER SUPPLY that someone else has found a solution, so if you let us know about it we can often make mention of it and bring forth a lot of responses. In other Amateur Stations are words, look at the “‘X’’ Section as being a clearing row compelled to emit a house for ideas and helpful kinks, and remember pure tone signal. This can that if you are interested in knowing what the ‘a other fellow is doing, he is probably just as much only be obtained by use of interested in hearing what you have done also. an efficient Power Supply. The only thing which can ever destroy the use- fulness of this section will be lack of material, REL CAN ASSIST YOU and we have no doubt that the average ham has WITH YOUR POWER enough ingenious stunts to keep us going for years SUPPLY PROBLEMS and years. Just how good we make it is up to all of us.who are doing things and overcoming diffi- WwW : . i RITE FOR LISERASUSS culties every day in the course of our radio life. C—O RADIO ENGINEERING LABS. More Progress on 28 Megacycles INC. (Continued from page 32) 100 WILBUR AVENUE in the T & R Bulletin. We will present a few LONG ISLAND CITY, N. Y. items of interest. i20D copied W9EF solid on February 2nd Say You Saw It in QST — It Identifies You and Helps QST

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fSix r5bz r6ut hy 4vo 108sx Accuracy Even to 2 of 1% The new Durham wire-wound precision resistor can be secured to an accuracy of ly of I% _.. made especially for uses where accurate, high value, non-inductive, low distributed Capacity resistors are re- quired. Data sheets of this and other resistors sent gladly upon request. Please mention types and values in which you are interested. RESISTORS & POWEROHMS INTERNATIONAL RESISTANCE CO. 2006 Chestnut Street, Philadelphia, Pa. Say You Saw It in QST — It Identifies You and Helps QST - : - : Ncocinsnadieiasamenconts ages ait dieder aite eae )

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!! STOP Use Potter Replacement Blocks and By-Pass Units for Service Work To Give The Old Receiver New Life This Is The Difference Which The Set Owner Hears THE POTTER CO. North Chicago, Hlinois »nal Organization at Your Service Motors back geared 110 A.C. variable speed, fi auto reversible (Socony oil burner type) has over one thousand uses, a very | a buy . A w base 600, 900 or 2000 ohm . $ .50 200 Se DON a 6 cinntnide ooas 1.00 variable W _— Leonard, 500 ohm .2 to » GaES GOR. GMO. ncccccapegece 5.00 vari: able, Ww Dod Leonard, 6 ohm 15-5 a ere err 3.50 n W, Ae Leonard, with jleads, ass. sizes 4.50 110 or 220 volt) %& silver contacts. 7.50 w voltage, 2 upper and 3 lower rews, 3 contact arms ee as itact screws OF AFMS......6+++s- wliophone, C.W. 926 ates 15,00 Corps, type B.C. 104. 1000 to 3000 tector — 15.00 175 775 meters. * Especially recom- ndby"’ for coastal Broadcast stations De pt of C comme rece — 50.00 Ke a. Model T. 1% cu. ft per min. 600 rs P.M., i2s- Ib. Requires 4 h.p.. 3.00 R&M,110 D.C s4%h 2 kw., 20 volt Great for large station | tbny supply. 125.00 MANHATTAN ELECTRIC BARGAIN HOUSE DEPT. Q, 105 FULTON 8T., NEW YORK | | | | while BRS250 reported the same station with ex- | treme fading! On February 9th G5WK heard only W2JN and ZS4M whereas BRS250 heard | six W stations and ZS4M. These incidents are mentioned to show that accurate and complete reports on signals are necessary. Locations sepa- rated by only a short distance may alter reception remarkably. It seems from perusal of reports that barometric conditions enter into the scheme of things on 28 me. Therefore it would not be amiss to keep close tabs on barometric pressure and general atmospheric conditions. NKF is logged in England on both 28 and 32.8 me. G5YK reports the signals from this station rl0 on the latter frequency. In general there ap- pears to be a great deal of interest in the British Isles on 28 me. From an early report in the T & R Bulletin we are reprinting the W and VE stations that were worked or heard (during the tests) in the British Isles and Europe. (Stars denote number of extra times reported.) WI1BJD, W1ZL****, W1CMX**, W1CPB Wane. va, W2NM****, ae W2ACN ******* W2FF, W3CKL, W3AQI** W4AKT* W6BAX* WS8DIV*tteseessees WSAPD*, WsADM*******, WS8SS******, WSAPB* W9EXW*******, W9BZG, W9DGK, W9EQV, W9BYC***, WOAZZttttttttt444 WOE Fttt***444444444 W9BBA 444444444444 444442% Atlantic Division Convention Erie, Pa., June 27-28 ELLOWS, here’s what the Erie Amateur Presi Club is planning for you during the two day convention to be held at Erie, Pa., June 27th and 28th. The convention proper will be held in the Hotel Lawrence with many side lines to attend. Speakers you read about and wished that you could hear will talk on subjects close to the hearts of the amateurs; moving pic- tures, illustrations, demonstrations and visita- tions will be the order of the day. On Friday, the 27th June, the gang will have the privilege of visiting Presque Isle State Park (this park is not a sheckel grabber) where there will be swimming in Lake Erie, boating, sports, walks, talks and a fish luncheon. The Radio Inspector will be pres- ent to give license examinations. A.R.R.L. Head- quarters are sending F. E. Handy, the Communi- cations Manager and A. L. Budlong, Assistant Secretary (the same Bud of PRR fame). The best of it all fellows is the price — only $4.00 for the two days, but if you send in your reservation by June 17th, the price will be $3.50. Send in your reservation to Raymond Wagner, Secretary Erie Amateur Radio Club, 707 East Fifth Street, Erie, Pa. 66 Say You Saw It in QST — It Identifies You and Helps QST a = — a

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BARGAIN

sero adjuster. 4 in. diame-

267. Double aes ee S0-0-58. D oa meter, Weston No. 267,

12 500 cap. .004 $12. 50 to 20.00

ne 08 ei OSA, 1800 ohm. 12 henry $2.06 66A, 85 ohm, 1.3 henry 7 64B, 11 ohm, 1 henry Largest Radio and Electric Supply House in U. ur particular requirements. ers. NO C.0.D. ON CANADIAN ORDERS. DU DO NOT ISSUE CATALOGS MANHATTAN ELECTRIC BARGAIN HOUSE, Dept. Q, 105-7 Fulton St., New York City

Generator, airplane, Signal corps, with shaft, can be used M. as motor, 12 volt 33.6 amps. 5000 R.P.M......... $10.00 Generators, 12 volt, 60 amp. has automatic controls. ..... West. Elec. Dynamotor, C.W. 927, two D.C. 32/350 volt dynamotors in noiseless hangar. Used in parallel gives 160 mils at 350 volts, series gives 80 mils. 700 volts, suitable for xmitters and receivers. New low price West. Elec. swtchbd. control panel for above dynamotors, has switches, 0-50-5000 voltmeter, complete filter system, etc. Special ; - Ammeter, Weston No. 425 thermo-couple 0-2 amp., mtd. on large bakelite base with D.P. hi voltage switch Ampere hour meter, Sangamo, battery charge and dis- charge, type MS 0 500 scale, capacity 15 amp , Milliammeter, Westinghouse, 0-150 surface mtg., b. con. Milliammeter, Westinghouse, type, C.A. 0-500, zero adjustment, flush mounting. $10.00 value.......... Voltmeter, Westinghouse, type C.A. 0-25, zero adjust- ment, flush mounting. $10.00 value : Motor ge ner rator, Crocker Wheeler or Holtzer “abot, “110 D.C. 220 A.C., 500 watt, 500 cycle. Ball bearing Complete Sas 500 cycle motor generators 4 to 5 K.W. Transformers, General Electric, 125 to 2500, with center Ss PG SUES Sanciccdadeccceeeenes Transformers, Simon, 220 to 11,500 closed core, & K. W., 500 cycle, “ pancake” secondary Transformer, Amertran, oil immersed, 1 K.W., 500 edie, TI lg le ei ae Condesa, transmitting, Mure jock .0017 ‘mfd. 12,000 volt, ideal for plate blocking ions Condenser, Dubilier, mica, op. volts 12,000 cap. .0004.. . Condenser, Dubilier, mica, volts 40,000 cap. .0012-.001-— -0008 or .003 . . se% Condenser, Dubilier, mica, op. volts 8500 cap. eee Condensers, West. Elec. 21 A.A., 1 mfd. 1000 volt A.C. test . see eeccese Condensers, Grid, with leak, mica Dubilier (Aircraft) 003 mfd. 1500 volt, 15,000 ohm. Headphones, West. Electric No. 194W same asc Ww. 834, 20.00 20.00 10.00 5.00 5.00 5.00 $0.00 7.50 5.00 10.00 2.50 10.00 30.00 10.00 1.00 2.50 2200 ohms, D.C. slightly used Serr 5.00 Holtzer Cabot, “Mike’’ Utah type, carbon granular . EE A a ee 95 Western Electric Radiophone Transmitter unit, 326W. Special ae : 1.50 Dynamotor, aircraft 32/275 volt, with shaft........... 10.00 NAVY Dynamotors General Electric 24/1500 volt. 233 = mills. (Extended Shaft — $3.00 extra)............... 37.50 Edison storage battery cells, nickel alkali, 225 amp. hour, 1.2 volt type A-6, weight per cell 20 = te . 4.00 Induction coil, platinum contacts, can be and as Hi. ‘pitch BND sb he 6co56004-60Reksndeseedensedeseseeseues 1.50 Telegraph and Senne poreadle : sets . mahegsuy case, 2 tone 4 contact platinum contact high frequency busser, 2 telephone toggle switches, | ge sending key, 3 mfd. condensers, transformer and 2 choke coils, receiver, $30. value : 5.00 Magnetos, Army mine and ringer type, 4 large magnets. . 1.00 Sounders, Signal Corps, 120 ohms, adjustable. . a 2.50 Spark transmitter, complete, airplane type, rotary gap, transformer, mica condenser, 200 watt 900 cycle with Gen. self x-cited ball-bearing. ................00. 35.00 Generators, Westinghouse 110 volt, A c “900 ode. 200 watts, self excited Med bisekonestenenees 15.00 Generator 4% kw. 500 cycle, 300 volt, self x-cited, can be RNS soo ce tienksesdbeceses exeeneeenehes 25.00 Voltmeters, D.C. portable new Weston model 45, 3 scale 0-3-15-150 guaranteed \ of 1% accurate <a 40.00 Ammeters, D.C. portable, new Weston model 45, 3 scale 5—15-150 with 3 scale external shunt ~F leads \% of 1% accurate eee 40.00 Loud Speaker Unit 193 West. Elec. Ideal or monitoring. SE, SED Es 26 ee wei canennceevesaenes 5.00 Headphone, Army, with strap, 120 ohm............... 75 Headphone, Radio School, leather headband, 75 ohm.... 1.50 Keys, transmitting, Navy, back connected on bakelite base. 2 kw., %-inch silver Gels + 5.4 + dn beekenun 5.00 Keys, xmitter, 2 kw., comb. relay and hand %” silver contacts PYPeT eT eCT TTT Cet 10.00 Keys Navy, \” silver contacts jeasbnaee 1.50 Charging panel, Navy type, S.E. 899, 32 volt, Ward Leonard, var. and fixed res., Weston voltmeter and ammeter, Sangamo ampere hour meter. Complete with all switches . 30.00 Buzzers, Western Electric, Extra quality, high frequency 1.50 Receivers, Navy, C.N., 240, 1000-10,000 meters 50.00 Receivers, S.E. 143 and I.P. 500 : ceueaed 100-150

ARMY AND NAVY RADIO SURPLUS

Lightning Switch, High Grade W.E. Heavy Copper Blade and Contacts. Size 7 x 8 x 6 high. While they sts

AT LAST — Genuine Western Electric Hand Microphone Home Broadcaster. $3.50 used, $5.00 new.

Portable Hi-speed Universal Ham- ilton-Beach Drill, takes up to in. Complete with Chuck, ut and Grind Attachment

NEW LOW PRICE Dynamotor 32/350 volt, ball bear- ing, 80 mills. Special... . $12.58

U. S. Army Telegraph Set, key, sounder, D.P.D.T. switch, 2 large magnets, in portable canpens case. Less Batteries. $6.00 S. specializing on Army and Navy Surplus. Sufficient postage and deposit of 20% r E TO LIMITED GOV'T SUR LUS WE uired on Say You Saw It in QST — It Identifies You and Helps QST 67

ee een Set eee ea NT eA a aS ee

Page 84

LURIEMA, tnc. « Export Managers ntifically equipped onomically export sendable receiving (ranmemitting radio apparatus

send volta Ohm meter “2 68

SHUNTS Build Your Own Multi-Range Volt-ammeter Rey, a4 _ a : y “2

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Ow- dis- ‘lay hed HE 7 © * thy The Allen-Bradley plant, private sub- station and electric furnace building face vpon four streets, assuring daylight in all deportments “ There's a Big Plant and 25 Years of Resistor Experience | } a xs | 175, 2 i a ae RAN ytd \ ME \\ f y Sales offices ore located in all leadingcities.Con- sult your nearest Allen- Bradley district office. back of the huge production and uniform quality of Bradleyunits HEN radio was popularized, a few years ago, the Allen-Bradley organization had already achieved distinction as producers of electric con- trolling apparatus and resistors. To meet the demand, at that time, for a reliable filament rheo- stat, millions of Bradleystats were sold to radio manufacturers and amateur set builders. Today, Allen-Bradley Fixed Resistors—Bradleyunits —are used by the world’s largest set builders. Floor after floor of automatic machinery and pre- cision testing equipment, under the supervision of skilled engineers, produce Bradleyunits in stupen- dous volume. Such facilities are your best insurance of a continuous supply of reliable resistors to meet your specifications. ALLEN-BRADLEY CO., 277 Greenfield Ave., Milwaukee, Wis. Produced by the makers of Allen-Bradley Control Apparatus Say You Saw It in QST — It Identifies You and Helps QST

Page 86

Your A.R.R.L. EMBLEM The League Emblem comes in four different forms. Its use by Mem- bers is endorsed and encouraged by the League. Every Mem- ber should be proud to display the insignia of his organization in every possible way. THE PERSONAL BLEM. A handsome creation in eavy rolled gold and black 14"' high, supplied in lapel yr pin-back style. The per- mblem has come to be known sign of a good amateur. It es you — in the radio store, radio club, on the street, trav- you Can spot an amateur by r your emblem, OM, and take roper place in the radio fra- Either style emblem, $1.00, \UTOMOBILE EMBLEM. , heavily enameled in yellow k on sheet metal, holes top ttom, 50c each, postpaid. EMBLEM CUT. A mounted : electrotype, the same size as rsonal emblem, for use by rs on amateur printed matter, ids, cards, etc. $1.00 each, JUMBO" EMBLEM. How the shack wall or that 100- Think of the attention this llow-and-black enamel metal m will get! 19 x 8%’, same Automobile Emblem. $1.25 ostpaid. Che American Radio Relay League Hartford, Conn. | | LA.R.U. News (Continued from page 34) We regret that we have been unable to secure any picture suitable for reproduction in the de- partment this month. Several have come in, but they all possess some inherent defect which makes it impossible to use them here. So many good and interesting photos are too dark, or too small, or are not of the glossy type, and as a result cannot be used. We solicit pictures of all sorts; stations, oper- ators, officials of I.A.R.U. sections; anything and everything of general interest to the readers of this department. If they are suitable they are al- most certain to be used. BELGIUM SECTION By Mr. Paul de Neck, President of the Reseau Belge On the two active bands, the DX conditions were much better this month and good records were made. On the 14-me. band in the beginning of Febru- ary the best hours for DX were certainly from 0700 to 0830 G.M.T. and from 1400 to 1700 G.M.T. Midday work gave good results with \ustralia, India, New Zealand, and some U. 8. districts. The following contacts were made: ON4BC worked ZL and W stations in the early morning. In order to have good juice when he got up to punch the key, he made a very pleasant use of his alarm clock! A few hours before time came to get out of bed, a special contact. would switch on a re- lay and put his batteries on charge. Hi! ON4FP continues his good DX work with VU and ZL stations, being received RS by ZS5S. ON4HA worked W, FR, and CT2. ON4UY is received R4 by VK5HG. On inside aerials, the following contacts were made: ON4WC worked EAR and SP with 20 watts. ON4GK has been received R7 by XGAOB (Shanghai, China.) On ‘phone ON4KIR is RS at I1SS at Napoli, Italy. ON4HU had his good modulation received R7 in the Baleares Island (Atlantic). ON4GK had his fone received in OH, HB, F, SP, and Sicily (Italy.) ON4HY worked the North African coast on ‘phone, being received R9. He uses an m.o.p.a. of 60 watts, a Zepp aerial, and a modula- tion system known as the “Beauvais.” ON4FT would be very glad to sked with all hams for working from his auxiliary sailing yacht ‘“‘Tenac- ity,” which will be on with the call letters XON4FT, during the beginning of next June. Every QSO will be acknowledged with a good photo of the ship. Wave: 14,000-ke. band (upper part), d.c. note, m.o.p.a. set. ON4UU continues his DX ’phone tests on 14,000 ke. working Brazil, India, and Australia, being received on the loud- speaker on several occasions. On code he worked Say You Saw It in QST — It Identifies You and Helps QST

Page 87

cure de- but akeg and |, or not per- and 3 of al- au ns “ds "u- ym

Leeds aitenien MONITOR For checking your note, its stability and whether D.C. or not. THE ONLY SURE CHECK. Gives you an accurate idea as to what your signal sounds like to the other fellow. The

shield, 5” x 6” x 9” overall. Completely shielded, with bat teries self contained Supplied with A. & B. batteries, but without 1-UX. Special 109 tube ° $15.00

ceeds Monitor ie Qs Jhe Home of RADIOW—— 45 VESEY STREET NEW YORK Headquarters for Transmitting Apparatus When in Town Visit Our Store New York’s Leeds Microphone STANDS Beautiful copper oxidized finish, Very sturdy con- struction. Artisti- cally designed, ef- fective appearance.

Pik om $4.75 Bass = $9.75 Adjustable to 7 feet

Make your own transmitting and re- ceiving coils. Copper tubing transmit- ting inductance.

Leeds 50 watt socket speciz ally ‘getend. See previous issues of QST for details.

EVERYTHING IN

Size of tubing ACME JEWELL PYREX S NEO GLOW Inside Dia. 3/16" 1/4” 5/160’ BRADLEY FLERON ) LAMPS 21/8” 9c 10c 12c* THORDARSON Super Sensitive 2 3/8” 9c 10c 15c* _T TAT T/ for wave meter and other 31/8” 10c 12¢c 17c* ELEC TRAD NA I [ONAL ’ © } uses; candelabra base. % Prices per turn LYNCH SIGNAL watt, 56 inch diameter. ati FLECHTHEIM 13% inch long overall. Thordarson B-Eliminator $1 65 NATIONAL RECTOBULB eer rere $4-75 Transformer ......... . GENERAL RADIO P Porcelain base e socket for above Thesderpon oS watt $3. 95 CARDWELL ee IN STOCK Aluminum Shield cans and panels of

every description to order.

Leeds Filament TRANSFORMERS All primary windings for 115 volts, 50-60 cycles. Extra heavy construction, will stand considerable overload. Heavy end castings. Type — L.F. 30 — secondary 7% volts centre tapped; capacity 30 watts. FUSER. cc ccccvesosesese . L.F. 80 — secondary 12 volts, centre tapped, ~< e: ; , 8 ) — Price $6.50 L.F. 175 — secondary 12 volts, ome tapped, capacity mA. $9. 75 watts. L.F. 25 — secondary 2ig volts, capacity 10 Price. ...., 94-80

Special LEEDS lead n bowls made of Pyrex. Twq cups size 34%" dia. x 24%” high; supplied complete with 18” bra ass rod and hardware. Price $2 complete . erry peeeene a Larger size cups 6” dia. x 4%” high; complete set two cups, hardware and 24” brass rod. Price complete °

We are in a position to supply all parts necessary to enable you to conform with the new current regulations

DUBILIER HIGH VOLTAGE FILTER CONDENSER 4 MFD. D.C. Working Voltage 600 V These Filter Condensers are designed for use in filter circuits in Transmitters, and all high Voltage Socket power de- vices and Power Packs. SPECIAL $2:

TYPE PL 571 List Price $7.25

THORDARSON DOUBLE FILTER CONTAINS TWO 18 HENRY 250 MILL CHOKES Heavy duty, rugged double Filter Reactor for Filter Circuits in T rans- mitters, Power Amplifiers, ‘“*B” Eliminators and various other pur- poses. € Each Choke has a 2000 Volt insulation and the D.C. resistance of each Choke is 108.5 ohms. ( When connected in series this Filter Re- actor has a capacity of 36 henries at 250 mills, and when connected in parallel 18 henries with 500 mills carrying capacity. SPECIAL $6§-25

MODEL T-2458 List Price $19.50)

LEEDS RADIO LABORATORIES Precision Custom Built Short Wave Receivers and Transmitters This department under the supervision of the Short-Wave Specialist Jerome Gross. We design, construct and advise on any material for the ‘‘Ham"’ Broadcasting station or laboratory. Write Jerry Gross for advice on any of your problems.

PLEASE PRINT YOUR NAME AND ADDRESS PLAINLY to AVOID DELAY

WRITE FOR SPECIAL PRICE LIST MAIL ORDERS FILLED SAME DAY 10% Cash Must Accompany All C. 0. D. Orders

Say You Saw It in QST — It Identifies You and Helps QST 71

Page 88

Patent Pending TwoNew Contacts for You Ouy ( yr f them is shown above —the new ie yelet Contact that is now a standard part f every HH RESISTOR. It has been uni- ally approved by Electrical and Radio Engineers for its effective reduction of contact ince through increased, Axed contact areas veen wire and terminal log other new contact is the one that we wel- e between your organization and ours. We em iking RESISTORS for an impressive list leaders in the industry. There are definite sons why you should be among them. May ell you what they are? Hardwick, Hindle, Inc. 218 Emmet St. Newark, N. J. HAMS! WE PAY THE POSTAGE Oh. i: ae H A L a. 9 ~ Bontiune, OMPLETE STOCK OF HAM SUPPLIES t Prices Write for Literature Thordarson — R.E.I - Flechtheim — t a. erryman Jewell — Readrite — Pi Frost Hammarlund Gen, k a aa Books — Ohmite — Fleron. t the latest Handy and Hull Hand- ¢ in bound form — $2.00 per copy, 2 a copy of this new sixth edition, look ent copy and determine if you want your more permanent form. HILET line of adjustable gap Giant new same dollar value that Coils with the r nclormers popular thruout the world. 160 MA, 22 Ib., 500 00. MA, 22 $12.00. 50H, OH-320 MA. 25 ib, $14.00. 15 H, $16.08. 3H-4000 MA, 22 Ib., $12. isformers 500 watt, 1000-1500 each side, 0 watt 500-750 1000 each side, 1 watt 325-375 each side, $9.00. Fila- Tapped primary $6.50. Specials mounted with leads. For De i with fuse and terminals add $3.50. Plates for transmitter panels engraved ! 2.00. Blanks, 75c. Write for specifica- Itage Prices are One Day delivery 1ILET ENGINEERING CO., Orange, N. J. ———$q—— the habitual DX, and made his first contact with Japan. Up to now the following records are listed at the R.B.: ON4FT, WAC — 73 countries worked. ON4RO and ON4UU, WAC —70 countries worked. ON4FP and ONARS, worked. ON4ZZ, WAC — 63 countries worked. ON4HP and ON4JJ, WAC —51 countries worked. WAC — 68 countries Last Sunday, March 9th, the hams of the Re- seau Belge met in a splendid ham fest, beginning in the morning by a visit to the laboratories of the control Center of the Union Internationale de Radiophone, conducted by Mr. Braillard, the world known radiotrician, President of the Union. Mr. Braillard presided over our lunch and our general annual meeting of the afternoon. The evening before, Mr. Braillard gave us a very interesting and vivid lecture on the actual technic of short wave radiophone stations. We had the very great honor and pleasure of enlisting Mr. Robert Goldschmidt, the radio pioneer, and Mr. Braillard as members of honor of our society. At the end of our banquet, a big cake of almonds and honey representing a super-het with loop aerial and controls, was presented Mr. Braillard as acknowledgment of his good work in ruling the congested European ether in the matter of broad- casting and introducing the splendid stability which is now the principal quality of our broad- casting stations. Please, my foreign friends, do not forget to en- list yourselves for our July next big International Amateur Congress in Antwerp, Liége, and Brus- sels. Don’t lose this good opportunity to visit your Belgian radio friends. BRITISH SECTION G6CL, Hon. See. R.S.G.B. & B.E.R.U. The chief matter of interest to record during March is the successful manner in which the 28-me. band was used. On behalf of the council of the R.S.G.B. I wish to thank very cordially all those overseas amateurs who assisted our Con- tact Bureau stations in their efforts to probe the mysteries surrounding the semi-ultra high fre- quencies. The premier 28-me. contact with Rhodesia (BQ2BH) was made by G6LL on March 2nd; this station was also heard in Brazil on the same day. Many successful QSO’s were made with SUSRS but except for March 9th North Ameri- can’s were badly received. The Powditch Trophies will be presented to the winners of these tests at the next R.S.G.B. Con- vention. On 7 and 14 me. work accomplished. The W.B.E. certificate is now being issued and has been awarded to many British & Colonial By J. Clarricoats, there was no outstanding 72 Say You Saw It in QST — It Identifies You and Helps QST ‘oro Oe ee PSD oOo ft a OZ cree oOo WMmr ia oo

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at e- ng he d il IY SY to Get into his BEG $60 705125 “, A WEEK Radio Operator ‘Swiss? 7 A DAY Servictng ana Repairing RadioSets | Goon S hy Bre Pay Joss! Spare True PROF- 1rs! A Fine BusINEss oF YOUR Own! They’re all open to you and other live wire men who answer the call of Rap10. The fastest growing industry in the world needs more trained men. And now come Tele- vision and Talking Movies—the magic sisters of Radio. Will you answer this call? Will you get ready fora big pay job Nowandstepinto a BIGGER ONE later on? You can do it EASILY now. R. T. 1. Home Training Puts You in This Big Money Field Radio alone, pays over 200 M1L- LION DOLLARS a year in wages in Broadcasting, Manufacturing, Sales, Service, Commercial Stations and on Board the big sea going ships and many more men are needed Television and Talking Movies open up other vast fields of money-making opportunities for ambitious men. Get into this great business that is live, new and up-to-date, where trained service men easily earn $40 to $50 per week, and trained men with experience can make $75 a week, and up. Easy To Learn At Home— In Spare Time Learning Radio the R. T. I. way with F. H. behind you is Easy, INTERESTING, really Fun. Only a few spare "hours are needed and lack of education or experience won't bother you a bit. We fur- Schnell, the ‘“‘Ace of Radio” nish all necessary testing and working appa- Home Training candoforyou. 4 ratus and start you off on practical work you'll Mail the coupon for FREE 4 enjoy—you learn to do the jobs that pay real Book Now i money and which are going begging now for RADIO & TELEVISION INSTITUTE § 5 want of competent men to fill them. 4806 St. Anthony Court. Chicago _§ Address......... R. T. A. *® * ' TRAINS vou AT HOME FoR A GooD Jo8 OR A PROFITABLE 1 o Be Be PART TIME OR FULL TIME BUSINESS OF YOUR OWN 1 AND uP Radio Engineer Jor Broadcasting Station BB S Right at Your FingerTips WHEN YOU ARE RTI. TRAINED IN RADIO-TELEVISION Talking FRED H. SCHNELL Chief of R. T. 1. Staff Twenty years of Radio experience -F irsttoes- tablish two-way ama- teur communication with Eur: e. Former Traffic Manager of American Radio Relay League. LieutComman- der U.S. N. R. Inven- tor and Designer Radio jo Engineer. Now in charge of F I Radio youwill like his friendly er of helping you realise your ambition. Tt. &. eae YOU TO MAKE MONEY AND ITS SERVICE KEEPS YOU UP-TO-THE-MINUTE ON THE R. T. EWEST DEVELOPMENTS IN RADIO, TELEVISION AND TALKING PICTURES ; attny in aie vel ia \" Fal \ REP pu \ Prchures Amazingly tae Results You want to earn Big Money, and you want some of it Quick. R. T. I. “Three in One’”” Home Training— Radio-Television-Talking Movies— will give it to you, because it’s easy, practical, and is kept right up-to- date with last minute information. In a few weeks you can be doing actual Radio work, making enough ExTRA MONEY to more than pay for your training. In a few short months you can be all through— ready tostep into a good paying job or start a business of your own. A Big Josp—Big Money—A BIG Future. There is no other business in the world like it. Investigate—Send For R. T. I. Book Now Don’t waste a minute. Find outwhat the great Radio industry, which has grown faster than the Automobile and Motion Picture business, has to offer you. Find out what other menare earning. SEE How Easity You CAN GET STARTED. Get the facts about Radio, Television and the Talking Pictures, firsthand, in the big R. T. I. FREE Book. Learn what this R. T. I, **Three in One’”’ Say You Saw It in QST — It Identifies You and Helps QS T “Tune In On Big Pay’ three-in-one Home Training (without obliga- ting mein any way). ee ne RTI Training BringsBugJobs Like These! TRA MONEV eons ry oA ae A has enabled me arnover ot vara fmonths. Thisis is an pare time a ork. 7 7 haere opens tion with my father in o' Bost you all the credit for the above. —J. NOFFs eee, R. » Box 37, Greenville, Ky. 3 } / MAKES $25 A my | I make as high as $25.90 r day and 00 in 2 months from a I’ only 19 and in a small town. You did all you ea sai you would and much .— FLOYD KNISELY, ee Box 91, St. Joo, Ind. a + RAISED 33 Sangaes 1a NU nigh Sipe Gon, detribpe ie for Ev Receivers CSome. and anhand)e., wi alary of al 1-3% since en a 4 —Eaar_ P, Gorpon, NGS. =. 6th St. Oklahoma City, Okla. RADIO & TELEVISION INSTITUTE Dept. 10-A, 4806 St. Anthony Court, Chicago Send me Free and prepaid your BIG BOOK ’and full details of your

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1920 1930 ae Radio Shortkut WBSAI tried old way, stuck at 8 per. Used DRS and sed to 25 per — spare time two weeks. wol unchored at 10 per. Used DRS and soon copi »t 25 per. Now Chief at KMMJ. Dodge High Speed W5AHM raised speed from 27 to 39 per in 75 min- ut practice sessions, 15 minutes each. Dodge Morse Shortkut KI MIXUP— Both codes now used by W2BX Y, WS5A V, WS8CIK, WSBFA, W9EBF. IN LEAST TIME Wi ast Effort will qualify for Code Exam, Han r Commercial — any grade METHODS $5 each or SET (3) one order $10. Mor Order C.O0.D. and Postage in United Sta f remit One Dollar. Box 101 Mamaroneck, N. Y.

P duo Lateral < OILS I plete line lard turn referred by oratories Write for informa- tion and prices PACENT ELECTRIC CoO., Inc.

(€)) All You Need to Lears /TELEGRAPHY, Morse or Continerita/ with en

Telegraphy the world's fascinating profession — ‘ring real messages — them. Interesting — you learn quickly — {Ff lex is the Master Teacher. y U. S. Army, Navy and na radio and telegraph or Folder Q-6. ELEPLEX COMPANY rtilandt Street, New York ol vite f

ACENT

91-7th Avenue New York Ci CC

| amongst them D4CC, amateurs who have worked some part of the Brit- ish Empire in each Continent. (Note North and South America count as one continent.) Arrangements are being made to interest the Boy Scouts of the world in amateur radio; a scheme has been prepared whereby our members form pivotal stations for training purposes. Any suggestions from overseas will be appreciated. The B.E.R.U. continues to extend and if present plans mature an All Red Empire Route | will shortly be in operation for the passage of ex- perimental messages, and we dare to hope later, the passage of loyal greetings to our Patron — H.R.H. The Prince of Wales. To the many overseas amateurs who read these notes we would emphasize that we are at all times pleased to receive applications for membership into R.S.G.B. or B.E.R.U. and we shall be glad to forward to all such interested persons a copy of our monthly bulletin. Our address is 53 Vic- toria Street, London, S.W.1. GERMAN NOTES By Dr. Curt Lamm, D4AFA. It is with the greatest pleasure that we are able to report that amateurs in Austria are to get their licenses without further delay. Up to now, the following are officially licensed: UO1JZ, UOLTN, UOLJF, UOLJN, UO6GR. Some more are to follow shortly. On this occasion, the terri- tory of Austria has been divided into different dis- tricts, which will be numbered subsequently. A detailed report on this will follow in our next report. D4UAH, Victor Gramiah of Munich, has suc- ceeded in establishing contact with W2BG on 28 me. QRK mutually varied from R3-R7. D4AUAH was using 15 watts. During the last period covered by this report, conditions on 14 me. seemed very favorable. Many of the D’s hooked: up during evening hours with our fellow amateurs in the United States, D4XN, D4ADF. In day- light good conditions for VIX and ZL traffic were observed, and D4XN established many QSO’s with that part of the globe. On “40” conditions were fair in early Febru- | ary. D4AEZ of Staaken near Berlin reports much DX, and D4GJ of Beuthen got in touch with SUSWY on 1.5 watts. QRK R35. A few OM’s were busy on 3.5 me. among them D4KZA of Berlin, D4ABV of Breslau and HB9MQ in Northern Switzerland. We hope that some more stations will QSY to 3.5 me. in order to reduce QRM on 7 me. DUTCH NOTES Assistant Traffic Manager, N.V.LR. By H. Pomes, On the 3500-ke. band European communica- tion increases and many hams seem to find out all over again that this narrow channel can be used Say You Saw It in QST — It Identifies You and Helps QST

Page 91

ee ww

ee SAMSON POWER BLOCKS Double Filter No. 713 Chokes Contains two 30 henry 80 Mill Chokes This heavy duty, rugged, dou- ble Filter Choke is excellent for all types of filter circuits and experimental work in receiving sets, power amplifiers, eliminators, transmitters and various other purposes. | HANH Made by General Electric Com- AA pany for Radio Corporation of Mt

America, and is RCA Replace- " IM | ; ment Part No. 8336 for the a DELIVERS 180 VOLTS D. C. CURRENT Radiola 33, 18 and 17. iN i AT 120 MILLS Each Choke has a 1000 Volt IW Nil insulation test and the D.C. resistance is 500 Ohms. ii i In addition supplies Filament Current for UX-280 and two UX 171 A Tubes. Also contains two When _ connected in parallel chokes. All being necessary to build up a power these double Filter Chokes have pack is Filter Condensers and Resistors. a capacity of 30 Henries at 160

Mills, and when connected in 7 F 7 series have 60 Henries at 80 - ‘bane! “0 Operates on 110 Volts, 60 Cycle A. C. current. Mills. Size: 54 x3%x2% List Price : $10.05 Fully shielded in metal case with special insulating compound. Made of the best parts, including the highest grade of silicon steel. List $25.50 SPECIAL $6.50 SPECIAL $3.50 Rated at 30 Watts

250 Watts THORDARSON Volauze Power Transformers For UX-250 or 210 and UX-281 tubes This Thordarson Power Transformer delivers There is also a 3 Volt Center-Tapped Filament 4. B and C current to two UX-250 or 210 Power Winding on this lransformer which can be used if tubes and “B" current to a Receiver. desired with 2 4Volt tubes by means of a resistance. . Delivers full wave rectific ation, using swe UX The primary of this Transformer is designed for 81 Rectifying tubes. Has two /.5 olt | 550 os use on 50-60 Cycles AC current and has taps for 1 apped Filament Windings for the two UX-250 or line variations from 100 to 125 volts 210 Power tubes and also two 7.5 Center- Ta »ped » 7 » , , > > pa 3% ” Type T SPECIAL $§-75 Sizes Veight: 1 Ibs. List Price: $20.00

POTTER HIGH VOLTAGE CONDENSERS 13 MFD. D. C. WORKING VOLTAGE 600 V. Tapped at 4.4. — 4. — 1. Mfd. An excellent Filter Condenser for Type 1603-A. use in Transmitters, Power Amplifiers, etc. Size: 64" x 4%" x 4”. List Price : $20.00 SPECIAL $4-50

DUBILIER FILTER CONDENSERS, Type P. L. 571 — 4 mfd. 600 Volt D. C. Werking, near. List $12.00 .... Special $2.28 THORDARSON DOUBLE FILTER CHOKES. Type T 2458. Each choke 18 Henries — 250 Mills. List $19.50 : 6.25 WESTERN ELECTRIC MICROPHONES. Breast Type (without straps) . . : $1.25 SAMSON 3000 Ohms Double Head Sets. List $8.00 $2.50 FILTER CHOKES. 30 Henries—120 Mills, D. C. resistance 400 Ohms. mfd. by Chicago Transformer Corporation. . ans . $2.25

HORDARSON Valoees Power Transformers For UX-250 or 210 and UX-281 tubes.

This Thordarson Power Transformer delivers There is also a 3 Volt Center-tapped Filament A, B and C current to one UX-250 or 210 Power Winding on this Transformer which can be used if tube and B current to a Receiver. desired with 2% Volt tubes by means of a resistance. Delivers full wave rectification using two UX-281 The primary of this Transformer is designed for Rectifying tubes. Has a 7.5 Volt Center-Tapped use on 50 to 60 Cycles AC current and has taps for Filament Winding for one UX-250 or 210 Power line variations from 100 to 125 Volts. tube and a 7.5 Volt Center-Tapped Filament Wind- This large, rugged, heavy duty Power Trans- ing for two UX-281 Rectifying tubes. former has been tested at 2500 Volts he A. C. Voltage Plate Winding is 1125 Volt Ideal for Transmitters, Power Amplifiers, Re- Center-Tapped at approximately 125 Milliamperes. ceivers, etc ype T : Size: A a Ssisne - SPECIAL: $4-50 Waght: 83 ibe List Price: $18.00

AMERICAN SALES CO., 19-21 Warren Street, New York City onhhinniiciddind

Say You Saw It in QST — It Identifies You and Helps QST

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ANKRUPT ADIO STOCKS LLY GUARANTEED 30 day replacement guarantee, No. 210, $2.35; No. 281, $1.85; No. 280, 95; $1.25: No. 224, $1.25; No. 227, 75c; No. 226, 75¢ = Foo UX type, y erTr ansmitter, adaptable for phone or code. accceccoecoeseeocoees $14.7 ve Sets, one tube compte te with 5 coils, “st 3 nator, Dry. 180 volts, will operate up to 1G ants tube, fully guaranteed $6.75 iS Power Condenser Blocks, 12 Mfd., 1000 t, tapped 2,2,2,4,1 and 1 mfd..... $4.75 mde nser rae 2000 volt A. C. test 1500 vt. -. $4.95 $7.90 $3.80 D Chokes, 30 henry each, 160 mils., ‘ Pow er Filament and Choke Pack... .. nN 003 Power Transformers, shielded, Sec. 600 V. me 250, one 227, four 226 tubes and : wee $5.00 \. B. C. Power Packs, completely assembled, $8.75. has A. C. filament for up to 9-tube set. B eliminator. Make your battery set all iki your A. C. set around this pack. s pack, 95c extra. on Transformers, 1 tol............. $1.00 CHAS. HoODWIN Co. (240 Lincoln Ave., Dept. F-8, Chicago, Ill. IN BANKRUPT RADIO STOCKS My, i, MM, Ml, A, Ml, Ml, Mn, Ml, Ml, Mn, A, M.A, de, ERS > * » > > * > . 4 > » > . ‘ 3 »

It's EASY to Get a HANDBOOK (Sixth Edition) DIRECTIONS: Realizing that Handbook must be had, proceed as follows: Fill out below, tear off. Reach in pocket, produce U.S. A. $1 bill, old or new size (we don’t care). Clip together, mail us. Handbook Factory, 1711 Park, Hartford. SEND IT AT ONCE.

(Name)

(Street or P. O. Box)

(City and State)

for both ‘phone and code work with low power at relative big distances. On 7000 ke. good continental communication was possible during daylight, but with many ‘phone stations it is the old story. After sunset only a few stations may be heard and no good QSO’s were made. Only on March 7, 8, 9, 10, were fine DX stations heard, and these were in many cases worked. The 14,000-ke. band offered many occasions for working all continents, especially on the dates mentioned above; on other days no stations could be logged after sunset. Usually VK and ZL may be heard early in the morning; after 1400 G.C.T. many stations in Asia were worked; from 1700 to 1900 G.C.T. South African stations come in FB. Then, under favorable conditions, American stations are very loud till midnight. We can state with great certainty that a western wind and higher temperature bring in more stations during the night than an eastern wind together with a lower temperature. PAODW< still belongs to our star stations and worked all continents several times. From the 28,000-ke. band we can only report that a few American stations were logged during the tests organized by the R.S.G.B. Our annual meeting was held on March 16th in Utrecht. A new committee was elected. Our new President is Mr. J. Corver, one of the out- standing figures in Dutch amateur radio. Further, a beginning was made with coéperation between the N.V.V.R., the oldest radio society in our coun- try, and the N.V.I.R., the Dutch L.A.R.U. Sec- tion. When a final solution of this problem shall have been effected, we shall announce it in these notes. Of course, the day was ended in a real hamfest; the greater part of the Dutch hams had dinner to- gether, and proved that Old Father Ham Spirit has many children among them! NORWEGIAN SECTION By G. H. Petersen, LAID During March most Norwegian hams have been active with European contacts, and generally re- port fair conditions. There seems to be a tendency to make medium-distance rag-chewing contacts on very low power in preference to DX-hunting. LAIG reports, however, a and VK fine 0700-0830 G.C.T., and W, ZS, ZT, 1700-2000 and has done a lot of work on v7 t me. LA2K is using a portable 3-watt transmitter on week end trips signing XLZ2Kk, and would wel- come reports. LAIJ, our most active Bergen station, working on 14 me. is mighty proud of having QSO’ed the fair and famous SP3YL, having even been prom- ised her photo! He reports very variable condi- tions. At headquarters we are preparing for the gen- eral meeting which is to be held in Oslo early in August. We expect a good representation of active Norwegian hams, and any foreign OM who may 76 Say You Saw It in QST — It Identifies You and Helps QST

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i ee A a a Se) The Amrad Mershon Electrolytic Condenser can well form the basis for an unusually effective and economical High-Voltage Filter Circuit for your Short Wave Transmitter. In the past few years, more than 3,000,000 of these condensers have been incorporated in the Radio Receivers of Thirty-one Prominent Manufacturers. These features of the Amrad Mershon Con- denser commend themselves particularly to builders of high-voltage power supplies for short wave transmitters. Self Healing — Not injured by high-voltage surges. High Capacity — Up to 72 Mids. ina single unit. Needs No Attention — Can be forgotten, once installed. Long Life — Guaranteed for One Year — will last many. Does Not Create Heavy Charging Surges. Will Absorb Unusual Keying Surges. Costs Less than the Ordinary Condenser — of same voltage rating and capacity. Send the coupon for detailed information showing how you can use the Amrad Mershon Filter Condenser in your transmitter. The Amrad Corporation ee 210 College Ave. |A BETTER FILTER FOR HIGH VOLTAGES AT LESS COST RS lt 0 SS E RSH NDENS Th ¥: ye why aa E A tegen, watnene or0 ON MRa on : meron Corona" — ) Medford Hillside, Mass. ee Please send me detailed information regard ing the use of the Amrad Mershon Condenser [| “°° °°°°*****"*""" in filter circuits. : og Aree Attached is a diagram of the equipment with which I wish to use it. A is wens THE AMRAD MERSHON FILTER CONDENSER IS MANUFACTURED ONLY BY THE AMRAD CORPORATION THE AMRAD CORPORATION Medford Hillside, Massachusetts Say You Saw It in QST — It Identifies You and Helps QST

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7 5 98000000008 OOOOOOOSOCO rhe NEW Easy-Working GENUINE MARTIN VIBROPLEX No.6 e Marke: Vibroplex: Bug: Lightning Bug IN COLORS: Blue —Green — Red Black or Colored, $17 Nickel- Plated, $19 Martin Radio Bug — Extra large, Specially mtact Points for direct use without re- lored, uro ld Vibroplex accepted as part payment mit by Money Order or Registered Mail rHE VIBROPLEX COMPANY, Inc. 825 Broadway, New York City Cable Address: ““VIBROPLEX"' New York Graduate from the Mediocre Class h a prize station backed by that most power- THE MERCURY ARC. Most miles per to operate and replace. Fil: amentless. No fz alling ring long life. Heavy duty single and polyphase 866, 872 and arc duty. Filter and interphase efficient than brute force. | tation a sure winner — Here's How RECTIFIER ENGINEERING SERVICE | WSML 48 Rockwood Rd Cleveland, Ohio \ — en (7) complete sets (two books, ing six issues, to a set) of the 1926 X) of QST. They are specially > per set, postpaid. They will go TRANSMITTING COILS Features— Interchange- able 20-40-80 meter bands; 4% and'4 in. wide heavy mbbon wound on grooved bakelite framework; very rugged! Distributed capac- ity of these coils very ow! Ideal for Fone, MOPA or Xtal circuits. GRID COIL and mounting .. .$4.50 Price $7.50 Extra coils each 3.50 Ss Rand Wanted When Ordering and whether for Will Ship C.O.D. if $1.00 enclosed with order Arthur unzi RADIO MGANUFACTURER W6BY¥ REDLANDS, CALIFORNIA visit our town during these days will be heartily welcomed to our hamfest. PORTUGAL We are very glad to learn from Eugenio de Avillez, CTIBE, that the Rede dos Emissores Portugueses has been recognized by the Portu- guese government as representing the amateurs of Portugal, and has received an invitation to nominate one of its members for membership in the council of T.S.F. It will be recalled that this active amateur organization is to be voted upon in the June Calendar of the I.A.R.U. for affilia- tion with the Union. It is gratifying to note this triumph, and we extend our congratulations and best wishes for the future. The WAC list is being held over until next month. Getting that D.C. Plate Supply (Continued from page 16) Rectifiers, Hot-Cathode Mercury-Vapor Electrolytic Condensers and a High Voltage Rectifier, page 31, March 30 A New Type of Rectifier Tube for Amateur Use, page 21, February '29. Rectifiers, Mercury-Arc Three Phase High-Voltage Rectifier, page 37, February '30. Mercury Are Rectifiers, page 8, August ’26. Mercury Arc Rectifiers, page 21, January '25. Filters ABC of Filter Design, page 34, April '30. Electrolytic Condensers and a High-Voltage Rectifier, page 31, March ’30. Plate Supply Filters and Keying, page 39, January '30. The Filter Business, page 66, March ’29. Filter Circuits, page 43, August '28 *Notes on Filter Circuit Design, page 27, July ’28. Picking the Right Filter Condenser, page 37, October ’28. *Final Capacity in Two-Section Filter, page 36, February '28. *Middle Capacity in Two-Section Filter, page 27, May ’28. "2 he First Filter Condenser, page 33, September 27. Electrolytic Filter Condenser, page 55, April '27. Ford Coil Filter, page 67, April ’27. Ford Coil Filters, page 43, March ‘26. Amateur Filter Problems, page 24, December ’25. Rectifiers and Filters, page 29, February °25. Smoothing Circuits for Half-Wave Rectification, page 33, August °25. D.C. Filters, page 52, September ’25. Filters and the Motor Generator, page 64, De- cember °25. Mercury Are Rectifiers, page 21, January ’25. Radio Amateur’s Handbook, Chapter VII. ‘5 Say You Saw It in QST — It Identifies You and Helps QST cu set cha “B in | you

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re e, re You Don’t Need a Can Opener to Spread the Ham Bands on the ““Bearcat’’! Throw away your jig-saw, your bolt- cutter and the little hatchet! Using the set as is, you can spread the crowded ham bands all over the dial by a twist of the wrist on the new S-M 737 Shortwave Bearcat. 9.99 Nothing up the “Bearcat’s” sleeve, either— it’s a little midget condenser, built right in, that does the job. And that isn’t all—there’s a built-in power supply, one-dial tuning, a real gang condenser and a screen-grid circuit with two s. g. tubes! There is no longer any reason for not having S-M 737 Short-Wave ‘‘Bearcat’’ a shortewave set comparable to a broadcast receiver. Yet there’s nothing on the 737 just because A Real Auto Receiver! it’s “pretty.” Perfect battleship shielding— The new S-M 770 “Playfellow” is an auto receiver that’s the starting point. Then there are two _ that’s built not only to stand the gaff but to give real double-shielded tuned circuits, a regenerative “console model” reception. non-radiating detector, and a powerful °45 It’s small (12” long by 7%" high and 6%” deep), sensitive (5 microvolts per meter), screen-grid (three s. g. tubes including detector), and has a standard S-M 810 illuminated drum-dial—a pocket edition of the finest receiver, specially designed for its job. : ‘ There’s no cutting of cowl or instrument panel to bands. Four extra coils ($5.50 list) cover the — ingtall it. It is readily attached to the car bulkhead American broadcast band. under the cowl to the right of the driver’s seat. Only tests can prove an auto receiver—and the “Playfellow” has consistently brought in distant pro- grams over test rums made on hundreds of miles of second audio stage. Eight specially designed plug-in coils (included in list price) cover from 16.6 to 200 meters—all foreign and American short-wave broadcasting as well as the ham Treat yourself to the best—if there’s any chance of getting Prague, you’ll do it with a “ » ” Bearcat. rough, back-country roads. And it isn’t expensive—complete with built- Priced complete, except for tubes and speakers, in power supply, wired, licensed, in cabinet as $79.50, List. Parts are standard. Priced at $61.40 List. illustrated, the list price is only $139.60, sub- S-M 870 Automotive-Magnetic Speaker (9%” square and only 4%" deep) gives the maximum output of a °71A tube. List price, $15.00. Which means 737’s are going to be as scarce 771 Auto Receiver accessories include all necessary as “Dodos” for a long time to come! Better get installation equipment except tubes and batteries. your order in to your jobber now. List price, $16.50. ject to usual trade discount. the very latest developments of the laboratories, is too valu- Silver-Marshall, Inc. able for any setbuilder to be without. Send the coupon for a 99 West 65th St., Chicago, U.S. A. free sample copy. If you want it regularly, enclose 50c for Send your latest catalog, with . 2 isane . : , ee soak a 1S-M Service S hei , sample copy of the Radiobuilder. of Authorized + M Service Stations are being operated. Ml r ‘ Write for information on the franchise. ° Ee send Data Sheets on The Radiobuilder, Silver-Marshall’s publication telling SS Ss 64K ” 2S ST. oe closed; send fi S-M SILVER-MARSHALL, Inc., SMES CTSA Data Sheets (including the 737). ee eT ee SE ae nee aaa ee a SS A TT Say You Saw It in QST — It Identifies You and Helps QST

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| FROST-RADIO ire equipped to pr Frost Radio \ . Controls in wound or type, or counter- ' knob rota- ' ind with absolute in all resis- eradations from ms to | megohm. ( ervice is unique, and satisfying. \ to submit sam- ised on your par- specifications. HERBERT H. FROST, Inc. Wain Office and Factory: ELKHART, IND. EE ee a H. FROST, Inc le Street, Chicago QS.T. 6-30 r Parts Catalog by return mail. I under- will be sent to me FREE and postpaid.

wire element No. 890. Double depth metal shell unit in rheostat or poten- tiometer type. Rotors in same electrical con- nection. Composition elements, 5,000 ohms to 1 megohm in each unit. Diameter, 1 7/8 in. Depth of shell, 1 3/16 in.

a

TRANSMISSION CONDENSERS nd for interesting data and price sheet on , iD Transmission Condensers with working )) following tubes: 203A, 204A, 210, SOOW, Sa ltages up to 3000 D.C. for use with the 51, 852, 860, 865 CORNELL ELECTRIC MFG. CO. Long Island City New York

E <a Massachusetts Radio and | Telegraph School 18 Boylston Street, Boston Send for Catalogue Tel. Hancock 8184 Established 1905 dd

POWER SUPPLY SYSTEMS BUILT FOR YOUR NEEDS as to your needs and we will forward our estimate. ‘ rt Wave Calibrated meter — range 17 to 200 meters....... $12.50 Ay Oscillator 5000 cycles. ..sc- sheet on the two items above. formation Receiving and Transmitting apparatus your exact specifications. VIRELESS EGERT ENGINEERING, INC. New York City ! reenwich Street

| |

Advanced Transmitter Design (Continued from page 28) under the circuit conditions in this transmitter but no promise is offered that they might be satisfactory with tube capacities in shunt (in parallel-feed circuits). Chokes are shown in the key leads as well as in the d.c. grid and plate-feed circuits. The leads to the key happened to be of the right length to pick up some r.f. in the electric field about the trans- mitter but the chokes knocked it out of the keying circuit very effectively. If there is no evidence of r.f. in the keying circuit, these chokes may be omitted. Incidentally, a frequency meter (tuned to the frequency of the transmitter) with a flashlight bulb as an indicator makes a handy gadget for hunting out r.f. in the various circuits where there isn’t supposed to be any r.f. If the bulb glows when the coil is held near the suspected lead there is r.f. flowing in that circuit. A condenser to minimize sparking at the key contacts is connected across the key-jack in the transmitter. It is an old Faradon UC-1015 with the three sections connected in parallel to give a capacity of .0012 ufd. A better arrangement would be one of the key-thump filters described in the Handbook; a 0.5-ufd. condenser with a resistor of several hundred ohms in series, connected across the key, should be more effective. If bothersome key-clicks turn up, use your favorite thump eliminator — just as on any other transmitter. All connections in r.f. circuits (indicated by the heavy lines in Fig. 4) are made with copper tubing excepting the stranded grid and plate leads from the Type '52 tubes. The copper tubing is 14-inch in diameter except the 44-inch tubing connecting the grid coil to the grid tuning con- denser. Other connections are made with No. 14 stranded with rubber insulation and No. 14 bare bus-wire. The filament- and plate-supply connec- tions are made to binding posts on a terminal strip at the back. The open-circuit jack for con- necting the key is also mounted on this terminal strip. The tuning of the transmitter is exactly like that of any other tuned-grid tuned-plate outfit, and the same procedure should be followed. The best operating adjustment will be that at which the grid tuning condenser is set at a slightly higher capacity than the one which gives mini- mum plate current. The tuning of t.g.t.p. transmitters is exceptionally well analyzed in H. A. Robinson’s article ‘Operating Character- istics of Vacuum Tube Oscillators,’’ in November, 1929, QST. (Kilocycles to meters that half the gang didn’t read the story because it looked ‘‘too technical’? — and passed up an opportunity to find out just what makes a t.g.t.p. transmitter tick.) As with any self-excited transmitter, the an- tenna-coupling circuit should be tuned to a fre- quency slightly lower than that of the transmit- ter, the antenna current being about 20°% less than the maximum obtainable. The monitor should be used always as what George Grammer calls the ‘final authority,” and the transmitter Say You Saw It in QST — It Identifies You and Helps QST

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ie A SAFE (ZUIDE in the selection of insulation for Radio Transmitting and Receiving Sets Say You Saw It in QST — It Identifies You and Helps QST VER 300 broadcasting stations, leading radio telegraph systems, the United States Army, Navy, Air Mail, Coast Guard and Ice Patrol Serv- ices, explorers like Commander Byrd, and exacting amateurs everywhere have utilized PYREX Insulators in many spectacular achievements. Regardless of whether you are sending or receiving — on land, sea or airplane — you should be thoroughly familiar with the PYREX Antenna, Strain, Entering, Stand-off and Bus-bar Insulators that are helping these leaders to make radio history. The new PYREX Radio Insulator booklet lists all types and sizes with data that you will want for ready reference. Return the coupon for your copy, and if you want further advice on any insula- tion problem, our Technical Staff will answer your questions promptly. Send the coupon for your copy CorninG Grass Works Corning, N. Y. Gentlemen: I | | | Please send me copy of your new | bulletin on Radio Insulators. | |

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— Reduced Prices On Oscillating Quartz Crystals (Ni2 For Commercial Stations ae PED) For Dealers For Amateurs CRYSTALS yy RECOGNIZED AS THE BE easy fae edearage carefully selected for ut, and ground to your approximate is stated accurately to within one- rceent POWERT YPE 1) Kilocycle band .. $10.00 ycle band .. 15.00 1 blanks 4.00 1 Crystal Holders 6.00 POWERTYPE” tations. cry stals to broadcast inks we furnish grinding instructions. Simply send name, no obligation, for full information on crystals, I R EE holders, blanks, heater ovens, etc. CLEAR AS A CRYSTAL” nerican Piezo Supply Company 1101 ron Building Kansas City, Kansas Specialists in frequency precision oR Ae aaa Guar: janeced — Mounted — Complete 2 ke cach side fe - side eT eer eeeees 50 watt 500—750— 1000 each side mot inted $9.75; mounted $11.5 “rs, Chokes, Polyphase aa 25-cycle nsformers. Add $2. 00 for fil. winding ‘W9CES FRANK GREBEN 1927 *eoria Street, Pilsen Sta. Chicago, Il. t the latest Handy and Hull Handbook und form — $2.00 per copy, postpaid. opy of this new sixth edition, look »py and determine if you want your permanent form. and Voltage Controls. 175 Varick St.. New York, N.Y. '|/ELECY —_——Tnnrnmrnrr BB Built for the Quality-Minded Experienced *“*hams’’— who put quality erformance ahead of price — invariably choose ELECTRAD Resistances BECOME A RADIO OPERATOR See the World, Earn a Good Income, Duties Light and Fascinating LEARN IN THE SECOND PORT U.S.A. ctor located here. New Orleans supplies the various Gulf ports. Most logical location ome to for training. ualify for the various branches of radio } rts of the world. Positions Ashore and Afloat. Day and Night classes. Enrollany time. est Radio School South. Literature on request. GULF RADIO SCHOOL 844 Howard Ave. New Orleans, La. should never be put on the air without first checking the note and the frequency, Fig. 5 is a suggested arrangement ef the same type transmitter for Type ’10 tubes. How about some of the gang building one up and letting us know how it perks? We can’t build all the new rigs here at HQ, you know! The Bandbox Superhet (Continued from page 20) screw-driver from a piece of round fiber or wooden dowel (do not use metal) to fit the screw heads on the neutralizing condensers. i Rs +e7SV. 4 ls f° HII" + DETECTOR COIL SOCKET CONNECTIONS FIG. 3 Place No. 3 coil in the detector and No. 2 oscillator coil in the oscillator. Turn on the set and adjust detector and oscillator tuning condensers for maximum volume, with the volume control turned up about half way. Now take the fiber screw driver and adjust all three neutralizing condensers to maximum volume. Be sure the ¢.w. switch is off while doing this. If you find that you can hear a broadcast station all over the oscillator dial, readjust the neutralizing con- densers again after loosening them up about one full turn. When the i.f. stages are tuned to reso- nance, tune in some short wave broadcast station such as W2XE and make the final adjustment of r.{. tuning. Always remember that when you change the i.f. condensers you throw off the dial settings on tke oscillator tuning condenser be- cause you change the intermediate frequency. There is not much more to say about this set. As to results, it will operate a loudspeaker on any short wave ‘phone station being heard in this country and I am sure that anyone who builds this type of super will never be sorry for the time and money spent. I have been a radio amateur and set builder for 15 years and have used all kinds of sets but have never had one that would duplicate the performance of the Bandbox Superhet. Say You Saw It in QST — It Identifies You and Helps QST

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rigs en on The Mlost Umuazing Radio Value Ever Offered A NEW Screen Grid, Neutrodyne Circuit, Power Speaker A.C Hlectric, Ab A 2828 The eagerness with which low Utility Console Model at an Unheard of Low Price !!! the public has accepted the new CrosLtey Buppy and other models radio. Others find it an economical way of the ‘‘Companionship”’ Series is conclusive to provide several sets for radio reception proof that low utility cabinet sets are in different rooms of the home. Get wanted! The reception accorded the Buppy shows that there is an immense market for a low priced, reliable, Screen Grid, Neutrodyne, power speaker, A. C. electric receiving set. Many who could not afford higher priced sets welcome the Buppy as a reliable means of enjoying ship”’ Series. As an End Table the Buppy serves as a convenient resting place for books, maga- zines, ash tray, etc. The BUDDY SDD: This handsome Buppy model has a metal case with panels in beautiful burl walnut finish. Thetrim is silver and ebony in- lay effect. The legs as shown are standard equipment. Animproved Cros.tey Dyna- cone power speaker is included at the price, and is installed under the cabinet. Uses six tubes, two Screen Grid No. -24, one No. -27 as a bias-type power detector feeding into two No. -71As con- nected per. and a No. -80 rectifier i As a Bedside Table the Buppr provides ample space for night light, a book or two, telephone. etc, tube. as built-in power supply unit incorporating genuine trouble-free Mershon New condenser. Low Only 2414," high, 1734" long, 1144" deep Price In the Dining Room Western Price Slightly Higher the Buppr provides entertainment and . . o counted ‘Lhe Crosley Radio Corporation ae ae POWEL CROSLEY, JR., President CINCINNATI, OHIO Home of WLW—“the Nation’s Station” YOU'RE THERE WITH A CROSLEY in touch with your Crosley distributor today. Get your share of the profit- able business created by the amazing Buppy model and its associate models in the new Crosley ‘Companion- As Occasional Table the Buppyr will become a real companion pro- viding space for nut bowl, candy dish, ete. Ul In the Library the Buppry will enhance the enjoyment of any book by providing smoking materials at finger tips. o n — fr; In the Kitchen the Buppr brings in cooking and baking lectures and provides a place for note book in which to jot down recipes. -E€ROSLEY RADtTO Say You Saw It in QST — It Identifies You and Helps QST

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ALUMINUM SHIELDS BEAt TIPUL SILVER DIP FINISH Genuine ALCOA Stock $1.89 14 x 6 x 6, $3.95 Any size to order in 24 hours. ALUMINUM COIL SHIELDS 3% x 6% straight, 49c 60 3x 4%, 55c nd blast or polish, 20c extra \LUMINUM TUBE SHIELDS , 48c ) rT EADS Genuine RADION sleeves over No. 18 rk gs on other end. 20” long 69%c pair, 36” the thing for meters and other uses. for binding posts on metal, 15 for 10c. 12c r .01 or .015, 34c. r shaft extension, 33c. l-off in sulators, 4 colors, 17c. “lel “N"’, 29c. liagrams, 8% x 11 loose leaf perforated, Please include postage \N, THE RADIO MAN, INC. New York City Roy ande Street QUAR FZ OSCILLATING CRYSTALS s. (within 4 af 1°/o af your specifi at the following prices: ——— . .$12.50 100-20 eters 10.00 200-6 POT Pee eee . 15.00 1 in i blanks, 200-400, 400-600 meters..... 5.00 Dustpr f Bakelite mounts 3.00 e slibration furnished with each crystal) any practic able dimensions made to order jing to exact frequencies given on request) eters i mee R. S« . urs’ crystallographic experience” 4 pic neer erwatal grinder ’’ ii 3 N AVY SURPLUS sar yall-bearing generators with exciters. $7.50 om « ransformers, ‘easily tapped for any $7.50 Ge 1/750 150-watt dynamotors. 27. G 1/1500-volt 350-watt dynamotors. . $37.50 external drive $3.00 additional HEN! KIENZLE, 501 E. 84th Street, New York tributor of Government Surplus Scier ed for Maximum Power and Unconditionally Guaranteed frequency), . 4 Calumet Bidg., Buffalo, New York LEARN RADIO Dormitory — Laboratory Workshop SUBJECTS TAUGHT Vitaphone — Movietone Enroll now for Fall Term beginning September 29th Write for further information COMMERCIAL RADIO INSTITUTE 38 W. BIDDLE ST. "“io20"" BALTIMORE, MD. ha in a school with a reputation for graduating competent men Commercial Radio Radio Service Radio Broadcast Navigation Radio Mathematics boratory | | Angus Elected Central Division Director N a special election just held, the Central Di- vision has chosen Mr. D. J. Angus, W9CYQ of Indianapolis, as its Director for the unex- pired remainder of the term of the late Mr. Clyde E. Darr. The term ends January 1, 1931. Voting was as follows: Angus, D. J.... 876 votes Prazak, R. T..... eee iis Sellers, R. C...... eats 66 et ee . 23 “ Stark, C.S .... ~_ * Wise, Dallas... . 166 “ Mr. Angus’ amateur experience extends back some fifteen years, well before the war. He is our Section Communications Manager for Indiana, past President of the Indianapolis Engineers Club, a Lieutenant-Commander in the U. S. Naval Reserve, and a member of the A. I. E. E. A business man of mature years, he is treasurer and chief engineer of the Esterline-Angus Co,, in which capacity he has done much traveling that has brought him in contact with amateurs and clubs around his division. The Central Di- vision is to be congratulated upon its choice. W3CJ finds that his spare receiver coils are handy for shifting dead spots on his tuner. The coils are wound on tube bases, and an extra socket is connected in the antenna lead so that when a spare coil is plugged in it, it acts as a loading coil, thus shifting the resonance point of the antenna. W9CBK has a tuning condenser with plug-in rotor plates, while WSDXG puts the stator plates on plugs. The only thing we lack is a coil with plug-in turns or a tube with a plug-in filament. From the March issue of Factory and Industrial Management: ‘‘An editor must have his mail. So when ours failed to put in an appearance the other morning, we were moved to find out why. We found out. Bill, the office boy, had over- slept. Bill, we learned, is not only a radio fan, but a licensed operator as well, who sits up all night, most nights, accommodating the world with messages from Byrd and all that sort of thing. Has forgotten more about radio than most of us will ever know. There are lots of boys like Bill scattered around industrial plants these days Radio owes them plenty. Are we going to stand idly by while the big fellows do their darnedest to crowd these young explorers off the air?”’ Good-will of this sort is worth having. Nearly every amateur can do something to help build it. WIALJ thinks he should be awarded some sort of medal. He didn’t drop a single nut or screw when building his new receiver! 84 Say You Saw It in QST — It Identifies You and Helps QST 42°70 we sO SF teed — boy

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Di- x= de 1g The Most Fascinating Radio Book of the Year! Step ed sik’ ANI WAL 7 ra Coneptied by ihe ae honcat Scagf of got FREE ve EW RADIO NEWS jp —— This Big Illustrated Volume Containing All You Want to Know About SHORT WAVES ® want all the latest facts and developments on Short Wave receiving and transmitting, the Technical Staff of RADIO NEWS in collaboration with the foremost S-W authorities have especially prepared a complete, new, up-to-the-minute SHORT WAVE MANUAL for you. Replete with illustrations, diagrams, charts and plans — crowded with chapters by Lieut. Wen- strom, Hertzberg, Marshall, Spangenberg, Benne- weg and other experts — this volume represents the last word in authentic Short Wave data. You'll be fascinated with such features as: — B wane ait you and thousands of other radio men Breaking into Amateur Transmitting S-W Transmitter for the Average Home and Purse A Portable S-W Transmitter and Multi-wave Receiver The A. C. Operated Super-Wasp Crystal-Controlled 200 Watt S-W Transmitter The Egert S-W Four Experiments on Ultra-High Frequencies S-W Stations of the World For Real Thrills Get Down in the Amateur Wave Bands In short here’s the book that describes, illustrates and explains everything about S-W’s — that gives you the complete and latest data. And it’s yours WITHOUT COST! Why It’s FREE! RADIO NEWS has practically twice as many read- ers as any other radio magazine. But there are still a few of you radio men who don’t realize what you are missing. Send for Yours TODAY FRE Do you know that, besides covering every other phase of Radio, RADIO NEWS publishes many exclusive S-W features every month. Every issue keeps you posted on the latest S-W receiving cir- cuits, up-to-the-minute S-W Broadcast Call Lists, S-W Receiver and Transmitter Designs, News from the Amateurs, latest improvements in Portables, etc., etc. You absolutely need RADIO NEWS to keep abreast of all S-W developments. Big Cash Saving — Gift FREE! That’s why, although we will sell thousands of these SHORT WAVE MANUALS for a substantial price, for a limited time you may have a copy ENTIRELY FREE as an inducement to try RADIO NEWS. To introduce RADIO NEWS to you, we will send you the next Eleven Big Numbers almost a full year subscription for only $2 — and will ship you the new 1930 SHORT WAVE MANUAL, postpaid, entirely FREE! You save 75c on the newsstand price of RADIO NEWS and get this invaluable S-W volume WITHOUT COST! Risk nothing. Mail coupon TODAY! ee The NEW RADIO NEWS, Dept. 312, 381 Fourth Avenue, New York, N. Y. Gentlemen: Send me, ENTIRELY FREE, post- paid, the new 1930 SHORT WAVE MANUAL, and enter my subscription for the next Eleven Big Issues of RADIO NEWS at only $2 which I enclose (regular newsstand price $2.75). I understand you will cheer- fully refund me $2 and I may keep the S-W MANUAL if I am not more than satisfied. Name Address City and State......... Are you a Serviceman oO? Experimenter 0)? Engineer 0? Dealer 0? rrr) tt ttt ttt Say You Saw It in QST — It Identifies You and Helps QST 85

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You Can’t Duplicate Guesses s An audibility gauge for the ama- A udi meter teur. Do you always give the same on two audio? What about during a noisy panel-mounting Audimeter gives the right e same one on two A.F. as on one tube, during N, and will repeat itself. You can’t duplicate during tests if decently accurate reports It not only ends the guessing but it makes because the price is too low to justify any- atisfied with a guess. Calibrated with 5 arbi- nd with the half-points marked. Has a hand- lial, is single-hole mount and a pointer-knob ms. Serves also as volume control. Get the sser is going out of date in amateur or order. Price $2.80 to the amateur. The Hvy-7 L. W. Hatry’s latest double-detection de- A sign A six-tube receiver with three screen- I plete story on how to make it and why i scriptive circular. Band spreading if you hort-wave set. The aq High-resistance (1000 ohms per volt) Ve yI tma voltmeter and any milliammeter range bined. Low price. 1500v. and 500 ma. com- Name combination and get quotation or tion. The n, Cardwell, Electrad, Sangamo, Tobe, Yaxley, National, Frost, Pilot, Signal, i, Clarostat, etc., at amateur prices. And answer questions. Hatry * young Phone §-27535 ee eee) A. BBD Anam Jt. =, HARTFORD-CONNECTICUT-U.S THERES THE OnEAT Rect FreER ON weT xo-DAN: & rea. UHhE C bo NM THE TONAL. “MM AKES tT TaN 0 2 G. tee It with Recto Bulbs e R3 $10.00 Type R81 $7.00 NATIONAL RADIO TUBE CO. 3420-18TH ST. S.F. Sav Dealers CHICAGO LEEDS, N. Y. IENRY'S RADIO SHOP, BUTLER, MO. Say You Saw It in QST — It Doings at Headquarters OME changes have been made in the per- S sonnel at headquarters since the last ‘‘ Do- ings” were published. Included is the arrival of Mr. Clinton B. DeSoto, W9KL, from Middleton, Wisconsin, who has hooked up with us in the capacity of Assistant to the Secretary, which title Mr. A. L. Budlong relinquishes to become Assistant Secretary. Mrs. Winston Abbott, née Dorothy Menk, none other than DEM of Communications Department fame, has a permanent schedule now. The wedding was held April 12th with FEH and EV among those present. W15SZ has changed location again. The station is located now in the State Armory at Hartford. Nearly every member of the Hq. Staff dropped in at the New England Division Convention in | late April at Worcester, Mass., at one time or another. The week before the convention Fred Schnell, former Traffic Manager, was the guest | of K. B. Warner. “FS” had his golf outfit in tow. Nuff sed! D. H. Houghton, QS7’s Circulation Manager, has left for a three weeks’ business tour of the east, and middle west, checking up on QST dis- tribution. Ralph Beaudin is holding down the department in Dave's absence. F. E. Handy is attending the Midwest Division Convention. How the mighty have fallen! We cannot keep the news any longer. James Joseph Lamb, Technical Editor of QS7T, was married on May 5th to Miss Josephine Gleason in Hartford. The couple left for the great open spaces following the wedding and Mr. Lamb is booked to turn up at the Midwest Division Convention. . Considerable interest is being shown at Hq. | in the coming 28-me. tests in June. —C.C. R. Silent Keys It is with deep regret that we record the passing of these amateurs: Ernest R. Hood, W1AOW. George G. Goode, Centerview, Mo., W9GBT. Charles 8. Taylor, Buffalo, N. Y., W8PJ. Carl E. Trube, Yonkers, N. Y., Ex-2BK. LeRoy A. Dey, Osborne, Kans., W9CNT. Cambridge, Mass., ‘Be Strays “Ks PAOOOOOOOQF is reported in a recent list of | calls heard. We’ll bet that station doesn’t sign very often! Or maybe the reporter’s typewriter stuttered. Identifies You and Helps QST

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FRGROR ERROR re OL Pages missing here were advertisements and have been removed so that the volume will not é, be too bulky. OE OO ED LE ONL NE ONE NE WL NL WL WL Ne)

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Page 105

Ntw RE GULATIONS BY INSTALLING THORQARSON EQUIPMENT GOSH-MAN- THATS EASY-~ ALL You HAVE To Bo '3 To INSTALL THORDARSON EQUIPMENT— An’ Xou’Lil BE SIMIAN’ PRETTY— WITHA Pure B.c. 1930 SIGNAL- SEND IN YOUR ORDER To-DAN- So “ou CAN GE ON THE AIR- SAY- OLD MAN- How | In THE SAM HILLS CAN I Live uP To THE new AMATEUR REGULATIONS~ Just Loot aT tHE Dose ABOUT THES Se ea In - le ; . ay Ss S00 w. HURON ST. coz. KINGSBURY ST. CI | GX0IEGRGO@, Biabk. ammo h GUARANTEED MERCHANDISE AT SENSATIONAL PRICES MONEY RETURNED IF NOT SATISFIED PARCON FILTER CONDENSERS at 65% off list price. Brand new! Transmitting Filter Condensers: 1000 Volt DC Working (Con- tinuous): 1 Mfd. — $1.90. 2 Mfd. — $2.10. 4 Mfd. — $3.65. 6 Mfd. — $4.85. 8 Mfd. — $6.95. 2000 Volt DC Working: 1 Mfd. — $3.80. $5.90. PARCON Mica plate and grid blocking condensers 001, or .0005 Mfd. 750 DC Working. — $1.00. 1500 Volt — Special .002 Mfd., 2250 Volt 41.73 RCA-Stromberg Carlson 4 Mfd., 650 Volt DC Working metal- ee filter condensers. — $2.05. 7 . — $2.60. 2 Mfd., 450 Volt — $.75. High-grade unmounted 2 850 Volt DC Working filter condensers. Mfg's type. A quantity of these units may be series-paralleled for any desired capacity and voltage. SPECIAL — $.70 each. Four for $2.50 Eight for $4.65. Twelve for $6.45. Twenty for $10.00 U. S. Tool 11 plate SLF variable condensers. Easily cut down, Low loss. — $1.00. Two tor FRE SHM AN POWER TRANSFORMERS. A neat job in a compound-filled case. Fine for Transmitter, Amplifier, or Eliminator Gives 375 volts and two 7 4% volt center-tapped. 125 Watt. 7% Ibs $2.10. Two will give 750 volts and four 7% volts. All center tapped. SPECIAL Two for $3.95. SPECIAL RCA POWER TRANS- FORMER. Designed for use with UV-876 in primary to kee P voltage steady (A resistor may be used in place of the tube.) Gives 74%, 7% and 1100 Volts. All center-tapped. 175 Watts. 11 Ibs. Priced to sell fast — $5.95. Metal cased Filament Transformers. Well constructed 75 Watt. 2% and 2% Volts — $2.95. 7 4% Volts — $2.80. 7% Center tapped — $3.7: 7 CT and 7% — $4.25 7% CT and 7% CT- $4.95. 10 Volt — $3.25. 10 CT $3.75. Power Pack transformer 100 Watt. Gives 1% and 2 % Volts and 5, 5, and 650 Volts center tapped — $3.10. Unmounted 7 Volt, 50 watt Filament transformers Easily rewound for any filament voltage $1.50. Two for $2.60 RCA Audio transformers — $1.35. Output transformers $1.35. Guaranteed TUBES! Unconditional 60-Day Replacement. A Guarantee that really means something. UX-210 — $3.95. UX-281 — $3.25. UX-280 — $1.55. Good Tubes. fe sted before shipping (No free eeparemens.) UX-210 — $2.10. UX-281 — $1.50. Other types in lis ‘Mi ADE POWER CHOKES. 30 Henry, 175 Milliampere - “2000 Milliampe re, 6 Ohm Key tht imp filter cholse — $2.95. , 120 MA — $1.75. 2% Amp. “A” Chokes — $1.6 ‘A Wire-wound, Vitreous Enameled 5000 ohm. 30. W att Grid- leaks. With mounting rod. SPECIAL — 48c. We ship COD if you wish. All prices FOB New York QUICK SERVICE!! SEND FOR “SPECIALS” HARRISON RADIO CO. 35 Ft. Washington Ave. HAM-ADS (1) Advertising shall pertain to radio and shall be of nature of interest to radio amateurs or experimenters in their pursuit of the art. (2) No display of any character will be accepted, nor can any special typographical arrangement, such as all or part capital letters be used which would tend to make one adver- tisement stand out from the others. (3) The Ham-Ad rate is 15c per word, except as noted in paragraph (6) below. (4) Remittance in full must accompany copy . No cash or contract discount or agency commission will allowed. (5) Closing date for Ham-Ads is the 25th of the second month preceding publication date. (6) A special rate of 7c per word will apply to advertising which, in our judgment, is obviously non-commercial in nature and is placed and signed by a member of the Ameri- can Radio Relay League. Thus, advertising of bona fide surplus equipment owned, used and for sale by an individual or apparatus offered for exchange or advertising inquiring for special equipment, if by a member of the American Radio Relay League takes the 7c rate. An attempt to deal in . paratus in quantity for profit, even if by an individual commercial and takes the 15c rate. Provisions of peregraphe (1), (2), (4) and (5) apply to all advertising in this column regardless of which rate may apply. New York City PLATE power for your set, the very heart of its performance. For quietness, DX ability, life-long permanence, absolute de- pendability, lowest ultimate cost, no other plate source even approaches the achievement of an Edison steel alkaline storage B battery. Built painstakingly; every joint pure nickel, upset electrically welded. Genuine Edison Electrolyte. Our list de- scribes complete batteries, construction parts, enameled aerial wire, silicon steel. Available immediately, filament and plate transformers for the new 872 rectifier, complete plate power units. Rectifier Engineering Service, radio WS8SML, 4837 Rock- wocd Road, Cleveland, Ohio. SPECIAL rectifier aluminum, $1.25. Lead, $1.00 square foot. Elements 1 x 4 15 cents, 1 x 6 17 cents pair. All prepaid. Best silicon transformer steel cut to order, 25-35 cents pound. Post- age extra. George Schulz, Calumet, Mich. Say You Saw It in QST — It Identifies You and Helps QST 91

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FOR sal et 0-306 ampere H. Sr roi, Pa. CRYS Write SELI te parts ‘Tex 7 SE LI $12 FOR Par dars sa" n 1 x 4Nqu, 2 able, $ 65 F.O delp ss t SI Q i ot mitte tia friend PI Barit TY! Mer and Wi lition, r $4.80. R watt 650-0-650, 74, , ” = hanged to W2ZC. nds (new tle an estate, Weston model 433 a.c. voltmeter 22.50. Roller Smith type _GSD-d.c. in wooden case, new condition, $17. George

prices on real high quality crystals. weat

station, from fones to monitor, all standard n request. W5AQJ, Box 228, Weatherford,

E. 211E fifty-wid socket, used eight hours,

s wo rh i-famous 50-watt transmitter must go. uding 203—A tube and tube rectifier. Thor- It umatevenee. Complete, ready to operate, guaranteed to go to first Ham sending Silver Marshall round the world four es and Willard “A" power, $40. No trades. ( harleroi, Pa. R.E.L. transmitting coils, $3.85 ye .00025 new Cardwell transmitting svemeter monitor or what offered. All replies res, W9OGAS, Ord, Nebr. 851, UV204A. State condition, price. mercury are rectifier, $25. Fred Manion, 220 de! phia, Pa.

tw new Liso <

Co wholesale Rice St motor generator sets, , Chicago, Ill. volt és. drive, output 1000 volts d.c., { et 45" eight other Esco types. olt P mg ” $8. Used, $5. Send for list. R, i St , Corona, N. Y. ctifiers (Westinghouse), 2 amperes; only “ali ve, also for chargers and A eliminators. rs, 6 inches overall, large plate, $3.53; type ested in transmitter. New and guaranteed. vders, Pyrex glass, 15 cents. W9DWA 5508

lity merchandise. Everything new and satisfaction. C.O.D. orders accepted. Colum- ndensers: Working Voltage — 1000 d.c., 1 $2 30: 4 mfd., $3.80; 8 mfd., $6.45; 2000 1 mfd., $3.95; 2 mfd., $6.05. Power filter 200 m.a., $2.50. 30 Henries, 125 m.a., ‘UX281s, $2.25; UX210s, $2.95; UX280s, unted filter condensers,—850 V_ d.c. each, 80c, four for $2.60, six for $3.75, eight r $6.60. 1 mfd., four for $1.35, eight for C.A. Power Rheostats, heavy duty, Send for list. Columbia Specialty Co., 1038 ¥.G

t screen-grid power tubes for sale at a reason- Ewing, Jr., 29 S. LaSalle St., Chicago, Ill. rdarson R210 compacts, $5.25, postage ransmitters, receivers, power supplies and ulletin av ailable. Pontiac Engineering Co., okiyn, ‘tors for television \% h.p. am 110

1800 , $16. f.0.b. W2JI1, Secaucus, N.

$10; 1750 kilo. ale or 7 3500 kilocycle, W9DLL, 222 your specified frequency. Kansas City, Mo. 110 volt,

60 cycle. Mounted and 7%, $7. 550-0-550, 744, 714, $4.50. 250 watt 550, 750 each side, 744, watt 1000, 1500 each side, $14.50. Filament volt a center tapped 75 watt, 744, 12 -volt, $3. 234, 234, $3.50. 150 watt, 10 7% , $3.00. 350-0-350, 5, 24, 2, $4.50. le § ce $1.75. 30H 100 m.a. double "choke, ngle adjustable, $4.50. 30H 250 m.a. adjust- working voltage 600 unmounted condensers, ks, 450 volt, 2-4-4-1-1, $3.65. Prices are net Laboratories, 834 N. Randolph St., Phila- specials.

00 per hundred. W9BEU, 9032 Windom,

1000-watt xtal beam trans- tic radiogramme schedules. Will my old please look for me under W2ZC? Harold I ittle Silver, N. J. tubes). All characteristics normal. .5V. filament. Guaranteed perfect operation $5.00 each. E. Ewing, Jr., 29 S. LaSalle St.,

from a crystal holder to a broadcast station. 1d Road, Montclair, N. Listen in on announcements from W3XK, E.S.T., or send for descriptive literature.

ries, 1519 Connecticut Ave., Washington, D.C. $5.25; Power Xtals, Super-Wasp, d.c., $29. 40; a.c., $34.40; Flechtheim, 2 mfd., 2000 wkg V. conds., $8.7 5; Tobe, $11. 70; Jewell meters volt or m.a. $5.50; r.f., $9,90; set analyzer, $72; Leach relays, $9 and $6. 75: Sangamo .002 5000 V. conds., $1.40; R.E.L. sockets, 50 watt, RECTOBULBS, R3, $10; R81, $12; $1.50; 204-A, $4; Alcoa, 99.69 i, aluminum, 70c sq. ft.;W.E. and R.C.A. tubes; tubes repaired. Any other apparatus. Henry's Radio Shop, W9ARA, Butler, Mo. G.E.1000-watt transformers, 1100-—2200-4400 each side center tap. Used by Cornell, Navy, and 300 hams. Guaranteed uncon- ditionally, $12. F.O.B. Detroit, Fred G. Dawson, 5740 Wood- row, Detroit, Mich. Some 590 watters, no center tap (bridge cir- cuit) $5.00. $10; WHILE they last — piezo quartz plates, 3500 kc., 7000 ke., $20. Dr. Gerald W. Fox, 419 W. State, Ann Arbor, Mich. SELL DeForest long wave “Cornet,’’ S-W_ (complete), Browning-Drake, X210 new, $2.85. Sleeal key, bunch parts,

write L. R. Mitchell, 1106 Kenneth Drive, Lakewood, Ohio. SELL — W9AGX, Racine, Wisconsin complete. Write for details. CRYSTALS — unconditionally guaranteed 1750 ke., $7.5 3500 ke., $10; 7000 ke., $15. C _ al holders, $3.50. W: 2BU Ww 81 Parkway Road, Bronxville, N. Y. SELL or trade: R.C.A. 203-A, 211, 845, 852, 860, 204-A; W.E. 211D, 212D; power Xtals; 210 Xmitter; yaad 500-V, MG; other apparatus. W9ARA, ann Mo. QUITTING business — 750-V. 44 amp. W.E. motor-genera- tor, t.p.t.g. trans. 3 tube Aero coil receiver, $25. Miscellaneous radio parts. Everything in excellent condition. Almost new. Write me. L. Lorber, 801 Colver St., Muscatine, Iowa. FLECHTHEIM 1500-volt condensers, porcelain insulators, 2 mfd., $4.50; 4 mfd., $7, used. Mershon condensers, $1.75. New National 3000-volt .00045 with vernier dial, $9.50; .00023- 6000 volt, $12.85. Jefferson 300-volt center-tapped trans- formers, $1.65. Pilot D. C. Super Wasp kit, $28.90, with a pair of Timmons ‘phones free. Pilot A. C. Super —. kit with cone speaker and power pack, $50. Newest type Rectobulbs R3 mercury vapor, $10 prepaid. 281 type mercury vapor, $7 prepaid. Allen Bradley radiostat, new type 500 watt, $5.50. Aero Monitors, $10.85. R.E.L. Wavemeters, $16. Pilot and Silver Marshall coil forms, $.39. Wire-wound 5000-ohm grid leak s, $.39. Freshman 375-volt, not center-tapped, and two 7% center- tapped filament windings, $2.25. Signal High Fre- quency buzzer, $.95. New Cardwell

.00035 SLF condensers, $.79. No. 14 cotton covered enameled aerial wire, $.90 hundred feet. No. 12 solid enameled aerial wire, $.95 hundred feet; $1.80 two hundred feet coils. R.E.L. 50-watt sockets, $1.50. Used Kellogg double-button mic rophones, $35. Sangamo "5000- volt .00025, .0005, .001, .002 mica condensers, $1.50. Thor- darson key click filter chokes, 1% Henry, 200 mill, $2.95. Thor- darson modulation eransfermara, $2.95. Latest Amateur Call books, $.85. Used Western Electric 212D 250-watters, $35. R.E.L. sockets for same, $9. New UX 852, $28. Slightly used R.C.A. 211, $17. Slightly ‘used 204As, $50. R.C.A. UV 217As, $7.50 each. UX 866s, $11.85; New UX 851 1000-watter, $250. Western Electric 211A, D, or E 50-watters, $15, slightly used. New 211Ds, $20. Jefferson, 30 Henry chokes, 100 mills, $3.25. Thordarson twin chokes, 20 Henry, 250 mills, each $6.25 2500-volt lamp 133 segment Spaulding generator, directly coupled to G.E. | ang yt we pd motor, cost $650, special $225. Here's a real buy. Limited quantity new original cartons Gold Seal UY 227 tubes, $.89 each; UX 245, $1.15; UX 280, $1.05; R.C.A. High Mu UX 240, $1.00; R.C.A. Voltage Regulator U X 874, $3.25. Broadcast microphone cases. $2.2 hordarson 400-volt each side center, 150 watt, $3.90. Signal a 3 16” 4 Mew. contact keys at $.95. One thousand ohm relays, $1. Chemically pure aluminum, $.70 sq. ft. Also aluminum a. and corner strips for any size cabinet. Write for prices and free Ham sheet. 19 Strand enamel silk-cov ered Litxendacht wire one cent a ft. New Signal bugs, $12 net. Moving to larger quarters. Visit our radio shack when in town. Good time assured. What have you for sale or trade? We carry everything for the Ham. More foreign trade "A 24-hour service. Uncle Dave, 117 N. Pearl St., Albany, N. Y. CRYSTALS — Guaranteed excellent oscillators. aa inch square sections of your approximate specified frequency: 7000- ke. band, $15; 3500 ke., $10; 1715 ke., $8; Guaranteed blanks, $4. Frequency precision, .1%. One-day service. Precision Piezo Supply, 427 Asia St., Baton Rouge, La. SELL — Westinghouse 27.5/350-volt S. Magid, 275 Corbin Place, Brooklyn, N

, ee $12.50

SELL —one Westinghouse dynamotor, 27. 5, '350-volt, new, never used, $9. Roy Philhower, Long Vailey, N.J WHY buy cheaply made tubes when you can get a —— of the General Electric Co. for only $1.25. Genuine G. —_ CG1162 Navy Five-watters will stand up to 750 volts a P and 7.5 on filament. Ideal for either oscillators, modulators or or amplifiers. They are a bargain you don’t very often get. eon tubes for wavemeters, $.50 each. Our surprise package is going over big; values up to several dollars in one pac kage for only $1.00 each. Money back if not 100% satisfied. cial: 0-100 milliammeters, $1.50 each, 201A type tubes. $.50. A ] mer- chandise guaranteed. Sent C.O.D. or Pp. E. Hufnagel, 879 So. 18 Str., Newark, N. J. Say You Saw It in QST — It Identifies You and Helps QST

W 2F I QSLs Corwi WAN you? | 6000V 6000V 1-pha: 300W $10.5 Electr CON] 600, $ VIBR ceiver tradec TRA] writer W9G! SELL tube : mittir list. T W2C!l TRA! Consi conde Amar SELL ton, QSL Crane THE most Radi comp coils, signs, reque copy. Warr AMA 1.R.E count poun new exper mitti estab TEL salari Catal GUA Nass: CRY mode ature blank

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$12; 2000 n.a., 3.75; vatt, and ry’s nter con- ood- > clr- 7000 ate), arts. red net. wn. ry our nch ezo ial: \er- 879 DIRECT reading wavemeter type 174 adopted for receiving or transmitting sets, employed with either — or undamped waves, for use in commercial and experimental waves. New, less than one-half cost. H. T. Watson, 149 Mulberry St., Newark, N. J A.R.R.L. sweater emblems should be worn by all League mem- bers. They are yellow and black 5” x 8” diamond, felt letters and embroidered symbol. Only $1.00. Money order or currency only accepted. Ene Robinsion, 135 Jefferson Road, Webster Groves, Mo. NEW Hilet transmitter panel name plates, also chokes and transformers. See Hilet advertisement in this issue. Jewell No. 54, 0 to 2000V meters, $1000. ohms per volt, $14. M. Leitch, Park Drive, West Orange, N. J. TELEVISION Kit — 12-inch scanning disc; shaft and bearing frame; motor hub and driving disc; synchronizing screw; neon lamp and lamp holder $7.50, parcel post prepaid. Jenkins Lab- oratories, 1519 Connecticut Ave., Washington, D. C. WANTED — Vol. I of QST, bound or single copies. State con- dition and price. K. B. Warner, 1711 Park St., Hartford, Conn. TUBES — nationally known brand type 250, never used, 2.00 each. F. W. Wiebers, 600 Wisconsin Ave., Oak Park, Ill. FOR sale 50-watt xmitter. Al outfit. W2BMB. HAMS only — Elgin, Ill., etc. watches 25-35% off. Radio ap- a taken exchange. Fine watch repairing. W9EUU, Sibley, i] SELL d.c. super-wasp in cabinet, wired, $35. Junior Teleplex, $7.50. Want 80-meter fone. W6GDGN, Route 3, Tucson, Ariz FOR sale Used 387 Western Electric mike, $25. Changing to condenser mikes, WDGY, Minneapolis SELL — new wired Silver-Marshall round world four with extra coils, $28. New General Electric health vibrator with stand, $3. Peerless mounted cone, $4. 0-2.5 Jewell thermo- coupled ammeter, $5, 0-10 Jewell voltmeter (used), $3. R.C.A. Radiola, ‘20’, $11. Atwater-Kent “35”, $8. Western Electric “*25-B"’ power amplifier with cone speaker and tubes in perfect condition, $55. Excellent short-wave set, detector and two step with S-M audio transformers, $15. James McGill Boyer, WSALD, 6116 Howe St., Pittsburgh, Pa. 903A R.C.A. thoriated filament, 50-watt, brand new, in sealed boxes. No reasonable offer refused. Only seven on hand. Radio Engineers, 250 E. 57th St., N. Y. C. WANTED — parts for 250-watter. Tube, meters, condensers, rectifier, filter. What have you OM? Good condition? Price? Box 544, Hemet, Calif. $20 c.o.d. takes 150-25,000 meter Kennedy with 2-step. V. F. Jones, 815 Loma Ave., Long Beach, Calif. SELL Weston model 537 test box, good condition, $35. Also other used apparatus. Send for list. W. C. Holder, Valdosta, Ga. W4 Z. WSBNF — selling out. Will consider a reasonable offer on any apparatus. G. H. Snyder, Lewisburg, W. Va. SELL — Two UV2ll d’s, used less than six hours, $15 each Quartz crystal, one inch square, exact frequency 3525 KC., $12.50. Ten 5-watters, VT2’s, brand-new, $1.50 each. One W.E. 50-watter, brand new, $10. Prepaid on receipt of price W2FL GRAR. QsLs 100 two-color, Corwith, Iowa. ie WANTED — 500-cycle generator and transformer. What have you? Claude Mitchell, Ray, Ariz a 6000V., 12,000W., 3-phase drive motorgenerator, $1500. 3000V 6000W. 3-phase drive motorgenerator, $500. 2000V. 500W l-phase drive, $195. 1500V. 400W. 3-phase drive, $125. 1000V., 300W., $95. 1000V., 250W., $85. 44-Hp. 3450 R.P.M. motors, $10.50. Converters, 32V. d.c. to 110V. A.C., $35. Queen City Electric, 1734 Grand Ave. Chicago. CONDENSERS, 10 mfd. tested at 1000V., working voltage 600, $1.75 each prepaid. W9ARA, Butler, Mo. VIBROPLEXES, Teleplexes, Omnigraphs, transmitters, re- ceiver, wasps, 50-, 75-, 100-watters, S tubes. Bought, sold, traded. Ryan Radio Co., Hannibal, Mo. RADE $100 Holton Revelation Trumpet es Remington Type- writer for Motor Generator es Fone Xmtr parts. Write offer. W9GKG, Milledgeville, Ill. SELL, trade. Battery super-wasp, $25; Silver-Marshall four- tube assembled, $10; Radiophone transmitter, $25; Acme trans- mitting condensers, $4; transformers, motors, chokes. W rite for list. UV203As. Send me ur lists. Stephen Beck, Roosevelt, N. Y. W2CE $1.00. Stationery, samples. W9CKA, Q R A SECTION 50 c. straight with copy in following address form only: W2BJI — Hackensack Radio Association, Y. M. C. A. Building, Hackensack, N. J. W4ADY — R. L. Miller, Jr., 501 Park Ave., Wilson, N. C. W4HC — H. Dohlen, 3219 Pearl St., Jacksonville, Fla. W5BKW — Leo Havard, 7106 Hemlock St., Houston, Texas. W6IK — H. Y. Ballou, 478 Lewis St., Los Angeles, Calif. WSCOL — H. G. Noah, 1240 Beverly Place, Brookline, Pitts- burgh, Pa. W9APH — Harold A. Hughson, 508 Michigan Ave., Manis- tique, Mich. ei nae W9LQ — Leslie M. DeVoe, 3360 N. Meridan St., Apartment D4, Indianapolis, Ind. WIMK A.R.R.L. Headquarters R. B. Parmenter, Chief Op. “rp” The following calls and personal sines belong to mem- bers of the A.R.R.L. Headquarters gang: W1AKW-WIKP Clyde J. Houldson “ch.” WIBAW R. B. Beaudin. WIBDI-WI1XL F. E. Handy “fh.” WICEI J. J. Lamb “jim.” W1DF Geo. Grammer “‘hg.”’ WIEH K. B. Warner “kb.” WIES A. A. Hebert “ah.” W1FL-W2JR G. Donald Meserve “dm.” W1SZ-WI1BIZ C. C. Rodimon “rod.”’ WIUE E. L. Battey “ev.”’ W9KH Clinton B. DeSoto “de.” TRADE — Three eighty-meter plates and five tested blanks. Consider power-filament transformer for 280 rectifier, meters, condensers, transformers, tubes, etc. Jack Frost, Box 3271, Amarillo, Texas. SELL 500 QSTs, 8S. & 1., R.N.s. Schindler 116 Rebecca, Scran- ton, Pa QSL cards, message blanks, wall cards, stationery. Selden’s, Cranesville, Pa. THE finest in radio for amateur, broadcast and marine. The most modern short-wave receivers. Four to ten tube designs. Radiophone CW transmitters of any power or type. We make a complete line of apparatus, including speech amplifiers, filter coils, inductances, power units, etc. Any special apparatus, de- signs, built to order, using your parts if desired. Prices on request. New bulletin lists complete line of apparatus. Write for copy. Ensall Radio Laboratory, 1527 Grandview &t., 8. E Warren, Ohio. AMATEURS — experimenters, builders. We serve over 4000 1.R.E., A.R.R.L., ete., experimenters and “‘nuts.”” Full dis- counts. $50,000 stock approvéd parts — no sets. Over four pounds catalog, circuits, data, prepaid, 50c. Weekly bulletins new items, results of experiments, etc.), 20 weeks $1.00. Sample experimenters ‘‘ Over the Soldering Iron"’ magazine, 25c. Trans- mitting data, price list, ete., 25c. Kladag Radio Laboratories, established 1920, Kent, Ohio TELEGRAPHY — Learn Morse and wireless telegraphy. Big salaries. Tremendous demand. Expenses low, can earn part. Catalog free. Dodge’s Institute, Wood St., Valparaiso, Ind. GUARANTEED 281s, $2.50. Filter chokes, 75c and up. Nassau Radio, Seaford, N. Y. CRYSTALS carefully ground for highest output demanded by modern transmitters. Frequency precision. 1% at room temper- atures. 7000 ke., $15; 3500 ke., $12; 1750 ke., $9; guaranteed blanks, $4. W9DRD, Herbert Hollister, Edwardsville, Kans. Say You Saw It in QST — It Identifies You and Helps QST SUPER-DAVOHM RESISTORS preferred and specified by ex- perts the world over, for.... laboratory standard high voltage regulators vacuum tube plate resistors vacuum tube grid resistors voltmeter multipliers telephone equipment television amplifiers fading controls isolation resistances Catalogue sent on request If your dealer cannot supply you—vwrite us THE DAVEN COMPANY 158 Summit Street, Newark, N. J. Resistor Specialists ‘‘Standards of Efficiency’’ 5 to 5 million ohms; guaranteed 1° tolerance

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To Our Readers who are not A.R.R.L. members LDN’T you like to become a mber of the American Radio Relay We need you in this big organization mateurs, the only amateur associa- loes things. From your reading of u have gained a knowledge of the League and what it does, and read its purposes as set forth on this issue. We should like to have me a full-fledged member and add vgth to ours in the things we are king for Amateur Radio. You will membership edition of QST delivered joor each month. A convenient appli- rm is printed below — clip it out and day. ide interest in amateur radio is the *ntial qualification for membership 4N Rapio ReLtay LEAGUE 1, Conn., U.S. A. by apply for membership in the Radio Relay League, and enclose $3 in foreign countries) in payment of dues, $1.25 of which is for a subscrip- ST for the same period. Please begin cription with the issue. Certificate of Membership and send » the following name and address. 1 know a friend who is also interested in ur Radio, whose name you might give ve may send him a sample copy of QST?

L

For Your Convenience QST’S INDEX OF ADVERTISERS IN THIS ISSUE Acme Apparatus Company ... ovateeaeine Mae Allen-Bradley Company cass shae ae American Pieso Supply Co ; ea American Sales Company : . Amrad Corporation . 77 Arcturus Radio Tube Co. . = Auriema, Inc., Ad. . . . 6&8 A.R.R.L. Apparatus. . 88 A.R.R.L. Application Blank. 94 A.R.R.L. Book Dept.. . ‘ 9 A.R.R.L. Emblem... . A.R.R.L. Handbook . . 72, 76, Cover il Blan, The Radio Man 84 Burgess Battery Co. Cover 1V Candler System Company 64 Cardwell Mfg. Corp., Allen D 53 Ceco Mfg. Company - & Central Radio Labs. 5 Commercial Radio Institute 84 Cornell Elec. Mfg. Co. 80 Corning Glass Works — Crosley Radio Corp. ; 83 Cunningham, Inc., E. T.. ede Sn Daven Company ine . DeForest Radio Co. ‘ 1 Deutsc _— ann Company, Tobe eee 88 DOE, G. B. vsccccceveses ‘ ee er 74 Electrad, Inc. . _— st 82 Electric Spe cialty Co - -- 9 Wrest, Ems... Berbers BE. ow. ccc ccc ssccccccccccsess 80 Gene r - Radio Company 2 Grebe 82 Gulf Rs adio School 82 Hall's 72 Hardwick, Hindle, Inc. 72 Harrison Radio Company 91 Hatry & Young 86 Hilet Engineering Co 72 Hoodwin & Company, Chas 76 International Resistance Co................0-55065 65 Jenkins Television Corp sch eunedeneaeee Jewell Electrical Instrument Co peneosnces an ee, BOE Bs oo 6c bec ctcvesccsdevesestesncene 84 Reet RAGS OO. .cccccccccecccccecccsssoscscccese 71 Manhattan Electric Bargain House ............... 66, 67 Dees Car, D. eso cccsreserepecsses ‘ 5 Massachusetts Radio ‘& Tele graph School — . 80 McGraw-Hill Book Co ‘on <« 2 Munzig, Arthur L. _ ee sooo National Company ccocecsccccoe OO National Radio Tube Co cevcccce 86 i OO, 5 6g bbc tdeccessacndveceseeesanes 74 Perryman Electric C ompany ee ee POsteP COMRBOR . oo cc gece cece ccccccsccccccsesese 66 QST Binder .. . 2. c ccc c cece ccc nee cweencenceees 58 GET VERO H oc cccccccccccccccccccscccceces 78 Radio Engineering Laboratories ............... 64 Radio News 85 Radio & Television Institute 73 RCA-Victor Company 59 Rectifier Engineering Service 78 PRGGMGD,, DOMME Te cc ccccccccccccccccccccccvcsescce S4 Scientific Radio Service . : , ; . 89 Shallcross Company ‘ ‘ = Silver-Marshall, Inc. , ‘ a a Sprague Specialties Co. .. ; . . & Teleplex Company ; - S06eéeeonwe 7 Thordarson Elec. Mfg. Co. see sadeneesae ie Vibroplex Company .... 1... ccc cece ec ccccccccccece 78 Ward Leonard Electric Co. ..... 2.6... eee eee eeee 89 WE CAD gn cccnccenetecesescoscevesseseoes 56 Weston Electrical Instrument Corp. ................ 61 Wireless Egert Engineering ...... 2... 00. ceececeees 80

Say You Saw It in QST — It Identifies You and Helps QST

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yf VOLUME XIv JULY, 1930 NUMBER 7 Editorials Your Broadcast Receiver as a Shortwave Superhet Geo. Grammer A Compact and Inexpensive Chemical Rectifier George S. Parsons Annual Meeting of The A.R.R.L. Board K. B. Warner New Two-Volt Tubes Official Frequency System Progress New DeForest Tubes Naval Reserve Holds Its First National Emergency Drill Wm. Justice Lee Hamming With a Portable in Africa Clyde DeVinna Correction VE2CA New England Division Convention © Go Noon I-Ie ‘ Experimenters’ Section I.A.R.U. News Communications Department Calls Heard Correspondence Department rw Correction Silent Keys Charles S. Taylor Ham-ads and QRA’s QST’s Index of Advertisers QST is published monthly by The American Radio Relay League, Inc., at Hartford, Conn., U. S. A. Official Organ of the A.R.R.L. and the International Amateur Radio Union Kenneth B. Warner (Secretary, A.R.R.L.), Editor-in-Chief and Business Manager James J. Lamb George Grammer Clark C. Rodimon Technical Editor Assistant Technical Editor Managing Editor David H. Houghton G. Donald Meserve Circulation Manager Advertising Manager Advertising Offices. .... 55 West 42d Street, New York City Editorial Offices YE ee ; 1711 Park Street, Hartford Subscription rate in United States and Possessions, Canada, and all countries in the American Postal Union, $2.50 per year, postpaid. Single copies, 25 cents. Foreign countries not in American Postal Union, $3.00 per year, postpaid. Remittances should be by international postal or express money order or bank draft negotiable in the U. S. and for an equivalent amount in U.S. funds. Entered as second-class matter May 29, 1919, at the post office at Hartford, Connecticut, under the Act of March 3, 1879. Ac- ceptance for mailing at special rate of postage provided for in section 1103, Act of October 3, 1917, authorized September 9, 1922. Additional entry at Concord; N. H., authorized February 21, 1929, under the Act of February 28, 1925. Copyright 1930 by the American Radio Relay League, Inc. Title registered at United States Patent Office.

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SAFE ({UIDE in the selection of insulation for Radio Transmitting and Receiving Sets _-

’ > < wios SAY W nere and poritte ss a ng au pari perfor™ e

VER 300 broadcasting stations, leading radio telegraph systems, the United States Army, Navy, Air Mail, Coast Guard and Ice Patrol Serv- ices, explorers like Commander Byrd, and exacting amateurs everywhere have utilized PYREX Insulators in many spectacular achievements. Regardless of whether you are sending or receiving — on land, sea or airplane — you should be thoroughly familiar with the PYREX Antenna, Strain, Entering, Stand-off and Bus-bar Insulators that are helping these leaders to make radio history. The new PYREX Radio Insulator booklet lists all types and sizes with data that you will want for ready reference. Return the coupon for your copy, and if you want further advice on any insula- tion problem, our Technical Staff will answer your questions promptly.

Send the coupon for your copy Corninc Grass Works Corning, N. Y. Gentlemen: bulletin on Radio Insulators. Name | | I | | | | | | Address I l 1 1 . 1 OST 7-30 LD Pee Git Pre)

Say You Saw It in QST — It Identifies You and Helps QST

Please send me copy of your new

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new emer EDITORIALS SIGNIFICANT feature at the recent meeting of our Board of Directors was the very lively advance interest which had been shown by members in the important topics which were to come up for discussion. Helped somewhat by the prepara- tion of a list of topics some weeks in advance of the meeting, and by the usual call in QST urging members to communicate their views to their directors, the meeting had the advantage of an unusually complete expression of amateur opinion and desire. It is a sign of good health in an organization when its members actively interest themselves in its affairs and when, as this year, they so well unite in viewpoint and general sanity of comment. This was very well shown in the study of out-of-band operating. There was little question that when the Board met the directors would feel that the Government ought to be asked to undertake better enforcement of allocations, but what would the members think of such a course? The answer was clear, because the members of every division had expressed themselves in advance, voluntarily to their directors, and in emphatic lan- guage. That, we say, is a good sign. This lively interest was particularly evident in the ‘phone question. Many points of view had been expressed. There were, of course, some requests to widen the 3500-3550 ‘phone band, many to keep it as it is, some to shift it to the other end of that band; suggestions to make the use of oscillator-amplifier transmitters compulsory; and many suggestions concerning the desirability of increasing the qualifications required of the ‘phone operator. Experienced ‘phone men in particular joined in sponsoring this last suggestion. The Board's job in deciding upon a course that represented “‘the greatest good to the greatest number’ was a difficult one, but nothing like as difficult as it would have been without the very extensive expression of opinion which had been made by members everywhere. The Board's eventual decision, as reported elsewhere in this issue, was to seek no change in the size or location of the 3500-kc. ‘phone band, to frown upon any specifica- tions of apparatus, but to sponsor a new grade of operator's license to be required for all ‘phone operating, the basic requirements of which would be the possession of special technical qualifications and at least a year’s C.W. experience. ‘Phone transmission must be recognized as an advanced form of communication, the fundamental requirement for which is the possession of a very high-grade C.W. station. To operate it intelligently the amateur must first be a skilled and experienced C.W. operator. The ‘phone bands are badly congested today, but not with good ‘phones. The ‘phone amateurs consist of a small number who are well-versed technically and seriously interested in doing a good job in a very difficult field, and a large number of ‘‘punks’’ who make the night hideous with unintelligent efforts directed at inadequate equipment. The League's present plan for ‘phone thus proposes a big improvement for the legitimate ‘phone operators by the eventual removal of the poor ‘phones. The elimination of amateurs without the quali- fications or the enterprise to learn the code, and of C.W. amateurs who are just ‘‘messing around”’ temporarily with ‘phone, is the biggest favor that could be done the ‘phone man. The good ‘phone man deserves protection and the right to adequate operating facilities. The Board's action will clear the air for him, and the good ‘phone man will be well pleased with the change. K. B. W.

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AL UMINUM SHIELDS rIFUL SILVER DIP aaa Genuine ALCOA Stock 14 x 6 x 6, $3.95 4 hours SHIELDS order in 2 ALUMINUM Coll x 6% straight, 49c 3x 4%, 55¢ or polish, 20c extra \LUMINUM TUBE SHIELDS ( » 48 ) ne RADION sleeves over No. 18 n other end. 20” long 69c pair, 36” ing for meters and other uses 15 for binding posts on metal, 10c 15, 34e. t extension, 33c. i colors, 17c. N", 29c. ators, 8% x 11 loose leaf perforated, nclude postage RADIO MAN, INC. New York City THE 29 it Street Ol ARTZ OSCILLATING CRYSTALS r Maximum Power and Unconditionally Guaranteed tthin “© af 1°/o af your specified frequency’, »wing prices $12.50 10.00 15.00 5.00 3.00 200 c . tin blanks, 200-400, 400-600 meters. Du akelite mounts . libration furnished with each crystal) icable dimensions made to order exact frequencies given on request) 4 Calumet Bidg., Buffalo, New York re’ crystallographic experience”’ cor eryaial grinder "’ U. S. NAVY SURPLUS bearing 7.50 generators with exciters $7 ers, easily tapped for . $7.50 150-watt dynamotors 27.50 olt 350-watt dynamotors. . $37.50 rnal drive $3.00 additional 501 E. 84th Street, New York r of Government Surplu HE” NZLEI ‘LEARN RADIO — in a school with a reputation j ‘ for graduating competent men Dormitory — Laboratory Workshop SUBJECTS TAUGHT Radio Service Commercial Radio y Radio Broadcast Navigation r Radio Mathematics Laboratory Vitaphone — Movietone Enroll now for Fall Term beginning September 29th Write for further information COMMERCIAL RADIO INSTITUTE 38 W. BIDDLE ST. BALTIMORE, MD. ue aie’ Say You Saw It in QST — It | | Identifies You and Helps QST Angus Elected Central Division Director N a special election just "7 the Central Dj. vision has chosen Mr. D. J. Angus, WosCyQ of Indianapolis, as its ne for the unex. pired remainder of the term of the late Mr. Clyde KE. Darr. The term ends January 1, 1931. Voting was as follows: Angus, D. J... S76 votes Prazak, R. T.. ma Sellers, R. C. oe * Spiller, A ug = * ty . 119 - Wise, nadoath 166 = Mr. Angus’ amateur experience extends back some fifteen years, well before the war. He is our Section Communications Manager for Indiana, past President of the Indianapolis Engineers Club, a Lieutenant-Commander in the U. §, Naval Reserve, and a member of the A. I. E. E. A business man of mature years, he is treasurer and chief engineer of the Esterline-Angus Co, in which capacity he has done much traveling that has brought him in contact with amateurs and clubs around his division. The Central Di- vision is to be congratulated upon its choice. Se Strays “Ky W3CJ finds that his spare receiver coils are handy for shifting dead spots on his tuner. The coils are wound on tube bases, and an extra socket is connected in the antenna lead so that when a spare coil is plugged in it, it acts as a loading coil, thus shifting the resonance point of the antenna. W9CBK has a tuning condenser with plug-in rotor plates, while WSDXG puts the stator plates on plugs. The only thing we lack is a coil with plug-in turns or a tube with a plug-in filament. From the March issue of Factory and Industrial Management: ‘‘An editor must have his mail. So when ours failed to put in an appearance the other morning, we were moved to find out why. We found out. Bill, the office boy, had over- slept. Bill, we learned, is not only a radio fan, but a licensed operator as well, who sits up all night, most nights, accommodating the world with messages from Byrd and all that sort of thing. Has forgotten more about radio than most of us will ever know. There are lots of boys like Bill scattered around industrial plants these days. Radio owes them plenty. Are we going to stand idly by while the big fellows do their darnedest to crowd these young explorers off the air?”’ Good-will of this sort is worth having. Nearly every amateur can do something to help build it. W1ALJ thinks he should be awarded some sort of medal. He didn’t drop a single nut oF screw when building his new receiver! at

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1 Die CYQ inex- ‘lyde oting back iS our liana, neers 0. & E. E. surer Co, veling jteurs | Di- Ss are . The ocket when ading f the lug-in plates with nt. istrial mail. ve the why. over- n, but night, with t hing. of us e Bill days. stand lest to Vearly ld it. some jut oF The Most Fascinating Radio Book of the Year! seem mrpited tet ihe reckoned Scape of “REE wit Re FW the HADIO NEWS _——————_ want all the latest facts and developments on Short Wave receiving and transmitting, the Technical Staff of RADIO NEWS in collaboration with the foremost S-W authorities have especially prepared a complete, new, up-to-the-minute SHORT WAVE MANUAL for you. Bwane all you and thousands of other radio men Replete with illustrations, diagrams, charts and plans — crowded with chapters by Lieut. Wen- srom, Hertzberg, Marshall, Spangenberg, Benne- weg and other experts — this volume represents the st word in authentic Short Wave data. You'll be fscinated with such features as: — Breaking into Amateur Transmitting S-W Transmitter for the Average Home and Purse A Portable S-W Transmitter Receiver The A. C. Operated Super-Wasp Crystal-Controlled 200 Watt S-W Transmitter The Egert S-W Four Experiments on Ultra-High Frequencies S-W Stations of the World For Real Thrills Get Down in the Amateur Wave Bands and Multi-wave tshort here’s the book that describes, illustrates M explains everything about S-W’s — that gives m the complete and latest data. And it’s yours THOUT COST! Why It’s FREE! MDIO NEWS has practically twice as many read- a any other radio magazine. But there are still a of you radio men who don’t realize what you are RSS] S. R & Send for Yours TODAY This Big Illustrated Volume Containing All You Want to Know About SHORT WAVES ® Say You Saw It in QST — It Identifies You and Helps QST Do you know that, besides covering every other phase of Radio, RADIO NEWS publishes many exclusive S-W features every month. Every issue keeps you posted on the latest S-W receiving cir- cuits, up-to-the-minute S-W Broadcast Call Lists, S-W Receiver and Transmitter Designs, News from the Amateurs, latest improvements in Portables, etc., etc. You absolutely need RADIO NEWS to keep abreast of all S-W developments. Big Cash Saving — Gift FREE! That’s why, although we will sell thousands of these SHORT WAVE MANUALS for a substantial price, for a limited time you may have a copy ENTIRELY FREE as an inducement to try RADIO NEWS. To introduce RADIO NEWS to you, we will send you the next Eleven Big Numbers almost a full year subscription for only $2 — and will ship you the new 1930 SHORT WAVE MANUAL, postpaid, entirely FREE! You save 75c on the newsstand price of RADIO NEWS and get this invaluable S-W volume WITHOUT COST! Risk nothing. Mail coupon TODAY! ee The NEW RADIO NEWS, Dept. 312, 381 Fourth Avenue, New York, N. Y. Gentlemen: Send me, ENTIRELY FREE, post- paid, the new 1930 SHORT WAVE MANUAL, and enter my subscription for the next Eleven Big Issues of RADIO NEWS at only $2 which I enclose (regular newsstand price $2.75). I understand you will cheer- fully refund me $2 and I may keep the S-W MANUAL if I am not more than satisfied. Name Address City and State Are you a Serviceman 0 Experimenter 0 ? Engineer 0? Dealer 0 Leawane Se SS Bee eee eee eee “tr tt tt titted tee 85

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Yo 'y"t. ‘ : An audibility gauge for the ama- rh udimeter teur. Do you always give the same t on two audio? What about during a noisy mounting Audimeter gives the right ! one on two A.F. as on one tube, during and will repeat itself. You can't duplicate during tests if decently accurate reports t only ends the guessing but it makes Can’t Duplicate Guesses « the price is too low to justify any- 1 with a guess. Calibrated with 5 arbi- » the half-points marked. Has a hand ingle-hole mount and a pointer-knob Serves also as volume control. Get the er is going out of date in amateur rder. Price $2.80 to the amateur. 4 | ho Tiwn.7 L.W.Hatry's latest double-detection de- : ¥"/ sign. A six-tube receiver with three screen- lete story on how to make it and why iptive circular. Band spreading if you et ‘Tl, High-resistance (1000 ohms per volt) 1, . P : ‘ I . tma , oltmeter and any milliammeter range ned. Low pric 1500v. and 500 ma. com combination and get quotation or Cardwell, Electrad, Sangamo, Tobe, National, Frost, Pilot, Signal, tat, etc., at amateur prices. And rr que tons. > & HNatry *vyoung ~~ 159 Phone Anmm Jt. 3-2753 we oo SS ee HARTFORD-CONNECTICUT-U.S.A. Tweces THE CAEATEST RECTIFIER Sette Dpto MARWET To-DAN- A ‘ade - sericea. TUME CAN BEMA THEN THE NATCONAL 10 TUBE G.., Se a AKE®S rT--- it = Say It with Recto Bulbs R3 $10.00 Type R81 $7.00 TIONAL RADIO TUBE CO. 3420-18TH ST. S.F. Dealers cH HICAGO S RADIO SHOP, LEEDS, N. Y BUTLER, MO. Say You Saw It in QS7 It Identifies You and Helps QST Doings at Headquarters OME changes have been made in the per. S sonnel at headquarters since the last ‘‘ Do- ings’”’ were published. Included is the arrival of Mr. Clinton B. DeSoto, W9KL, from Middleton, Wisconsin, who has hooked up with us in the capacity of Assistant to the Secretary, which title Mr. A. L. Budlong relinquishes to become Assistant Secretary. Mrs. Winston Abbott, Dorothy Menk, none other than DEM of Communications Department fame, has a permanent schedule now. The wedding was held April 12th with FEH and EV among those present. WI1SZ has changed location again. The station is located now in the State Armory at Hartford. Nearly every member of the Hq. Staff dropped in at the New England Division Convention in late April at Worcester, Mass., at one time or another. The week before the convention Fred Schnell, former Traffic Manager, was the guest of K. B. Warner. ‘““FS” had his golf outfit in tow. Nuff sed! D. H. Houghton, QS7T’s Circulation Manager, has left for a three weeks’ business tour of the east, and middle west, checking up on QST dis- tribution. Ralph Beaudin is holding down the department in Dave's absence. I. E. Handy is attending the Midwest Division Convention. How the mighty have fallen! We cannot keep the news any longer. James Joseph Lamb, Technical Editor of QS7, was married on May 5th to Miss Josephine Gleason in Hartford. The couple left for the great open spaces following the wedding and Mr. Lamb is booked to turn up at the Midwest Division Convention. Considerable interest is being shown at Hq. in the coming 28-mce. tests in June. —C.C. BR. née Silent Keys It is with deep regret that we record the passing of these amateurs: Ernest R. Hood, W1AOW. George G. Goode, Centerview, Mo., W9GBT. Charles 8. Taylor, Buffalo, N. Y., WS8P2J. Carl E. Trube, Yonkers, N. Y., Ex-2BK. LeRoy A. Dey, Osborne, Kans., W9CNT. Cambridge, Mass., Se Strays “5. PAQOOOOOOQF is reported in a recent list of ealls heard. We’ll bet that station doesn’t sign very often! Or maybe the reporter’s typewriter | stuttered.