QST 1920-08: Vol 4 Iss 1

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E o— o AND ie a8 4 b= A MAGA E DEVOTED EXCLUSIVELY TOQYTHE WIRELESS AMAJEUR

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A. ! iplifying Transformer » 4a a {| oo aa 4. R. CO.” VARIABLE CONDENSER illustrat s made in two capacities—.001 mfd. and .0005 mfd. ancl is nmounted only but with dial and knob if desired. The rotary | rounded on one end affording straight line capacity. The dia oulded composition, scale in white—0—100. Bakelite Knob guarantee this condenser in every way as to « lity, reliabi itisfaction. The low price is decidedly an innov: n. PRICES: Unmounted With Knob and D fd $5.00 $6.00 6.25 7.25 POSTAGE 10 CENTS ' fd pleasure in announcing a branch store at 15 Temple Street, Portland. Maine, he management of Mr. H. W. Castner. TiC RADIO COMPANY Incorporated TREET Branch > 15 TEMPLE STRI MASS. PORTLAND. MAI em a eS, —— — .

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RADIO-CRAFT PRODUCTS. RADIO-CRAFT products set a new high standard of quality in radio apparatus- RADIO-CRAFT laboratories have spent months in perfecting and standardizing their products before placing them on the market. RADIO-CRAFT instruments are thoroughly tested before leaving our plant and bear our absolute guarantee. RADIO-CRAFT purchasers will acquire apparatus of perfect utility, precision, and beauty. DETECTOR AND TWO- he — iER TWO-STAGE oo Size:—84_" x 8% Size:—8¥,"' x 6” x Price $70. 00 Price $50. 00 The RADIO-CRAFT panel design is followed, allowing immediate inspection by simply snapping out the panel. FOR SALE BY— Continental Radio & Electrical Co., N. Y. }.' Manhattan Electrical Supply Co., N. Y. Radio Distributing .Co., Newark, N. J. Radio Engineering Co., Baltimore, Md. Central Electrical & Lock Co., Phila., Pa. Kelly & Phillips, Brooklyn, N. Y. const ean Size:—7 4.” x 44%"’ x 342” Price $15.00 RADIO-CRAFT CO., INC. BROOKLYN, N.Y. Jobbers’ inquiries concerning our distributing proposition are invited. ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Static Eliminators Are Still In The Vi time distanc: possil Dul denser ing ex work ef THI LO Typ D10% D101 D10: D10 Di1 Dili! Dil: D113 Wi! Experimental Stage <now that “strays” are still uncontrollable. The summer- overfriendly to radio work and in order to cover the iired it is important that you get out (or radiate) every f energy. lier Mica Condensers are recognized as the most efficient con- ible. They are employed by all stations which are cover- al distances. If you want to carry on your share of relay ly you should install a Genuine Dubilier Mica Condenser. is a Dubilier for every station. ver this list and decide what type you want. Max. Power Watts Tested Voltage Capacity Price 250 10000 volts 0.007 mfd. $19.00 500 14000 volts 0.007 mfd. 30.00 1000 21000 volts 0.007 mfd. 45.00 1000 25000 volts 0.007 mfd. 50.00 250 10000 volts 0.01 mfd. 21.00 500 14000 volts 0.01 mfd. 35.00 1000 21000 volts 0.01 mfd. 50.00 1000 25000 volts 0.01 mfd. 55.00 Prices on other sizes and capacities on application. 1 want a condenser—wait until you can get a Dubilier. BULLETIN D1Q giving prices and description f our complete line of condensers suitable for C.W. transmission and receiving work is yours for the asking. Send for it to-day. Dealers, Jobbers and Distributors Write For Our Discounts. Pacent Electric Company, Inc. Bu Sales c 150 NASSAU STREET Jers and Specialists in Radio, Electrical and Laboratory Equipment wente for A. H. Grebe & Co., Dubilier Condenser Co., Electrical Products Mfg. hter & Byrne, Rawson Electrical Inst. Co., The Magnavox Co., and others. NEW YORK CITY Telephone Beekman 5810 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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1B465321 Y AWWW THE OFFICIAL ORGAN OF THE AR.R.L. AUGUST, 1920 VOLUME IV \ = The A.R.R.L. QSS Tests 5 A Ham on the Telephone Tewpieye 6 Navy Receiving Equipment (Part II, Concluded) L. C. F. Horle s An Efficient and Flexible Receiving Set A. L. Groves 10 Our Radio Dime Museum D. A. Hoffman 13 The New York Radio Central Station 14 Old “WCC”, Cape Cod “An Old Timer” 17 Code Instruction Tables 17 Some Characteristics of the Underground System 18 A New Type of Variable 19 A Boardwalk Roller-Chair Radiophone 20 Clapp-Eastham % Kilowatt Hytone Transmitting Panel 20 Editorials 21 The Operating Department 23 Who’s Who in Amateur Wireless 31 QST’s Directory of Calls 33 Amateur Radio Stations 35 With the Affiliated Clubs 38 Amateur Radio in Holland Seefred Bros. 40 Strays 41 The Heterogeneropliodynatron Herbert Richter 44 Radio Communications by the Amateurs 46 | Concerts de 2AB 53 va Calls Heard 54 QST is publis Conn. Ke monthly by The American Radio Relay League, Inc., at Hartford, th B. Warner (Secretary, A.R.R.L.), Manager and Editor. jon price, $2.00 per year, anywhere. Single Copies, 20 Cents. second-class matter May 29, 1919, at the post office at Hartford, Connecticut, under the Act of March 3, 1879. Copyright, 1920, by The American Radio Relay League, Inc. itle registered at United States Patent Office. ” THE AMERICAN RADIO RELAY LEAGUE, Inc. HARTFORD, CONN. —WWWv

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Static Eliminators Are Still In The | * Experimental Stage | ill know that “strays” are still uncontrollable. The summer- time t overfriendly to radio work and in order to cover the dista required it is important that you get out (or radiate) every possil r of energy. : Dubilier Mica Condensers are recognized as the most efficient con- dens« 1ilable. They are employed by all stations which are cover- ing « nal distances. If you want to carry on your share of relay work ively you should install a Genuine Dubilier Mica Condenser. , RE is a Dubilier for every station. over this list and decide what type you want. | Max. | Power Watts Tested Voltage Capacity Price D100 250 10000 volts 0.007 mfd. $19.00 D101 500 14000 volts 0.007 mfd. 30.00 D102 1000 21000 volts 0.007 mfd. 45.00 D103 1000 25000 volts 0.007 mfd. 50.00 D110 250 10000 volts 0.01 mfd. 21.00 D111 500 14000 volts 0.01 mfd. 35.00 D112 1000 21000 volts 0.01 mfd. 50.00 D113 1000 25000 volts 0.01 mfd. 55.00 i Prices on other sizes and capacities on application. 4 N you want a condenser—wait until you can get a Dubilier. BULLETIN D1Q giving prices and description of our complete line of condensers suitable for C.W. transmission and receiving work is yours for the asking. Send for it to-day. Dealers, Jobbers and Distributors Write For Our Discounts. Pacent Electric Company, Inc. tuilders and Specialists in Radio, Electrical and Laboratory Equipment » Agents for A. H. Grebe & Co., Dubilier Condenser Co., Electrical Products Mfg. Richter & Byrne, Rawson Electrical Inst. Co., The Magnavox Co., and others. 150 NASSAU STREET Boskete sie NEW YORK CITY 2 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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OcB465321 W/W THE OFFICIAL ORGAN OF THE AR.RLL. AUGUST, 1920 VOLUME Iv ¥ No. 1 The A.R.R.L. QSS Tests 5 A Ham on the Telephone Tewpieye 6 Navy Receiving Equipment (Part II, Concluded) L. C. F. Horle 8 An Efficient and Flexible Receiving Set A. L. Groves 10 Our Radio Dime Museum D. A. Hoffman 13 The New York Radio Central Station 14 Old “WCC”, Cape Cod “An Old Timer” 17 Code Instruction Tables 17 Some Characteristics of the Underground System 18 A New Type of Variable 19 A Boardwalk Roller-Chair Radiophone 20 Clapp-Eastham % Kilowatt Hytone Transmitting Panel 20 Editorials 21 The Operating Department 23 Who’s Who in Amateur Wireless 31 QST’s Directory of Calls 33 Amateur Radio Stations 35 With the Affiliated Clubs 38 Amateur Radio in Holland Seefred Bros. 40 Strays 41 The Heterogeneropliodynatron Herbert Richter 44 Radio Communications by the Amateurs 16 Concerts de 2AB 53 Calls Heard 54 QST is publis monthly by The American Radio Relay League, Inc., at Hartford, K h B. Warner (Secretary, A.R.R.L.), Manager and Editor. jon price, $2.00 per year, anywhere. Single Copies, 20 Cents. Entered second-class matter May 29, 1919, at the post office at Hartford, Connecticut, under the Act of March 3, 1879. \ Coprtgne, 1920, by The American Radio Relay League, Inc. itle registered at United States Patent Office. THE AMERICAN RADIO RELAY LEAGUE, Inc. HARTFORD, CONN. AWWW = Kk

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THI \MERICAN RADIO RELAY LEAGUE INCORPORATED jational non-commercial organization of radio ‘ iteurs. bonded for the more effective relaying of ly messages between their stations, for legis- live protection, MAXIM -E, JR OFFICERS Traffic Manager J. O. SMITH 73 Hillside Ave. Rockville Centre, L. I. DIRECTORS W. T. GRAVELY Danville, Va. F. H. HAMILTON Indianapolis A. A. HEBERT Nutley, N. J. HIRAM PERCY MAXIM Hartford, Conn, Cc. R. RUNYON, JR. Yonkers, N. Y. OPERATING DEPARTMENT WEST GULF DIVISION Manager Frank M. Corlett, 1101 East Eighth St Dallas, Tex. ALASKAN DIVISION Manager Theodore A. Stocking Ketchikan, Alaska ROCKY MOUNTAIN DIV. Manager M. S. Andelin Richfield, Utah PACIFIC DIVISION Assistant Manager G. Arnold 181 No. 17th St, San Jose, Calif. ST. LAWRENCE DIVISION Manager Albert J. Lorimer 243 Mackay St. Montreal, Que. ONTARIO DIVISION Manager A. H. Keith Russell 353 Markham St Toronto, Ont. and for scientific growth.” Treasurer A. A. HEBERT Nutley, N. J. Secretary K. B. WARNER Hartford, Conn. Cc. A. SERVICE, JR. Bala, Pa. J. O. SMITH Rockville Centre, L. L H. L. STANLEY Babylon, L. L Cc. H. STEWART St. David's, Pa. K. B. WARNER Hartford, Conn. M. B. WEST Waukegan, Ill NEW ENGLAND DIV. Manager Guy R. Entwistle 137 Sutherland Road Brookline, Mass. ROANOKE DIVISION Manager W. T. Gravely 854 Main St. Danville, Va. DELTA DIVISION Manager John M. Clayton 1301 Welch St. Little Rock, Ark. MIDWEST DIVISION Manager L. A. Benson 4942 Wiesehan Ave. St. Louis DAKOTA DIVISION Manager Russell H. Pray Valley City, N. D. NORTHWESTERN DIV. Acting Manager, Royal Mumford Vancouver, Wash. eneral Correspondence to Executive Headquarters, Hartford. Conn. re

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© A Magazine Devoted Exclusively to Amateur Radio r PULA ea ii i r TTT 7 i IMU NSO i Hi Na Plas moe The A.R.R.L. QSS Tests The Bureau Tests End and the League Tests Begin. S this article is written, the A.R.R.L. Fading Tests are beginning all over the country, and we have every reason to feel that they will be as interesting and as successful in the securing of valuable data as were the co-operative Bureau of Standards A.R.R L. tests. Readers who are not familiar with the tests are referred to the opening articles in the two preceding issues of QST, where complete details are announced In each A.R.R.L. Division transmissions by well known stations have been arranged, and a form for checking the variation of audibil- ity is given. The Division Managers have appointed Fading Analysts for each section, and a uniform system of tabulating and studying the data has been adopted. If we all pull together on these tests, much of scientific value should be accom- plished. It is hoped that every A R.R.L. man will feel it a duty to participate and aid in this important work. All stations are requested to keep their transmitting at a minimum during the time of these tests in their territory. It is believed that experience in the conduct of these tests will show that the system being followed can be improved, so that rather than continue this first series indefinitely it has been thot advisable to announce Aug. 3lst as the concluding date. Referring then to the schedule published in last month’s QST, all schedules for dates after Aug. 31st are hereby cancelled. Division Managers will arrange for the broadcasting within their division, at the proper time, of any portions of their sched- ules not published in full up to Aug. 31st in the July issue. There are two corrections in the New England Division schedule as published. Aug. 14th for 1PG, read 1PY, Westerly, R. I. Aug. 28th, for 1WR, read 1AK, Fall River, Mass. 1KAY is Portland Me. Now a word to the recorders. Make curves on as many transmitters as you can, but if the schedules call for transmitting on each test night by stations in adjoining divisions and you can get either one at will, pick out the one to which you will regularly devote your attention and record it every possible test night at that time. That is, do not switch your recording to a new station every night—it is more important to have regular reports on the same trans- mitter, so that variations from normal re- ception may be noted. The recording form calls for a check-mark in the proper square. This works very satisfactorily where the swinging is gradual, but some stations fade so rapidly as to go thru most of their cycle during the transmitting of one group of letters. In such cases it is suggested that numerous small dots be tallied (possibly one per letter, even), to be connected by a curve immediately after the schedule. Another important thing is that a record on a station whose signals are extremely loud thruout the transmission will not show fading and will therefore be without value. If a station is regularly received with in- tensity 9, reduce filament current or cut out a stage of amplification. This will re- duce the strength to a value where changes in audibility will be readily noticed. But be sure to note on the record that this has been done and also, if possible, note during the QST call the strength with the set in normal order. Because progress in the Bureau of Stand- ards tests showed that some rearrangement of the stution network would add greatly to their value, the tests were terminated on July 17th. This was in accordance with the original scheme. Improvements in the methods of transmitting and recording are under consideration, and these will make it possible to plan future tests very satis- factorily. The network laid out for these first tests by our Operating Department

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| sound R. | ende: upe n QsST August, 1920 perfect satisfaction, and fine work has been done ng stations. These men difficult task has been nd the Bureau wishes to ly for their efforts. Bureau completes the data and draws conclu- 1ey will be announced So far, the indications ena are caused by re- of the waves, as has by many. Perhaps the of the tests is that no ving around the trans- served, as was expected inverse curves have opposite sides of the ore important, on the transmitter at different feature is intimately it is being called “pro- e occurrence of certain ely along the curve at the same general line The Bureau cites as ilar part of a curve f 2JU which began at letter A; at Bristol, ter B; at Laconia, N. H., nd at Boston with the eved that a study of the r, and phase relations ill make it possible to tion of the reflecting st, which caused the this we may hope to f the medium, and so s for overcoming the * the opinion that the so- eived wave length, as correspondents, are largely receiving circuit effects. A regen- erative receiver is very critical as to fila- ment temperature and a small change in this factor causes marked tuning effects. These can be compensated for by readjust- ing the set, the operator receiving the impression that the incoming wave has changed. Another important thing is that the adjustment of a regenerative set that is best for strong signals is not the same as the best adjustment for weak signals of the same wave length, and as it is vir- tually impossible to tell whether a partic- ular adjustment of such a set is a tuning or regenerating adjustment, the operator is easily deceived into the belief that the wave length has changed. This would not occur in non-regenerative receivers, but the latter do not have the needed sensitive- ness. It is believed possible, however, for a transmitter emitting a band of wave lengths to fade out on one wave length at a particular receiving point and simultan- eously swing in on another wave, for the reason that two different frequencies when reflected or refracted by the same con- ducting mass or surface, do not interfere subtractively at the same point. Mr. Frank Conrad, of 8XK, has suggested that a send- ing station with two “humps” sufficiently far apart could send to a receiving set tuned to both waves with a very good chance of unbroken reception, and support- ing this theory is the observation that, so far as known, it is not possible to recover the signals of a fading C.W. (or modulated C.W.) station by retuning. All in all, the QSS Tests are proving immensely interesting and promise to de- velop information on short wave transmis- sion problems which will prove of the highest value to us amateurs. Watch QST for further information. A Ham On The Telephone By Tewpieye his debut in QST with a good one. Ever imagine what radio nomenclature must uninitiated? This is a story about just that.—Editor. BARNEY was an ardent lover, and often wav- fidelity between the two When in the equally presence of one the completely obliviated, inoculated sentimental- by rather obvious code r affinity via the A. R. oon, following a futile some easily imposed- would accept his MSG which according to cable count would have made its recipient a millionaire, he finally resorted to the telephone, Now Mr. Barney was a resident of a New York apartment house and conse- quently suffered all their advantages and equally enjoyed their manifold discomforts. He frantically oscillated the unoffending phone hook, yelled profanely into the transmitter and placed his receiver in prox- imity to the mouthpiece without raising the slightest satisfying squeak, before he

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August, 1920 ultimately replaced the damaged phone stand, and carefully noting that the re- ceiver was NOT on the hook, made his fuming way to the real estate office, in the building. He was there informed that ser- vice was NIL, owing to the absence of an operator, and that in all probability it would continue so for an indefinite period. Sensing a chance to make the maximum of money with the minimum of work, James offered his able self in the temporary ca- pacity of switchboard operator. Needless to say he was immediately accepted. After settling himself with all possible comfort in the operator’s chair his first act officially was to remove the caps from the receivers. Making a serious pretext of tightening some perfectly firm binding posts he savagely jammed a plug into Cen- tral. “‘Number please?” “QSD”, in an interrogative tone. *“‘Number please’’. “QSD QSD P-S-E”’. “Do you want information?’ “No—no”’ Then compre- QSsT 7 “Hello, hello, O.K. now, shoot.” connect me with the real-estate office, please . “Sorry but they piped down about an hour ago.” “They what?” “Piped down, layed off, closed shop” ex- plained the sophisticated James. “I’ll take an MSG for them though.” “Oh they are closed—Well this is im- portant. Will you please give them a mes- sage as soon as they open?” “QSR”. “What?” “Sure thing, I'll relay the message. Shoot’’. “Well, just tell t. »-m that the people be- low are making an awful noise. It’s some sort of a telegraph affair, and their wires come right down outside of our windows. Our wash-woman was almost killed when she hung clothes on it last Monday. We can’t sleep at all nights when it is buzzing, and our lights get dim and it is impossible hending that all operators did not necessarily come under Coming Soon to read. Also sparks fly from the ceiling in the dining room”, “Yes mam, that’s outrage- genus radio, James condes- An analysis of the J cended to the explanatory— QSS reports in the ous. I shall report it and see “QSD what time have you?” “Bustands”— A. ty — that it is stopped.” Mr. “un oat cy ay * , tests; a paper on e . . s a Four twenty-five. performance of our Barney made a mental reser “OK Thanks old man, call stations in these tests, vation to replace his kick- you later.” Crash, and the by Mr. S. Kruse; some back-preventer the next time . dope on the use of plug returned to its place. spark coils as a source he saw his set. After painfully setting his watch, the erstwhile operator, paying not the least attention to the frantic dropping of a paltry dozen or so annuncia- tors, again plugged Central and gave her the number of of modulated plate potential for C.W. tele- graphy; a cheap and easily-made rectifier which will give 350 watts dc. for C.W. Watch for these articles. “Well”, he soliloquized, it’s sure lucky I got in on this. Gee, supposin’ it had got to the office MIM. Ye Gods! Maybe there’s some more of them flying around.” He plugged in on the his lady love. There then ensued a beautiful half-hour conversation, interrupted but once when Mr. Barney smothered the persistent buzzer with his cap. As soon as this conversation reached the ultimate of its many endings, James again experimented with his apparatus ere he felt competent to answer the now innumer- able calls) He jammed in half of the party plugs and leaned heavily on as many trunk buttons and anxiously awaited the result. The inevitable happened. Half the popu- lation of the house answered with a con- fused “Hello hello’’. James, not quite expecting this, was at a loss as how to reply, but his radio intelli- gence soon came to his rescue. “Testing-testing de-de-de-dah,” he bawled into the transmitter, and desper- ately yanked the plugs. Having at last determined which were the party jacks by the above conclusive tests, he cautiously proceeded to answer calls. apartment below his. “Hello, this is the office speaking. Are there any complaints you wish to file this month, Mrs. Jackson?” “Why, nothing in particular, only our lights went out last night and haven’t been on since.” “Oh yes, well—er-er-the er-power com- pany shut off the juice last night, Mrs. Jackson, but it will be on tonight.” Behold another mental resolution: to re- place the fuses borrowed from the meter on the floor below. “Well, now, I sure did nip that in the bud.” BUZZ, BUZZ, BUZZ. “Hello-hello-hello-hel-l-l-l-oo. t).cee, four, five, go ahead’”’. “Connect me with Mr. Stone’s apart- ment, please, I’ve been trying to get you for the last half hour.” “Yes mam’’, and he shoved the plug into the handiest jack while he searched the list for Mr. Stone. (Concluded on page 43) One, two,

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Ha the

QST August, 1920 Navy Receiving Equipment By L. C. F. Horle Part Il—Concluded eectiug of the Radio Club of America, Columbia University, March 26, 1920 direction of Prof. then connected with a consulting capacity, done before the actual und the various develop- earch were incorporated eiver. of this receiver effort ire wide wave length vity, freedom from local ity in regenerative am- ty of operation, com- and cheapness of vith established practice, have inductance coils ps, six in number, and ble air condensers giving length ranges from 260 0 meters when the capa- na is .0004, and up to the capacity is .0009 practice of sectionalizing the unused portions of vid “resonant coils’”’ has the windings being now and merely _ short- proper taps. This com- “resonant coils” and le and rugged construction. is such that the the short-circuited and of the coils is loose, so introduced. ctor contributing toward in this receiver is the her ratio of inductance to Fig. 3. Panel View, SE-1420. capacity than has hitherto been customary; the antenna condenser having a capacity of .0015 microfarad, and the secondary condenser of .00075 microfarad, whereas the type SE-1220 and other receivers of similar wave length range had capacities of .005 and .003 microfarad respectively. Compactness and proper distribution of

[T7 Ie ne aon \ Ut ae ee a er ( Y i £¢ \ boty . pare - 4 fo —=> = | 7 ° en - : > | ° om s= st ~! — | {N st | {— i] iil io => \— | => b> | —atetotey SS 2 } — —~——__ —_+,, 3° , ‘ ian od | , me — $4 » Fei aL winding spaces are secured by reducing the size of the Litz wire used to 20 strands of No. 38 wire and by winding the suc- cessive taps in increasing numbers of banks. Interference from short-wave nearby stations and from transmitting apparatus in close proximity to the receiver is elimin- ated by the use of grounded sheet-copper shielding completely enclosing and separ- ating the antenna and secondary circuits. To completely eliminate capacity coupling, the coupling coil is provided with a novel electro-static shield con- sisting of an additional winding placed over it, the capacity current in this winding inducing in the coupling coil voltage which exactly neutralizes that resulting from capacity current in the coupling coil. The coupling coil is placed in the secondary circuit instead of in the antenna circuit chiefly for the purpose of ob- taining sufficient coupling with- out the use of taps to secure the low wave lengths, as the in- ductance of the antenna would otherwise prevent this. To se- cure complete stability in regen- erative amplification, the stopp-

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August, 1920 ing condenser and grid leak are discarded, and the grid is connected through the secondary inductance to a point on the filament rheostat selected to give a nega- tive grid potential or “bias” of about 1.3 volts with a Type SE-1444 tube, and about 2.2 volts with a Type CW-933 tube. Oscillation control over the entire wave length range with both types of tubes above mentioned necessitates a _ large tickler, and in order to avoid resonant effects from this tickler at the shortest wave lengths, it is made in the form of a variometer, having a stationary part wound alongside of the secondary inductance coil, and allowing the plate circuit to be tuned. The difficulty which frequently arises in short wave heterodyne reception from the capacity between the operator’s hand and the secondary circuit (which may change the note sufficiently to make it inaudible) is eliminated by the use of an audio fre- quency choke coil and telephone conden- ser which prevents radio-frequency current from reaching the telephones. The receiver permits the use of either the crystal or the vacuum tube detector, and contains within itself the receptacle and controls for the latter. The terminals of the secondary circuit are brought out for connection to a radio-frequency ampli- fier when the crystal-audion switch is thrown to the left. The standard auxiliar- ies, such as the filament ammeter, test buzzer, push button, etc., are clearly shown in the photograph, Fig. 3. The con- struction is simplified and cheapened by the introduction of unit assemblies, en- abling the separate elements of the appar- atus to be assembled independently in- stead of being built into a single panel. Following the design of the SE-1420 receiver came the need for a radio com- pass receiver of greater selectivity and sensibility than had been available previ- ously. The use of unilateral operation has been abandoned because of the diffi- culty in securing reliable bearings with the personnel available for operating the equipment. The possibility of using radio frequency amplification for this type of radio reception was investigated but it seemed evident while this investigation was being made that high power audio- frequency amplification would best meet the service needs, particularly since there was evidence at hand indicating that greater precision of bearing determination could be made if reception was done with the tube in oscillation. On the basis of this data the SE-1440 receiver was designed. A series of amplifiers has been developed at the Radio Laboratory that should meet the needs of the service very satisfactorily. QST 9 They are designed (1) to supply moder- ately high audio-frequency amplifications where conditions are such that an ordinary antenna is available, or (2) to supply high audio-frequency amplifications where low antenna or loop reception is to be done over a great range in wave lengths, or (3) to supply high radio and audio-frequency amplification where extremely high ampli- fications are necessary and where the range in wave lengths is not greater than three to one. Fig. 4. Three Step Audio Amplifier (Electrically Shielded). SE-1599. For use under conditions specified in (1), the SE-1600-A amplifiers are well suited. These amplifiers use two of the SE-1444 or CW-933 (Western Electric “J’”) tubes in connection with the two audio-frequency transformers. The SE-1600-A uses iron core trans- formers. The coils of the transformers are machine wound with No. 44 copper wire. The layers are insulated from each other by means of paper and the whole coil impregnated with wax. The primary consists of 3900 turns and the secondary of 12,000 turns, the ratio being somewhat greater than three to one. The core is built up of 5-mil silicon steel. Three tele- phone jacks are provided by means of which the telephones may be connected in the plate circuit of the detector tube or in the plate circuit of either of the amplifier tubes. For use under conditions outlined in (2) the SE-1599 amplifier has been designed. (Fig. 4). This amplifier con- sists of three amplifying tubes and three

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10 QST August, 1920 am] rmers of the audio- The ranges of these amplifiers are freque [The whole device is approximately as follows: thor and every means SE-1611 400 to 1000 meters adopt free of disturbance SE-1613 1000 to 3000 meters due itself or between it SE-1615 3000 to 10000 meters and It is designed to SE-1617 6000 to 20000 meters meet ry high amplifications wher in wave lengths is es is suited for opera- tion ipplied with “audion cont h receivers equipped wit} tectors. A two point les for cutting out th amplification when ntrol of the ampli- iplished by adjusting conditions outlined SE-1613, SE-1615, have been designed. 7 of the radio-audio- fr employ six SE-1444 t ransformers are used for ind audio frequency radio frequency trans- ajor details in which thes fer from one another, each its transformer de- ! amplification over a velengths. In addition to the above series of ampli- fiers there have been several types of amplifiers designed for special applica- tions. The most interesting of these is, perhaps, the SE-1493. This amplifier con- sists of 4 tubes and three radio-frequency transformers having a range of 400 to 1,000 meters. The last tube of the series acts as a detector. It is designed to meet the need for radio-frequency amplification of this range where audio-frequency ampli- fication in the form of the SE-1600 is already available and requires no “audion control box” for its operation. This covers in general the trend of Navy Receiver development and illustrates the variety of apparatus required to meet the growing need of the service for special designs and purposes. No attempt has been made to emphasize the tremendous efforts necessary to perfect each detail under pressure of war conditions but the results of the work well justified this care- ful development. An Efficient and Flexible Receiving Set By A. L. Groves article the w ~ that Mr. Groves has done some exceptionally good receiving work, and in this set with which he does it, in such a manner that anyone may duplicate his result s an exponent of the “three-coil” circuit for short waves as well as long, but : orly directed to the fact that for the reception of short waves the third coil is NOT a astead forms the inductance for an Armstrong tuned-plate-circuit hook-up, a method t of us have found superior to the tickler for amateur work. The diameter of Mr. Groves was chosen after experimenting with every diameter from one inch t s, and gave the best results. We are fortunate in having this pioneer work already This dope can be depended on.—Editor. ateurs have expressed know what kind of a obtaining results re- some of my previous QST, I here present a full pl t, showing location of instru ring methods, etc. \ , the set presents noth- ing r unless we take into con- siderat reme simplicity of the whol this to a great extent account rking efficiency of the set, for not work at greatest efficier npered by unnecessary truments placed on the sition that long leads and 1 r s occur. The audion is a ve nstrument and every inch of ry wire, every un- nece : nt or other instrument, has its These little things might not amount to very much taken separately, but collectively they amount to much, and no pains should be spared to have as few instruments as possible, wired with heavy wire as directly as pos- sible. Fig. 1 represents a set 20 by 20 inches front panel, and 10 inches deep. The depth may be only 8 inches, depending upon the size of A and B Batteries used. The switches 1, 9 and 10 are one inch switch blades. Condensers 3 and 13 are Illinois 13 plate condensers. Condenser 12 may be either 13, 23, or 43 plate, de- pending upon the maximum wave desired to receive from, using the DeForest honey- comb coils. If the 13 plate condenser is used, waves up to and including that of WII (formerly NFF) on 13,600 meters may be tuned to. A 23-plate one will just about take in NSS on 16,900 meters, | | | |

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E | | | August, 1920 while the 43 plate one will tune to about 20,000 meters. DeForest claims 25,000, but if you get 20,000 you will do well. In fact, under actual working conditions all of the DeForest coils have lower minimum and maximum waves than those listed in their catalogue. Coil L-600 deviates from their figures to a greater extent than any other. They claim from 4,000 to 12,000 meters with it, while its working range is approximately 2,200 to 8,600 meters. QsT 11 the Parkin, selected for its small size and simplicity. The grid leak must be variable and is of the switch-lever-pencil-mark type. Point 6 is the junction point of the plate circuit, stopping condenser, and re- ceivers. The condenser used is_ the DeForest fixed condenser of .002 Mfds., and from this point a regular lamp cord is run to the point where it is desired to attach the receivers. The coil mounting, 7, is the regular DeForest 3-coil mounting, prefer- ably the ULC-400. 0 Prones While the DeForest Honeycombs are excellent for long wave work, they are not suitable for best re- sults on the short waves, and at the time of writing this article a new type of coil called the Duo-Lateral Coil has just made its appearance. I hardly believe these coils will prove any more efficient on short waves than the honeycombs, “" I wound three coils of this type by hand back in April on 2%-inch cy inders and while it was not expected thatthe hand-wound coilswould show anything startling, a comparison be- tween them and hand-wound honey- comb coils failed to show enough to warrant further experimenting with them, on the short waves at least. For amateur waves, or we may say for waves below 600 meters, nothing brought out to date is more efficient (under actual working con- ditions) than the old time straight B. Battery Switch. Variable Grid Leak. Grid Condenser. Audion Socket. Shelf for B. Battery. Fixed Condenser. DeForest 3-Coil Mounting. Aerial and Ground Connections. Series-Parallel Switch. Primary Condenser. Secondary Condenser. 13. Plate Condenser. 14. Rheostat. Dotted lines at top, B. Battery. Dotted lines at bottom, A. Battery. The primary condenser, 4, should have a maximum capacity of at least .0015 mfds. and may be either the DeForest, Clapp- Eastham balanced or other standard con- densers designed for panel mounting. Switches 9 and 10 throw the primary condenser in series with the aerial when both are thrown to the left as shown. If 9 is moved to the right, leaving 10 to the left the aerial is cut straight through and the condenser cut out. If both 9 and 10 are thrown to the right the condenser is connected in parallel to the primary coil. This simple arrangement will be found more efficient than the usual 4-blade 8-point switches used for this purpose. The rheostat, 14, used by the writer is OS DAIM Om Ore as nw ° ‘ ~ c—) single layered coils. The only previous objections to them was the inefficiency of the trans- former, when made in the regular primary- secondary loose coupler style with its sliders and taps, dead-end effects and clumsy couplings, etc. The loose coupler had its day in the days of crystal detectors, but it has no place in the modern tube set of today. Fortunately it is an easy matter to build coils of the correct size to fit the DeForest Mounting for short wave work, which are used in exactly the same manner as the regular coils, thereby doing away with the dead-end effects, taps, sliders, etc., and at the same time producing a most efficient set. A little experimenting by each indi- vidual to produce the exact number of turns in each coil is necessary, but once the correct values are determined the results obtained will more than pay you for the little trouble and care you have taken. The best coils to use are composed of Bakelite tubing 5% inches inside diameter with % inch wall, giving an outside dia- meter of 5% inches. svinch Bakelite sheet- ing is secured to make the bands on which to mount the coils on the regular DeForest

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12 QSsT be taken from your un- rtwave coils. purchased in lengths rang- inches wide if you wish rom 200 to 600 meters r if for short waves only, they may all be 1 inch 22 SCC wire are wound hich will give a minimum itely 200 meters when ry ind on the next coil, and These three coils will he entire amateur field RECTION ars e iency in the secondary ng the coils it may be that on a cylinder of this pproximately equals 200 00 meters, 50 turns 400 00 meters, and 80 turns the secondary condenser apacity. As the neces- irns increases, wider cyl- wire are used. The 600 requires the 1% inch cyl- th No. 30 SCC wire and e excellent results up to 00 meters. I leave it to to wind as few or as many l, in most cases, one of laries can be used. This hat upon the character of average Class 2 Marconi or four 22% volt B Bat- 1 coil of 15 turns for the 10 meters and one of 35 eters. In tuning on short remembered the inductive the plate coil is undesirable; » plate coil is swung wide t will go and the plate coil shed by the plate condenser I r of the primary coil or ibly cause the average ama- t difficulty, as no idea can as to just what size these less than 10 turns should amateurs will be able to August, 1920 judge about what size to start on by the number of turns they already use for a given wave, then after a start is obtained the rest is easy. Perhaps the best plan would be to wind the coils for 10, 15, 20, 25, 30 and 35 turns right at the start (6 coils in all); then you will be practically sure to have sufficient coils for primary, secondary and plate for all the amateur waves. After these other coils are wound as needed and while this method may seem a little clumsy to some or too much work to others, I do not believe there has yet been brought out anything that will equal them under actual working conditions, and the advantage you have in working out the exact number of turns, size wire, spacing, etc., for each coil to bring the set up exactly to your individual requirements is not to be overlooked and will in itself add much to the efficiency of the set. The coils are all wound in the same direction and with as large size wire as the number of turns necessary on a certain width cylinder will allow. They are held facing you as in Fig. 2 The wire is start- ed on the side towards you and wound to the right. After the correct number of turns have been wound on, and the ends of wire made fast, it is mounted on the plug by the Bakelite band in the regular DeForest manner, care being taken that in all coils the end of wire where you started winding is connected to the plug and the last end of wire where you stopped is connected to the socket. This can be conveniently done by simply bringing the ends of wire to the metal plate and screw which holds the Bakelite band, as these screws connect firmly to the plug and socket, respectively. After the correct sizes have been deter- mined the leads may be soldered to the plugs in the regular manner if desired. Be very careful to wind all coils in the same direction and to connect to the plugs in the same manner. Using a set exactly as described, amateur signals are being received on a 30 foot aerial the first week in July in twilight at distances ranging from 125 to 200 miles with an average audibility loud enough to be heard with the receiver held at arms length, while many are loud enough to be heard over the entire room. Only a single Mrconi Class 2 bulb is used. (Editor’s Note: Mr. Groves is now using a filament hot-wire ammeter, with a two-point switch in the filament circuit, not shown. The switch cuts on and off the filament current once the rheostat is properly adjusted, and also turns it through the ammeter when desired, saving the meter and the drain on the battery when the meter is not desired.) ——T

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on Oo @ rv ae2z eoocoenR & August, 1920 QsT OUF ppto pie yorrMan Muse| (1¢ war Tax) A VERITABLE TREASURE HOUSE OF VALUABLE MISINFORMATION FOR THE UNINITIATED LB * SPILLING tat | TRANSFORMER : iI oG Olle” THE CROCHETED wT" THAT THE PACIFIC * TICKLER (FEATHER TYPE) OSCULATION RADIO DISTRIBUTING CO. REFERS TO IN THE JUNE OST ——~ NI .- ea Ns LIGHT PLANT GROWN FROM AUDION BULB

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_— QST August, 1920 The New York Radio Central Station Super Powered Radio Station To Be Erected By The Radio Corporation of America 14 O] re than two decades the won- f wireless have so unceasingly rigued the public imagination t would appear little remained accomplished in developments of r ynary character. Yet, once agair disclosed that a startling con- cept reless communication has been quiet ight to a point of realization. On t th shore of Long Island, near New the Radio Corporation of Amer about to begin construction of a supe wered radio station that will simultaneously send to and receive mes- operate simultaneously and will transmit and receive messages continuously during day and night. As soon as the station is completed, immediate message service will be established with France and Germany to supplement the existing commercial cir- cuits; ultimately, radio from this station will connect up Buenos Aires and other points in South America, and two-way com- munication will be established with Poland, Sweden, Italy, Denmark and other Euro- pean countries. It is a plant that dwarfs all existing wireless stations into insignifi- cance; a single unit will have power and at > ee m — = . sages fr five nations of other continents. The 1 and great medium of far-reach- ing « ic and political influence will bear me of New York Radio Central Stat steel towers of which will arise on i00-acre tract, comprising nearly ten re miles of land lying east of Port Jeff vith a long frontage on Long Islat nd. The preliminary engineer- ing have been completed, contracts for e construction material are being let, a the J. G. White Engineering Co. is imi itely taking the big job in hand. There will be five complete transmitters, each , duplex unit with a correspond- ing 1 ving station located nearby. All five ti tters and the five receivers will range the equivalent of the largest wireless stations in the world today, and all the units may be operated in multiple if de- sired. The form of aerial] construction is a new departure using the Alexanderson mul- tiple-tuned system. From the central pow- er house six aerial spans will radiate out in a star pattern, to a distance of more than one mile from the center. This huge antenna will be carried on Se steel towers, each 400 feet in height, wit the wires suspended at the top between 150-foot across arms. Each of the six T-antennae will have twelve towers, form- ing, so to speak, the spokes of a giant wheel fashioned out of seventy-two miniature re-

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ee | August, 1920 plicas of the famous Eiffel Tower in France. Five of these antennae will be used for regular service while the sixth is reserved for emergency operation. The apparatus and system which will be installed for each of the five units will be the same as that at present in the New Brunswick station. Every exacting re- quirement of commercial radio message ser- vice will be satisfied in the apparatus of circuits with which the station will be equipped. The generation of the energy will be effected by Alexanderson alterna- tors constructed by the General Electric Company. This machine is the concrete expression of an ideal which electrical en- gineers have held for many years, for it represents a perfected generator of high frequency electrical oscillations constructed along the lines of the ordinary power house dynamo. The problems solved by Alexan- derson, chief engineer of the Radio Cor- poration, were thought insurmountable. Because the transmission of radio signals requires alternating currents of frequen- cies a thousand times or more in excess of those used in power engineering, it was considered beyond the range of practica- bility to obtain such currents from a dyna- mo. In the Alexanderson alternator equipment, the new station will have a source of energy as reliable as the power dynamo, yet creating a steady stream of electromagnetic oscillations. So efficient and reliable has the Alexanderson 200-kilo- watt alternator installed at New Brunswick proven itself, that leading radio experts of Europe have made special] trips of investi- gation to the United States to view its per- formance; now this already famous single machine is to be duplicated and installed in the New York Radio Central Station; but this time there will be two 200-kilowatt machines for each transmitting station— ten in all. The achievement, from a radio engineering standpoint has nothing ap- proaching a parallel: ten alternators, 2000- kilowatts, 3000 horse power—an astound- ing force to concentrate in realization of a dream to transmit messages over the world to all points of the compass from a single source! A great saving in power is effected by the use of the Alexanderson multiple-tuned antenna. In fact, for the same power in- put formerly used for a single station, six times the effectiveness at a distance is ob- tained. In other words the same effect at a distance with 200-kilowatts input is ob- tained as would be obtained from the old type of antenna with 1200-kilowatts input. This new type of antenna is the equivalent of six independent radiators, all operating in unison at the same wave length, and for the complete station with its five antennae units, the power required will be less than 20 per cent. of that formerly necessary QsT 15 The project however, contemplates addi- tional] possibilities. To illustrate: in many cases, but one-half of a single spoke of the antenna system may be utilized for com- munication service to a certain point. On this basis the Long Island Station will ulti- mately permit simultaneous transmissions to a maximum number of ten points in the world, thus doubling the communication fa- cilities originally planned. The receiving aerials are of a new type, designed for operation with the improved Weagant system of stray elimination, which, by a combination of opposed elec- trical circuits, nullifies the effects of atmos- pheric electricity and makes possible unin- terrupted reception from foreign countries under all weather conditions. We under- stand the Weagant system has been greatly improved since its announcement, and that Dr. Alexanderson has chosen it as the best available circuit for this work. The receiv- ing units are located only eighteen miles from the multiplex transmitting equipment, instead of following the former practice of establishing one transmitter and one receiver in one locality and restricting the service of the circuit to one overseas desti- nation. The arrangements for distant control of the New York Radio Central Station fol- low the same policy of concentration. In Broad Street, the heart of New York’s financial district, the company’s public tele- graph office is being re-equipped to handle the new station’s traffic along with the ra- diograms which are now received for Eng- land, Norway, Hawaii and Japan. Thus messages for any of the five additional countries reached by the new station will be received in the New York City office and dispatched direct from a series of opera- tors’ keys and relays which will operate the transmitting apparatus out on Long Island. Messages from overseas will ultimately be received in the same manner, receipt and delivery of the actual messages being effect- ed by the customary messenger boy service direct to the home or office of the patron. It is expected eventually to install appa- ratus for high speed transmission and re- ception, photographic tape recording being used for the latter. This will be under the supervision of a trained staff of operators, along with which there will be the usual staff of expert Morse operators, who will work those circuits over which high speed transmissions is not taking place. Countless details of technical interest and engineering importance are embraced in the specifications for the station, due to the combined personnel of the Radio Cor- poration and the General Electric Com- pany, an arrangement made possible by the recent merger effected by these interests and the absorption of the Marconi Wire- less Telegraph Company of America.

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39 gb sf } L > es ts = Cape cya. ap = ai-' VER. meter men om ~ * 4€ POWER-HOUSE INTE 4 ia - V ( DWT t 4 Oats aE IZ \ =a _\\ cane RWOODEN TOWER: Bi) i! a’ oO f

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August, 1920 QsT Old ‘‘WCC,”’ Cape Cod By ‘‘An Old Timer’’ ANY will remember the low note of Marconi’s old South Wellfleet sta- tion which is now but history, the station having been torn down and nothing but the sands of Cape Cod remaining to tell of the radio days of the famous old station. The several photographs will give an idea of the station and the equipment of the times before the war. There were four wooden towers 200 feet high, set at the corners of a square about 300 feet on a side, with the power house and radio room in the center of the square. Instead of a ground a counterpoise of wires on poles about fifteen feet above the earth was used. Transmission was by Wheatstone tape or hand, at will. In the engine room was a 50 h. p. oil engine belted to a West- inghouse alternator, 60 cycles, 1100 volts, a small D. C. generator for excitation and to charge the storage battery; and the two transformers which stepped the voltage up to 22,000. An unusual feature of the sta- tion was that the key, instead of breaking the primary circuit, broke this high-tension the rent passed through two air-core chokes to circuit. From the transformers cur- the high tension room, then through oil chokes, to the automatic key, which had blowers to quench the are, thence to air chokes, and on to the condenser, gap, and oscillation transformer. There was a Western Union office at this station and the traffic was received in the day and punched on a tape, and at 9:30 P. M. we would start to send, stopping every fifteen minutes for five minutes. At the end of the schedule we would wait fif- teen minutes and then repeat until we had run the tape three times. When traffic was heavy it would take us until nearly day- light to finish. On a clear cold night the writer has heard the spark while walking on the beach five miles from the station. Farewell to old WCC is the wish of ONE OF ITS OLD MANAGERS. (In an early issue we will have a similar story on old SA of 1904, the early Naval station in Puerto Rico.—Ed.) Code Instruction Tables EVERAL of the Affiliated Clubs have asked for a wiring diagram for a good code-practice table. We present here a most ingenious and versatile hook-up, devised at one of the flying fields during the war and adopted as a standard at Air Service schools. In this circuit the buzzer or other source of musical frequency is permitted to oper- ate continuously, the keys controlling merely the connection to the head-sets. All the apparatus shown at the left-hand side of the diagram is located at the head of the table, where sits the instructor. C is a 1 mfd. paper condenser, for insulation purposes. R is an adjustable resistance for controlling the strength of the signals, and may consist of three 500-ohm carbon an 7 | 2 x 4 ARRANGEMENT OF WOER TABLE T/ON WIRING b SEC UR EACH s | ( elt i = «sezee| R ane | won ~Q/ mi ae “ D Secrien / WIRING DIAGRAM FOR COOL INSTRUCTION TABLE SMETION

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18 QST means for cutting out h S controls the con- bus lines, M is the nstructor’s head-set, and id battery for speech The remainder of the to sections, preferably three inches high, and s of apparatus for two facing each other and nterconnected. From er wire runs back to the and is connected to a vo switches, one X, a the other Z, a short- the rotary member of semi-circle of metal all the points when he switch Z is turned to these leads, switch S tructor may then trans- table by means of the the individual sections rcuit. Opening switch h S, the circuit is so two students in each inter-communication, e with other sections. inipulating the switch ay listen in on the work 1 correct errors or give r in his microphone, all the work of the other figure shows the wiring h section, and will be ly simple. ks excellently, and the ding inter-communica- groups of students with tion, as well as_ the of transmission by the whole table, can not be If desired, one or two tting units can be con- across the busses, tuned hes, and operated by ors This will give thru interference which value and will render a tation of the condition U0 meters on an average SOME CHARACTERISTICS OF THE UNDERGROUND SYSTEM round system for long wave optimum length wires, same signal strength as }0-foot antenna; while for ngths the signal strength is 1 f f the wave length, and it may August, 1920 be said that the shorter the wave length, the weaker the signal. This may be attrib- uted to the skin effect of radio frequency current with reference to the penetrating qualities of such current thru a partial con- ductor. For a wave length of 600 meters, the signal strength as received by the underground system, is approximately one- twelfth as strong as a signal received with the overhead antenna. For efficient recep- tion on short wave lengths, it requires an amplifier using three stages of radio-fre- quency, which gives a signal that is approx- imately of the same strength as that of a signal received on the overhead antenna unamplified. : ° ° “The underground system has excellent directional qualities. Using two wires in the direction of the transmitting station, the maximum signal is obtained; while using two wires which lie in a direction which is at right angles to the transmitting station, the minimum signa] is obtained, and in many cases is not heard. It is possible that the operator on watch can, at any time, ascertain the approximate direc- tion from which the signals are coming by means of using various combinations of wires. A good stand-by tune, by which the operator can hear all stations, is ob- tained by the use of two wires at right angles to each other, namely an east-and- north combination, and so on. ° . “It is very essential in this system that all wires be perfectly insulated; wires that are grounded bring in more strays altho when wires have been perfectly grounded, the stray ratio is still equal to and often better than that of the regular antenna. However, to obtain the best results from the system, the wires should be clear of all grounds. * * * “For short wave lengths it is highly essential that the optimum length of wire for each wave length be used. Altho by means of high amplification the proper signal strength may be obtained, for effi- cient results the optimum length should be used. ° ° ° ° ° “There is a tendency on the part of operators to disparage the ground wire system during the winter months when strays are at a minimum, because of the fact that the signals are so much weaker than they are on an antenna with the same degree of amplification, but during the summer months the ground wire system demonstrates its superiority. In the matter of eliminating interference from nearby stations it is, of course, always superior.” Abstracts from “The Use of Ground Wires at Remote Control Stations,” by A. Hoyt Taylor and A. Crossley, Proc. I. R. E., June, 1920.

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August, 1920

QsT 19 A New Type of Variable HE Connecticut Telephone & Electric Co. have produced a condenser which is entirely different from anything now on the market, both in design and in results obtained in operation. This is a very convenient instrument, being extremely compact, stable and free from mechanical fluctuations, of very low effective resistance, and simple in design. Figure 1 illustrates the construction, an exterior view of the condenser being shown elsewhere in this issue. It consists essentially of two plates, B and D. E is fixed, and not only forms one plate of the condenser, but at the same time is a support for the entire unit. The plate D is free to move to and from B. The surface of B is covered by a thin washer of mica C, and the plate D has secured to its under- ide a block of insulating material which supports the guide rod and the screw. This guide is slotted at either end and passes over pins. This latter arrangement pre- vents the plate D from rotating when the nut is serewed down upon the shaft. A spring placéd upon the screw operates to open the plates when the nut is unscrewed on the shaft. The variation of capacity, then, is obtained by merely screwing the nut upwards and downwards upon the shaft, which moves the plate D to and from B. The thread on this shaft is selected, however, so that the entire range of capa- city is secured by one turn of the nut, al- though the scale may be loosened and secured in some other preferred position. The outside dimensions of the Connecti- cut condenser are 2%” diameter and 1%” height to the dial, the required capacity being obtained within this small space by

the use of an extremely thin dielectric— a sheet of mica .0005” thick—for the upper values; while, on the other hand, the presence of the mica, when the plates are considerably separated, hardly affects the capacity, the air dielectric then being the main factor. The result is that this condenser has a very high capacity at the upper end of the scale, and a correspond- ingly low capacity at the lower end, the CAPACITY © PROCRO- PHCROTARAOS . D

<0 ‘oo 0 60 00 CONDENSF™ SCALE 360° Fig. 2 whole being distributed over a scale length of 360 degrees. Fig. 2 is a typical cali- bration curve, in which this effect is clear- ly shown. The presence of the mica becomes evident only at the upper end of the scale, the sharp upward bend of the curve being caused by it. At any adjustment capa- city is inversely propor- tional to M —+A, K where M is the thickness of the mica, K the dielec- tric constant of the mica, and A the distance from the outer surface of the mica to the movable plate.

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20 QST WALK ROLLER- AIR RADIOPHONE ( 1 genuine radio novelty t the famous seashore A BO resor , N. J. Great excite- nent recently when a roller ch ree passengers and a wir nd telegraph receiving appearance on the from the picture, the roughly enjoying this in- | by W. Harold Warren, demonstrated that it is wireless telephone and within a steel and con- th both inner and outer vith no external connec- eiving apparatus. This ikes it possible for a man a wheel chair on the \ rdwalk and at the same York office talk to him for his wife to get a land th the New York radio- say “Where are you, $; very compact and con- etector, and an amplifier. I the flat type and measures each side. The cross tecting frame are made of \4-inch thick by 1% or Each of the cross sup- ng. Commencing 3% enter, saw cuts %-inch both edges on each of vhich No. 26 §. C. C. wire making a double web. Li from the ends to the de- te No coils are used, tuning be hed solely with the vari- : There are 18 turns on é op and approximately 90 fer ised. This size of loop is r wave lengths from 300 good results have been velengths up to 800 meters. August, 1920 CLAPP-EASTHAM 1-2 KILO- WATT HYTONE TRANS- MITTING PANEL The demand for an amateur spark trans- mitting panel at a moderate price was taken into consideration when this set was de- signed. The instruments are mounted on a half- inch Bakelite panel 16” x24”. The panel is suitably engraved, and high tension bind- ing posts are mounted in the upper right hand corner for antenna and ground con- nection. The Hytone rotary quenched gap and motor are mounted on the front of the panel, as well as the knobs to change the coupling and primary turns of the oscilla- tion transformer. The Hytone gap has been redesigned and is of cast alumi- num, which provides a very attractive fin- ish when machined. In the rear of the panel are mounted the transformer, Dubilier mica condenser, and oscillation transformer. The oscillation transformer is constructed entirely of Bakelite and nickel-plated copper strip. Three are five turns in the primary and ten turns in the secondary. Adjust- ment of the secondary is provided fof by a clip. All connections are of copper braid, which provides against undue resistance and loss of efficiency. With an antenna of 10 ohms resistance, this set is said to be capable of over 5 amperes output.

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August, 1920 QST DE 0 RELAY LEAGUE The Ultimate Receptor T whae are too many thuminjigs, ding- whackers, and rettysnitches on a mod- ern amateur receiving set. With all the various features to adjust, it takes too much precious relay time to shift from one wave to another, however slightly removed, and again secure the optimum adjustment all around. On an average set there are at least four adjustments to be made, and there may be seven or eight. Too many. Life is fleeting and we need improvement to better present consumption of “man- hours-per-message”’, as our grouchy friend, The Old Man, puts it. Understand us, we do not wish for a minute to disparage the splendid tuned- plate-circuit regenerative tuners we have now. They are the best receiving sets we have ever had and our present good work is largely possible because of them. But can’t our manufacturers whittle down the number of necessary adjustments and re- tain the good features of selectivity and high regeneration and so increase their value in relay work? For a long time we’ve had in our mind’s eye a picture of this Ultimate Receptor. A compact cabinet; a pane] with just two large easy-turning knobs; one marked “Tuning” and arranged for calibration in wave lengths; the other to control “Regen- eration”. Wouldn’t it be a great time- saver! Why, it takes a man a season to learn how to get the most out of our pres- ent sets, and it takes an expert a half min- ute to make a shift of wave length and get all the variable elements in their opti- mum adjustment again. Consider the set we have in mind. One element would con- trol the tuning; properly tuned, there would remain only to adjust the regenera- tion to the critical value (We are sure the regenerative feature is vital and must never be dronped, and that it is not pos- sible to satisfactorily combine it with the frequency-adjusting member.) Now for the principles—what shall they be? There is the single-tuned-circuit arrangement, a relic of the single-slide tuner days, and those who worked with the small Western Electric telephone sets dur- ing the war know that they performed well. But they do not very well lend themselves to regeneration, nor do they seem selective enough. Mr. R. E. Thompson has recently patented a mono-control arrangement for commercial ranges which employs (with a crystal detector) a secondary inductance whose winding is so widely spaced that the distributed capacity is to all practical] in- tents nil. Such a circuit, then, should aét with true aperiodicity, make feasible a fixed coupling of such magnitude that the trans- fer of energy would be efficient and almost without reaction, and, it seems to us, should be capable of satisfactory regeneration when used with an audion detector—particularly since the range of wave lengths may be quite small. With the aerial circuit range adjustable by a variometer or series condenser, we would have it. Something along this line is needed. Can’t we have it, Mr. Manufacturer? The first man that comes along with it will gather in the berries. The Great American Noise-Maker URE, you guessed it—we mean the S spark coil, the poor, sadly abused squeak box. But if you think this is another knock at that long-suffering piece of equipment, you are wrong. We've been accused of that too often. A certain man who owns a spark coil because he can’t get alternating juice and who thinks we are unjustly hard on the coils, nearly beat us up recently over just that. It isn’t the coils themselves. They are perfectly respectable in proper hands, and although their potentialities in hands of other types give us the wooly willies we have all beheld the tragedy of a “rich” ham bursting into the game with a shiny new kilowatt transformer, and not a man of us but knows that he will cause X times as much clatter as any coi] set in existence, the factor X being a number with seven- teen more ciphers on it than our printer owns. This must be admitted in common jus- tice. It is because the coil is cheap and hence the starting equipment of so many

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beginne! ocation, the Nis trying these with time al stage” he d other see co-oT the | them a0." Where was that them heard was ! sna }uUS men then to idea Let have typi ine 7 per r A se! QST August, 1920 nightly a source of prov- has been brought into Very often when we sit le in the smother it is are mutilating the air and generally by the reaches the “transformer ressed to the point where se upon the rights of is that generally we the coilers make. tarted out these many ras engine coil, and he e, and he hadn’t heard amateur affairs, and w much racket he was ww just how the game to us, fellows, that con- ur proper attitude to- ng operators of spark particular lucky-piece watt, and go help your stick tuner and potato tter. He probably knows yu did when you’d been that long, and he is the which star A.R.R.L. tually made. Now that on and some of us DX to do, why not give ting these coil stations, , and help them to get it of their sets. That the coils to a good clear sharp tune, which will best range and yet mini- ince. 1 realized that if these rame only could hear the there would be more We know one city where le up a bunch of regenera- 1 audion panels and sold . very low figure—to the lt was almost miraculous. had reigned supreme, all | be. The beginners found men were willing to help ld hear what the older men tion entered too, and there emptation to pound the key something to listen to. idea. Take these coil r station, one at a time, set key, and tell them to go f the time they haven’t any are nightly up against but your set will show them. working somebody and then box start nearby with the »f superfious signals, adjust- or, useless talk at one word nd a wave as broad as Texas. opreciation will dawn on them. their right to the air is as inviolable as ours. The situation demands co-operation. “Tolerance”, as the Old Man says—tolerance, and education. Give the boxers a lift— it will pay. Club Affiliations VERY month sees an increase in the E number of stable organizations affili- ated with the A.R.R.L. In this way we are building up a fine structure that will stand the amateur in good stead when- ever any matter arises that requires con- certed effort for its conclusion. These are the live-wire clubs, the far- seeing clubs, who are interested in the handling of relay traffic and who perceive the value of organization for all things. Let us repeat that in affiliating with the A.R.R L. a society in nowise loses its inde- pendence or merges its identity. The A.R.R.L. does not seek that. Our sole aim is the creation of a complete fabric cover- ing the amateur world, whereby, through co-operative effort, we may always enjoy the pursuit of citizen radio, progress in knowledge, and increase the efficacy of our traffic handling. The bond is a moral one —as it properly should be. Clubs, if you think as the A.R.R.L. thinks on matters concerning the amateur, communicate with us on the subject of affiliation. Radio Jobs HE current issue of “Electrical Mer- T chandising”, a magazine devoted to the retail electrical supply trade, con- tains several articles pointing out to elec- trical jobbers and dealers the value of stocking a line of radio apparatus and cashing in on the ever-increasing demand for supplies and equipment. Most of these articles stress the importance of securing the services of a live young amateur to head the new department. The A.R.R.L. has them. It looks to us like there is going to be a good demand for radio salesmen with enough executive ability to take hold of such a proposition and make a go of it. He’ll have to be a business man, or he can get nowhere; and, just equally as import- ant, he must know his radio in order that he may give sound advice to customers. The peculiar combination of these two qualities is worth money in the radio busi- ness today, and we believe that those in- clined that way can with profit prepare themselves for some good positions in work that never grows uninteresting. CSI DYYPwwr'd ee

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August, 1920

The ODERATING DEPARTMENT ° J. O. SMITH Rockville Centre. L. I. TRAFFIC MANAGER

EPORTS from several of the Divis ions have not been received this month up to press-time. Although indications are that business there is much as usual and the failure to I r reports is probably due to the fact his is the height of the vacation sea- it is very desirable that we have ‘ounts of the divisional progress as usual. In the past month the effect of strays has felt to a considerably greater degre: in heretofore summer, and is re- this ted in the reports. At that, however, the volume of traffic handled seems to bs the neighborhood of fifty per cent. of he winter normal, and this is considered lendid showing in view of the fact that s; the first summer in which we have le a re determined effort to keep routes open and things moving With the é rience gained this summer, and the technical provements which will doubt < ur, we feel that there will never n be occasion for slackening relay ac ummer months. Traffi s being handled with absolut« east er territories where daylight routes ! n operat and the Traffic Manager wishes to again bring to the attention of the personnel the desirability of formulat with the stati n daylight range of each other. Sta- ng short-jump routes yns on owners who are persevering in their eration through these months are find- ng the game well worth while, with only th long distance stations cut off from em, and with the increasing perfection of our routes, the summer handling of traffic s gradually reaching the efficiency of vinter operation over the whole country Reports from the Division Manager follow: PACIFIC DIVISION A. E. Bessey, Manager The situation for the summer is pretty id, although we are keeping the routes pen much better than any other summer before. The Bay district is all going fine and the stations are getting tuned up in great shape, more amateurs than ever do- ng long distance work, even under the dverse condition of the summer QRN The routings through the north and south

QST

reliable through 6EJ, who is keep- ing his hands full handling the relay work. He certainly has a wonderful location, as he is still strong both are oniy north and south and is practically the only reliable ne ryoing route either way. At this particular time a good many of the stations are taking their vacations and there is not much work being done. There have been some tests made with 7CU, which worked very satis- factorily. We have a few new stations that are coming into prominence now. 6BJ of Burlington who is burning the air for fair, and promises to be a wonderful long listance station. He is heard in San Diego very QSA. The southern amateurs are heard here occasionally but are not at all reliable. 6AB of Healdsburg is doing nice work. 60H of Ukiah is also doing splen- did work His spark is heard all over. 1e Bay section hears 6JI very good but up to the present time have not heard of any one working him We have this month a report from A. E. Banks, 61Y, of San Diego, which we have long wanted as we have been unable to get any report from San Diego lately. The last month has witnessed an aggravating in- in QRN which together with QRM from an almost constant are and high pow- er spark has made long distance work diffi- crease cult. Communication has been carried on, however, with Los Angeles, Long Beach, Laguna Beach, and Del Mar, and a good number of messages have been relayed through stations 6JD, 6EM, 6SK, 6IF and 6MZ by our local operators. The follow- ng stations are using from one to two step amplifiers and are competent to handle traffic in San Diego: 6XZ, 6JI, 6TW, 61Z, 61IY, 6MZ While northern stations are very QSA at all times it has been difficult to get answers from them, the reason no doubt being local QRM. This has been the case particularly with the Los Angeles stations and it is understood that the interference in that city has increased to such an extent that traffic has been steadily interfered with. It is believed that if some earnest individual made a survey of some of the high powered spark stations as well as the are with a 200 meter wave meter he would be able to suggest grounding certain un-

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24 QST etc., which are caus- ns ng amateur circles. Ther n for such an abund- nless something such ar as | I 6E. rrove reports: A new men to the route here, 2 Mr. A ton, 6KM, who joined the A ving us a member in St capable spark. 6GR of § eca successful in long onth, clearing TCU 6EJ and 6AK are clear and south including Fres1 \ll local routes in 6] reports route open to 1 s worked many of the B s. The boys in Santa Cru ng nicely equipped and W »b for relay work. A. L. M inds, Calif., is just se- nse and we feel sure the southern route ( ible to work through ve n old timer and a com- he will have no diffi- I t wave of club organiza- time which we feel y interesting for win- ter Clubs seem very favor- ¢ with the ARRL and banded together and common interest be- ive better co-operation GULF DIVISION Corlett, Manager R throughout this division, rk is concerned, seem to 1 standstill. Old Man Stat n the job with both feet and a brick or two on his key t that we don’t handle any- D rintendent White of North- rt lley of Southern Texas have ring to work out a day- Trunk Line “F” in order summer; some tests were rul tions were that it would be tter to handle traffic with ease | tions IN LINE COULD BE DEP! PON TO BE ON THE JOB ON Dis ntendent White, of North- ern 7 rict is spending his honey- moo! » but sends in a brief re- port ects to be back in Texas hort] tes correspondence from pros} ll as station owners. Ad- ire District Headquarters, Box 322 He reports some ten tat construction in the upper Panh Texas. These stations will August, 1920 help us on our swing westward next winter. Why not get lined up for some day-light tests NOW, as soon as the stations are ready, and see if we can’t work WEST this Summer? Assistant District Superintend- ent Martin, of Amarillo, is doing some good work along the organization line, a club is being organized in Amarillo and it really seems that our dreams of an ama- teur radio station in the Texas Panhandle to help bridge some long jumps west will soon be a reality. The Waco Hertzian Society has secured permanent meeting places at Hills Business College, and a club station will be erected there. In a recent parade in Waco the A. R. R. L. as well as the Waco Club was represented by an elaborately decorated automobile which created much interest amog the spectators. District Superintendent Tilley, of Southern Texas District, has a rather mea- ger report to make. Radio in his district is about dead for the Summer it seems. A number of stations are taking advantage of the lull and are putting their stations up in first class condition. Tilley, 5ZU, is re- building his antenna system, putting in 70° masts; other improvements are a quenched gap, regenerative receiver, and an elaborate ground system. You fellows with good stations in Southern Texas get in touch with Tilley and let’s see if a day- light schedule can not be arranged. District Superintendent of New Mexico, Louis Falconi, is evidently so busy getting all fixed up for the coming season that we very seldom hear from him by mail and of course the jump is entirely too long to hear from him by radio- We understand that all that good receiving work he was doing last winter was on a straight loose- coupler and a couple of “lamps” and that he is now putting in a regenerative receiv- er and all the fixings. We wonder what he will do this winter. Let us hear from you, Falconi. No further developments in the Okla- homa District as yet. ATLANTIC DIVISION Chas. A. Service, Jr., Manager Hot weather has brought most of the relay work to a standstill in this Division with the exception of daylight routes in operation between some of the larger cities. QRWN is so intense most of the time that there is ao chance of getting MSG traffic through except by the short jump method, although DX stations may be heard and worked on the few favorable nights with surprising ease, considering the time of year. The Bureau of Standards QSS tests con- tinue to hold the interest of the amateurs and by the time this report is published the A.R.R.L. Division tests of a similar nature unclinresene ae

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August, 1920 wil] be in full swing and, it is hoped, will be as successful. The Division Manager urges all amateurs capable of receiving these tests regularly to send in results as requested in the June and July issues of QST. We note that the Navy Department is taking a greater interest in amateurs as indicated by the QST’s which the various Navy Stations are sending for the benefit of the amateurs in New York, Philadelphia, the West Coast and elsewhere. The Navy realizes there is undoubtedly a good field for recruiting radio operators in this way and at the same time, to promote friendly feeling on both sides and a consequent cut- ting down of amateur QRM on the higher tunes. The Division Manager has an accurately calibrated receiving set and has made measurements of local and long distance amateurs in his Division during the spring and early summer months and has found there is a universal tendency everywhere to cut down wave length within legal lim- its, and to pay some attention to decrement. This may be attributed to several causes: 1. The higher degree of skill and tech- nical knowledge of the general amateur world. 2- The use of wave meters and the in- fluence of A.R.R.L. and local associations’ propaganda and assistance to junior mem- bers. 3. The knowledge that long distance work can be done on 200 meters with proper adjustments of transmitters and the use of amplifiers at receiving stations. This is fine business and should be con- tinued. Reports from different sections of the Division are as follows: Mr. Hornung, District Superintendent for New York, reports that the Y. M- C. A. Radio Club has been keeping a continuous watch and has been copying the QSS sig- nals sent by the Bureau of Standards. New life has been injected into the Y- M. C. A. Radio Club. They are now printing a two- page semi-monthly bulletin called the Loud Speaker. In addition to this, they also have formed a free code and theory class for club members. Clubs throughout the coun- try should take this movement up and hélp the ARRL by becoming affiliated. Traf- fic in and around New York has been pretty dull, due to excessive QRM and QRN. Mr. Goette, District Superintendent for Brooklyn also reports that traffic has fal- len off due to the coming sQmmer season; very little western traffic is coming through. It is impossible, due to heavy static, to work any distant 3rd or 8th dis- strict stations. The Radio Traffic Association of Brook- lyn closed their last meeting of the season with a membership just falling short a QsT 25 trifle under one hundred members. The first meeting of next season will be held in October. According to advice received from the Bureau of Stndards, the fading tests, so far, have been very successful. These tests are now known throughout this dis- trict and very little interference is being experienced from stations other than the official transmitters. As yet, Station 9LC has not been heard but the others have been coming through very good. Mr. Spangenberg reports very little traf- fic in Northern New Jersey. 2QR (Robinson Bros. of Keyport, N. J.,) has just been assigned to the traffic depart- ment of the ARRL. Mr. Frye has just appointed Mr. H. J. Hemphill 3DT as an officia] ARRL station in Atlantic City. A peculiar condition exists between cer- tain shore stations in Atlantic City and vicinity, it being possible to get daylight signals from stations on Long Island and New York vicinity. This is very encour- aging and may result in a daylight route from New York to Philadelphia and vicin- ity. With the help of Mr. Smith (2ZL) and several others, a series of tests will be arranged in view of completing this route. A series of tests have been carried on between Mr. R. C. Ehrhardt (8CE) near Scranton, Pa., and the station of the Dis- trict Superintendent in an endeavor to con- nect Scranton with Philadelphia and vicin- ity. It is hoped that such a connection will be made in the near future although very little consistent traffic work has been done to date. Stations which deserve the credit for having carried on the bulk of the traffic during the past month are: 3EH, 3MU, 38BA, 3FB, 3DT, 3NB. The District Superintendent is pleased to report that the amateurs in this district have uniformly observed the request of Bureau of Standards to stand by during test hours. Very successful recording work is being done by the recording stations in this district. The spirit shown has been of the best and every station stands ready to do anything that will be of aid in bringing these tests to a successful conclusion. The non-delivery of certain traffic has been called to the attention of the Dis- trict Superintendent. Such cases were re- ported as long as three or four months ago. Test messages were sent and but 30 per cent. of this traffic ever reached its desti- nation. The points of non-delivery were Philadelphia and New York City, chiefly the latter. The conditions in Philadelphia have been improved and the cause of non- delivery traced. But delivery in New York City has proven uncertain and unreliable. This is no doubt the fault of the smaller stations to whose hands the traffic was en- trusted. Care has been taken to forward

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26 QsT and reliable stations | addresses have been re- traffic in that peated th care, but the results have be ter. I believe this matter shou t up in meetings of local Radio ¢ the importance of deliv- ery it n the members, especially the o e SMALLER STATIONS who, s, are asked to assume the respor delivery. It is fine work to tral sages hundreds of miles and a ill kinds of DX work but the litt who delivers the message deser CREDIT in my estima- tio: the credit he rightly de- serves with some encouragement and ps coming winter will see more 1 h its final resting place, espe arger cities. The iperintendent for Eastern Pennsy s the following to report: Conditio: Trunk Lines and Branch Lines In | ern Pennsylvania District: (a) ne B—Northern route, no statio1 en found to replace 3GX in Re The Pottsville station is not yet n. (} ne B—Southern route. No f ress (c) ne D—Stations 3DH and SEE, 1 ting links to the northward on this ve not been active recently, and tr New York has been handled by lor Southward, satisfactory comn with 3BE has been estab- lished ZA station; 3BE has, as far outlet to the south. (d) Line No- 1. Station 8CE at Ser been very active, and has succes lling some traffic through 3NB y provide a temporary met} ting traffic to the northeast part vania, until the shorter jum] rking order. Conditi Around Philadelphia: 32 s recently been put in full com | has handled considerable traffi adelphia by means of long ju The Superintendent for Central Pen: eports that— ( n the Central Pennsylvania Distr not changed to any extent since report was made. Efforts to lo y stations between Milton and Pitts! e so far failed. No reply has be« ved, to date, from the radio club irg concerning prospective relay it that point. On the fact that the location, whi rented in order to get this sta- tion ir ) at once, was sold and that reed to vacate, station 8BQ is ou mission again as far as his 1 k neerned. The power service is ve and does not allow the use of this tter However, he has in- August, 1920 stalled an Amrad 100 watt transmitter for the present with which it is expected to reach Danville, who can connect up with Pottsville when required. This will pro- vide an excellent chance to test the pos- sibility and worth of ‘short jumps on low power’, which is very strongly in favor. Plans are being made to have a permanent and efficient station in operation by fall, if not sooner, in order to connect up with Pittsburgh, providing this long jump is necessary. We hear from Mr. Devinney, Superin- tendent for Western Pennsylvania, that re- lay work in this district has fallen off about fifty per cent. in the last month, due most- ly to warm weather and some very bad storms. The number of messages handled will run in the neighborhood of 300. The chief interest just now seems to lie in fixing the sets up for next fall and ex- perimenting with the CW which, he be- lieves, will be the only thing as soon as the bulb situation gets straightened out- Line up of Branch Line No. 2: Uniontown, R. M. Sincock, J. McKin- ley, 8MT. Pittsburg, B. P. Williams, 8EN. Pittsburg, R. M. Carson, 8RQ. Pittsburg, Wm. H. Raring, 8LH. Monaca, J- E. Ahrend, 8DV. New Castle, R. J: McConnell, 8ADF. Greenville, P. A. Riley, 8CH. Meadville, V. L. Wise, 8GN (out for the summer). Cambridge Springs, D. M. Lord, 8WY Erie, The Summit Radio Club, 8UG. There is a station at Washington, Pa., located in the High School that has been handling all messages in that locality but they change operators every term as the set belongs to the High School and of course the operators come and go, and on that account they have been left out. Mr. Devinney’s appointment of Burton P. Williams, 3220 Orleans Avenue, Pitts- burg, as his traffic assistant has been ap- proved. The District Superintendent for Mary- land reports that radio is very dull in his vicinity with the exception of the QSS tests, which have been recorded regularly by a number of Baltimore stations. 9LC is the only station which has not been heard so far- It is interesting to note that re- sults of Baltimore stations have so far checked with Washington stations, 40 miles away, while stations in Philadelphia get different curves than 3NB of Vineland, 45 miles away. Stations in and around Baltimore have tried to connect with Phildelphia during June, but so far 3HG@ has been the only one to reach Philadelphia (3HJ) and work for any length of time. 3NB is received QSA in Baltimore and if the next season finds it impossible for Philadelphia stations — = oe — 0

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La August, 1920 to work Baltimore direct, this may be used as an alternate route. No report has been received from the District Superintendent of Delaware. Philadelphia and Wilmington are in com- munication day and night and there is little delay in the exchange of traffic. Unfortu- nately there is no southern outlet for Wil- mington. ONTARIO DIVISION A. H. K. Russell, Manager The past month has been bad for wire- less relay work in this division. The heat has got in its deadly work and amateurs have been spending little time at their apparatus in consequence. The Wireless Association of Ontario re- cently received a communication from the Naval Department of Canada, which has control of all radio matters, to the effect that the tests conducted throughout the winter of last year with a view to allowing an increase of wavelength to amateurs had proved unfavorable. In consequence for the present the fifty meter restriction stands for Canadian amateurs. The Depart- ment adds, however, that they do not re- gard these tests as final and will conduct more with the closing of navigation this coming fall. This decision of the Naval Department emphasizes what has been preached by all the leading amateurs in this Division, i.e., that C.W- transmission is the only solution for the amateur in Ontario, compelled to work on so short a wave. Considerable progress has been made by several experimenters in Toronto during the last few months in the development of C.W. transmission sets for amateur work, and it is almost certain that by the fall there will be several medium powered C.W. transmitters in operation in Toronto and vicinity, with prospects of a larger station being operated as well. In any case there is not the slightest doubt but that com- munication will be easily maintained by C. W. with the “8” stations to the south and west of us NORTHWESTERN DIVISION Royal Mumford, Acting Manger Vancouver, Wash. The long dreaded summer season of static and high tension induction now drowns out the distant stations and handicaps our work with those near by. Yet we con- tinue to battle with these unfavorable con- ditions for the supremacy of the air. It is hard to listen to static that drowns out everything for hours at a time. But all things come to him who waits. Occasion- ally signals do manage to break through. Here, “sixes” as far south as San Diego are picked once in a while when static relaxes QSsT 27 its intensity. And “sevens” are heard at least as far south as Los Angeles. Right here it may not be out of place to mention a little observation on my part regarding static and LD signals. If you listen in closely just before dark you hear little static and signals—well just wait for them. Often the LD start coming in fine as early as 7 o’clock. They usually make themselves heard sometime between 7 and 9. A minute after you hear one, they are coming in by the dozens. The best part of it is that static usually waits until after the LD signals have been traveling great for about half an hour or more!! Here we have a good half hour of LD opportunities, but everybody is hamming around locally, and the business stays on the hook. Now why can’t we give up a little of our local conversation and take advantage of our LD Opportunities? This 2:30 A. M. stunt is all right but why not snap out of it, as some are doing, and clear our business ahead of the static? We can’t do this every night of course. The static isn’t always so accommodating, and LD doesn’t always come in so well, but if we all watch and take advantage of conditions when possible, it will help out wonderfully. Relay traffic north and south keeps mov- ing, often slow to be sure, but persever- ance always wins. Stick-to-it-iveness has been developed to the n’th degre¢. The relayers who put traffic through these days deserve al] the more credit for their ser- vice in spite of present handicaps. On the whole relay work has actually been in- creasing during the last month. In Seattle 7AD, 7BK, and 7AN are evidently deter- mined to stick to the job all summer. In Tacoma 7BC has recently connected south direct. However, 7CE handles most of the traffic. Here we have also 7CF whose spark is easy to read through static. At Vancou- ver, Wash., 7CU has handled over 80 messages during the past month In Portland considerable interest has been shown in relay work lately, in spite of the poor radio weather. 7CR and 7BP are on the job nearly every night and work north and south consistently. Most of the traffic south now goes through Ukiah, Cali- fornia. TED and 7DS are doing nearly as good work and may be depended on to give better account of themselves when condi- tions become more favorable. One com- mendable feature of Portland is the abso- lute control of spark coil amateurs by the Northwestern Radio Association of that city. Mr. White in charge of the work re- ports that the city is divided up into a number of districts over each one of which an assistant is put in charge. It is up to this assistant to run down every spark coil in his territory and pay each offender a personal visit. The youngsters are fast be- coming well informed regarding the Gov-

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QsT Laws and _ regulations. they are invited to at- of the N.R.A. At these given opportunity to t radio as they are wil- This practice not only violations from the also interests all ama- e work: rest is shown in the tations to the east, but eastern part of the di- bly scattering. The on of the country mps of 50 or 100 miles to cover as 500. Dis- ressed by a number of this locality in their work outside of town. hope is expressed that line up something, so r stations can be made is exactly what we are se fellows. A number going up, and old sta- proved. Next winter ented activity in Mon- Box 663, Bozeman, n appointed District Montana. He reports n the state is almost at amateurs have closed iccount of static and opening weather he job, and ready to get rignt way. ngineering department tate College, Bozeman, rganizing Radio Clubs gh Schools all over the 7XB has been transmit- nd giving code practice rs. We will learn the rts as soon as things re-, 70W continues work- th with ease. Mr. De- pointed District Superin- tate of Oregon and will next month. 7CC, has been appointed tendent, Moscow, Idaho. ina, Idaho, has been ap- Superintendent for South- will be glad to have their issue. en, 7EV, Assistant Divis- ) South 10th Street, Ta- rts an attempt was made route “A” but due to lack ting this summer, work has ntil the fall season opens tal CW has taken quite a ind Seattle. With a single n of speech has been heard \ recent addition to the August, 1920 radio field is BF1 with a powerful CW set. He claims he is 80 miles south of Tacoma (?) but is too bashful to give his name or whereabouts. Recent tests from Tacoma to San Fran- cisco Bay stations reveal the fact that QRN is still going on and we take our hat off to the “ops” who have the patience and perseverance to put a message through during these times. Up to date 250 mes- sages have been handled through Tacoma for all points. Communication south is usually effected through 7CU, Vancouver; 7CR, Portland; and 7CW, Silverton, Ore. 7TYS is still reaching the 6th district sta- tions and Rev- Ruth is to be commended on the efficiency of his set. TCE was ap- pointed traffic clearing station in Tacoma. Route all messages south via 7CE. This will insure better results in clearing up traffic. Puget Sound Navy Radio puts out a bulletin for amateurs and can be secured gratis by writing to District Communica- tion Superintendent, Navy Yard, Bremer- ton, Wash. ROANOKE DIVISION W. T. Gravely, Manager Although the hot weather and static are now bearing down on us with fury, the sta- tions in this Division continue to operate nightly, with a fair degree of success. It is really remarkable how signals are hold- ing up through the heated term, and it is to be hoped that these conditions may last all through the summer months. Of special interest in this Division are the Fading Tests which are being conduct- ed for the Bureau of Standards, and I feel sure that when the data has all been col- lected it will afford material for reflection for days to come. The A. R. R. L. has a formidable task before it in the QSS Tests, which are be- ing held during July and August, but with the consistent co-operation of the amateurs throughout the entire country much valu- able data will be available and well worth the time and energy expended. Outside of the Seaboard District (East- ern Virginia), the Division remains unor- ganized, but tremendous efforts are being made to effect well defined lines, and to create new stations where they are most needed. It is a long weary road to travel, and will necessitate lots of hard work, but we will eventually be there. I would like to hear from one or two stations in Eastern North Carolina, who will undertake the organization of that Dis- trict, and who will co-operate with the other District Superintendents in forming lines. You Eastern Carolina fellows come on and help out. Let’s hear from you immediately. I will also ask that the stations in South- wt entrar

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August, 1920 ern West Virginia communicate with Mr- Jno. F. Wohlford, and let him know that he may count @n their co-operation in the formation of lines through West Virginia, in conjunction with Mr. A. G. Heck, the District Superintendent for Northern West Virginia. It is very gratifying to note the increased activity in the Northwest Vir- ginia District. Mr. Wohlford has rendered me a detailed report on the progress he is making in lining up prospects in various points where stations will count in our routes, and I extend him my thanks for his splendid efforts. 3HO, Blair, writes that he has to dis- mantle his set, but expects to operate the High School station in Richmeonl (3U";, so the League will still hav a station there to count on. Reports have reached me to the effect that a 1 K. W. station is teine erected by the Lynchburg Cotton Mills at Lynchburg, Va., and a similar station at Greensboro, N. C. for the private use of the Company, but efforts will be made, on my part, to have the operators co-operate with the ARRL, and assist in the relay work. (Lynch- burg please take notice). Mr. J. R. Wikle, formerly 4DM of Atlanta, Ga-, is doing the -onstruction. L. C. Herndon, Superintendent for East- ern Virginia, reports that so far, no new stations have been located in the Eastern Division, but there are hopes that sooner or later a station will be opened in Fred- ericksburg and one in Petersburg, in which ease there is no doubt that daylight com- munication between Norfolk and Richmond is assured The problem of decreasing the interfer- ence from the local Navy Station, NAM is being handled through official channels and it is honed that in the near future the ‘tation will be retuned and the decrement lowered. There are also several commer- cia] stations under construction or being planned along the Atlantic Coast, and as soon as these are opened the biggest part of commercial traffic will be nandled through these stations, thereby greatly de- creasing the amount of business NAM will have to handle. This will be of inesti- mable benefit to local relay stations. All of the relay stations in this vicinity are equipped with amplifiers and regenera- tive receivers, and are getting excellent re- sults, long distance amateurs coming in steadily, and as soon as our transmitters are gotten into shape, it will be hard to find a series of more efficient stations. The Norfolk Police Dept. has installed a .6 Telefunken transmitter (Call 3ZC) ani the Norfolk Radio school a 1 k. w. Independent set (Call 3YD). The latter station is accessible to the Hampton Roads Radio Association, and although no long distance relaying has as yet been done by these sta- QSsT 29 tions, it is hoped that shortly they will be added to the list of efficient relay stations in the vicinity of Hampton Roads. T. C. White, City Manager for Norfolk, advises there is but little to report this month due largely to the adverse weather we have been having in this district; also on account of two of the best stations, 3HO and 3FG, having had transformer trouble. Station 3EN has been busy Tuesday, Thursday and Saturday evenings with the Bureau of Standards QSS tests and aside from that, has handled several relay mes- sages to distant points, longest distance be- ing 1HAA, Mr. Vermilya at Marion, Mass., who said 3EN QSA very- Worked NSF several times, he using phone and CW both. We are very anxious to have Mr. Blair, 3HO, of Richmond, Va., hurry the instal- lation of his equipment in order that a possible connection in daylight may be made. It is believed with his station in good working order, that we can connect with his station, he in turn with 4CC, and then on down the line. North of us there are no stations nearer than Washington, D. C., and it is exceedingly difficult to work those stations at night, much less in daylight, and we would like very much to hear of any stations intermediate in order that daylight communication may be es- tablished North of here. CENTRAL DIVISION R. H. G. Mathews, Manager During the past month traffic work has been carried on with fair satisfaction con- sidering the handicaps of static and poor transmission due to the summer weather. No difficulty has been experienced in hand- ling messages between Chicago and the East and especially good work has been done by the Ohio stations. Transmission has been very indifferent South and West although fair results have been obtained on Northbound messages due to the operation of the Shore route of Mr. Burhop. Interest has been aroused in the fading tests being held by the Bureau of Stand- ards and those proposed by the League and it is hoped that these tests will have the effect of reviving some of the missing in- terest in the southern and western parts of the Division. Plans are on foot for a Central Division Convention to be held in Chicago the first week of September, this convention being open to all radio men in the Division and to include the usual banquet and meetings as well as individual good times. Mention of this Convention is made elsewhere in this issue. The Chicago Executive Council has pro- posed and put into effect traffic rules gov- erning local and long distance work in Chi- cago and accordingly the Division Manager wishes to notify all stations outside of Chi-

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30 QsT August, 1920 cago | is not open for long Between June 11th and 20th, over 125 mes- distar r to 9:00 P. M. Cen- sages were handled between the Cadet En- tral St r 10:00 P. M. Chicago campment at Valley and tao Omaha sta- daylight The only exceptions tions. The station at Valley was installed to this 1 special tests and mes- for the purpose by the Assistant District sages irgency, in which case Superintendent, Mr. Fred Bullis. 9SC and per? en for operation prior Fort Omaha WII handled the Omaha end. to th Chicago City Manager. Several radiophone tests have been con- By elit . distance work prior to ducted by Mr. O’Rourke and he takes great the set rrespondingly limiting pleasure in reporting that he has been local v time it is believed that heard by 9AFX while transmitting on one better in be secured between Western Electric tube. 9AFX is 96 miles the loca listance stations of the from Omaha. city n Manager requests the Mr. H. L. Owens, District Superintend- co-op r long distance stations ent, Eastern Kansas, reports that he is im t! ntaining this rule. It working under difficulties trying to estab- is re sages for Chicago or lish day light routes east through his state. for r Chicago be held until However, he expects to have one open 9:00 P lime and that in_ order through 9RY of Topeka in the near future. to furt of the Chicago Execu- He has several excellent routes through tive | empts be made to for- 5BT of Blackwell, Okla., and west through ward earlier unless these 9gNX or 9BW of Wichita and 9AEG of El- mess reme urgency. : dorado, thence to 9LR of Anthony. They Be pressure of other busi- are all good for relay work at nearly any ness M Duerk, District Superin- hour during the day. 9LR of Anthony, tendent n Ohio, has been forced Kansas, is going to be a strong number in to su ties during the sum- relay work this coming season. His signals mer! nd Mrs. Charles Cand- are very QSA here on a short wave regene- ler of e been doing such ex- rative set using only one bulb. celles unofficially, have been = Q. M. Shultise of Wichita (9NX), ad- oe NEnOS. 2 ro holdit S__vises that he will not be with us this coming for W no es coc ele 4 season. We regret this very much as he ~ “ J oT pega — his was prominent in relay circles. Robt. Pir- D “ie nd Bh ve Candler i tle, 9SZ of Council Grove will soon have app! and irs. Candler for his station in operation and will work alter- their eration during the past nate to 9EL “ o. or their rine Maa J. A. Wanek, District Superintendent, —— es ay vee Western Nebraska, reports that there are VEST DIVISION Benson, Manager \ fic has been handled in th t month due to the fact that Q terrific. Several early mor’ tried out with little suc- J. ¢ District Superintendent East reports that at last in- ter tters and particularly in our A erinning to revive in his distr rather slow revival at pres- tate traffic routes will begi! permanent shape. Mr. Kar! ' *’ 9AFX, Stromberg, de- ser Hardly a morning pas \FX on the job. He is takir rest in the counties sur- rou! tion Mr. Parmele, of Platt | improving the efficiency of h by next month will prove i val » the district. Effi tations are operating in th ns: Wahoo, Norfolk, Way! nd. According to recent report \. R. R. L. man of Colo- rado n Omaha. Mr. E. Ander- son st coming to the front. very few good stations in his territory and has very little grounds to work on at pres- ent. However, a contemplated rearrange- ment of the division line through the state of Nebraska will give him more territory, and a few good stations. He is lining up several good routes west and expects to have them perfect in the near future. P. A. Stover, District Superintendent, Iowa, is still working hard with his CW modulated and is reported as being heard QSA at exceptionally long distances. He reports his territory a trifle dull at present due to so many of the best relay men being on their summer vacation. Mr. Stover is very busy himself but expects to devote more time to A. R. R. L. matters in Fall. G. S$. Turner, District Superintendent, Western Missouri, is spending his vacation in Chicago and will be unable to give his report this month. He states, however, that things are going along nicely and that he will have one big report for next issue. J. A. Fritz, District Superintendent, Eastern Missouri, reports that he is still busy trying to establish an efficient day- light route to Kansas City. He has located a good station in Jefferson City and is also (Concluded on page 382) —_ “ — « nl

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August, 1920 WM. E. WOODS We take pleasure in presenting the own- er of 9LC, commonly known in amateur circles as “Bill” Woods, age 26, of St. Louis. We cannot improve on Mr. Woods’ own account of his experiences, so present the whole works: Started wireless as hobby at age of 14, while in short trousers. Purchased com- plete outfit from w.k. New York mail-order firm at $11.50 per outfit. Erected aerial which was humdinger, but after listening to various sounds for three weeks with aid of the 75-ohm receiver decided to follow other pursuits and sold outfit to guy next door for $4.50. After thinking over deal, decided to again embark, which did, this at cost of $15. New apparatus was main- ly electrolytic interrupter; immediately burned out house meter and three chande- liers of apartment above us at total cost of $35 to male parent. These marvelous results firmly imbedded idea in my mind H. J. BURHOP. The above is the best picture we could get of Mr- Burhop of 9ZL, Manitowoc, Wis- consin, and we think his call letters will be sufficient introduction. Mr. Burhop was born at Sheboygan, Wisconsin, in 1889, and jumped into the radio game with both feet in 1913. As evi- dece of the fact that his jumping was effective, we have the fact that he had a 1 k.w. station with the call of 9RW in 1915 with which he did some good long distance work, for those times. He went into the service in 1916, and after a year of com- mercial work joined the Navy at the out- break of the War, naturally getting into the radio service. He was stationed at various land stations on the Great Lakes, as well as helping beat the kaiser on the U. S. S. Gopher, which the inhabitants of Chicago will remember as the super-dread- naught which protected them from the vicious onslaughts of the Hun.

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QsT 32 E. WOODS that teresting study but nee nt before becoming pra d laboratory in back yar 11 shed; purchased % former and, after bun school for most of wil in working Ra- cine. W le tuner and ga- lena letter from Ra- cine elous fact and on stré ed father that was a oe ve % k.w. at once. Insta for convenience’s sake f going through back yard through the snow. First rations, mother and fath noted very queer ef- fe f various rooms and firn ve back to “labora- tory le speed. This was dor ng distance at once, wil Been at it ever since aga le family and neigh- bo tion by reading ra- dio till have first little bl om which I gained m [ give the following is- su what I know to- da begun to teach 2- yea ile wife and small dat itmost disgust. Now hav und dollars invested in ra 1 on the look-out for somet!] nning on a “real set” thi ve done twelve times pre t stuff, and I’ll sit up until ANY good night to prove OP NG DEPARTMENT from page 30) re f the Jefferson City Rad ed in the A. R. R. L. and t filiate with us soon. The nager requests all sta- tions half of Iowa, Kansas and Ni re interested in relay wo munication with him at on VRENCE DIVISION Lorimer, Manager A ft rable report last month the k is specially encourag- ing. W coming through now over t ites. Both routes are over f s, perhaps a little too long f er work; nevertheless traffic ting through with fair regula 3Z, | Que., has been working iFV Me., quite consistently and aff outlet to the New Eng- land D has also been QSO with 1HAA Mass.). August, 1920 H. J. BURHOP Burhop was released from the Navy along with the rest of us and for a time did telegraphing out in Iowa but re-enlisted on condition that he should be stationed at Manitowoc where he could carry on his work as District Superintendent of Wis- consin, which appointment he has held since 1916. He was not satisfied with the amount of traffic at NTY and so he erected 9ZL at Manitowoc on February Ist and has been running 9ZN a good race ever since. Burhop’s specialty is summer daylight communication and the operation of his Lake Shore Route shows what he is doing long these lines. The Division Manager, from 2BF, has been getting some traffic through via 8BB at Plattsburg, N. Y., and also handled a few direct to 2TF, Schenectady, N. Y. An old time Montreal Amateur, Mr. Gladden, has opened up a fine station at Ottawa, Ont., call letters 3GT, giving us an outlet to the Capital City and one leg of the Montreal-Toronto route covered. DAKOTA DIVISION R. H. Pray, Manager There is very little being done in the re- lay field at present due to the excessive amount of electrical storms and the fact that many stations are out of commission for reconstruction. Mr. Boyd Phelps, Traffic Manager of the Minnesota Wireless Association has been appointed assistant to the Division Manager under the title of “Supervisor of Summer Relay in the Dakota Division”, term to ex- pire October 15th. It is generally acknowl- edged that it is always difficult to reach the Twin Cities and his special commission is to establish routes in all directions in re- liable relaying distances. Everyone is asked to co-operate with him as far as pos- sible He can be reached by mail in care of the Minnesota Wireless Association, 416 Court House, Minneapolis, or by radio, 9ZT. Mr. James Schultz, who has been Super- intendent of the Southern Minnesota Dis- trict, has resigned because of lack of time to look after ARRL matters properly, and Mr. Phelps will for the present assume the duties of District Superintendent in addi- tion to his own. Mr. J. A. Gjelhaug, 9ZC, Northern Min- nesota District Superintendent, reported some correspondence with H. Clark of the Manitoba University, Winnipeg, and that Mr. Clark is getting a regenerative receiver and will soon be in the relay game.

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August, 1920 QST’S DIRECTORY OF CALLS G. A. F. Werner A. A. Stockellburg Wm. E. A. Dodge S. M. Zartarian Saymond Sorenson Samuel S. Frizzell Allan C. Lawson J. H. Washburn, Jr. E. L. Shepard Jerome Richardson W. H. Cook Bert J. Atwell H. W. Castner John R. Walker John Hardy Sands A. DenFish L. A. Morrow Wilbur S. Wellington H. B. Prescott R. McK. Strickland F. X. LaFrance L. W. Sayward >. M. Goddard Wm. Rosenbloom A. A. LeMay Harold Cohn Fred Clayton A. 8. Brower H. D. Schedler Frederick A. Girard R. W. Freure F. McCartin, Jr. V. H. Schmitt W. S. Blanchard Harold Peiler Jos. Pignone H. L. Stanley W. E. Murray Chas. lL Hertz N. S. Conover Cc. V. Macpherson R. V. D. Gedney F. Frimerman Wilbur Clark H. L. Strang Milton Bergey Leonard S. Wall J. E. Krone Merritt E. Gregory Walter L. Henry J. D. Simpson, Jr. Robt. E. Linthicum Harold Nielsen, Jr. Walter Rau Frank Olson Jay V. Hoyt Howard S. Frazier N. Hamilton H. R. Martin Winford W. Brown Samuel Mishler Maurice D. Clark W. E. Wood Don W. Moore Wm. A. Marsh Lloyd B. Quinby Chas. B. Galloway Frank M. Corlett Clyde B. Mosteller Holmes Richter T. B. Ancell Marion Apple Arthur H. Holt M. B. Patterson Ernest Albert Rodenhouse Earl Sellers James F. Burnes QsT FIRST DISTRICT 12 Pratt St., Allston, Mass. 54 Hano St., Allston, Mass. 25 Sargeant Ave., Beverly, Mass. 211 Fayerweather St., Cambridge (Correction) 340 Beechwood Ave., Bridgeport, Conn. Washington St., Duxbury, Mass. 10 Dikeman St., Waterbury, Conn. 9 Wesley St., Somerville, Mass. 76 Pine St., Bath, Me. County Road, Ipswich, Mass. 184 Main St., Pittsfield, Maine 25 Poltoma St., Pittsfield, Me. 441 Congress St., Portland, Me. 140 Water St., Guilford, Mass. Foster St., Littleton, Mass. 113 High St., Mystic, Conn. 104 Charles River Road, Cambridge, Mass. 15 Lunda St., Waltham, Mass. 110 Crescent St., Portsmouth, N. H. 384 Orchard St., New Haven, Conn. 93 Warren Ave., Pawtucket, R. L 87 Hamden Circle, Wollaston, Mass. 17 Constance St., Maplewood, Mass. 108 Thornton St., Revere, Mass. SECOND DISTRICT 1117 Hutton St., Troy, N. Y. 546 W. 146th St., New York 607 Emory St., Asbury Park, N. J. 19 South Clinton St., Poughkeepsie, N. Y. 190 South St., Jersey City, N. J Magnolia St., Montvale, N. J. 439a McDonough St., Brooklyn 524 Paige St., Schenectady, N. Y. 158 Catherine St., Elizabeth, N. J. 401 Westervelt Ave., New Brighton, N. Y. 321 East 90th St., New York 2065 Anthony Ave., New York Prospect St., Babylon, N. Y. 521 North James St., Peekskill, N. Y. 501 West 144th St.. New York 132 Milligan Place, South Orange, N. J. 590 West 172d St.. New York Center Ave., Little Falls, N. J. 334 East 100th St.. New York THIRD DISTRICT 919 South 5ist St.. West Philadelphia 2020 First St., N. W. Washington 121 North Mill Road, Ashboarne, Pa. Elkins Park, Pa. 2908 West Ave., Newport News, Va. 61 Ridgedale Ave., Morristown, N. J. 8 Park Ave., South Richmond, Va. 600 West 25th St., South Richmond, Va. 2013 Benning Rd., N. E. Washington 8751 Frankford Ave., Holmesburg, Philadelphia 2085 East Kingston St., Philadelphia 1943 Harlan St., Philadelphia Delaware, N. J. 5714 Hazel Ave., Philadelphia 4427 Sanson St., Philadelphia FOURTH DISTRICT 915 7th St.. Miami, Fla. 214 7th St.. Miami, Fla Route B, Miami, Fla. 1924 Swift St., Jacksonville, Fla. 809 Palm Ave., Miami, Fla. 78 Filer Ave., Miami, Fila. 135 Bayside Park, Miami, Fla. FIFTH DISTRICT 2204 Brazos St., Houston, Tex. 1516 Arch St., Little Rock, Arkansas 1101 East Eighth St., Dallas, Texas Box 404, Pilot Point, Texas 116 North Willow St., Dallas, Texas 927 North Marsalis Ave., Dallas, Texas 407 North Tennessee St., McKinney, Texas Kountze, Texas Frost, Texas 2788 Judson St., Shreveport, La. Lucedale, Miss. 501 East Grand Ave., Marshall, Texas 33

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Cc. E. N Cc. R. Gra Fred Jan r A. W. Wa Gerald M E. L. D Wm. H James M I B : Harv« A R. W Colleg« { Arts How Jos) Sycamore Ave., Highland Park, Los Angeles, Cal.

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7 August, 1920 € ia i = PP AMATEUR KADIO STATIONS 2JU, WOODHAVEN, L. I. 2JU is the call of the A. R. R. L. Dis- trict Superintendent for Brooklyn, Mr. Clifford J. Goette, and is very well known throughout the eastern half of the coun- try. The extreme simplicity of this station is striking, but in our estimation this is an essential in a good relay station. In other words, this station looks very much as one would imagine it would, from hearing it on the air. The transformer, under the table, is one of the old 30,000 volt United Wireless open-core “coffins” which a number of prominent relay stations have used with excellent performance. In a compact group on the transmitting table are a Grebe synchronous rotary, two .014 mfd. Dubilier mica condensers in series giving a net capacity of .007 mfd-, and the famil- iar pancake O. T. Note that the arrange- ment is such as to make the closed-circuit leads extremely short. Mr. Goette states this type of gap seems to be very efficient with the open-core transformer and he ex- pects to break records next winter. The receiver consists of a Grebe regen- erative tuner and Grebe tube equipment— detector and two-step—and Baldwin phones. Except for the key and change- over switch, also an old United, there is nothing else on the table. The influence of a little commercial experience is certain- ly seen in this station—things are business- like and arranged for the efficient handling of traffic.

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5HA Alex il ally conve! +} see Thi explar con former, rotary the lead and at QsST August, 1920 5HA, ALEXANDRIA, LA. f Mr. F. B. Beuhler, ; to be an exception- ition. Everything is ed and well installed , station we like to clear that very little iry. The transmitter Thordarson trans- ‘a condenser, Hy-Rad ed vertically to shorten oscillation transformer, type of antenna cur- rent meter. The receiver for short waves is a Paragon regenerative, with deForest variables; while a 15-unit deForest set em- ploying honeycombs is used for all waves above 600 meters—to our mind a splendid arrangement- A two-stage amplifier is available for use on either receiver. No trouble is had copying arcs and sparks on both sides of the water, and many DX ama- teurs are heard with fine audibility. 5HA puts 5.2 amperes in the aerial, and should be an important relay station next fall. 7CC, MOSCOW, IDAHO This western station is an im- portant link in our route to the northwestern coast. It is oper- ated by the District Superin- tendent, Mr. Rupert E. Kempf. Thordarson transformer, rack condenser, Hy-Rad gap, Mur- dock switch, and Adams-Mor- gan oscillation transformer will be noted on the transmitting side. Antenna reading is 8.4 amps., with 8 inches coupling, and communication has been had with 9JE, 6EA, 6BR, 6BQ, 6ZA, etce., while the record transmission is to 9CA and 9EE.

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August, 1920 1AK, FALL RIVER, MASS. This is the station of the A. R. R. L. Superintendent for Lower Massachusetts and Rhode Island, Mr. Harold C. Bowen, which has done excellent work this season. Transmitter consists of an Acme % k.w. transformer, seven sections of Murdock condenser, a Benwood rotary, and a Thor- darson oscillation transformer. Antenna current of 3.2 amperes is obtained with six inches between the OT. windings For short waves, the receiver is a Paragon, with Wireless Specialty Apparatus Co., two-step amplifier. An Eaton oscillator and honeycomb coils are used for long waves, with the amplifier so connected to a small key switch that in one operation the aerial and amplifier can be switched from the short wave set to the long wave re- ceiver: The antenna consists of six phosphor- bronze wires, 50 feet high and 50 feet long, with a rat-tail joining a phosphor-bronze rope for a lead-in. For a ground, a coun- terpoise the size of the aerial is used, bur- ied in the ground directly under the aerial, besides grounding onto all the pipes in the cellar. The receiving record for this station on short waves is 5ZA, Roswell, N. M. Prac- tically all the high powered arc stations have been copied, most of them several feet from the phones. The sending record is Capleville, Tenn., 1100 miles, where the signals were reported QSA with a single bulb and loose-coupler hook-up. A BRITISH AMATEUR This is Mr. George W. Hall, a QST en- thusiast, at his station at Wigan, England, and we’ll say he has quite a receiving set. In fact, he has three of them, covering all waves up to 25,000 meters- The long wave set and amplifiers are not shown im this photo—they are on a separate table on the He uses S. G. Brown reed type re- ceivers (British) and on this aerial hears Carnarvon, Horsea, Nauen, Nantes, Eiffel Tower, etc., all over the house. Can’t you hear 8ER too, O-M.? left.

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dio Club Or have adopt city as amateurs All amaté Chicag prior to sions sucn urgency, such worl ager The fol been ad dio traf be effect 12th, are me! associat Ravensw Radio Rel Operat 6A. M 7P.M 10 P. M fic a From test, distance 7P.M traffic only test or tur that per you, it w QRX station known tl} for long 10 P long distan period tune or Amate be knowr stations ft vice vers Traffic section of keep a which two or ! QsT iE AFFIUA utive Council com- ficers of the Chicago with the A.R.R.L. tion of which is ex- n article entitled “Ra- in the March QST), regulations for their low, and all Chicago verned accordingly. particularly note that for long distance work ept on special occa- r messages of extreme special authority for ted by the City Man- s and regulations have -ontrol of amateur ra- of Chicago. Same to after Monday, July to all amateurs who er of the three radio ve, South Side or bers of the American Free air. Local Traffic Only. Long Distance Traf- 7 P. M. amateurs can locally or to long thout interruption. M. is given over to local ne will be permitted to that period. If during g¢ distance station calls r duty to inform him to M., or have some other as it will be made ty of Chicago is not open traffic before 10 P. M. \. M. will be given for traffic only. During this ll be permitted to test, local traffic. ted on the north side will her loca] or long distance irs on the south side, and | be appointed in each who will be required to r and who will determine priority rights whenever ns conflict. mH August, 1920 ; 7 “Ewe Wry. e” Radio Club Arriciateo wit Tee LUDS Under no circumstances will a member of any of the three above named clubs be permitted to communicate with so-called outlaws or unlicensed amateurs. Members will endeavor to locate such stations and make a report to the traffic chief who will in turn report to the City Manager. The City Manager will endeavor to persuade such outlaws to become bonafide members of clubs. In failure of this such outlaws will be turned over to the Radio Inspector for action. Any violator of the above rules and regu- lations will be fined not less than 25 cents for the first offense, and accordingly for each offense thereafter. Remember, fellow amateurs, this is all for your own good and it is the aim of the Chicago amateurs to make this city one of the most efficient in the world. If there are any questions that are not clear, I would be pleased to answer them if you wil] write me a letter stating your question. F. H. SCHNELL, Chicago City Manager, 2220 Roscoe Street, Phone Lakeview 2221, Radio 9AH. THE CENTRAL DIVISION CONVENTION The officers of the Central Division have hated to see any part of the country “put it over on them,” and it is quite evident that this has been done in the holding of Conventions, as witness those held in Bos- ton and Philadelphia. There is one thing that can be done by the Central Division, however, and that is to hold a Convention which will be ahead of those already held in both quantity and quality if not in date, and accordingly the Central Division Man- ager is planning on the holding of a Con- vention of all amateurs of the Central Division, whether League members or not, this assembly to be held in Chicago during the first week in September. There will be a banquet and meeting on the or- der of those in Boston and Philadelphia, and in add'tion the Chicago Ex>.cutive Council will provide for the entertainment of visitors. This Convention will afford an excellent opportunity for the Western and Central Western Amateurs to get together, and attendance, if at all possible, is strong-

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August, 1920 ly urged. Chicago has approximately 500 amateurs and present plans are for each visitor to be taken care of by one Chicago man. There will be sight-seeing tours of the city, both daylight and dark, and the Chicago Executive Council is assuring all visitors of the “time of their lives’’. The Chicago Executive Council is acting as “Committee on Arrangements”, and accordingly radio men wishing to attend the Convention should get into touch with this Council in order to secure reservations. Such communications may be addressed either to the Chicago City Manager, Mr. F. H. Schnell, 2220 Roscoe Street, or to the Central Division Manager. Mr. R H. G. Mathews, 1316 Carmen Avenue WASHINGTON RADIO CLUB The Washington Radio Club (D. C ) has adopted QRM regulations looking to the im- provement of conditions for long distance work after 10 P. M., and has distributed a circular containing the regulations among the local amateurs. ESSEX COUNTY RADIO ASSOCIATION This organization (application for affilia tion received) was formed in Salem, Mass., three years before the war and increased steadily until the outbreak of war, when most of its members enlisted It was re organized in the fall of 1919 and } t The Radio QsT Club of Tacoms 39 largest membership ever, and enthusiasm proportionately great. A strong organiza- tion for the whole of Essex County, Mass., is their aim, and Lynn and vicinity have already merged with them as a section They are a wide-awake outfit, well deserv- ing of amateur support, and their presi- dent, Mr. F. Clifford Estey, 22 Oakland Street, Salem, would like to hear from in- terested amateurs in Haverhill, Lawrence, and Newburyport. RADIO CLUB OF TACOMA The Radio Club of Tacoma, Washington, recently voted to become affiliated with the A. R. R. L. This club was first organ- ized in October, 1915, with eighteen mem- bers, expanding rapidly until the outbreak of war. Resuming again a year and a half ago, it has outstripped its former progress and is a live-wire and hustling organization, numbering within its body all the promi- nent radio men in that vicinity. Its Ex- ecutive Board consists of Lester E. O’Brien, President, District Superintend- ent of the A. R. R. L.; Geo. Miller, Vice President; Neville Benoint, Secretary; Les- lie Lunan, Assistant Secretary and Press Agent; Merritt Cookingham, Treasurer; Chas. Dow and H. F. Campbell, represent- ing the membership at large. A very good photograph of the club is reproduced be- low. The club would appreciate exchange qd i a A oe ede Si

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40 QsT August, 1920 of papers r organizations. The club by Mr. Warren Benson. This organiz- secretary’ 5040 South L Street, ation has been in existence over three years Tacoma and kept active during the war by having a code practice meetings and ee ' — on theory and practice. Three members o RADIO x x ieee the club have radio telephones, and several yun ae Se ' concerts have been given. At the meeting of the Radio The club also has a social end—rather a Traffic Ass held at Brownes Busi- wynique feature in a radio club. Last Octo- ness Collt yn, N. Y., on June ber it celebrated its third anniversary with 4th, 192 wing officers were 4 dinner, and since then has had several elected stag parties. The first real radio dance Mr. Wall: e, Chairman. in Brooklyn was held by this organiza- Dr. De er. 1st Vice Chairman. tion on April 30th at the Apollo Studio. Se Sow 2nd Vice Chairman. be Social feature has created an atmos- angie Pg - . phere of brotherhood which has served to _Mr. Fr Maher, Corresponding tighten the bonds of the Great Radio Fra- Secretar) ternity. Mr. All ion, Recording Secre- celal sedipenatialendinad tary. AMATEUR RADIO IN HOLLAND Mr. F. ¥ ttcher, Financial Sec- By SEEFRED BROS. retary. —_—_— Mr. J er. Treasurer. R. G. ROES, of Dordrecht, Holland, Mr. Cliff e, Traffic Manager has given us some interesting in- : ; - one pie ' formation on Dutch amateur radio Mr. Er i, Editor, “Radio Traf- work, for the readers of the QST. fic Bulleti: Mr. Roes tells us that Holland Mr. Cl bs, Associate Editor. is as free a country as ours, but neverthe- The al constitute the Board less transmitting is strictly prohibited. of Direct Association to serve a Without the privilege of operating a send- term of or inning July ist, 1920. ing station, wireless would lose seventy-five Our prt bership numbers eighty- per cent. of its attraction for an American ae ond t e majority of foremost ®™ateur, but his Dutch colleague is only amateurs Metropolitan District. allowed to receive (a few semi-official ex- Amateurs of joining are invited perimental stations excepted) and even re- te comin with the Corresponding ceiving stations have not always been per- Secretary Sixth Avenue, Brooklyn, itted. ryv & bn : Before 1913, one was not allowed to oe Ae ns by radio should be — routed via Clifford J. Goette, Traf- operate any radio instrument, but after fic Manag that time objections to receiving were re- ” — by the great ny 4 4 a in , ugust, 1914, every station had to be dis- outa : & W. vs. > — mantled. Although Holland had no part Ay —.. e ahem ‘ati - jin the war, the authorities seemed to be van | naveurs Association was very much afraid of radio, so even receiv- formed al d off - a —— 7 ing apparatus was barred. In September, —— oP — “ia :~ wr wf 1917, they were again permitted, and one senak L and Prof H W Har. Could erect aerials of any size. A year eS oy eee Oe er =later, Mr. Roes was the first amateur to mon, of - +h vi ae gp receive the high powered American sta- ne . ’ eted Presid be oo tions. With a single Dutch-made vacuum wh = SADE New Castle’ Sax, tube he heard NSS, NWW. NDD, and NFF. Mall cy hould ow vows, their Shortly afterwards several reports came in eetieais > aa ae te . ishes from other amateurs who heard those sta- Som ool ave our best wishes tions, and at this writing every amateur is oF Soom hearing them. = In long-distance short-wave work, Dutch RADIO CLUB OF BROOKLYN amateurs have almost no experience The Pr Radio Club, Brooklyn, It will be interesting to learn that, up to N. Y., 4 that it has changed its 1916, audions were almost unknown in name to » Club of Brooklyn, under Holland. Mr. Roes bought a de-Forest T- which now incorporated under tube when in New York in November, 1916: the laws York. it remained the only V.T. in Holland until The thirty-odd members, all March, 1918, when Dutch-made vacuum having fir amateur licenses. Meet- tubes were put on the market by two or ings are three firms, “Philips” tubes being the best ry other Friday night at rooms kindly loaned the 4 Fuller

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August, 1920 fm iM it MM iif Ten sme ty ij i ii After that NSF-9ZN chess game, we won’t be surprised when we hear of poker- by-radio. We suppose it’s only a question of time until some bright lad will get up a code for matching pennies and shovting craps over the air. Who has a good system for keeping a lon” We would like to hear something on this subject. A card to stations over 500 miles whom you hear will certainly be appreciated and will do more toward causing that particu- lar station to improve his outfit than any other thing—it will create a genuine de- sire to get the maximum out of his appa- ratus. Do it. After looking over the average monthly collection of current radio literature, we feel that we are continuing to be sincerely flattered every month. But there is only one A.R.R.L. and only one QST. By the way, the A.R.R.L. fading tests are going to show the maximum transmit- ting range of some of our stations—in summer, at that. Does it hurt to put the B battery through the filament of a tube? Goddard of North Dakota says it does. Any echoes? Comply with the radio laws! Do you know that the Navy Dept. keeps a log of amateur activities so as to have data to show against us if it is ever needed? Keep down on 200 and whet up that wave—it will carry just as far—farther, even At the last meeting of our Board of Direction, Mr. C. R. Runyon, jr., of 2ZS, tendered his resignation as a Director on account of press of other duties—he has quit the radio game. We are sorry to see 2ZS out, but will not be at all surprised when the little bug bites him again. Seefred Bros., 6EA, Los Angeles, have been copied many times this past season at an amateur station in Honolulu, Hawii, a distance of 2100 miles. Our congratula- tions! The Honolulu station reports audi- bility of signals about 7, using an 8-stage amplifier. Now for some Atlantic Coast station to get through to the Azores, about the same distance. East-bound ship opera- tors, keep an ear out for some of us, will you? We are pleased to see that the manufac- turers of valves have recognized the ama- teur demand that a tube intended for de- tection be a soft tube with some residual gas. It’s what we want. The Alexanderson multi-tuned aerial has resulted in an immense improvement in the efficiency of high-powered stations. It should prove almost equally suitable for our work. Is any amateur experimenting with this system on 200 meters? If so, let us hear from you. It pays to have your picture “Who's Who”. A lady in Wyoming or somewhere has fallen in love with Charlie Service’s likeness. QST in the role of match-maker we never even dreamed it! They tell us nearly every member of the Radio Traffic Association of Brooklyn is wondering if his own particular Sweetie isn’t the authoress of that recent letter in their Bulletin, signed “Helen”, bitterly complaining about how nutty radio makes a chap. Who’s the recent new-comer in the long wave arcs? Bordeaux, we wonder? He seems never to sign. Press dispatches from London tell of a wireless concert at the Chelmsford Marcon! station, when Madame Melba sang selfec- tions in English, French, and Italian, her voice being heard, ful] and mellow, at Ber- lin, Paris, The Hague, Christiania, War- saw, etc., over a radius of a thousand miles. The Department of Commerce advises that preparation of the List of Radio Sta- tions of the U. S. began on July ist. It is not expected that it will be ready for dis- tribution until some time in August or possibly September. It will contain Gov- ernment, commercial, and amateur sta- tions, and will be distributed by the Super- intendent of Documents, as heretofore. The price cannot be determined until it is completed and the cost is known. Dan Cupid has installed a radio set. On June 17th a girl in Detroit and a “gob” on

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42 QsT the 1 ham, 1000 mfles off the ( , were married by radi y and her friends gathe n Detroit; the min- ister 1 bride’s side of the argum< raph office where it wel n to NAJ, Great Lak« radio to the Birming- har fter so long a time a unifor ume to the church with t f the ceremony, upon rea reyman declared the busir the bride and her frier celebration. Next! TI rd on a 3-foot loop n It ted in June QST, is good has favored us with the | rewith; the loop is coul 1its using tickler fee vas located in a room f |, and consisted of fiv c. wire wound on », with the turns spa During winter the a fr laré

a | signals varied from 60 ¢ ng received with an au numerous occasions. The t was of course very r in quite a reduction klyn) report the dis- appeal f their prominent mem- be it that he hitched up sevent n amplifier and a piece of st and knocked him flat. TI » Company, Inc., have est vy branch store at 15 Ten Portland, Maine. The brar nder the management of Mr. H r, who is a well known rad area. This is the first brat established by this pro- August, 1920 gressive organization but others are looked for in a comparatively short time. The Editor refuses to answer inquiries as to why the June QST had the cover it did- enuiienitep The Boy Scouts of America are co-oper- ating with the Navy Dept. in collecting ad- dresses of amateur station owners. The Navy broadcasts from NAH, details of which were published in QST for October last, are particularly for the Boy Scouts. The information sheets mentioned in that article are being handled by the Scouts as a matter of public service. Any amateur interested can get full particulars from the nearest Scout headquarters or by address- ing Armstrong Perry, Seascout Radio Com- modore, B. S. A., 200 Fifth Avenue, New York. Applicants for commercial radio license are now tested on their sending as well as their receiving. Transmissions by an ap- plicant will be received by the examiner and also graphically recorded on a tape re- corder. For first-grade commercial license, applicant must transmit satisfactorily for five minutes at 20 words per minute; and for second-grade commercial, at 12 per minute. We are glad to see this; experi- ence has proved that just because a man can receive 20 per is no reason why he can send stuff at that speed that anybody else can read. It should materially improve the standard of the fists we hear on 600. Many of them need improvement. THE HAM’S PSALM QST is my Bible, I shal] not want another. It maketh me to lie down after midnite, It leadeth me to sleep on my instrument table. It wirelesseth my soul. It leadeth me into paths of sleeplessness for the relay’s sake. Yea, tho I monkey with my junk danger- ously I fear no annihilation, For thy “Don’ts” and thy “Warners”, they comfort me. Thou preparest a contest in the presence of mine enemy hams; Thou anointest my dome with transfor- mer oil. My bulb, she spilleth over- Surely Insomnia and Relayitis shall follow me all the days of my life and I shal] dwell in my radio shack for- ever. AMEN. HAROLD HUSTON, San Fernando, Cal.

Errata in the article on “Constructing a 500-volt Rectifier Transformer for C. W. Work,” in the June QST. Mr. Muns, the author, advises that to give the follow- ing secondary voltges, the stated number

} i + i

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August, 1920 of turns should be wound on each section of the secondary: 350 volts—1300 turns 400 - 1480 72 450 _ 1660 5 500 - 1850 ” Mr. R. H. G. Mathews extends a warm invitation to all radio men visiting Chi- cago during the coming Central Division Convention to make 9ZN their headquarters during their stay. A register of visitors and their stopping places will be kept, with bulletins of the various activities. This is the pet hook-up of Mr. A. T. Hovey, of 1FT. Although a critical cir- cuit, Mr. Hovey states it will amply repay the effort needed in familiarizing oneself with it, and is operative on either arc or spark from 200 to 20,000 meters. Con- densers 2 and 4 are adjusted for regenerat- + kd ad bt i | slotelelelelatal WII] C3 = OO Ce= 0005 il| * ng spark stations, condenser 3 not being used except on very close stations. Although regenerative adjustments will also serve to cause oscillation, condenser 8 is used for this purpose, with finer ad- justments for undamped signals secured by condensers 2 and 4 the same as for sparks. New publications received. “Super Range Receiver’, by M. B. Sleeper. No. 4 of a series of pamphlets on Radio and Model Engineering, published by General Apparatus Co. 4 pp., 8%” x 11”. Com- plete directions and detail drawings for the construction of a tickler feed-back receiver to cover 6000 to 20,000 meters on anten- nas of .00045 to .001 mfd., employing Mr. Sleeper’s well known system of unit pan- els. Good reliable dope. WOULDN'T IT BE WONDERFUL— If we smokers didn’t always run out of matches about 1 a. m.? If some of these radiophone operators would lose their false teeth for one night? If Pacific Coast amateurs would quit knocking San Diego receiving stations when the latter have the big Poulsen arc at NPL to contend with all night long? If printing presses didn’t break down or QsT 43 QST could fifth of the something happen, so _ that arrive everywhere by the month? If somebody would lend NRH a meter? decre- AMATEUR RADIO IN HOLLAND (Concluded from page 40) of them. He has sent us a small catalog describing these tubes. At the present time you can buy there any make of receiving tube you like. In 1916 the “Nederlandsche Vereeinging voor Radiotelegrafie’ (Dutch Association for Wireless Telegraphy) was founded, having, in 1920, about 1500 mem- bers. The population of Holland is ap- proximately six million. Mr. Roes reports that a number of Netherlands amateurs are copying the Dutch stations at Tjililin (PKI) and Mala- bar (PKX), in the Dutch East Indies, on simple equipment. The distance is about 11,000 km., so that this represents very excellent work. A HAM ON THE TELEPHONE (Concluded from page 7) “Hello.”” This from a male voice. “Is this Mr. Stone?” “Nope, wrong apartment.” “Well, what IS the matter operator?’”’ “Wish the deuce I knew. with that I'd like to lay my hands on him for one minute. He’s been raising h with our phone.”’ At this the irrepressible Mr. Barney could no longer restrain himself and yelled “*De-de-de-dut-de-dut”’. “There he is now!” Both voices. “Well, cut out that QRM and I’ll try to get the right party for you”. James, of course. “What?” cried the exasperated women, and the supposed Mr. Stone gently replaced his receiver. “T sed QRX and I’ll——” “T’m a what?” “Say, how do you get that way? I didn’t say you were anything. I said QRX —” at this juncture the annunciators re- commenced their vigorous rattling. James continued, “Say, I can’t get you through this QRM- Better give me that on buz- zer, Old Man”’. “OLD MAN, SIR! ! I’m going to com- plain to the company’. CRASH!!! That was enough for James. He gave a single hopeless glance at the dancing annunciators and ran. Then his common sense returning he did likewise. He care- fully erased the record of his thirty-five cent call, and placing the headband of the phones in his pocket he again, with a dig- nified gait, made his exit.

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44 Ww old Cc suite”’ working thirty-fi I, and the san deF ore with ar mak« the d janito1 “ey oe! he as! I cou would “Sure, down about t I jam! the band ninet and te that sound know its nar is, i be s vislit statior tina cert know t Sh he re OousIY table, H we unges Say that ri that, P Say, see Her put ir NSS There QRM —Icel it’s rig) south y QsT August, 1920 lhe Heterogeneropliodynatron By Herbert Richter static, we did, Gonzl discussing the re- of various Corn rts on ears. Nothing park, so I threw the are, and “tout de ir old reliable, NSS, hru the static, about fast for me’’, thot partner Gonzl voiced (Here’s your chance, ference works better ting two feet away; Some one tapped at t, and in walked our 1s Bolsch. your vireless today?” “You know you said some time and you the things about it.’ ”’ I answered, “Sit yw you a thing or two : sit down.” pair of phones and n over Bolsch’s ears, at ng out, with the head- ever to catch a hair, 1ining fourscore hairs ten, Nicky, do you hear r?” “Ja, ja, that visling that’s station PDQ—you has three letters for Ours? Sure, ours here t, Gonzl? Oh yes, to vy, you still hear that Well, as I said, that’s northeastern Argen- to give a wireless con- one every day. You nd music by wireless. in a minute now— nd with that Gonzl furi- ung variable under the ert was being given. t stiff, so he suggested else. “All zu viel ist i, “As a German would nd German, Nicky? Is what do you know about here can speak German. sending press? Let’s some inductance and yndenser, and here was me on a lower tone. marked, “That’s station narvon, Iceland, sending you’re right, Bolsch, east there, just straight ) Pole. They are send- ing the world’s news to Greenland now; guess I’ll take down what they are send- ing.” With that I stabbed a piece of paper and wrote down what they were sending (NSS was going thirty-five per, and twenty was absolutely the fastest I could handle then.) I wrote down news at least three weeks old, reading off as I wrote down; it was interesting; poor Bolsch “Bit”. “It must be _ inderesting ven you can understand vunce vat dey are saying”’, he averred. Gonzl just winked, and I winked back; that’s all we did, Gonzl and I.

“Now, Herr Bolsch, would like to hear some commercial messages? Let’s tune in QRA, what say, Pard?”; this from Gonzl. “Sure, might as well; you hear something interesting once in a while.” And soon we had NDD sending about ten words per minute and repeating, ready to put you to sleep. “Say, by Jupiter! but they’re going some; guess you'd better take this down, Gonzl; too fast for me.” Gonzl nonchalantly took a piece of paper, and here is what he wrote down: “Hr Viadivostokski Pr 41768 9/14 8:14% Jan. 23—-O U Nutshellopski, Noncomposmentis Street, Lunaville, U. S. Asked Lina for you; she says yes; Come at once. (Signed) Ike Amblotski.” “There, that’s all. Say, read that, Nicky, and—what ? can’t read ? Well, hear me read it: Sent from Viadivostokski, No. 41768 9/14, at four- teen one half minutes after eight, January 23rd, 1920, to Mr. O. U. Nutshellopski who lives on Noncomposmentis Street in Lunaville—but say, Nicky, did you notice how long it took the message to get here? Just a minute and a half! Going some, eh, Nicky? Well, you know these wire- less waves travel just 300,000,000,000 millimeters per second; quite some speed, eh? Oh, yes, the message. The message is: I asked Lina for vou; she says Yes, I am yours. Come right asvay quick; she

= ~—— ai <n 4s ke oe ee mj eee ee

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oe im, Cn wie * August, 1920 is waiting. The fellow who signed it was Mr. Ike Amblotski. There, that’s all. Pretty nice, eh? Bet Mr. Nutshellopski is happy, eh?” “He, he, he,” interpolated Bolszh, “do dey efen get married by vire- less, hey? He, he, he.” “Sure”, I told him, “ard any time you want to get married, just let us know, Nicky, and we’ll do it for you by wireless. What? Oh, married once, that’s enough, eh? Well, maybe you’re right there, Nicky. But say, Bolsch, guess we’d better show you some of the separate instruments, since you’ve now heard the message themselves. You’d like to see them, not? Sure, thot so.” “Well, this is a deForest three-element oscillating vacuum valve radio detector (I pointed to the good old Audion, at the same time allowing a little blue glow to appear.) When you heat that filament, electrons fly off—you know what an electron is, don’t you? Never saw one? Well! You know this word, look here, Nicky, e-l-e-c-t-r-o-n. “*Elek’, you know,” explained Gonzl’’, means ‘little’, and ‘trones’ means ‘chunk’, so you see ‘elektron’ means ‘little chunk, and that’s what the electrons are, Nicky.” “You see,” I went on, “When you heat that filament, it gets too hot for them there and they fly off to that cold metal plate—see them fly? Ja, ja, right dere in dat blue part; see them chasing each other?” And finally Bolsch was con- vinced that he saw what no man ever saw before: an electron. “But dey are pretty small”’ he told us, “and vot is dis?” Here he pointed to our forty volt storage battery, “That? Oh, that’s just our source of high potential current, which we use once in a while. But it only gives us a little over forty million microvolts, but then that’s about as much as we generally need.” “Well,” Gonzl went on, “This three ele- ment oscillating deForest vacuum valve radio detector you know can be made to wiggle over a million times a second, so that—Did I count them? No, not I alone, but my partner here and I have done it together by—How? Oh, it’s not so hard; QsT 45 there are several way of doing it, but we do it by means of some katabolical and metabolicalmathematical curves in con- nection with some, metaphysical formulae You understand, ‘not? Not very well? Well, the next time we do it again we'll let you know about it, so you can come and help us; then you’ll understand it all right” “Sure”, I broke in, “We are making some new hyperbolical curves (our old ones broke) and then when we are thru we'll try again.” A 200 watt globular Mazda without a base lay on the table; we had stuck some tinfoil on it in a high frequency experi- ment. Bolsch pointed at and touched it— “Look out, look out, Bolsch,” Gonzl quick- ly called out, “That’s our Hetero-genero- plio-dynatron.” “Ha? I tot it vos a tree-lemon os-os-osculating—vot did you called it?” “No, Nicky”, I solemnly told him, “That is no vacuum valve as you suppose; it is our Hetero-genero-plio- dynatron, and it is somewhat dangerous to use it.” The Hon. Janitor backed up two feet. “You see, it radiates waves of extreme- ly short wave length—”. “Extremely short,”” emphasized Gonzl. I went on: “Extremely short waves which may be- come quite harmful unless _ properly applied.” Bolsch was five feet away by this time. “The danger, you see” (this from Gonzl) “Lies in the fact that most people know not how to use them.” We followed him up here. “All short wave lengths become dangerous, Nicky, you know. But these however, are quite useful—.” “Quite useful,” I broke in this time. “Quite useful in treating certain diseases, especially such as pediculosis, and even more so if such treatment must be done by night. Ever have pediculosis, Nicky?” “N-n-no.” “Well, anyway, would not ad- vise you to use these extremely short wave lengths until you are thoroly acquainted with their dangerous properties.” Bolsch was two feet from the door by this time; we followed him up. “Gonzl and I’, I told him, “Have made a thoro study of this instrument and how to use it. Should you ever have use for this instrument, just call on us and we will show you how to use it But look out for those extremely short wave lengths—”. jolsch was outside of the door and had closed it; the Hetero-genero-plio-dynatron had done its work. I flung myself into a chair; Gonzl simply stood and stared at me, then burst out laughing: “Guess we'll show him the Transmitter next time, if—Saprastieffel, we missed NAA time sigs altogether.”

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46 CRacio Communeations aA DY the cAmateurs—__ ‘ & Tre - STATEMEN

QsT

August, 1920

QST ASSUME NO RESPONSIBILITY FoR THE EIN BY CORRESPONDENTS »*® . .

REPLY IR Editor, QS7 I must in his cr lished m t a stricti) be erro! are used | the matt to the princip! In the is inten effe ‘tivel) under way is mining all case for the antenna ments) reading is attain ficulty long ar turned diatior tions r ened by the anter ing it fu age. E ened the frequer first and brushing “brush” v in radiat considera ther decr« cided ds beyond t decrem¢ shortens much was appr much nal stre experime! mitter w Mr. W into cons W ASHINGTON’S TTER E. Fourth Street, n, Ils., June 28, 1920 th Mr. Washington article by me pub- umber of QST. From tandpoint there may some of the terms I am able to judge, conforms strictly generally accepted radio transmission. maximum voltage na radiates most ted at a voltage just int and this in no formula for deter- resistance”, as in transmitter (which s letter will include well as the instru- i that the ammeter when this condition xperiment where dif- was encountered a ted This was then sults both as to ra- ngth at distant sta- antenna was short- feet at a time till badly that shorten- iously of no advant- antenna was short- shown by the radio nereased, slowly at more rapidly as the approached. When ticed a slight decrease <perienced and also a n decrement. A fur- rth resulted in a de- ition and a decrement Both radiation and er as the antenna was betterment increased the brushing point s was also true to a le degree in the sig- int stations. In these K.W. 500 cycle trans- 4 joes not seem to take that in spark transmis- sion, the energy per impulse (or per spark) and not the average value as shown by the radio frequency ammeter is what “makes the noise in the receiver”. With a given power input it is certainly obvious that with equally efficient apparatus, each wave train at a low spark frequency will con- tain a proportionately greater amount of energy that when the same power is dis- tributed among a greater number of wave trains in the same space of time. A tone can be no louder than the individual im- pulses of which it is composed, so the num- ber of watts radiated have very little to do with signal strength except as they are in direct proportion to the effectiveness of the adjustments of the one particular trans- mitter on which the measurements are made. As to radiation resistance. Quoting from pages 81 and 82 of the Circular of the Bureau of Standards No. 74, “The amount of power radiated depends UPON THE FORM OF THE ANTENNA, is propor- tional to the square of the current flowing in the current antinode of the antenna, and inversely proportional to the square of the wave length of the oscillation. Since the dissipation of power is proportional to the square of the current, it may be considered to be caused by an equivalent or effective resistance which is called the radiation re- sistance of the antenna Thus the radiation resistance of an antenna is that resistance which if inserted at the antinode of cur- rent in the antenna would dissipate the same power as that radiated by the anten- na.”” May I point out that while the power radiated may be expressed by the formula quoted in Mr. Washington’s letter it is DETERMINED BY THE SHAPE OF THE ANTENNA and it does not necessarily fol- low that increasing the number of wires in an antenna will increase the “radiation re- sistance”? In fact, actual exnerience shows that the opposite is quite often the case. What Mr. Washington says concerning the effect of the charge of the conductor, etc., as to brushing, is correct insofar as it applies to the apparatus and the leads connecting it, but insofar as the antenna itself is concerned it is not of so great im- portance. When an antenna brushes it commences at the open end and as the pow- er or voltage is increased the brush ex-

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2 August, 1920 tends further and further towards the transmitter. In many cases the leads to the transmitter will brush badly without any very great increase in decrement or fall- ing off in signal strength and at the same time no brush effect can be detected on the antenna itself. But as soon as brush is noted on the wires of the antenna a decided decrease in signal strength will result and with it will be a fall of radiation and an increase in the decrement. It would logic- ally follow that there is a limit to the pow- er that an antenna will radiate and that this limit is the brushing point, as is well known to those familiar with the opera- tion of high power arc transmitters. Again quoting from the Bureau of Standards Circular No. 74, page 124, “On account of the skin effect, the series re- sistance in a condenser increases to some extent with the frequency.” My experi- ence with short wave transmission indi- cates to me beyond question that it does so increase and, as the shorter waves are used, increases “enormously’”’. All amateurs are familiar with this difficulty in one form or another. A one K.W. transmitter can be operated on 600 meters with leads in the closed circuit so small that if they were used on 200 meters would decrease the efficiency of the set to such a point as to render it inoperative according to amateur standards. In my article, “ohmic resist- ance’’ was purposely used in distinction to “dielectric hysteresis,” which in favor of the amateur does decrease as the frequency Increases Mr. Washington’s comparison of the re- sults attained with his two transmitters is not convincing to me and I believe to the majority of the leading amateurs. Frank- ly, I’d like to see that 60 cycle set of his. All amateurs know the vast difference in range attained by different individuals with practically the same apparatus too well to form conclusions from such a test. How- ever, the article in question was not in- tended to discuss the relative efficiency of 500 cycle quenched transmitters as com- pared to 60 cycle transmitters but rather to help each one get the best results from the apparatus he has. And the instruc- tions and principles therein if carefully fol- lowed will not fail to achieve that result. I believe that Mr. Washington will agree that it is an extremely difficult matter to write a non-technical article of the nature of the one in question and not leave one- self open to some criticism from a purely technical standpoint The selection of proper terms in which to convey one’s meaning is difficult indeed, as, for in- stance, the use of “ohmic resistance’’, to express the resistance in the conducting portions of a condenser. And I hope the anparently personal nature of this commu- nication will be taken in the proper spirit, QsT 47 as no personal criticism of Mr. Washing- ton or the opinions he expresses in his letter is intended or implied. Very truly yours, M. B. WEST. Dear Eddy: The Old Man seems to have overlooked one of the troubles of a modern radio bug. Perhaps he has as yet not tried to hook up a radiophone and make it work. He has something coming and we all want to hear about it when it does come. Friend Kitty will be drowned, the old pipe stem will be gnashed in two and some new cuss words such as Uggerdam and Wuffcoises will see publication for the first time. Say, I wonder who this here Old Man is anyhow. I had a buddie in the army who knew a guy who heard somebody say he suspected the Old Man was one of those big station owners somewhere in Indiana or Illinois or maybe Oregon or Tennessee. Well, I have my suspicions it must be IIli- nois(e) judging from all the local QRM and things he writes about. But tnen we have that right here in Ohio too. Up in Cleveland furinstance is about the best place to try out new ideas on barrage re- ceivers and selective tuners I could imag- ine. Why up there there’s so many hams who read the code off the charts on the wall as they go that it makes the old timers groan and wonder when the curfew will ring so they can get a whack beyond the city’s walls with their own sets. But one night while I was up there I started hearing some honest t’ gosh radio- phone stations working. Oh boy it was great. It took me just about no time to run down the station owners and begin getting details. It looked easy. Just a small power bulb, a motor, a simple-looking generator and a few trimmings. Back down at Akron in the spring another ham and I tried it out. We had everything we thot we needed and more too. Four kinds of bulbs, batteries, mo- tors, generators, condensers, choke coils, tuning coils and meters. But would the darned collection get down to business and turn out sweet music? It would not. We coaxed, pleaded, tickled, oscillated, grid leaked, modulated, tuned, swore and every- thing. The best sound we could get was “Gr-wow-gr-whiz-s-s-s-woof-woof” or some- thing like that. But after a while we got re- sults—we did. We blew up a meter, a bulb and several condensers. This wasn’t the result we were after but we’ll try again this coming winter and then when it finally does get going we can give the laugh ac- companied by sweet music of the Victrola to the next duck in Akron or Cleveland who

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48 first st In Old M slip cour egg pal modit write carries somew labors age ust receive the C.W June tampe¢ Wo stam pe swer (Mr. M do, in 1 us wit AN OPE! Dear Des Afts gave 1 a duty incident little R Befor script ever, | memor don’t Mr. De hopi gone our te it rar Direct 1A. M the | prop boys t pore! The ‘ be ir their Anot door ! High S I have QsT th radiophone. wonder what the | ask you, Eddy, to address, only of circuit the golden price that com- Cummon, OM, ‘n Radiophones. —DAH. DEMANDS IT July 8, 1920. an article in QST prominence’ which the writer for his t pay for the post- nquiries. I have etters asking about lescribed in your ne of them sent a rder to enclose a envelope if an an- truly, ROBERT MUNS. The least we should ers to accommodate ition, is to enclose r reply. Let us do rER TO S. W. DEAN lead Hawaii Marion, Mass. compliments you ie of QST, I feel it nk you, and also to World more about our } ed to this detailed de- ttle Rotary, how- 1 reflect upon past ime Dean recalls. I of the son of this r to now and here’s Son. ... In years took occasion to cut or six times where rd Our “Board of eting! Next night at 1rrangements and put ible route under his ng night some rough on Mr. Dean’s front ling left the porch. raph Co. could not f they had a hang look to get through. e latest, is my next 1 Dean of some skirts’ ere around here, and lesire to soak his stove August, 1920 pipe silk hat down over his ears. When he walks by my radio station, you’d swear he had a ram-rod the full length of his back, and that his neck was made of the hardest steel. He’s the nearest approach to six o’clock I ever saw. But, poor feller, I don’t know’s I blame him. His cause of worry is well established, for his little dinky electric light service is hooked up in multiple with my wireless shed, and we are both trying to bust the little one KVA step- down transformer that the lighting com- pany so generously installed. When I slap the Key down and give the ol’ United transformer all she’ll take, she takes the biggest part of all there is on the line. To be exact, the voltage drops from 110 to 72. This is kinder tough on the dean’s electric lights. To stand in the street and watch ’em, you’d say someone was trying to work a blinker signal. The Dean’s got a_ telephone. So have I. They are hooked in multiple too. As soon as operations begin on my key, the bell rings. No, not from a kick back, but ‘cause said Dean is turning the crank. Being slightly interested in whether he’s calling the cops or the Dept. of Commerce, and realizing that the telephone line is mine as much as his, I take the hook down am treated to the following: “Hello. Is this the electric light company?” “Yes.” “That Man Vermilya’s at it again. Now if I can’t have electric lights that don’t shimmy up and down every time that ‘ohm chaser’ takes a notion to squeeze al] the juice out of my ’lectric light wires, I might as well have candles.” Then I hear old Kill-joy Supt. of the lighting company pipe up: “Well, you See, Dean, we had Vermil- ya on a separate transformer but he blew it up. We are going to put him off by himself just as soon as we can get around to it.” Then the Dean—‘“Well, for the love of mud, cut him off, can’tja? He’s a pest.” Here I hang up and call 2JU. No further interest develops for me. So now, my friend, I want to tell you all about that cute little quenched gap we had in the form of a rotary. You are quite right—it was supposed to be a little trigger arrangement, just as you said. Only the bomfoozled thing wouldn’t trig! We pulled and yanked at that trig- ger for a year or more and the only thing it shot off was the index finger on my left mit and the same thing on another feller’s right hand. The only one that fooled it was Hammond—he got his coat tail in it one day and while he lost the tail very suddenly, still he had the satisfaction of bending several of the copper studs, which we failed to do with our fingers. This rotary was driven by a 50 horse- power motor, and so geared that it ran twenty-one hundred a minute. The trigger disc was eight feet in diameter, with forty-

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August, 1920 eight copper studs on the outside edge. It sounded like the end of the world when it was running. It never ran over one hour, and by that time you could cook eggs on on the thrust bearings. The whole outfit was more or less of a Man-killing installa- tion, any way. Connected to this rotary we had two, one-hundred-and-fifty K.W 5,000 Volt D.C. Generators, three hundred K. W. total. If your main condenser, or the trigger condenser, broke down (and they did quite regularly,) it shorted these generators. Before the fuse and breakers blew, the machine “flashed over’’ Of all the shower of Sparks, Hot lead, Copper, Smoke, racket, and general riot, it was hard to beat the combination. We expe ed any minute to see the roof cave in on us. Things are diferent now though, Dean— we’ve got all those past killers out in the lot, positively junk. The ol’ quenched rotary’s got a wire hooked on it and it’s helping out the ground capacity. We’v got two-hundred K.W. Alexanderson alter- nators there now, and there’s not a place in the shack that you can lose your fingers or coat tails. Don’t suppose you'd like to believe it, but it’s a fact—We’ve got one man here that went to put a fuse in on the 5,000 volt circuit one day and while standing on frame work which was grounded the iron to one side of the machine and ten feet above the cement floor, he got the full voltage 5,800 right thru between his feet and one hand. It flashed the machine over and threw him ten feet to the floor. Of course he talked about the “Blue Bells” for a week—completely lost—but today he’s just as good as ever Today the only things that have worries here are the bugs that fly into the Horn Gap which is on top of the alterna tor. This makes a flash and good-bye Mr Bug. But there’s no danger. The voltage of the alternator is only about 110. The flash cannot be heard, due to the frequency which runs as high as 27,000 cycles Some good-natured alternator attendant has tied a piece of cheese on this horn gap to catch these bugs, as he puts it. He claims that’s what Alexanderson put it there for. Well I guess I’ll go back to the Bakery and loaf CUl “uN” TO THE OLD MAN AND OTHERS any [ have noted the apparently frantic attempts of many of the fellows to bring their radiation up, especially to the much to be desired (7?) ten amperes on 1 KW on 200 meters. In the first place, I am going to be a knocker, and say that in general it can’t be done,—not on 1 KW anyway. (Chorus of howls to the con- trary heard, and al! stations will pls QRT, and QRX.) QST 49 Now, in the first place what does the amperage determine? Apparently, it de- termines the power output. Yes, I admit that it does, but the wave length used also letermines a few things. Suppose we take a purely hypothetical case of a station as follows: ntenna—4 wires 50 feet long T type, 20 meters high at each end Leadin 55 feet long Now suppose we are radiating 6 amperes on 200 meters from this antenna, with a decrement which will be somewhere near .2, at least. How much power are we actually putting in this antenna??? (The chorus of howlers are not so ready with their answers, I notice.) Well, if we take the following little simple formula, we can get an idea of how much we are getting P=: xe Where P is power in watts R is radiation resistance in ohms I is radiation in amperes. Substituting, P=35x16, for example {56 watts in the antenna Where did the 16 come from, you ask? Well, that is the hazy ghost of an animal known as “radiation resistance’’, which we get from the formula:— H? R=——x1600 i? where H= Height in meters of antenna }== Wavelength in meters of radiated wave R= Radiation resistance in ohms Using the data given in the case of the antenna described above, we have 20’ R=——x1600 200° hence R is 16 ohms Now I admit that this formula is not a very definite one, and that it is very liable to error, but it will be found accurate enough for almost all ordinary results. I will state in passing that a better method to get the radiation resistance is with a vacuum tube oscillator, by the “sub- stitution method’, where we set the oscillator going on the desired wave, and get the maximum radiation on the antenna; now switch the oscillator over to a circuit containing a big variable condenser and a variable, non-inductive phantom antenna resistance, and “juggle’’ the variable con- denser until the maximum radiation is obtained with the resistance cut out. Now cut in resistance until the ammeter on the oscillator shows just the same amount of current . flowing in -the condenser circuit as.was flowing. in the antenna. Now find the. resistance..of the antenna resistance

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50 QSsT ona W e, and you have the radiat the antenna. Sur radiation resistance of th e, it may be sub- stitute the equation given. We ; that they have a statior efficiency is 45%? That’ station, I must say. of ¢ that it is possible. Well, 1 sur 10 amperes?? Under tions, as were given abo P in the antenna Natur haved station can radiate t transformer primary input, a vithin the law. Do you 4 It se that the statements of some e who are claiming that t ynderful radiations on 2¢ mistaken in some- thing. |! su fellows to figure out neral rule, however, the chief i a radio station is the a used in the antenna. Most « ng a hot wire instru- ment, er liar never lived, especia i on the extremely high fr for Relay work. Of coursé¢ rmo-junction type of meter is be used, as it is de- signe frequencies, but in most fier, storage battery, or a tubes must be bought before money on a new ammeter when the old one you made d alarm clock still wor As ency of a set goes it eon incidentally, from the vhy a higher antenna is so than a low one when trans! e we raise the antenna 10 r radiation resistance, as s iting: x1600 i} y*hms f 1296 watts. If t the same we would have adiation with a high antenr instead of a raised amou The efi of the average set is a thir to speak of. Asa general set is operated at a efficier ng less than zero, tho it’s mot n some cases. The old Tel were rated as 05, and 1 terally “Telefunken Kilowa meant 05 and 1.5 ki'ow antenna, respectively. The po rmers and motor gener- August, 1920 ators were rated at a full one ki'owatt, in the case of the 05 TK set, showing that they figured a total efficiency of 50%. Who is the amateur who claims his set is as efficient as a Telefunken used to be? It’s lucky for the power companies, end for many house supply circuits that the U. S. Law states “No private station ¢ shall use ..... a transformer input ex- ceeding one kilowatt, etc.” If it were not for this, I am sure that the regulations which the power companies have been adopting in various places would be quite strict, to say the least. The transformer input being limited to 1KW, it is up to the fellows to get all they can on this much power, and most of the transformers used by the amateurs are wofully in- efficient. Judging as a general thing, I should state that an average of 25% is more like the efficiency of most of our sets, than even 50%, while more than 50% is surely unusual (tube sets ex- cepted). Even with an efficiency of 75% overall, much more than 6.5 real amperes on 1 KW on 200 meters is pretty good, so where has the Old Man and his 10 amperes gone? Of course, I admit that some of you fellows ’way off a thousand miles from a radio inspector may do it, and the special stations will be able to get 10 amperes and even more than that on waves over 200 and with practically unlimited rower authorized, but as far as the most cf us getting 10 amperes, or anything like it, well, just forget, and be satisfied with 5. CUL NM 73 OM. “Prof Bugs” PERTINENT COMMENT 2712 Fremont Ave So., Minneanolis, Minn, Editor, QST: The American Radio Relay League, Inc Hartford, Conn. Dear Sir:— In reply to an article entitled “Why is an Amateur?” which appeared in the December issue of QST, I am sending you my ideas on the subject. I these days of supersensitive receivers many operators are able to work remark- able distances. But what is the result? Some eastern amateur his a message for some one in the west. Instead of trying short relays he burns up about an hour’s worth of ether trying to raise some station in the middle west After raising a station he finds that communication is noor but does he try and shoot the message thru some closer ststion? Most assure4- ly not. He would rather repeat his message a dozen times and work a thousand miles than shoot the few hundred on the first crack message a That is

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August, 1920 one of the earmarks of a “ham” and yet most antateur operators are guilty of this. Another great fault is calling after having once raised a station. One call is sufficient under most circumstances but most amateurs call half-a-dozen times, make a few de’s and then drag out their call, probably so some other amateur may get their call and then send them a postal. It is surprising how many amateurs are ignorant of the conventional] signals. Learn your International Signals and use them. Don’t think because you have a list of them hanging on the wall and know QRM, QRN, QRS and QST, that is all there is to it. While most amateurs can work fairly fast and know a little about how to ad- just their sets, when it comes to handling traffic in an expeditious manner, they are nil. Most amateur stations where work is handled correctly are owned and operated by men who have done commercial or government work and should not be classed as amateurs but as radio oper- ators. I believe that if an operator is an amateur call him an amateur, it sounds better than “ham”, but, if he knows the game call him a radio operator. Yours truly, R. J. Engler, Formerly, Chief Electrician (R) US.N. BLINKING LIGHTS Baldwin Park, Cal. Editor, QST: Among the Editorials for April, I no- tice one about the Power Companies. Wh°t u say about “buying out the company” is right to the point, and being much in the me boat as 8JQ, I tried out a stunt that does away with “blinking the lights.” I might as well say that the light bill will take an awful jump, but even this has one good point, namely, the discouraging of un- necessary sending QsT I have tried this out and it really works fine, and there is no blinking of the lights except when the power is turned on or off. Everyone has an old telegraph sounder in the “junk box” and nothing better could be wanted. Mount a good sized contact on the lever about three-fourths of an inch from the free end. In the one I made, I made an entire new lever out of fibre, but I believe the metal one will do just as well. Now cut out a yoke (fibre or bakelite) that wil] fit over the sounder and on which a contact may be mounted so as to make contact with the one on the lever when the lever is up. After the yoke is mounted adjust the contacts and adjusting screws so as to give as much up and down play to the lever as possible. Connect the ends of the secondary of the oscillation transfor- mer to the contacts, using large size wire. Now connect up a battery in series with your key and the sounder, and there you are. Start the transmitter and notice whether or not the current arcs across the points when the lever is down. If it does, it will be necessary to place the sounder in a bath of light oil. I would like to hear from any one who tries this stunt out. Yours truly, M. F. ROSS, 6IS (Editor’s Note: Another, and perhaps an easier method, is to shunt the key in the power circuit with a resistance of such value that the greater portion of the nor- mal current flows through the trinsfor- mer continually, and yet not sufficient in potential to cause sparking in the second- ary circuit The key then makes and breaks only the small additional current ne essary to bring the current to normal, and blinking will be almost unnoticeable A water rheostat can easily be made for Bex ooo 1 The idea is to let the juice run into the transformer all the time while sending, a switch being placed near the key to turn it on and off. The signals are made by opening and closing a shunt placed around the secondary of the oscillation transfor- mer this purpose—two electrodes in a slightly acidulated solution, with the resi tance variable by adjusting the spacing between the electrodes Such expedients are recommended only where the blinking is caused by working off a line which is so heavily loaded that

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52 QsT any int will cause notice- able volt ns, and where the trouble edied by simply get- ting wer supply for the radio common cause of blinkir ver factor—drawing exce line in an effort to put iz ber of watts. Resto- ration of factor is the best rem- ed) by Mr. Mathews on page ver’s QST, entitled “Trar e”’.) FOR TER OPERATION Danville, Va. Editor, Q For - design and ease of constr yuu think the ac- compa! commends itself? Try i Primat ndary on the same tube, 3”, 3%” or 4” in diamet und with No. 24 SCC w turns depending upon the ndary wound with 80 turn ire, and tapped at 40th, and 80th turns; Plate ‘ meter, 100 turns No. 26 tapped at 40th, 50th, 60th. th, and 100th turns. Small nsers across Second- ary, al shown. | - : PLATE COVE HI 1 i} iL Tm HAM | J y bi \o/ if} —I Ft Ther w in the design, but its simt refreshing. Ordir mary should be wound with turns, tapped each turn then every fourth turn The llate on any wave lengtl ‘oper sized coils, the Foreign S be received. This al to those who are wrest ynstruction of compli- cated who are not equipped for the truly, VY. T. Gravely. (Note lenser in the antenna lead w the ease of tuning to wat r.) short August, 1920 TELEPHONE INDUCTION June 17, 1920. Editor, QST: Does any amateur know of some method that will stop the effects of induction from a transmitter going into the telephone mains without using the third wire system, one of the wires being grounded. The third wire has been tested out at this station and although it cuts a lot of the induction out, the neighbors still complain that they can- not use their phone. It will certainly be disappointing to me if I cannot stop this trouble as I have just put my station into real working condition and, getting seven amperes out on the an- tenna now, would make an ideal] relaying station this winter. Well, OM, -here’s hoping that come through OK. Thanks and 73 Yours very truly, E. G. CUNNINGHAM 9AP. things ATTENTION CLUBS! 2043 North Twelfth Street, Philadelphia. Editor, QST: It is desired by the officers of The Third Amateur District Convention to have all amateur organizations in the Third District communicate with them through their Sec- retary or President. Much work can be accomplished if this will be done promptly. It is planned that these organizations shall be communicated with in reference to the next meeting to be held in January or Feb- ruary, next, in Philadelphia. There is plenty of time to think this matter over during the summer, but when the fall once starts in, much will have to be done to get things started. Let us, therefore, have the names of all amateur associations, so that we can index them for use later on. We advise amateurs to organize everywhere and if possible to get in affiliation with the A. R. R. League. I? only five or ten fel- lows unite to form a club or association it is better than nothing at all. Much splen- did work can be accomplished by this union of mutually inclined wireless enthusiasts QST will keep you informed as to what is going on relative to our Convention. Let us know, however, in the meantime, who you are and where you are. GORDON M. CHRISTINE, M D., President Third District Amateur Conven tion. (This movement has the hearty approval of A.R.R.L. Headquarters, and Third Dis- trict clubs are requested to communicate with Dr. Christine with the view of co-oper- ating in making the next convention even more successful than was the first one.— Editor): .

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August, 1920 XAJ—SOME STATION! 234 Vine Street, Milton, Pa. Editor, QST: QST writers, etc., have given us many a on “Short Leads in Your Trans- fine article mitter.””. I am a short lead fiend myself, but please explain this one. About a year and a quarter ago I hap- pened one day to be wandering down the fampico, Mexico, in vain I neared the old cathed- ral (everything is “old” down there, you know) Somehow, something did not look just right for a cathedral. Sure enough, there was a ‘T’ type strung between the And she treets of old search of booze. two domes, or wat you call ’em. had some neat little porcelain insulators on each wire end “At last”, I thot, “aa Mex ham to handle our MSG’s that way out”, and at once de- cided to look him over. After some back- alley stuff I found myself in a large room with a two-year-old auto-shooter smiling in my face and a husky Mexican in the out- field. It didn’t take me long to assure my friend that I was a perfectly harmless and lonesome human. (I didn’t have the heart to beat it.). After considerable explaining that I did not have time to see the Presi- dent and seven or eight other high-brows to obtain required passes and the like, we established fairly good understanding that I was a “Radio-Girl” myself and was there to pay him a friendly visit and not run- ning a counter-revolution. Naturally the first thing I asked him his name, his standing, and if he owned the mass of junk hung on the walls and else- where. His name I can’t write on this mill, he said he was Chief Operator, Junior In fact, he was everything. he put it, “belongs to the but tomorrow h— but Operator, etc. “The station”, government today, knows who.” So this was XAJ, whom we copied in the States on one bulb and across the gulf on galena. Here transmitter s where the jolt comes in. The was an old Telefunken He said 2 KW, but my limit on German from the name plate on the transformer told me he lied by 1% KW. I am sure he did. Even at 2 KW, with the leads he had I wondered how old kid NDH, lying a mile away, could hear him even with his old two Oh Boy, that half KW covered no steps less than a hundred square feet of wall space and the same on the floor (I forgot to look on the ceiling), and leads of any- thing from bell-wire on up, but mostly the former. And enough of it to make 1AW QsT 53 a twenty-seven wire aerial and a counter- poise too. Mixed up and twisted together and then some. His antenna lead was ap- proximately three times as long as his antenna. I’ll give him credit, though, that his ground lead was fairly short (he in- stalled it, he said) but it was not due to his efforts—it was merely the handiest one. Sorry, but he just would not allow me to photograph the set, or I would send you one to convince you that someone is wrong on this LEAD question. Can any of the gang account for it? Across the gulf of galena and in the States on one tube, with a mile of bell-wire in your oscillatory circuit! I can’t. GN and CUL 73. HERBERT M. WALLEZE, 8BQ, Traffic Asst., Cent. Pa. Dist., Ex-WCUI (now on the bottom) Ex-KTE (should have been ten years ago). CONCERTS de 2AB Amateurs in the vicinity of New York were recently treated to a concert of dance music transmitted by radiophone from Sta- tion 2AB for the benefit of the Radio Club of Brooklyn, some fifteen miles away, where loud speakers were placed in the hall and the radio music received as loud as an orchestra which furnished the alter- nate dance numbers. we wy A oe ie ls Our photograph shows the apparatus, which was all constructed by its owner, Mr. Morton W. Sterns. This set delivers about 15 watts to the aerial, and has done remarkable work for this power having been reported in every state this side of the Mississippi River and has made two rec- ords in excess of 1300 miles. 2AB is sending out regular concerts on Friday evenings at 8 and Sunday mornings at 11 o’clock, and would be glad to have reports from stations over 100 miles dis- tant.

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2) T August, 1920 CALLS HEARD HE us received a number ntly, expressing dis- that the writers lists rd have not appeared want to tell you fellov ppens. All lists are filed | periodically certain of the: ff for publication. We have we can allot in QST to th ind we do not believe that th: d for one issue has ever | of the amount we have res ind. The lists in our office r ild be sufficient to fill severTra t ives in QsT! With such yr thru the best we can the selections pub- lished nbrace reports from every yuntry—it is mani- fest]; publish them all at once. W ir best to present all the int Be assured of our cord - your kindness in report f On a ist quantity of calls report k your co-operation ') ie on a separate sheet f pape ly them in a letter. (2) listricts from 1 to 9, and ru each district; and run t page, not down a | (3) ses around calls of stati (4 r other unauthorized Cail » riod covered by your 1AW RD, June 1—July 10 (1A CK), (1CM), 1DQ, 1FH, (1FQ IMX, 1SN, (18Z), (1TS), (1AE 1IFAQ, (1HAA), (1NAQ), 1TAZ AK (2A0O), (2BK), 2FS, GR 2YM), 2X%J, (2ZV), tEN. 31 NB), (8ZA). (3ZW). N : (8DA), (8ER), 8IK, w ARBOR, MICH. 1AT AV BM, 2DA, 2II, 2IR, 2L0. 2XG ' ZV. 3AA (Can.), (3AR Car I IDM (Can.), 3DR, 3EG (Car } . SXP, 4BZ, SBT, 5ED, YA I \ SAAI, 8AB, SABP, 8AG, SAH " 8AMN, 8AO, 8AP, 8AS, SAI 8BO), SBP, 8BR, (8CB), (8CI SDE, 8DF, (8DI), 8DO, gDV } R, SEX, SFD, 8FI, 8FS, 8FX, SGC. &GI ) iR, 8GY, 8GZ, SIE, 8IH, RIK } SKH, 8KK, 8KV, 8JJ, (SLA SMT, 8SMY, 80Z, 8PF, SPX I N. 8SF, STN, 8UW, 8VB, SVP. &VI WY). 8XC, 8SXI, 8XK, 8XU, SYI 8Z VY. SAK, 9AP, (9AU), (9CA), (9CE I OFH, 9HA, 9HJ, 9HN, (9HR), 9HW, QIT, SKF, (9KM), 9KV, SLC, (9LF), (9MH), 9MK, (9NQ), 9QJ, 9RP, 9UG, 9YA, 9YB, 9ZC, 9ZJ, 9ZL, 9ZN, 9ZT. 1ES, BROOKLINE, MASS. 1AW, 1CM, 1FQ, 1HAA, 1Ts, 1YB, 1ZA, 2BK, 2BM, 2BO, 2GR, 2JE, 2JU, 2LO, 20A, 2RB, 2TF, 2VA, 2XH, 2XX, 2YM, 8BZ, 3DH, 3EN, 3EV, 3EY, 3FG, 3GX, 3HJ, 3KM, 3NB, 3NV, 3ZA, 5CW, 8ABG, 8CB, 8DA, 8DC, 8DI, 8DY, 8EN, 8ER, SEV, 8FO, 8GB, 8HW, 8LA, 8MT, 8NI, 8PG, 8RQ, 8RS, 8VM, 8WY, 8XK, 8XU, 8YV, 9MH, 9ZN. 9LR, ANTHONY, KANSAS 4AG, (5AA), 5AC, 5AL, (5A0), SAP, 5BB, 5BM, (5BO), 5BZ, (5CD), 5CP, (5DO), (5EA), 5ED, 5EE, 5EO, SEW. SFL, 5SFW, SHB, SLL, 5SB, (5YA), 5YE, (5ZA), 5ZC, 5ZG, (5ZL), 5ZN, 5ZO, (5ZU), 5ZW, (5ZV), 6GQ, 6ZA, 8AA, 8DA, 8ER, 8GQ, 8RS, (9ACV), 9AJ, (9AK), 9AU, OBR, (9BY), 9CA, 9CI, (9CN), 9EE, 9EL, 9FL, (9FP), (9FU), 9GK, 9GM, 9GU, 9HA, 9HB, (9HI), (9HN), 9HT, (9IF), 9IV, 9JB, 9JD, (9JE), (9JN), 9JT, 9KA, 9KO, (9KV), (9LC), (9LF), 9LQ, (9MK), (9NE), 9NQ, 9OT, (90V), 9PI, 9QM, (9RP), 9SD, 9SV, 9UG, OWI, 9WU, 9XM, SYO, 9ZA, (9ZC), 9ZH, 9ZJ, (9ZL), 9ZN, 9ZQ, 9ZS, (9ZT), (9ZU), 9ZV, 9ZX. 6DH, FRESNO, CALIF. 5AC, 5ZA, 6AB, 6AC, 6AD, 6AE, 6AG, 6AK, 6KM, 6AT, 6AY, 6BH, 6BQ, 6BR, 6BS, 6EE, 6CM, 6CO, 6CQ, 6CV, 6DP, 6DY, 6EA, 6GEB, 6ED, 6EF, 6EJ, 6EL, 6EM, 6EN, 6ER, 6FE, 6FS, 6FU, 6GE, 6GH, 6GI, 6GQ, 6HM, 6HH, 6HZ, GIF, 61Q, 6JD, 6JE, 6JK, 6JM, 6JQ, 6JS, 6KP, 6KU, 6LE, 6MH, 6MZ, 6NL, 6ZA, 7BR, 7CC, 7CK, 7CH, TCW, 7CU, 7DF, 7VA, TYS, 7YB, 7ZB. 9FG, GOSHEN, IND. 1AW, 2ZS, 3ZR, 4AE, 4AE, 4AL, 5BT, 5YA, "YE, 5ZL, SAA, 8AK, 8BP, (8DA), 8DI, SEA, 8EB, SFI, 8FS, 8HA, 8HD, S8IC, 8IF, 81K, SLA, 8ER, SMB, 8NI. 8NZ, 8RK, 8XI, 8ZY, 9AA, 9AJ, SAP, 9AU. 9AW. 9BA, 9BG, 9BR, 9BY, 9CA, (9CI), (9DF), 9EE, 9ER, 9FD, 9FN, 9FW, 9GD, 9GS5, 9HD, 9HJ, 9HN, SIP, 9JW, 9KO, 9LF, 9LQ, 9MH, 9MV, 9PA, 9PR, 9PW, 9XM, SYA, 9ZJ, 9ZL, 9ZN, 9ZQ. 8NB, ROCHESTER, N. Y. 1AW, 1TS, 2DA, 2FH, 21R, 2JU, 2NR, 2QE 1AK, 2RM, 2ZL, 2ZM, 2ZR, 3EV, 3GX, 3NB, 3NH 3NV, 8AA, 8BB, 8BG, 8BH, 8BV, 8CH, 8CB, 8CO 8DA, 8EG, 8EN, 8ER, 8FO, 8GA, 8GS, 8HH, 8IK SKI, 8KP, 8KW, 8MU, 8MZ, 8NG, 8NI, 8PG, 8PP., 8QJ, 8SH, 8VM, 8XA, S8XK, 8XU, 8ZM, S8ABG, SRBG, 9AU, 9GB, 9LQ, 9MS, 9NB, 9XH, 9ZJ, 9ZN 6ED, SANTA ANA, CALIF. (6AE), (6AH), (6AK), 6AM, 6BF, 6BH, (6BQ), (6BR), (6CO), 6CP, 6CV, (6DA), 6DF, 6DP, 6DX, (6DY), (6EA), (6EB), (6EC), 6EF, (6EI), (6EJ), (6EK), (6EN), 6ER, 6EX, (6EZ), 6FA, 6FD, 6FN, 6FS, 6FT, 6FU, 6FY, 6GC, 6GH, 6GI, 6GM, 6GQ, (6HH), 6HO, 6HU, 6HY, (6IF), (6IL), (61Y), (63D), (631), (6JK), 6JM, 6JR, 6JV,. (6KA), (6KE), (6KH), 6KL, (6KP), 6LC, 6LQ, (6MN), (6MZ), 6NB, (6NY), TAD, 7DK, (7CC), 7ZB, TYB, TCU, 7TCW. 9ZT, MINNEAPOLIS, (Feb. 6AN, 5 AC, 6BS, (6AT), 6BU, 6CC, 5ZA, (6AY), 6CM, Ist—April 15th) 9AAH, 9AAN, 9AB, 9AC, (9ACV), (9AD), 9AE, 9AG, 9AI, (9AJ), 9AN. 9AS, SAT, SAU, SAV, 9AX. 9BG, (9BR), (9BT), 9BU, (9CA), 9CC, (9CE), 9CH, 9CN, 9CS, 9CT, 9CV, (9CW), 9CY, 9DB. 9DC, SDD, SDL, 9YDN, 9DO, SDT. 9DU, 9EA, (9EE), 9EK, 9FK, 9FL, (9FB), 9FG, 9FI, 9FU, 9FZ, 9GA, (9EL), 9ET, 9EX, (9FP), 9FQ, 9FT,

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August, 192 (9GC), 9GG, 9GI (9HQ), (9HT), 9IR, SIT, 9IX, 9JA, JQ, BJT, 9KG, 9KW, (9LC), 9 0 QsT 55 i, (9GK), (9GM), (9HI), ha 5 9HW, 9KI, 9HY, 9IF, 9IJ, SIL, 91 9JE, 9JI, 9JJ, 9JL, (9JN), (9KM), (9KO), 9KR, 9KV, LF, (9LH), (9LR), 9LT, 9LY, 9MC, (9MH), 9MM, (9NQ), (9NX), (9OB), (90E), 90G, (90V), 9PF, BZA, 5ZK, (5ZG) 2XB, 2XG, 1AW 9MS, (9MX), 9NG, 9NO, 5ZL, 5ZU, 3DH, 3EM, 38ET, SER, ST. MARY’S, O., May 19—June 21. W, 1HAA, 2BM, 2EJ, 2GR, 2JU, 22M, 2ZV, 2BZ, 3EN, (3HJ), LAK, (1AW), I1F 2TF, 2UE, 2VM (3NB), 3ZW, +: (SDA) (8DA), 8DV, 8EJ, 4AE, SRS, 8U0O, (SWY), (8 1), 9BW, (9CA), 9DP, 9GX, 9IX, SZW, 9AP. (9AT (9JN), 9KV, 9LM, 9M X, (NSF), XA3. The following were heard in daytime on June 6, 7 and 8: 1AW, 9ZL, (9ZN), 9Z SDA, 9ZN, NSF 4BZ, 4YA, 4YB, (5DA), (5YH), 5ZG, 5ZL, 8ADO, 8BJ, 8BP, (8CB), SFPD, 8FY, 8GS, (S8IK), 8IN, XA), 8XB, 8XK, 8YV, 8ZV, H, 9UK, 9UM, 9UU, (9ZC), 3EN, NORFOLK, during June. 1AW, (2BM), (3BZ) (3DH), 2GR, 3HJ, 2JU, (2RK), 2TF, 22M, 3IB, (3KM), 3NB, (3ZA), ZW (NSF, fone & CW), (4CC), 8BP, 8DA, 8DI, SER, SLA, 8WY 9ZN, and 9ZW (SXK, spk and CW), (8ZW), 3HJ, HAVERFORD, PA, June LAW) IBM, ({ (1TS) 2AJD, NSI (SABG), { (8VX (8ZW), 1CE), ( (2ANN), 2BR (dalite), (2CT ME), (2NP), (20A), 2RK, 3DG, (3DK), (3EN N HG), 31H (ew), (3JR), (3KE), 83QC, (3XF), Q SER), 9HR 1DU, 1FAQ, 1FV, SIN, (8JU), (8NI), (8R 9ZC, BAUDETTE, MINN. 2XG, 5AL, 5BT, 7ME, SAA, 8DA, 9A0O. 9AW 9AT 5DO, 5TU, 5ZA, 5ZC, 5ZG, TCC, (SER), 8FI, 8MQ, 8XK, (9AK), 1, «9 (9DH), 9DR, 9DT, (9 (9FZ), (9GC), 9HA, 9I1X, 9JA, 9JB, (9LC), 9LU, QI 9JE, WwW, 9 STU, 9UG, 9WW, ex (9ZJ), (9ZL), (9ZU), (9ZV) and (RCW of the Radio Cub of Winnipeg, Man 6CR, LOS ANGELES. ZA, 6AE, 6AK, 6CS. 6DK. 6DP 6GE, 6GK, 6GQ 6BJ, 6DS, 6HH AJ), 9BT. (9CS), 9DA, 9AF, EE), 9EX, 9EY, 9FA, 9FT, (9HN), 9HT, (9HW), 9HT, 9JR, (9KI), (9KF), (9KV), MH, ex 9MK, (9PI), 9RP, 9XN, 9YA, ex 9YG, (9ZN), 6BN, 6BQ, 6BR, 6CP, 6CQ, 6DY, 6EJ, 6EX, 6FE, 6FI, , 6TY, 6JL. 6JK, 6KC 6KM, 6KZ, 6MZ, 60H, 6QU, 6UM, 6XZ, 6ZA, 6ZE, 7CC. 2KV, BRONXVILLE, N. Y. Mar. 1—June 30. 1AE LAS, 1AV IDL, 1DQ, 1DR, V LE IDY IHW, 1JA, 1JAP, 11 (Daylight) iTS 2SZ (Daylight). 3DH, 3DO, 3DR, SEZ, 3FB, 3FG, SHG, 3HJ, 3IF, SOF, 80U, 83RK SVN, 3WF, 3ZA 8AJ, SAS, SSBB, SDD, 8DK, 8DR SGI, 8HH, 8HP, SPG, 8RS, 8SS, DD, 9FZ, SHA, 9ZV Canadian 2AJ sAW, 3DSs, 3FR, 3KM, SSB NSF, 8 BO, 3B, 1CK (Daylight), 1CM, , IFAA, 1HAA, 1HH,. 1HT, .D, 1NC, 10AL, 1RN, 1RZ W. 2BM, 2DA. 2FG 2TF, 8BE, 3BZ, 8CT, 3CK, 3CV, 3EE, 3EH, 3EN, 3EV, 3EW, 8FW, 3GI, 3GO, 3GV, 3GX, 3NB, 3NS, 8NV, 380A, 30B, 3SF, 8SJ, 3UE. 3UG. 3VA 4A0, 4AT, 5BS, 5DA, 5GA, 8BQ. 8CB, 8CE,. 8CT, 8DA, SDW, 8DY, 8EL, 8EN, 8ER, 8GB, SIB, &8SH 9IK, 2BF 8KZ, 8MQ, 8MT, 8NI, 80OT, SWY, 8XK, 8ZM, 9CA, 9CC, 9IT, 9KV, 9ZM, 9ZN, 9ZO, 8IK, ASHLAND, OHIO. 5AL, 5ZL, 5ZC, 5DO, 1AG, 4AA, 3BZ, 8CC, 3CH, 2DA, 2ZS, 2ZM, 2ZL, 2IR, 2JU, 2WB, 2CS, 2ZP, 2WP, 1AZ, 1AW, 1AK, 9's and 8's too numerous to mention. 8LF, CRAFTON, PA. (Indoor aerial. o ne 4 0 ft.-wire, May.), 1AK, 1AW, 1TS, 1HAA, 2BG, 2BM, 2BW, 2DR, 20A, 2QR, 2TF, 2ZL (spark and Mod.), 3BE, 3ED, 3EN, 3EV, 3FG, 8HJ, 3NV, 3PK, 3ZW, 4YA, 8BP, 8CB (Spark and Mod.), 8DA, 8DI, 8DZ, 8ER, 8FD, 8GC, 8HG. 8HP, 8LA, 8RS, 8TG 9BP, 9FW, 9HR, 9JN. STI, 8TT, 8WY, 9AFX, 9AMN, (9PI), 9PN, 9PS, 9PV, 9PY, 9QE, (9QV), 9QY, 9RB, ORF, 9RG, 9RK, (9RP), (9RV), (9RY), 9SC, 9SR, (9SS), (9SY), 9TA, 9TQ, (9UG), 9UK, 9UQ, 9VR, 9WD, 9WW, 9XA, 9XN, 9YA, SYN, 9YO, 9YV, 9ZA, (9ZC), 9ZJ, 9ZN, 9ZP, (9ZQ), (9ZU), (9ZV), (9ZX), 9AE, SAL, 8BB, 8BP, 8BV, 8CB, 8CD, 8CI, 8DA, 8DC, 8EA, 8EN (Heard at noon April 5th), 8ER, 8FH, 8FI, 8FP, 8GA, 8GB, 8HA, SHH, 8IF, 8JB, (8JJ), 8MB, 8NB, 8NC, 8ND, SNF, (8NZ), 8PJ, 8PL, 8PV, 8QI, (8QJ), 8RH, SRS, 8SS, (8WY), (8XA), 8XD, 8YO, 8ZG, 5AG, (5AL), 5BB, 5BG, 5BM, 5BO, (5BT), 5CP, 5DA, 5DG, 5DO, 5ED, (5EJ), 5EW, 5NA, 5YA, 5YE, 1AAU, PROVIDENCE, R. I. 1AE, 1AW, 1CK, 1CM, 1FQ, 1GAI, 1HAA, 1JP, INR, 2BM, 2BK, 2DA, 2EV, 2GR, 2IT, 2JU, 2L0, 2RM, 2TO, 2VA, 2XH, 3BB, 3BH, 3EN, 3EV, 3GK, 3HJ, 3NB, 3ZA, 8BB, 8BQ, 8DY, 8EN, 8EV, 8FC, 8GI, 8H, 8IK, 8KX, 8LA, 8MT, 8PP, 8WY, 8XU, 8ZV and NSF. iTS, BRISTOL, CONN., May 18—June 20. (1AAT), (1ABJ), 1AE), (1AK), LAS, (1AW), (1AY) spark, mod. c. u & fone, 1IBAY, (1BB), (1BBL), (1BG), 1BM, 1CAO, 1CC, 1CE, (1CK), (1CM), (1CZ), (IDAB), 1DAL, (1DQ), 1DR, (1DY), (LEAV), (1ED), (1EK), 1EP, 1FQ, (1FV), IFW, (1GAI), (1GP), (1GY), (I1HAA), IIL, (11S), 11W, (1KAY), (1KAZ), (1NAQ), (1NAT), 1QN, (10P), spark, mod. c. w. & fone, (IRV), (1RZ), (1SAS), 1SAZ, 1SE, (1SN), (1SZ), 1TX, 1UAF, 1iWP, (1YB); 2ABM, (2ANN), 2BA, (2BK), 2BM, 2CL, 2CM, 2CS, 2DR. 2EV. 2FB, 2FG, (2GR), (2JE), (2JU), 2LO, 2ME, (20A), 20M, 2PL, 2QR, spark, c. w. & fone, 2QV, (2RB), 2RM, 2RU, 2SZ, (2TF), 2TS, 2VA, 2XJ, c. w. & fone 2ZE, 2ZL mod. ec. w., 2ZM spark, straight & mod. c. w., 2AIM, (2AJD); 8AN, 3AQ, 3BZ, 3DH, DR, 3DS. 3EN, 3EV, 3FB, 3FG. 3FN, 3GV, (3HJ), 3MU, (3NV), 30B, 3PR, (3NB), 3ZA, 83ZW, 8ABG, (8BB), 8BP, 8BQ, 8BV, 8CB, 8CD, (8DA), &8DI, 8DY, 8EN, 8ER, 8FW, 8GB, 8GQ, 8GS, 8HA, (SHP), 8IN, 8JY, 8KZ. 8LA, 8LJ, 8MM, 8NI, 8QJ, 8SH, 8TT, (SWY), 8XK spark, mod. c. w. & fone, 8XU, (8ZW), 9AU, 9HR, 9ZN. 9LU, MORRISON, ILL. “NSF”, 2ZS, 2ZM, 3BZ, 3EN, 3HJ, 3NV, 3NZ, BC, 5A0, IBT. 5CP, 5DO, 5YA, 5ZL, 5ZP, 5ZW, SAA, 8AM, 8CB, 8CI, 8DA, 8DE, 9DG, 8DR, 8DS, SEN, 8ER, 8FH, (8FI), 8GB, 8CJ. 8HD, 8HH, SIA, SIF, 8IK, 8IU, 8IS. 8JL,. 8JO S8KP, 8LA, 8LH, 8LS, 8MY, 8NF, 8NI, 8NT, 8NZ, 8PP, (8QJ), 8RA, SRY, SRS, 8ZS, 8XA. 8XK,. 9AJ. 9AF. 9AK, SAT, 9AX, 9AU, 9AW, OBA, 9BE, 9BR, 9BP, (9BY), (9CA), 9CE, 9CN, (9CS), 9CW, 9DR, (9DC), (9DT), 9EE, 9EQ, 9ET, (9EZ), 9FA, 9FG, 9FU, 9FZ, 9GA. (9GM), (9GC), (9GR), 9GF, 9GS, 9GP, 9GX. 9HN, 9HA, 9HJ, (9HK),. 9HT, S9HD, 9HI, 9HW, 9HR, 9HM, (9IA). (9IX), 9IJ, SIT, 9ID, 9JT, (9JN), 9KF, 9KK, (9KI), (9KY), 9KV, 9KQ, 9KL, 9KX, 9KM, 9LC, 9LV, (9LF), 9LR 9LK 9LA, 9LX. 9LI. 9LO, (9MS), 9ME, 9MT, (9MN), (9NQ), (9NV), 9NY, 9NX, ONE, 9OK, 9OE, (9PZ), (9PI), 9PV, (9QI), 9QJ, 9QQ. ORK. 9RP. 9SJ, 9SS, 9SC, 9SU, 9UW, 9UK, (9UG), 9VA, 9WD, 9XM, 9YA, 9YB, 9YO. 9ZJ. 9ZN. 9ZS, 9ZU, 9ZT. 9ZL. 9ZK, 9ZG, 9AAV, 9ABN, 9ACN, 9AFB, (9AFF), 9NNA. 9QJ, ST. LOUIS, May 15—June 15. SEN, 4BZ, 4AZ, 5AC, 5AL, IOA, 5YA, 5ZA, (SER), (8DA), 8DI. (8LA). 8MI. (9AU). (9CA), (9CE), (9EL), (90S), (9HM), (9HM), (9KM), (9MH). 2TF, SCHENECTADY, April 27—June 10. Stations worked: 1AK, 1CK, 1DR, 1DQ, 1DY, 1FV, iSN, 1TS, 1VB, 1KAY, 1IHAA, 2BK, 2GR, 2JE, 2PL, 2UE, 3AK, 83HJ, 3JR, 3NB, 3NC, 3NV. 8ABG, 8SBB, 8CB, SCE, 8DA, 8DV, 8EN, 8WY, 8MT, 8XU. Canadian 2AS and 2BF. 6CO, SAN JOSE, CALIF. (6BQ), (6CM), (6CS), (6DA), (6DH), (6EA), (6EB), (6EB), (6EJ), (6EK), (6EN), (6ER), (6EZ), (6FD), (6FE), (6FU), (6GH), (6GI), (6HH), 6HK, (6HZ), (6JD), (6JI), (63M), (60H), 6ZA, (7CC), (7CH), (7CR), (7CU), (7CW), (TDK), (7ZB), (7YS).

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You Ordered Yours Yet ? distribution—the new A.R.R. L. Emblem, officially adopted as the device of the League, as told Editorially in the July issue of QST. Every member of the A. R.R.L. wants an Emblem. Wear this to let the fellows know that you are an amateur it is fast becoming the universal means of identification. Vhen you see this pin on a man, you know he’s all right— e’s am amateur; more than that, a brother member of the R. R. bs avy rolled gold and black enamel, three-quarters of an inch high. specify Now ready for Furnished either pin or screw-button (lapel) mounting. In ordering which yo $1.50 SECRETARY, AMERICAN RADIO RELAY LEAGUE, 61 Waverly Building, Hartford, Conn. Postpaid 1 BARGAINS IN BAKELITE TUBING! Bakelite 1 is the ideal material for winding your receiving tuners, inductances for C.W.., t does not warp or shrink or change its form, and is the best possible insulator »oses of this mature. We have been fortunate in securing a supply of this t hich we can offer at the following low prices, postage prepaid: Outside Diam. Inside Diam. Price Per Foot 2a” 2 - $1.50 314” 3%” 2.50 3%,” 34,” 1.00 54%,” S ot 1.50 This tul finish (brown), and comes in 3-foot lengths. Lengths of 1 foot or more supplied harge, but add 25 cents cutting-off charge for each separate piece desired under 1 Cc. D. TUSKA CO., t-2 t-2 t=: Hartford, Conn. Come to Headquarters for Wireless Books When books that really teach—the kind that meet the requirements of engineer irs—Radio schools & Government departments come to us. Practical Wireless. Telegraphy Vacuum Tubes in Anes One By E. E. Bucher Wireless Communication > ' ee aTEt Cloth, 352 Pages, By E. E. Bucher PRA‘ . : ATEUR 340 Illustrations. Cloth, 184 Pages, WIRE! ATIONS Price $2.25 Fully Illustrated. An Exp Rook Con- - Price $2.25 taining Sugges- How To Pass VU. S. Govt. ———_—— tions of Three Ex- Wireless License Examinations How To Conduct A Radio Club periment Building, By E. E. Bucher By E. E. Bucher Installin Operating Paper, 96 Pages, 148 Pages, Fully Illustrated. Experim stions for Fully Illustrated. Price 75c. Radio ¢ ation Price 75c. Compiled Editor of SAVE A year’s subscription to THE WIRELESS AGE may be THE WI AGE. included with book order at only $1.50 additional. Regular 136 Pag per. Price 50c price $2.00. 75c, Prof Illustrated. (Postage on subscriptions outside U. S. 50c extra.) mac ——“_ WIRELESS PRESS, Inc., 328 Broadway, New York 56 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Radio Progress Progress in Radio means the efficient elimination of unnecessary, old and inefficient apparatus and in producing instruments full of life and vigor, quality, workmanship and service; some- thing necessary to the modern station of today; something that is an improvement over the old methods :—the A. R. Co. Amplifying Transformer is distinctly a step forward, a step towards the goal of efficiency. In designing this piece of apparatus, particular reference was given to the correct ratio of impedence and turns be- tween primary and secondary. Another feature which makes this trans- former a desirable piece of apparatus, is the simple but very effective mounting of bakelite strips, supporting the laminated closed core and coil, which allows for quick mount- ing in case or on panel. The primary and secondary leads are indicated by engraving on the bakelite mounting strips. The price does not do justice to the reliability and high service quality of this product. A-4 Amplifying Transformer, list price $5.00 does not include carrying charges on one pound or duty paid for use in Canada. RADISCO AGENTS carry only apparatus of proven merit. Look for the Radisco trade mark on all parts you buy and be sure of getting efficient apparatus. Below are listed a few of the reliable firms who carry Radisco products; A. R. Co. Amplifying Transformers and are our agents for all other standard apparatus of merit. Communicate your wants to them ALBANY, N. Y. E. L. Long, ATLANTIC CITY, N. J. Independent ary soupely Co. 21° Magnolia Terrace . New Jersey Ave. BALTIMORE, MD. Radio Engineering Co., 1 BIENVILLE, QUEBEC, CAN MASS. Atlantic Radio Co. 4 No. Calvert St. Canadian Radio Mfg. BOSTON, 88 Broad Street BROOKLYN, N. Y. Kelly & Phillips Electric Co., 312 Flatbush Ave. BRONX, NEW YORK Amateur CHICAGO, ILL. Chicago Radio Laboratories, Wireless Equipment Co., 1390 Prospect Ave. NEWARK, N. J. A. H. Corwin & Co. 4 West Park Street NEWCASTLE, PA. Pennsylvania Wireless Mfg. Co., 507 Florence Ave. ‘8SHA” PHILADELPHIA, PA. Philadelphia School of Wireless Tele hy, Broad and Cherry Streets Co. PROVIDENCE, R. 1. Rhode Island Elec. Equip. Co., 45 Washington Street PITTSBURGH, PA. Radio Electric Co., 3807 Sth Ave. SEATTLE, WASH. Northwest SCRANTON, PA. Shotton Radio Mfg. Co., Radio Service Co., 1801 Sixth Ave. 1316 Carmen Ave. P. O. Box 3 EUREKA, PEORIA, ILLINOIS Branch, 8 Kingsbury St., Klaus Radio Co. Jamestown, We KANSAS CITY, MO. McCreary mace, iuarly. LOS ANGELES, CALIF. The Wireless Shop, & Delaware Sts. 511 W. Washington St. MONTREAL, CAN. J. B. Miller, 1 McKEESPORT, PA. K. & L. Electric Co., 427 Olive Street NEW ORLEANS, LA. L. A. Rose, 121 Camp Street Responsible dealers: 600 Hutchison St. SPRINGFIELD, MASS. Electric Service Co., 585 Armory Street ST. LOUIS, MO. The Benwood Specialty Co. 3424 Olive Street TORONTO, ONT., CAN. The Vimy Supply Co. 585 College Street WASHINGTON, D. C. National Radio Supply Co., 808 9th St., N. W. WICHITA, KAN. The Cosradio Co., 1725 Fairmount Ave. Write for interesting sales proposition on Radisco apparatus If none of the above agencies are in your vicinity, communicate with RADIO DISTRIBUTING COMPANY, Newark, New Jersey a ~ 57 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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A Good Wavemeter AT A MODERATE PRICE TYPE B Bulletins Z grade, m R lists th« Q. WAVEMETER ind F sent for 4c Stamps list our complete line of high is accurate simple and rugged. Comprises a portable oak case 53%,” x8%4” x6" with hinged cover, bakelite panel, balanced condenser, buzzer, detector, switch, binding posts, and two 2 unit inductance windings, range 200 to 2000 meters. Price $27.50 These meters are in stock for im- mediate delivery and are carried in stock by most good dealers. tely priced apparatus for the radio laboratory. Bulletin bridge Rectifier for Storage Battery Charging. CLAPP-EASTHAM CO., 114 Main St., Cambridge, Mass. 58 SEVERAL SIZES SPECIAL | WORK. | {Il —— — a [BURGESS'B" BATTERIES FOR i ] Mt i Senp FOR CATALOGUE BURGESS BATTERY COMPANY HARRIS TRUST BLDG.- CHICAGO, ILL, Radio Amateurs We carry in stock a complete line of the following Manufacturers: J. H. Bunnell & Co. Acme Apparatus Co. Wm. J. Murdock Co. Tremaine Mfg. Co. DeForest ADDRESS ALL MAIL ATTENTION OF MR. H. DUNBAR Quaker Light Supply Co. 728 Arch St., Phila., Pa. = ALWAYS MENTION QS 7 WHEN WRITING TO ADVERTISERS

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Licensed by DeForest AUDIOTRON The Original Tubular Vacuum Amplifier The AudioTron vacuum tube is now manu- factured and sold as a genuine audion licensed under DeForest Patents Nos. 841387 and 879532 to be used only for amplification in radio com- munication and only for experimental and amateur purposes and only in audio frequency circuits. The Audiotron has a double filament of special thorium tungsten and the operating life is over 2000 hours. No special socket is required. The electrical and mechanical dimensions result in a heavy plate cur- rent and corresponding signal strength. Plate voltage under 40. Our guaranty insures satisfaction. PRICE $6.00 EACH If your local dealer cannot supply you we will ship postpaid when cash accompanies order. The AudioTron Exclusive Guaranty: Each and every Audiotron is guaranteed to arrive in good condition and to prove fully satisfactory. Replacement of unsatisfactory tubes will be made free of charge. AUDIOTRON AUDIO-FREQUENCY TRANSFORMER......... $7.00 Laminated closed core, two coil type. DEALERS:—Write for our attractive trade Proposition. AUDIOTRON SALES CO. Lick Bldg., San Francisco, Calif. ——— ——$$—__ >» — om — — ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS a

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“SHRAMCO” Specialties are needed for an efficient set Switch Points BRASS NICKEL Per 100 Per 100 $2.00 $3.00 No. 626 re ee eee No. 627 id, 54” shank, with nut and washer...............- 2.25 3.35 No. 628 See ess Ue 0b 0 op bbe sb.ve & Sp we bb RS Oe 1.75 2.60 Switches EACH DOZEN No. 750—La Knob, Phosphor Bronze Blade, With Bushing, l FOGNED « 00 6 hbk 0.646 ee chk wee 6608 80 TE O46 be COR 4 $0.75 No. 751—S » Baadin, FU Ce I CIA, ng ccc ca ccsciscece 0.35 No. 800—Pa eee i, as co anew sh toseeneone 0.10 $1.10 No. 600 .” Brass Binding Post, brass finish, screw and washer.... .06 .65 ete line reliable moderate priced apparatus. R \gency, Coils, “B’’ Batteries, Dial Indicators, etc. va Send 5c in stamps for Catalog J showing complete line. Shotton Radio Manufacturing Company P. O. Box 3, SCRANTON, PA.

PARKIN RHEOSTAT $1.00 POSTPAID When _this is covest mounted, smoothest Vacuum Tube Socket TYPE 156 Wins ’ — = = _ — = = = = = = = = = —< = =< = |

Positive contact springs Base is of moulded bakelite Metal parts polished nickel Adaptable to either transmitting or receiving tubes

al Size) . No. 35 PARI \NEL TYPE RHEOSTAT Price ° . $1.75 20) has easily renewed Latest bulletins sent « on a request ( Patented Mar resistanc« t on back of MOULDED ft is moulded into knob, BAKELITE "KD ft ji cannot come FF" position provided. e_fne, adjustment General Radio Co.

860 degre rot Write pty des reular of audion panels, switches, — es ~~. WINDSOR STREET enle ° 1 proposition. . amare BPG. CO. San Rafael, Calif. Cambridge 39 Massachusetts ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS 60

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ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS TE ia NSTiTv 899 BOYLSTON ST. BOSTON, MASS. Another Open Letter ! ! It may be possible that a number of the readers of Q. S. T. are not familiar with the splendid RESULTS accomplished by the EASTERN RADIO INSTITUTE during the last few years and with your kind indulgence I will endeavor to outline them. During the period that the United States was at war this Institute gave training to over seventeen hundred (1700) different students in preparation for the Army and Navy where Radio and Telegraphy could be used to advantage. Moreover as a result of this the United States Government recognized this Institute as a necessary industrial war enterprise for the successful conduct of the war. The calibre of instruction offered is so thorough and efficient that it was possible for our graduates to actually secure ONE HUNDRED PERCENT efficiency in the Commercial operator’s first grade examina- tion. When one realizes that a number of applicants who are not fortunate enough to have our instruction fail to even pass this Commer- cial examination one can readily appreciate the value of our instruction. When you take into consideration that the Institute was founded in 1913 and has specialized on the training of Wireless operators for over seven years we feel that we know how to give the student proper training. The number of students to whom we have given instruction at this date numbers over four thousand (4000). We have actually enrolled, graduated and placed more Commercial operators than ALL the Radio schools in New England combined! If you are considering taking up Commercial radio why not let us train you? Our rates of tuition are reasonable and it costs you no more to avail yourself of our YEARS of RESULTS and SUCCESS. Just remember—We have trained thousands before you and have placed all our graduates in good positions. Our Fall Classes will start about the middle of September. Watch the next Q. 5S. T. for the opening date! Prepare your enrollment today. Our latest, illustrated prospectus is yours for the asking. If there is anything I can do to assist you in any possible way just drop me a line. Co-operatively yours, F. D. PITTS, Director. Series No. 2

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SEALS BUT NO SECRETS AND SERVICE C.R.L. Paragon Regenerative Receiver. hort Wave Regenerative Receiver is sealed for your protection, not ours. The r two year unconditional guarantee, showing our confidence in the set and Fu nnection and operation with each instrument. The C.I has solved the summer relay problem! I ' nal Armstrong U. S. Patent No. 1,113,149 and U. S. Application Serial No. m, PH, Ge ote ces edcboewttheves $55.00 Write for our descriptive Bulletin J-20. CHICAGO RADIO LABORATORY 5525 Sheridan Road (Testing Station 9ZN) 1316 CARMEN AVE. CHICAGO, ILL., U.S. A. CHO }O-CO-O-OHOHOHOHOHOHOHOHOHOHOOHOHOH 1D UCK’ &, New Big 200 PP. Wireless and 100 PP. Electrical Catalog 200 page exclusive wireless catalog mailed for 12c¢ and our eal catalog mailed for 6c, in stamps or coin. The largest, t elaborate and most complete radio catalog published. ything in wireless worth while is listed in this catalog. The experienced r will tell you to see our catalog before buying. You are thereby insured against an hase. It is the Beacon Light to guide you right in the selection of your wire- less apparat eer or better values are obtainable elsewhere. THE Wil LI AM B. DUCK CO. 243-245 —. St., Toledo, Ohio * Radio Electric Adebters Postpaid - - $1.50 PITTSBURGH AMATEURS and others are in- vited to call at our new store and inspect the latest radio instruments. Send 10c for our new catalogue. “We make or sell Everything Radio” The Radio Electric Company 3807 Fifth Ave., Pittsburgh, Pa. 62 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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RADIO APPARATUS Distributors of Reliable Radio Apparatus for Schools, Colleges and Experimenters in Every Branch of the Radio Field “PITTSCO” EIS REMEMBER! The Sign of Service! frm C We carry Se All we ask is a trial! 6 0 mmense Stoc y x Order Today! TRANSMITTING TRANSFORMERS CONTINUOUS (Latest Type) WAVE POWER TRANS. Acme 250 Watt unmounted $13.00 (For Wireless Tetephene Were? . Acme 50 Watt unmounted. Acme 250 Watt mounted ....$16.00 Acme SO Watt mounted Acme 500 Watt unmounted ——S UC Acme 200 Watt unmounted. Acme 500 Watt mounted... . .$22.00 Acme 200 Watt mounted. a eo ee yo MODULATION TRANSFORMERS Acme 1000 Watt mounted (For Wireless Telephone) Acme A-3 unmounted TRANSMITTING CONDENSERS Acme A-3 semi-mounted pes Acme A-3 mounted (Dubilier) Type Power Volts Cap. Price HONEY-COMB COILS D-100 % K.W. 10000 .007 ....$19.00 F ‘ | D-101 Vy K.W. 14000 .007 ....$30.00 Litzendraht Wire. (While they last) . LL-75 330-1030 meters D-102 1 K.W. 21000 d ...-$45.00 LL-100 450-1460 D-103 1 K.W. 25000 [_ Te . LL-150 660-2200 D-150 8000 A w LL-200 930-2850 : : LL-250 1300-4000 Suitable for spark coils. LL-300 1550-4800 AM-888 Line protector a LL-400 2050-6300 LL-600 4000-12000 ae 5000-15000 SPARK GAPS -1000 6200-19000 LL-1250 7000-21000 $3.90 Amrad Type G-1 ‘ Note:—These coils are genuine DeForest Litz Amrad Type G-2 * : coils. Amred Type G-3 REGENERATIVE RECEIVERS Benwood Rotary-quench .. Hayward “Little Wonder”. Any tone; runs No. : CR-1 Grebe, 170 to 600 with tube con SS 6 VES & BES AS & OL... No. CR-2 Grebe, 170 to 600 meters.... No. CR-3 Grebe, 170 to 600 meters (new type just out) OSCILLATION TRANSFORMERS No. CR-4 Grebe, 170 to 600 meters (with series condenser) No. Y-200 Clapp Eastham, Large, from No. CR-6 Grebe, 170 to 600 meters Ye K.W. and up — d with detector and 2 step amplifier No. TXL-101-A International, self contained . , K.W No. CR-7 Grebe, 500 to 20000 meters 2 No Y-100 Clapp-Eastham, up to ¥ KW, $14.00 Neto-Each receiver is a creation in work- No. 424 Murdock... . manship and performance. Important ! Every article listed sent to any part of the United States postage or express prepaid. We want your business ! (Keep this page and watch for next month’s) SEND 6 CENTS IN STAMPS FOR NEW CATALOG ! F. D. PITTS CO., INC. 12 PARK SQUARE, Dept. A, BOSTON, 11, MASS., U. S. A. ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Thordarson Electric Manufacturing Co. 501 S. JEFFERSON STREET CHICAGO, ILL. 800 Miles on 1-4 K.W. ls the distance claimed by F. M. Prencil (9CF), 174 N. Scoville Ave., Oak Park, lll. Who will be the first to transmit 1000 miles on this ‘4 K.W. transformer > Send your records to this office. Power Factor 91% WRITE FOR OUR NEW CATALOG “T-21” EFFICIENCY ECONOMY ADAPTABILITY Bulletin C-110 on Request Radio Equipment Company 1525 N. FAWN STREET, PHILADELPHIA, PA. NOTE: We Only Sell Vacuum Valves Licensed Under The Fleming Patents. On account of w wal from the amateur radio , P game, I offer for my new Grebe Synchronous Have you tried DeForest Honeycomb coils? oe ; anal a Used A trial gives surprising results—and the Complete with ) step-up transformer for more you use them the better you like them. operating synchronous motor (220 v.). Price, $100 S. J. Metzler , F.0.B. New York City. ‘ — (ae. es oe eee NAPANEE, ONT: 2261 Chatterton A Bronx, N. Y. Clapp-Eastham DeForest BARGAIN CANADIANS Motors Very High Speed Practically noiseless—For D hoppers for C.W. or Phonographs. Rotary Gaps, ‘ Farmington Shelton Electric Phonograph $12.50 Ea-h than half price) DAVID L. MOORE tet Conn. 64 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS >i

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WE CAN NOW MAKE IMMEDIATE SHIPMENT OF “Brown” SUPER SENSITIVE RADIO PHONES Latest Improved Adjustable Steel Reed, Cone Diaphragm Type, Light Weight, 10 Oz. The Mo:t Comfortable and Most Sensitive Phone in the World. British Admiralty Standard 4000 OHMS - - - $20.00 8000 OHMS - - - $22.00 Resistances from 5 ohms to 24,000 ohms, on special order Rawson Electrical Instrument Company CAMBRIDGE 39, MASSACHUSETTS ; ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Acme Amplifier $13.00 Acme Detector $10.00 The ACM [PLIFIER shown in the cut sells for a price on htly greater than the retail price of the indi arts, which include an Acme A-2 Amplify ansformer, Tube Socket, Filament Rheostat Oak Box, Engraved Bakelite Panel and Bin ts. The AC} TECTOR is mounted in the same way and includes a Condens Grid Leak in place of the Amplifying Transformer. COMPACT ATTRACTIVE SHORT CONNECTIONS 3y con! ijacent binding posts of two Amplifier units side by side a ty amplifier is obtained with separate filament control and san B batteries. A Detector may be added to either one or two th the same ease of connection. ACME APPARATUS CO. 26 WINDSOR STREET, CAMBRIDGE 39, MASS. “ASK A HAS USED IT” USER RE PROVERS “My Brat rought in Coast statior earer than the othe r pn which the station was sup Name on Request). BRANDES WIRELESS HEADSETS ™ Navy oct Sid * Transatla ohms $ Superior” 2000 ohms $7 TRIAL les Wiretess Receivers against arty lest them for sensitiveness OFFER y slance. If within ten days you shed but enthusiastic over them hack money without a question. Prowe for u oe quality, the * * matched tone.”” The tux s, tones —— -~ ae 3 the signals and ng by Government ex: perts eae i *- and technical sch professionals and amateurs everywhere SE) CATALOGUE F . BRANDES, Inc. Room 6821 sion Square, New York WIRE ER SPECIALISTS QST DE ACE LETS SING (TUNE, Battle hymn of the Republic) Mine ears have heard the signals From a dozen different lands From Greenland’s icy mountains To Sahara’s burning sands From the land of cherry blossoms To where Mount Sorata stands. And I’ve learned a thing or two. CHORUS Q. R. X. I’m going to tell you Q. R. X. I'm going to tell you Q. R. X. I’m going to tell you How you can get them too. This spasm continued next month. Watch our ads., they are “different”. So are our instru- ments. Its to our mutual advantage to get acquainted. “You may pay more, but you can’t buy better.” DEALERS. If you don’t stock Ace equipment you are missing a good line. THE PRECISION EQUIPMENT CO. Dept. D. 2437 Gilbert Ave., Cincinnati, Ohio. ALWAYS MENTION QS T. WHEN. WRITING TO ADVERTISERS | 2 |

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NECESSARY FOR ) AMERICAN RADIO RELAY LEAGUE ) LONG DISTANCE TRAFFIC To receive weak signals from distant A. R. R. I stations, one or mcre amplifying tubes should be used with the detector tube. The A-P VT Amplifier Oscillator has the highest amplification constant f any vacuum tube known to the radio art l} The A-P VT Amplifier-Oscillator The A-P VT Amplifier-Oscillator, is the Navy type SE 1444 “hard” tube, designed and manufactured expressly to furnish amateurs and experimenters an efficient tube particularly suitable for amplifying weak messages from distant A.R.R L. stations Because of its ex- ceptionally high vacuum and correct electrical and mechanical conan, this A-P tube has the highest amplification constant of any tube known to the radio art. Recent United States Navy Tests have est: ‘bile hed this fact conclusively. (See April 1920 Pro.I.R-E.) In conjunction with the A-P VT Amplifier- Oscillator best result s are obtained in A.R.R.L. long distance traffic by using the -/ n the original tubular vacuum valve brought out by our Ne tories in 1915 but now supplied with the SHAW standard four-prong base for convenience. Of all vacuum tubes, the A-P Electron Relay is the most efficient spark receptor. A combination of two or more VT tube “Ss as ampliiie rs with an Electron Relay as the initial detector is the receiving combination for long distance reception. THE A-P PERFECT VACUUM TUBE COMBINATION DEALERS The A-P Electron The A-P VT Amplifier- AMATEURS | Relay—price $6 each. Oscillator—price $7 Write for prices Immediate deliveries. each. Immediate Write for descrip- | rder from your _ deliveries. Order from tive literature dealer or write direct. your dealer or direst. ; and particulars. These Tubes were manufactured under the DeForest Audion and Fieming Patents } ATLANTIC oro, 2) SUPPLIES CO. 8-KIRK PLACE—NEWARK—N. J.—PHONE MARKET 1575 PACIFIC RADIO SUPPLIES CO. 638 MISSION ST.—SAN FRANCISCO—CALIFORNIA Reference — The American National nk, San Frenei SOLE DISTRIBUTORS FOR MOORHEAD LABORATORIES, Inc ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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MURDOCK 2000 OHM DOUBLE SET $4.50 3000 OHM DOUBLE SET $5.50 Made for tong and Useful service in Radic stat Dependal CPeretter Crhoice of se who ss GOOD ORDER Yy R SET NOW— Try it thoroughly. IF IT DOESN’T SUIT, SEND 1s where their and sensitive ; k es them the ‘phones. IT BACK AND GET YOUR MONEY Bulletin vs a splendid line of t of apparatus you want for a copy. | WM. J. MURDOCK CO. | 65 Carter St. CHELSEA MASS. 221 SECOND SAN FRANCISCO, CALIF Indicating QUALITY The Corwin Indicating Dial recognized by Radio Men as a popular and needy addition to any set, has been further im- proved and now comes in two sizes, three inches and three and seven eigths inches in diameter. This larger dial (37% in.) fills the general demand for an indicator to fit the standard one-quarter inch shaft; quality and workmanship better than ever. 3 in. dial only, 75c. With knob $1.30 37% in. dial only, $1.00. With knob $1.70. Sent postpaid anywhere. For sale at all Radisco Agencies Ten cents brings our latest catalog to you, describing the above dial and all standard radio apparatus A. H. CORWIN & CO. Dept. D.4, 4 West Park St. NEWARK, N. J. MO MMMM c SOVQNHUNNUUPOOOOUEUOYONONNNNUROOOUTOYANOOSUOSUETOOUTOOOANGMAUGEROOOOGANUANONRE LUO AA LENE WAOMPAUUUULESUNNNUSN002400000GNNDUOEONUIIOUANNSSUUUUDSNONOUOOONSANDDOOONUOOEENR SAS ULL UA UOPOAOOASOAEUOOCONAOTO COON OO UA AANUUOUONAAUOUNANAA UO EGAN AAESAAA AEGAN AUTON AUTAGAH GAA SGU NAAN AAA EASA MAA AMMOEPO CROAT ETA et 44} OPRDOL NoMa AERO PIAGDA AAD EDO POD feted ide tR EE Md 68 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS >

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qT panel DeForest sists of a Tuner with Set is the most com- receiving apparatus ever put out under $175.00. The entire set of 15 additional necessary =DE f Wy FORE S las HE typical 15 Unit Receiving shown here con- wave length range 150 to 25,000 meters ; a crystal an audion de- tector, and a one- step amplifier. This and efficient with some equipment, total! only $162 64. Each Unit be bought separ- ately at its in- dividual price Our Manual gives details DE FOREST Unit Receiving Set Gives You Better Apparatus at Low Cost E FOREST Unit Receiving Sets offer the most practical system of securing accur- D ately designed, and highly efficient receiving apparatus without paying fo. expensive factory assembly and costly cabinets. You buy the individual instru- ments each mounted on a panel, and assemble and wire them yourself. You can start with a few Units giving you a Receiving Set of efficient but simple type, and build up, always fitting new Units into the system as additions to the old. You can even fit these Units into any system you may now have. For the Amateur, Student or Experimenter, this Unit System is the most instructive because in using your own ingenuity in assembling and wiring the Units you will greatly broaden your Radio knowledge. There are many possible combina- tions and you should Send for the DeForest Radio Manual which describes the Unit System in full and also contains much valuable general Radio material. Send 10 cents for a copy at once. > E FOREST Radio Apparatus is DeForest Radio Tel. & Tel. Co. D®ZO"8S™ Bacio Apneratus is Inventors and Manufacturers of Dealers in all cities. Ask your High Grade Radio Apparatus dealer to show you these Unit 1407 Sedgwick Avenue New York City Sets. LEE DE FOREST, Incorporated, 451 Third St., San Francisco, Cal. WESTERN DISTRIBUTORS Shipments made from San Francisco Stock. SSS Re SSS Wan 0Fh IRE ST: eS 69 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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G. A The tremend production “ extended to t consistent w For the ben said that th than that Moreover, th low vacuum SIGNAL COR NAVY TYP Of Brookly: has been $35.00 : —ve e with 6-foot moisture-proof cord attached. oH Tested for matched diaphragm tuning and 2 Step Am} her, Same as Above operating qualities in actual service before Nickel Fittings $35. 00 Worth $60.00 ohipment. ee | own. station—astisfaction guaranteed. or Your own By ny ~ ae guaranteed or your Grid Condensers..... 3 refunded return of set. Write —— for Bulletin 1106 giving full particulars. Stromberg-Carlson Telep Telephone Mfg. Co. . Chicage,, I. Kansas City, Me. Toronte Ont.

70 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Write for Descriptive Circular of Our Various Types of Panels. TYPE “M” $48.00 Full Line on Display at Our New York AGENTS American Electro - Technical Appliance Co. 235 Fulton St., N. Y. City. TYPE “H” $38.00 Full Line of Commercial and Amateur Radio Supplies. VACUUM TUBE DETECTOR AND TWO STAGE AUDIO FREQUENCY AMPLIFIER NOLA RADIO CO. NEW ORLEANS, LA. ARTHUR H. KOPPER, Pres. Dealers Write for Agency. Good Territory Open. TWO STAGE AUDIO FREQUENCY AMPLIFIER ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Hook ’er to yer bulb The most wonderful tuner in the world for only $15. Last month this tuner beat in a test one of the NAVY STANDARDS at Ketchikan, Alaska. 10 Captains of Ocean going ships have had their wire- less operators install one of our tuners in the captain’s cabin so the exact time by wireless can be had with- out using either tube, bell, or hand. GREAT says one old sea dog. WHAT IN SAM HILL WILL YU MART ALECS GET UP NEXT? E stations copied in day time and no fancy aerial is n \ single wire about 40 long by 25 high will do the trick. London amateur W. R. Wade, Clift tol, promises report for the magazines to publish showing how the amateurs there read our s mn England. Junk your funny wound coils and get a regular two pound tuner that you can use du ¢ e static season. 20000 meters maximum wave length. Hook up on bottom of tuner. KNOCKED DOWN AND ASSEMBLED CONDENSERS. Which kir want???. Made for panel mounting and are complete with scale pointer and knob. Used all o world now and still going strong. No C.O.D. orders. Add Buy from t. amateurs ‘bey from local your deal end us his name if can not supply you. dealers or for nearest dealer. Formica tops and | oo Movable plates are screwed on and not clamp-« 11 plate * ked down. .$1.80 11 plate assembled...... $2.75 21 2 ~ «se ae 21 - -) Wewans 3.25 41 . ~ Je ae 41 ” aera as 4.25 SOLD BY YOUR DEALER OR TRESCO, Davenport, lowa THE JONES CABINET LONG WAVE RECEIVING TRANSFORMER For DAMPED or UNDAMPED Wave Reception A carefully wound Receiving Transformer with an approximate Wave Length of from 200 to 8000 Meters Equipped with Variable and Fixed Condensers Rheostat and Grid Leak. Fitted to take the latest MARCONI Vacuum Tube. Bake- lite Panel, Silver Plated Switches and Contacts, Mission Oak Cabinet. Entire Apparatus built within Metal frame to permit easy removal. Model “D”, as illustrated, SIXTY DOLLARS, Net. Model “E” fitted with Modern “DEAD END” Switch and High Grade Hot Wire Am- meter, Eighty-Five Dollars net. New Bulletin sent on request. THE JONES RADIO CO., 384 Monroe Street, BROOKLYN, N. Y. “P.W.” HAS THE LATEST MEMORIZE RADIO APPARATUS IN PHILA. CONTINENTAL CODE es | on Fi Fn a me _ Philadelphia ALMOST INSTANTLY Gute Getta, Murdock, DeForest, Acme Ap- am mates Tan een ene paratus, A. H. Grebe & Co., Kilbourne and : Variables and Tuners, Universal “Wound In- COMPLETE CHART a and full instructions TWO DIMES Est 1911. Radio Call “srw” c. K. DODGE Fer PT ee Box 2) Mamaroneck, N.Y. PHILA. SCHOOL OF WIRELESS TELEGRAPHY Parkway Bidg., Broad Street near Arch ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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YOUR SET WILL LOOK NIFTY | WHEN EQUIPT dealin C AND S$ iatiie DIALS TYPE only NAVY TYPE DIALS Ran hoc Pat Your Set In The Commercial Class Replace the old fashioned scale and pointer with a brilliant, pure white, ivory celluloid dial which will form a beautiful contrast on the black rubber front of your receiving panel. C and S DIALS are constructed of substantial white ivory celluloid, 4 inches in diameter, highly polished, beautifully finished, and artistically engraved with two scales. One scale is calibrated for writing in station call letters at points at which stations are received; the other is accurately divided into two hundred divisions, the most finely divided radio scale in use today, making it most adaptable for use with any apparatus requiring precision adjustments. C & S Dials Are Essential For Dependable Work When you mark the station calls upon your C and S DIALS, you can “tune in” stations in a small fraction of the time that is usually required with the old scale and pointer method. ADVANCE Order Yours Today ANNOUNCEMENT If you want to keep your set up with the other fellows, don’t delay equipping it with C and S DIALS The price of the Original C and S at once. The rapid progress in radio demands that you DIALS will advance keep up-to-date—so buy today. to $1.00 October Ist Send Money Order or Persona] Check. 1920- Buy now and save The Original—C and S Dials. Price, until August Ist, he Milevence. 90 cts. Postpaid, complete as described, without knob. Dealers:—Write for Agency. THE C AND S RADIO CO., Dept.USNi7 OMAHA, NEB. “Superlative Radio Engineering Productions.” ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS 73

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Thermo-Ammeters, Milliammeters and Current-Squared Meters SStoONn Model 425 Miniature Size Instruments for Radio Service are the ideal Instruments for the amateur. They are particularly adapted for use on small size Radio panels where space is an important factor. Their characteristics of accuracy, large over- load ill current consumption and small size make them particularly desiral n amateur and other low-power outfits. use on Audio and Radio frequencies. ( formation will be furnished upon request. Weston Electrical Instrument Company 158 Weston Avenue, Newark, N. J. Branches in all Principal Cities. WE ARE NOW in a position to handle all mail orders with such service and promptness that will surprise you. Unless absolutely impossible, all orders will be shipped within twelve hours of receipt. Order from any catalogue at list prices. We ask a trial. Write for chart containing Q abbrevia- tions and code. It’s free. RAPHAEL ELECTRIC CoO. 1405-Sth Ave., Pittsburgh, Pa. Tel. Grant 3520 | Stock In The South MMERCIAL AND AMATEUR WIRELESS APPARATUS OF ALL KINDS Holt Electric Utilities Co. Jacksonville, Fla. 74 ALWAYS MENTION QS T WHEN WRITING TO ADVERTISERS

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Gentlemen: for one whole year, for w you one dollar. YOU HOW TO MAKE IT The Magazine You’ve Been Wishing For RADIOIST is published monthly by the International Society of Radioists, a rapidly growing organization of radio amateurs, which is world wide in scope and will soon reach a membership total of 100,000. Small in Price; Large in Contents Because the price of RADIOIST is only 10c do not think that it is a small magazine. It is not! attractive two color illustrated cover. On the contrary, RADIOIST is of large size, 8x 11 inches, has an average of 28 pages and an RADIOIST, today, contains more material and real how-to- make-it articles, for the money, than any other radio magazine in existence. Radioist is as Original as its Name Every issue is full of live, peppy articles together with many new ideas and stunts that you will certainly like. Some of the departments are, “As We Are” a department for the printing of your picture and of your set; “International Amateur Radio” which tells about your work in the new international relays; “Junior Radioist” for the radio beginner; “Allied Clubs”; “Radio Stories”; an enormously large “How-to-make-it” depart- ment and many others including the section on scientific jokes called “The Tickler’” which will certainly appeal to your sense of humor. If it can be Made, Radioist will Tell You How-To-Make-It In its few months of existence, RADIOIST has already become famous for its how-to-make-it articles. It is the aim of the publishers to print only articles that will do the most good for the most readers and insist that every article be written by an authority on the subject. This is why RADIOIST will soon be the most widely read radio magazine in existence today. Start Your Subscription at once Do not miss out on another issue. Order RADIOIST from your newsdealer at once, or fill in, tear off and mail yearly subscription coupon to us today. A delay means you will miss out on a lot of feal good material that others will get. So act now and subscribe today. INTERNATIONAL SOCIETY OF RADIOISTS Dept. R2, Omaha, U.S.A. USE THIS COUPON NOW International Society of Radioists, Dept. R2, Omaha, Nebraska. 10c the copy $1.00 a year Please enter my -r-¥ to RADIOIST h anywhere ich I am sending WHAT OTHERS SAY Here are a few of the many praises that we are constantly receiving. I received the first copy of the “Radioist’” and was very pleased with it. I congratu- late you on your excellent start. C. A. Harrison, Lockport, N. Y. I just finished reading my “Radioist” and I am certainly sunprised that such a splendid magazine can be published for only 10c. Accept my personal check for 5 years subscripton. A. Crawford, Chicago, IIL Enclosed please find M. O. for a year’s subscription to Radioist. Please start my sub- scription with first issue as I don’t want to miss out on any numbers. I have examined a copy of “Radioist” at my friend's home and want to say I am highly pleased with it J. R. Doig, San Francisco, Calit My newsdealer has been selling “Radioist” so fast that I wasn’t able to get a copy of the last issue. Please send me a copy at once and accept my eheck for year’s subscription. I think the “Radioist” how-to- make-it is the best yet and I want to insure myself getting every copy. Ray Hefley, lt x ; Si is Minneapolis, Minn. & Address and you'll receive ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS Don’t be one of the few—be f - scribe to RADIOIST. Send this cou AF pon and a dollar bill toda RADIOIST for ONE whole YEAR. ”

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Give Your Spark A Chance Our New R we all of the energy in the closed circuit a free discharge surface. Electrodes are 2% in and +» imch thick accurately shaped on a milling machine. Made with 6 or 12 points for h “note. You can’t beat the combination of an Acme transformer and our 12 point rotary A highest efficient gap ever offered, fully guaranteed. onal Priced at $50.00 with either rotor. “= DEALERS WRIT! We carry the New Moorhead Electron Relay WRITE FOR DESCR tectors and Amplifier Tubes in Stock. PRICES LITER IMMEDIATE DELIVERY reless Manufacturing Co. Canton, Ohio 6BJ HEAR OUR QST HEAR OUR QST 6BJ 6BJ a a PAM AT EFURS—DEALERS é s WE CARRY A COMPLETE LINE OF S a af , REMLER——- MURDOCK DE FOREST. a 1 a Complete Line of Parts for Radio Use. = = Bakelite Dilecto X X X “ a QUERY DEPARTMENT ABOUT YOUR TROUBLES. a ® CALIFORNIA ELECTRIC SUPPLY CO. e = 643 MIS N ST., SAN FRANCISCO, CAL. 2 6BJ 6BJ } BROADCASTS ON OUR PRODUCTS NIGHTLY 9PM 6BJ 6BJ RADIOPHONE & “C.W.” ACCESSORIES | | Recognized as the largest and best "Fou Need Type J—o-1' ter 3” Dia. Flush T . . $6.00 Several Other Ranges Available. No Delay! Western Ele e “E” 350 Plate Vv 4 , rT $18.00 Moorhead Tra VT, 600 Plate : os 6s o+ eee Airplane Type V » Electric Micro P! 1s - . $6.00 Transmitting od Fixed Condencere and Inductances, g 7 : ih ES Filters and Small Parts SOMERVI! RADIO LABORATORY Send ten cents for deccriptige catalog to Dept. C. ie Semeaes SS. SOMEVILLE, 45, MASS. 900-902 Penn. Ave., N.W., Washington, D.C. 76 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS a | .

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: } CRM AANA 4300 ANNOUNCING Our NEW SERIES “T” VARIABLE CONDENSER. A heavier model than our SERIES “S”’, but built along the same general lines. Plates are of sy” aluminum. ° We SPECIALIZE on ONLY THE BEST. SATISFACTION GUARANTEED. PRICES SERIES “T”’ SERIES “L” No. 20 2 plate Vernier...... $2.00 No. 2300 23 plate .00075...... $6.00 oa aa B _ a ~~ tenes aoe No. 4300 43 plate .0013 ...... 8.00 o. plate .U Ae ° No. 170 17 plate .0003 m.f..... 3.15 No. 6300 63 plate .002 ...... 10.00 No. 230 23 plate .0005 m.f..... 3.60 Indicating Dial fitted to either style No. 310 31 plate .0007 m.f..... 4.30 condenser for 75c extra. No. 430 43 plate .0O1 m.f..... 5.25 , a : No. 630 63 plate .0015 m.f..... 7.50 NOTICE: Owing to shortage on cer- tain materials, we are unable to fill orders for SERIES “S’” Condenser at this time, but can ship NEW SERIES and SERIES “L” from stock. Include postage for one pound on SERIES “T” condenser, and for two pounds on SERIES “WL”. ot us The Wireless Shop 511 W. Washington St. A. J. Edgcomb. Los Angeles, Cal. Chelsea Oscillator Enclosed within the bakelite base are three small mica condensers, two of which form the capacity coupled feed back circuit, and one constitutes the grid condenser. This instrument entirely eliminates the use of all tickler coils in undamped long-wave reception. Range 3,500 to 20,000 meters, full instructions with each instrument. Purchase Chelsea Apparatus from your dealer. PRICE $3.00 Chelsea Radio Co., 15 Fifth St., Chelsea, Mass. Manufacturers of Radio Apparatus and Moulders of Bakelite. ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Dep Audion Control Unit Only $13.75 The K. & G. Wireless Supply Co., in its efforts to place technically correct and reliable wireless appar- atus well within the price reach of critical amateurs, announces its new Audion Control] Unit, Type Al. This new unit is absolutely reliable and can be used with every known circuit. It is designed and built for exacting service. It combines the very latest ideas in design with the best of material and workmanship. The cabinet, 8% x6%x6% has a highly polished mahogany finish and with its well mounted panel will add much to the attractiveness of your station. The unit contains these instruments; vacuum tube socket i-prong tube) filament rheostat (10 ohms), grid condenser, grid leak, and filament has binding posts, suitably marked in white, for secondary, tickler, phones, and fila- Whole back of cabinet swings open on hinges and thus permits easy insertion of tube nd complete inspection of the interior. Efficiency guaranteed, or money refunded. Price $13.75, without tube or batteries. If your dealer can’t supply you, order direct. Dealers: Write for proposition. K & G WIRELESS SUPPLY CO. t. 18D, 150 Chambers St.,. New York City WILCOX INDICATING DIALS Of polished hard rubber, accurately engraved, filled with brilliant white, furnished complete with knob, shaft, tension spring, nuts and stationary pointer. 3” Diam., $1.50 180° or 90° scale 2” Diam. $1.25 Postpaid Same Price Postpaid TYPE 104 PANEL SWITCH A complete unit for back of anel ee e lat- est and t in panel switches, better looking, more effici- ent and easier to mount. illustrated......... $2.25 Postpaid Com With ster instead of dial.... 1.50 Postpaid ents brings you our loose leaf catalog. THE WILCOX LABORATORIES, Dept. H, Lansing, Mich. BAKELITE-DILECTO the Standard Insulating Material on all Radio Work Vater-proof, permanent, strong, used by all important Vanufacturers of Wireless Apparatus and others re- uiring the utmost in Insulation. Furnished in Sheets, Rods and Tubes. THE CONTINENTAL FIBRE CoO. oo: -) NEWARK, DELAWARE epee oy 525 Market St 411 S. Main St. jan Francisco, Cal. Los Angeles, Cal. Canadian; Cor ner King & Yonge Streets, Toronto, Ont., Canada. 301 Sth Avenue, Pittsburgh, Pa. 78 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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at is ee A ne a — ae ee me No Seals - No Secrets — But Service ! There is only one Relay Receiver, the TYPE CR-3 Relay Receiver manship fully in keeping with its outward appearance. The circuits used are thoroughly explained in the instructions and | Inspection of the interior of this Receiver reveals design and work- | blue prints which accompany each Receiver. | The use of this Receiver is licensed under the original Armstrong and Marconi patents. The GREBE RADIO guarantee is absolute and unconditional. Each instrument manufactured by us must give satisfactory service. Our interest in the purchaser does not terminate with the sale. The CR-3 Receiver may be inspected at any of the following progressive dealers’: Barker-Fowler Electric Co., Lansing, Mich. Manhattan Electrical Supply Co., New York, Continental Radio and Electric Corp., New York Chicago, St. Louis Doubleday-Hill Electric Co., Pittsburgh, Pa. Leo. J. Meyberg Co., San Francisco, Cal. Holt Electric Utilities Co., Jacksonville, Fla. Pacent Electric Co., Inc., New York City Hurlburt-Still Electrical Co., Houston, Texas. Geo. W. Parezo & Co., Washington, D. C. F. S. Katzenbach, Trenton, N. J. F. D. Pitts Co., Inc., Boston, Mass. Kelly and Phillips, Brooklyn, N. Y. Phila. School of Wireless Telegraphy, Phila., Pa. Western Radio Electric Co., Los Angeles, Cal. If your Dealer doesn’t carry GREBE RADIO APPARATUS, write us for catalogue, mentioning his name. A. H. GREBE & CO., Inc., 74 Van Wyck Blvd., Richmond Hill, N. Y. ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Announcement W* herewith present to the discriminating radio enthusiast, a superior radio telephone licensed under the Sterns patent. We believe we have produced an instrument that stands in a class by itself. Designed by a well known Radio Engineer, executed by skillful mechanics in a manner and of such materials as you would wish in your ideal set. Bakelite insulation throughout, all metal parts highly finished, Weston instruments, Bake- lite panel, and mounted in a piano-finished mahogany cabinet. Due to its liberal rating and compactness these sets will give reliable service far in excess of guarantees. Buzz ulated or Continuous Wave Telegraph 150 Miles. PRICE $375 Televh , - Including ~— Range 100 Miles Motor-Generator Thi t is complete ready to operate except fer 8 volt storage battery and three Class Il Marconi-Moorhead tubes. The tubes are mounted within the cabinet. Siz verall 84% x 11% x5”, making installation possible in cramped quarters, such a tor-boats, apartment houses, etc. The motor-generator is absolutely noisele | can safely be kept in the operating room. We so manufacture a lower power set details of which will b> forwarded upon request Orders will be placed in rotation, deliveries to commence September Ist. THE RADIOLAND CO., 129 Wadsworth Ave., New York City. BOUND VOLUME Ill “COSRADIO 99 Mark of Quality The Radio Supply House of the Middle West IMMEDIATE DELIVERY Transmitting Sets Receiving Sets Complete or Parts RADISCO AGENTS Volume II! of QST, just completed, hand- somely bo | in dark red cloth, with giit AMRAD AGENTS lettering, now ready for distribution. Due — to shortage of two of the numbers, the F . supply ic limited, ce send ia your order at Satisfaction Guaranteed once. —S ee ——— The ideal way of preserving your QST’s . —_————_— icouaeen ree ee THE COSRADIO CO. QsST WICHITA, KANSAS. 61 Waverly Bldg., Hartford, Conn. 9-BW 80 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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NAVY TYPE—PRICE $2.40 ASK YOUR DEALER 198 Roebling St., = “ARRANBEE” JACKS AND PLUGS—PRICE $1.50 PER DOZEN. RICHTER & BYRNE, MANUFACTURERS (DEALERS—WRITE) PACENT ELECTRIC CO., Sole Eastern Agents, 150 Nassau St.,. NEW YORK CITY VARIABLE (Patent Pending) PRICE $3.25 FOR THESE ARTICLES Brooklyn, N. Y. Telephone Bowling Green 8079 and experienced instructors. Attention Amateurs ! UTTMARK’S NAUTICAL ACADEMY RADIO INSTITUTE 8 State Street, New York City. Let us prepare you for your first grade commercial license. We have just the kind of course you have been looking for. Modern apparatus Day or evening classes. Write, phone or call for our illustrated prospectus. UTTMARRM’S for Wricarion THE BEST COMBINATION OF THEM ALL $3.00 FOR A YEARLY SUBSCRIPTION TO Pacific Radio News and QST SUBSCRIBE TO BOTH You Save 50c by Taking Advantage of This Offer QsT 61 Waverly Bldg., Hartford, Conn. oo THE AMERICAN RADIO SALES AND SERVICE COMPANY REPRESENTING DeForest Multi-Audi-Fone Wireless Specialty Chicago Radio Laboratory QUALITY—SERVICE WE PREPAY POSTAGE Great American Bldg., Mansfield, O. ALWAYS MENTION QST WHEN WRITING TO. ADVERTISERS 81

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t AL ee THE “‘ILLIN anyt G. F. JOHNS VARIABLE CONDENSER Aluminum Plates i n Rec No. 2. Open Type as Anti Profiteer. Less assembled and tested. eipt of Price. Money back if not satisfied. Justreturn condenser within 10 days by insured P.P. additional] ma by a watch mechanic nship. Personally we Amateurs who have : “weather” from 9ZS. }©O YOU DO IT” ne say. They infer, bably, that anything ar all the earmarks of » receive an instru- honor”, and above all tified to ILLINOIS”, ere is hear from a wait any than take d rather th Said. ‘Star Spring” feature, > The action of this friction that holds which it may be automatically centers h other, and prevents lation by construction r any necessity of re- always right. Once one thing that ever give you trouble. nds for their letters of Vw » Black » Catalog, and make set our prices at the “middie man” out for sumer’. Ave., Springfield, lil. YOUR RECEIVING SET Mounted in one of our Cabinets will give you a set to be proud of Built of % inch stock, 18 inches long, 12 inches high and 7 inches deep, with our novel drawer arrangement ie ex- posing apparatus for inspection. We now furnish these Cabinets in either mahogany or oak, with a beauti- ful hand rubbed finish. Due to advances on materials and labor we were compelled to slightly raise prices as follows: No. 1—Cabinet with genuine %% inch Bakelite Panel.......$15.00 No. 2—Cabinet with % inch Panel, same as cabinet... .. 9.00 No. 3—Cabinet with drawer bottom, but no Panel...... 8.00 Our firm name is being copied. Make sure when ordering goods from us to look for our “PRACO” trade mark. Bp oO Penn Bay.ce Radio Apparatus Co. Dept. B, Reading, Pa. ae Cc» - “SY Box 110, TELEGRAPHY (Both Morse and Wireless and RAILWAY ACCO! NTING taught thoroughly and quick! Big salaries now paid Great opportunities for advancement ‘ st an largest school; established 46 vears. Endors:«! by Telegrap! ka way. Radio. and Government officials — low ( atalog free opportunities to earn large portio @ Street, Valparaiso, ind, COOCE’S NTTITUTE PATENT-SENSE eal |) aes Fre P ok for Inventors & Mfrs? ead | I Return Mail PREE. Write ——) La ACEY, Dept. VACUUM TUBES REPAIRED MARCONI-MOORHEAD AudioTrons at $4.00 Each, Postage Paid We have the Standard Four Prong Base for Sale Price 60c Each DALTON LABORATORY Dalton and Belvidere Sts., Boston 17, Mass. 7 radiat weilgs LEE “JUPITER 000 feet. $12.00 9? STRANDED AERIAL WIRE PER M. copper. The ideal resistance. Shipping Send postage. 8 Moen St. Worcester, Mass. 82 * PRICES SLASHED * Regardless of Conditions On Condensers, Audions, Phones, Raw Material, Switch Points and etc. SEND STAMP AT ONCE FOR CIRCULAR RADIO TESTING STATION 25 Sturges St. Binghamton, N. Y- ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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Price ‘ , “COOTIE” KEY Cat. No. YM6 The “Cootie”’ key is the snappiest sending device offered on the market for reliable spacing of characters. Listen to 9NV, 9LU, 9MS, 9UG, 9BY, and judge for yourself. Large standards, formica knob, substantial silver contacts suitable for use up to 2KW. The double action of the “Cootie” key lends an in- dividuality to your sending. Nickel Plated $5.00 © Plain Brass $4.50 Distributors for the DeForest Radio Tel. & Tel Co. Clapp-Eastham Co. Amrad Products Wm. J. Murdock Co. —Immediate Deliveries— Send for our Fifty Page Catalog, Address all Orders to Radio Dept. No. 67 Rear View RADIO SHOP Short Wave Regenerative Receiver. Price - - $42.50 Variometers and Vario-Coupler used in the above set are sold separate for those who desire to construct their own. Variometers, (Two required) Each $10.00 Vario-coupler, on base ........... 7.00 Add postage, otherwise sent via express. Shipping weight: Variometer, 3 pounds; Vario-coupler, 2 pounds. Wiring diagram and directions for oper- ating sent with units. IMMEDIATE DELIVERY. She RADIO SHOP Dept. Sales Offices: Bank of Italv Bldg. Plant: San Jose, Calif. Sunnyvale, Calif. THE AMPLIFONE A high grade handsomely finished cabinet loud-speaker which enables you to hear signals all over your station. Even faint signals are readable without head receivers. TYPE “A” AMPLIFONE complete . $15.00 TYPE “A” AMPLIFONE with adapter for your own receiver.... 12.00 F. M. DOOLITTLE co. 157 Valley St., New Haven, Conn. ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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sPECI¢!I Tr oF o A Few at Ha Our Origina your ‘"Tror Honey -¢ RADIO 630 WASHID 6 4 OUR NEW FILAMENT RHEOSTAT For Back or Front of Panel Mounting. » $1.75 Postpaid ohm resistance, fine adjustment on or 6 volts. 2%" Diameter. Smooth action IMMEDIATE SHIPMENT ! « GROUND WIRE Rubber Covered Buy the 100 Ft. $7 ‘ .00 Wwe., Lightnin len 17 Lbs. 100 Ft. « Switches, $4. $3.50 Plus 5 Ibs. Case With Jiffy ENCHED GAPS $15.75 Radio Meters Left— $1 Why Pay More? _ Adapter Permits Use of Socket, $1.75 Postpaid. Our Bulletin. rs, $1.50 Per Pair Postpaid. a Variable Condenser, T ler 8 w EQUIPMENT CO. BOSTON, 11, uning Unit. Two a Third Makes a ave-Meter. MASS. THE WESRAD OSCILLATION TRANSFORMER Designed for 200 meter wave lengths and power up to 1 kilowatt, has the following distinctive specifications which make it superior to any other on the market: INSULATION: Bakelite Dilecto, % inch thruout. WOODWORK, base and arms: Quartered oak, standard weathered oak finish, PRIMARY: 3 turns of 1 inch heavy brass ribbon. SECONDARY: 8 turns. Shipping Weight, 9 pounds. PRICE - - $10.00 Western Radio Electric Co. 512 East Ninth St., Los Angeles, Calif. Immediate Delivery. io Handbook & . ns much valuable radio in- :, DeForest Ma tu Write for this book todee The Newman-Stern Co. OST a ARLI IGT : N TESTED CRYSTALS minerals on @ URB when you ’ | your detect- FE XQUISITELY Cc Buy Arlington ted Minerals, ‘ nm, post paid NEWMAN.STERN CO. ST Clevela ind, O. aioe Radio Phone pted standard in_wire eas if they are not BETTER thing you've e-erseen return lieashrefund. Our Kadio Book and Catal t, describes them, and free on many rumenta. "The Newman-Stern Co. «OS : ovetand, O- - x E; NEW ORLEANS RADIO APPARATUS AND SUPPLIES A. ROSE 121 Camp St. NEW ORLEANS, LA. Send 10c for Latest Catalogue L. Ce SHORT WAVE COUPLER —170-625 Meters— Wound with 20/38 Litz on Bakelite Tubing, Equipped with DeForest 14%” Knob, Brass Pointer and Scale. Used by U. S. Government in SCR-54 Receiver. PRICE $4.50 UNMOUNTED GOUSE & LORENSON HUDSON, N. Y. ALWAYS MENTION QST WHEN WRITING TO. ADVERTISERS

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Spark Load Coil Range 0 to 3500 meters. Taps moulded bakelite. and good appearance. are in geometric progression, permitting exceptionally fine tuning on all the longer spark wave lengths. Ten active inductance steps. Base and knob All “Chelsea” apparatus embodies highest de- gree mechanical construction, electrical efficiency CHELSEA Variable Condensers (Die Cast Type) No. 1.—.0011 m.f. mounted............. $5.00 No. 2.—.0006 m.f. mounted,.... re No. 3.—.0011 m.f. unmounted........... 4.50 No. 4.—-.0006 m.f. unmounted........... 4.00 Top, bottom and knob are genuine bakelite, shaft of steel running in bronze bearings, adjustable tension on movable plates, large scale reading in hundredths, high capacity, amply separ- ated and accurately spaced plates Unmounted types will fit any panel and are equipped with counter-weight Purchase from your dealer; if he does not INDUCTANCE carry it, send to us. Catalog sent upon request. Price $3.50 CHELSEA RADIO CO., 15 Fifth St., Chelsea, Mass. Manufacturers of Radio Apparatus and Moulders of Bakelite. CcQ—cQ ——— QRW? The “R V A” Sales Plan which enables all responsible Amateurs to purchase Radio Appar- atus, Parts, raw materials and supplies on the INSTALLMENT PLAN is the solution to your problem of obtaining the BEST there is manufactured without the usual large outlay of cash at one time. The new “RVA” Binders are ready. Send ten cents, stamps or coin, for. the binder, back copies of the “RVA” BULLETIN, the Bargain Supplement and keep up with the times in the way of modern equipment for your station. J. DONALD VANDERCOOK & CO. 139 South York Street ELMHURST, ILLINOIS ——— mene ARCO Save $2. : AMPLIFYING TRANSFORMER is built for tubes now on market. Mounted $5.10 Postpaid E. L. LONG 21 Magnolia Terrace, Albany, N. Y. Best of Everything in Radio Apparatus and Parts. Send Stamp for Catalog “Q” J. H. BUNNELL & CO. 32 Park Place, New York Important Announcement for Central States Amateurs New Radio School with Apparatus Department in connection Fills Long Felt Need At last the hopes of central west radio enthusiasts for an adequate radio school and supply house, centrally located, are realized. The Independence Radio Institute (thirty minutes ride on electric car from Kansas City) has been founded to meet this great need. Strictly speaking it is not a new concern, but is a combination of several interests, enlarged in scope. It is successor to the Graceland Radio Institute (9YO), the Independence Radio Laboratory (9ZH), and Arthur B. Church, Wireless Specialist. It is under the manage- ment of Messrs. Arthur B. Church and Paul E Anway, experts well known in the radio field. The radio school, featured by its complete modern equipment and experienced instructors, will be the best in the central west. Attractive tuition discounts are offered to amateur oper- ators. New classes will be formed the first Monday in each month. A catalogue contain- ing full information will be mailed upon request. The Sales Department will carry a large stock of all leading makes of radio equipment. As exclusive distributor for A. H. Grebe & Company, it will handle the business of this concern in the central west. Experimenters in the vicinity of Kansas City and Independence are invited to visit the salesroom and inspect the apparatus on display. Mail orders will receive prompt attention. A catalogue of ap- paratus will be sent upon receipt of names and addresses of six live central west amateurs. Independence Radio Institute INDEPENDENCE, MISSOURI ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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CLASSIFIED ADVERTISEMENTS Five cents ; d per insertion, in advance. Name

and address e counted. Copy must be received by the 101 nonth for oustnatie month’s issue. WANTED | Radio vaving good practical operating know le nd wihe acquaintance in localities havin mateurs or more. Pleasant — time w adio firm of highest standing. No «5 sell. Give full particulars to- gethe ' call letters of 12 or more amat who know you personally. ADDRE : P. O. BOX | CITY HA <TION, NEW YORK CITY. TELEGRAP ‘ oth Morse and Wireless) and Rail- way Account ght quickly. Tr Big salaries t opportunities. Oldest and largest 1 46 years. All expenses low—<can Catalog free. Dodge's Institute, R school; esta earn large

St.. Valpara Indiana BUSINESS RTUNITY: Deo you want a of the profit » the sale and manufacture of radio equipment ” ssful radio concern increasing capital. You can Small shares. Box 85, Care QST Magazine, i, Conn. FOR SALI Long-Wave Receiving Set. Range 200-20,000 damped or undamped signals. Will reger park signals on all wave lengths. Price $200 F.O.B. Rockville Center, J. O. Smith, Rockville ¢ | I FOR SAI K.W. Thor. transmitting set. Amrad Wavemet Audio-tron cabinet, A battery, (storage Russel Huckstep, Lebanon, Ind. SELL OR ADI K.W. rotary gap. Want Vibraplex B Wilcox, Angola, Ind. FOR SAI Cash: One ‘Kilowatt United Wire- less op sansformer, 30,000 volts, $85.00. Condenss« . copper plated jars, thirty-six, $20 Ons ship rotary with variable speed resistan ' AC. or D.C., $25. One large magnetic mn be used with bug, $5.00. One Clapp-Ea lation transformer, Eros size with variable $10. This apparatus will not be sold sepa ss such offers cover outfit. Boxed and ship half cost to purchaser. Irving Vermilya, ! Mass FOR SA e set, consisting of head and tail stock, se swing, tool rest, ready to mount on your ber Also DeForest vernier type .0015 condense case, $15. Would consider J tubes or other in exchange. J. F. Furey, P. O. Box 629, Hart FOR SA Eastham marble base aerial switch cost new sell for $5.00, Amrad $7.50 wave meter fo ; omposition base standard capacity ground sw ‘0, Dubilier condenser .01 capacity maximur 1.000, cost $45.00 and worth it, sell for $25 bargain). Edgcomb-Pyle 1 K.W. transform switch allowing 4 variations of power w $36.00 several years ago (another real bar $20 1 complete set 2000 ohm Strombe phones selling for $12.50 every- where at sd 1 complete set 2800 ohm Bran Transatla worth $10.00 for $6.50. Each instru- ment so guarantee to be exactly as repre- sented. W nsider trade for Chicago Radio Labor- atory tw » amplifier, a good wave meter reading 600 met ver or a good action 10 amp key. Will sh ») on receipt of 1/3 purchase price. G. R. H Oelwein, lowa. FOR SA Inch Bunnell Spark ~ Coil good con- dition ha mitted 75 miles $12. One 1 K.W. Spark Ga One Audiotron used less than three hours $4 Adapter with nickel plated bracket $1.00. M Higgins, Oldtown, Virginia. WANTI Grebe RORD end CR4 cabinets. Baldwin Milton Benisch, 644 Tenth Ave., N. Y. ( EXCHAN( chanical drawing outfit for 2 vario- meters o win phones. H. uthwick, 103 Green St.. Fa ; Mass ALL AMATEUR APPARATUS bought or made in accordance with The Radio Buyers and Builders Hand- book invariably Is very profitably. Study my June and July y advertisements, see why, get your copy now. *R Clark, Barnes Rd., Newton, Mass. ok FOR SALE: Brandes Superior Head-set, brand new $6.00, Murdock Coupler, number 344, like new $6.00. Special short wave beng Boo me bank wound coupler, brand new $9.00. New Roller-Smith hot-wire ammeter $6.00, Bunnell 142” spark coil, good condition $7.00. Any above itstruments sent cel-post-insured for money only. E. G. , 253 Ninth St, Brooklyn, me Wa FOR SALE—Complete short wave regenerative re- ceiving and sending set. Photograph and description on request. W. D. Matthews, 672 Carroll St., Brooklyn, _N. _Y. FOR SALE: 1 SE 143 Navy type receiver 250-6300 meters $100.00; 1 CN 1022 Navy type receiver 250- 3500 meters $50.00;1 ial Navy type combination receiver, audion and oscillator 50-1000 meters $100.00; 1 Navy type triple detector stand with crystals $5.00; 2 W. E. VT1 receiving tubes $5.00 each; 1 Moorhead receiving tube $3.50; 1 G. E. Pliotron receiving tube $2.00;1 Two K.W. transmitting key with self-aligning heavy silver contacts $2.50; 5 seven inch black petti- coat column Electrose insulators type CH 638 —_ $10.00—$2.00 for the lot. Above guaranteed Funded cally new and in perfect condition. Money = ded if not satisfactory. A. J. Phillips, P. O. Boston 24, Mass. FOR SALE: Robbins & Myers 1/10th h.p. universal motor, variable speed to 8000, considerably used but in good running order, $10. Brandes hot wire am- meter, 0-10 amps., front connected, good as new, 4 Old United Wireless change-over switch on marble base, battered but entirely serviceable, $4. Old United Wireless key, 2 k.w., much used but serviceable, $1.50. Pair Brandes Superior on head band, old and much used ‘but still good, $2.50. Shipped prepaid. K. B. Warner, 721 Main St, Hartford, Conn. BARGAINS—Adams- Morgan Navy coupler $10.00; Grebe variometer, Grebe dial $9.00; Grebe variometer form $2.00; Mesco 2 inch coil $8.00; Cabinet like Grebe CR1, $3.00; 7 DeForest honeycombs, 3 large litz, LC100 mounting, all $18.00. Press, Thrall Ave., Woodhaven, N. Y. EXCHANGE: New Govt. Model Colt Automatic 45 with Holster, Value $45., Want Paragon or Other Short Wave Regenerative. Albert Stevens, Bar

Harbor, Me. , ; FOR SALE—Transformer 3 K.W., Clapp-Eastham Type E, $40.00 F.O.B. here. David Moore Farmington, Conn. FOR SALE: Omnigraph Number Two Junior, key, phone, extra dials, new; six volt storage bitters complete ¥% K.W. transmitting set cheap, photo and details free. Write “Radio”, 601 2ist St, N. W., Washington, D. C.

RADIO MEN The Mutual Purchasers Association will save you money on all WIRELESS APPARATUS Write Dept. Ail2 for details. MUTUAL PURCHASERS ASS’N 2-4 Stone Street, New York

FELLOWS— SELL AND TRADE YOUR APPARATUS THRU THE QST CLASSIFIED ADS. IT “WORKS”!

86 ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS

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R & M Special Rotary Gap Motors RUNS ON 110 AC OR DC CURRENT. 1/10 H.P. EACH 2,500 TO 8,000 RP M VARIABLE SPEED. SUPPLIED WITHOUT PULLEY. Place your order now for quick delivery. | An at, Zak, “3 Only a limited supply is available. We Carry A Complete Stock Of All Standard Radio Apparatus. | DOUBLEDAY-HILL ELECTRIC CO. RADIO DEPT.—DESK A 715 12th St., N. W., WASHINGTON, D. C. 719-21 Liberty Ave., PITTSBURGH, PA. o~_ HIGH SCHOOL STUDENTS— Special Summer Courses in Wireless during July and August. ‘ SUMMER RATES to Students Only: ee ONS sb wane aes ued $10.00 per month VGN. COMPOS cc ccsecsecns 5.00 per month 4 Comprehensive instruction in SPARK, “ARC” and other “C.W.” Transmitters. i Thorough instruction in Vacuum Tubes as Detectors, Amplifiers and Oscillators. Study under former U. S. Government Radio Inspector for New England District. A course started this Summer and continued in the Evening school in the Fall will secure for 3 you a first grade commercial license which is a ticket as well as a passport to all foreign countries affording opportunity for foreign travel. With the present high wage scale which will not drop there t is an excellent opportunity for providing a means for a college eduction later on. 4 5 MASSACHUSETTS RADIO & TELEGRAPH SCHOOL. 18 Boylston St., (cor. Wash.) T ARTHUR BATCHELLER Boston, Mass. R. F. TROP G. R. ENTWISTLE Tel. Beach 7168 gy ATTENTION AMATEURS 45 volt “B” Batteries—6 different voltages. Guaranteed one year...... Each, $5.50 Postpaid BATTERIES ! Filament Batteries for your VT’s and Audio- trons guaranteed to give satisfactory service Parkin Rheostats ......... Each, $1.00 Postpaid for three years if properly handled. Nickel-Plated Switch Points—\%,”" x 4%” beveled 6v—60 to 80 Amp. Hr................. $27.70 heads—Complete with %’’—6-32 Brass machine RE batcatwhonuseentian 30c Dozen, Postpaid 6v—40 to 60 Amp. Hr. We specialize in raw materials and parts. Write us for prices. Pacific Radio Distributing Co. Pomona California HIGH VOLTAGE UNITS: 10—(large), 3 cell flash light batteries. . .$3.50 Immediate Delivery. Pittsburgh Radio Supply Co. Sixteen Eureka St., Pittsburgh, Pa. ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS 87

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/ RAI RADIO MAIL ORDER SERVICE rsonal Service to the Consumer” lave r many clients by our prompt and courteous attention to their wants. along these lines, has prompted us to establish a Mail Order Depart- ment it-of town Radio Men can realize and feel the strength of our service when they order a piece of apparatus they can get it at onee and not | it is manufactured or otherwise secured; and f the more important parts below: aA DION CONTROL PANELS RS ar - .$15.00 Radio ‘ Se Rs ncadediih dcaee x 50 00 Radio ‘ tector and 2 step amplifier....... 70.00 RORA COP GR. co.cc geseteeseses ee 11.00 RORH tector unit with batteries......... 17.00 P 400 ED. ha or eecesasetee nes caus 12.00 P 401 Unit, with Oak finished cabinet. 14.75 P 402 Unit, with 40 Volt. “B” Battery 22.00 P St Judion, Ultra Audion, 40 V “B” Battery... 25.00 ‘TECTORS (Crystal) RPDI g + . $2.75 D1 with crystal . ; . 2.80 AM ( Jetector 1.75 Test stals mounted ready for use .25 GRIDLEAKS M with holder and leak $1.00 RO‘ denser and leak 1.60 LOOSE COUPLERS Arr t loose coupler . $22.50 CE I meter coupler 14.00 000 meter coupler... 18.50 LLATION TRANSFORMERS Int ~ 100A $16.75 S 16.00 ANTENNA SWITCHES 463 M witch stands up to 1 K.W.. $4.50 F658 tham, three hee with bakelite 12.50 AMPLIFIERS ROF step audio frequency amplifier. . $23.00 RO step amplifier DWH GENIE, 0602 cdbsbrnescccvces 45.00 ROR tector and one step amplifier . 43.00 ROR tor and two step amplifier 65.00 Rad two step amplifier......... .. 50.00 Red detector and two step amplifier . . 70.00 P2 t two step amplifier with “B” Battery. 70.50 BUZZERS seetwiteues $2.25 Ce . 2.25 ? d . 80 _ CONDENSERS Generel Redlle BBA. 660 sss wecseecs . .$12.00 c.V t . 6.28 36 4.74 6 4.75 , 3.75 F tham 7.50 Eastham 9.50 HOT WIRE AMMETERS é No. 128 0-1 or 0-24 Amperes . $5.00 Ro -2Yq Amperes....... sce ceeeess . 7.00 Ext p. Shunts : TUT TTILTTTTtT . we ALWAYS MENTION QST WHEN WRITING TO ADVERTISERS and parts listed above, sent postpaid to any part of the United States. OUR WORD OF HONOR TO YOU OUR GUARANTEE. LET US PROVE IT. CONTINENTAL RADIO AND ELECTRIC CORP. J. DI BLASI, Secretary—J. STANTLEY, Treasurer 6 Warren Street, has been more than upheld and we we carry a complete stock SOCKETS 156 General Radio...... S50 Murdock........... errr S1 Radio Service a R300 DeForest......... 1.50 “B” BATTERIIES 766 Amer. Eveready 22 V. BD AAs. «séee $3.50 7623 Standard 22% V. 1.35 7625 f “B” Batteries, Variable 2.40 7650 3.25 9280 oe 22 Volts, 5 Amp. 1.00 9281 Cyclone 224, Volts, 10 Amp.. 2.00 AMPLIFYING TRANSFORMERS Acme—specially mounted $5.00 Acme unmounted 4.50 Federal 226w 7.50 DUO LATERAL COILS U.S. 25 $0.90 U.S. 35 . 100 U.S. 50 1.10 U.S. 75 tee U.S. 100 1.30 U.S. 150 1.40 U.S. 200 1.50 U.S. 250 . 1.60 U.S. 300 . 1.80 U.S. 400 . 2.00 U.S. 500 . 2.20 U.S. 600 .2.50 U.S. 750 2.70 U.S. 1000 .. 290 U.S. 1250 . 3.50 U.S. 1500 4.00 HONEY COMB COILS = 25 ...-$1.46 * 35 1.45 = 50 1.52 L. 75 1.60 Gen 100 1.70 Bo 150 1.80 L. 200 . 190 L. 280 . 2.00 L. 300 .. 2.10 L. 400 . 2.28 L. 500 . 240 L. 600. . 2.65 L. 750 . 2.80 L. 1000 ~~ L. 1250 . 3.36 BD ob we Se ce cteseveseonreonbed 3.60 IS New York

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Electrical Develop- ment has proved that the simplest way is the best. A Short-Cut to Expert Efficiency The Connecticut Variable Condenser increases the efficiency of even the most skillful operator. It is a necessity for those of average skill. Ranging over a scale of 360 degrees, it permits far finer adjustments. Thus clear readings are secured at the extreme of the scale—an impossibility with the rotary condenser. You may do average work with a rotary—you experience the satis- faction of an expert with a Connecticut. An interesting brief booklet describes it con 7 pletely and plainly It’s yours for a _ postal. Mention your Dealer’s Name CONNECTICUT cctecrric COMPANY es Meriden Connecticut

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In ¢ hav« ROO tec t« mair of \ and = operators now consider vacuum tube detectors absolutely ential for long-distance work. That these are not required frequently surprising results in long-distance receiving, is 1e fact that the signals of an Amrad Quenched Gap set of power may be readily copied, in the East, with an Amrad letector 300 miles away. nals from the same type of set Moreover, no matter how completely equipped bam a = 2 your station, you should have an Amrad Crystal Detector for local work, and as a “stand-by corded by Amrad Crystal De- hundred miles away. in emergencies when tube filaments burn out or batteries become exhausted. and low cost of operation and distinct advantages in favor Prices: Type C, duplex, as illustrated, $6.50; tal Detectors. Expensive high Type C-1, single, $3.50. Complete feeler mounting and cap only, $2.50. Descriptive e batteries are not needed, nor Bulletin T mailed upon request. jite or frequent renewal of RADIO OPERATORS: Send your station call letters and name of nearest dealer and we will mail you our catalog now ready. Latest bulletins for insertion therein will be forwarded you monthly. RETAILERS: Our new trade proposition became effective last month. A request will bring all details and our complete trade catalog. iN [YADIO AND [YESEARCH (ORPORATION Factory and Laboratory : Address all Communications to New York Office. one * ~ “*- Medford Hillside, Mass. ae’ e

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