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AMATEUR 1920 OVER 100 I L LUSTRATIONS Edited B' NEWSREG

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AMATEUR 1920 OVER 100 I L LUSTRATIONS Edited B' NEWSREG Radio Map of the !3, /924Y 15 Cents JANUARY RADIOAMATEUR 1920 OVER 100 I L LUSTRATIONS Edited b' NEWSREG. y.3.PAT.OFF. Hoe] I ?sback "The 100 Wireless Magazine" Static Eliminayt iorn DW eIcut o.rnal Reception Construction of a Radiophone Set By I.:. S. Roç.i o- In This o .by .f k II A Case of Nerves 1 S S ri p The Priess LooP Set Part PERT :.) TER PUBLISH g :,N.Y.C. www.americanradiohistory.com "ASK ANYONE II71O //AS USED 1 T" "My Brandes Headset Never Gives Me a Headache" (Name on Request) The lillitl, ;Ind lightness am very important. The lir;tttdes Ilca(IsCt t'XCII: in them. rCSpcctS. Special attention has hC, n iven to this feature. BRANDES CLEAR TONE WIRELESS LIGHT WEIGHT HEADSET DEPENDABLE SERVICE SCUre 1(Ad', (lticienCV in actual u.c. Sharp. 1 100m-red. Readable Signals assured by "BRANDES MATCHED T ONE" - Exactly matching the tune of butte receivers in each set and thus eliminating a 11 (ultfllsiml due to unmatched harmonics. a Ilra,"Ics . supeior Headset and use it critically for ten Jays. TRIALBuy Then, if it Jaes,,'t ram,' up to our rial,,,,- r your e.rprrfafiuns, crie,,,, it and your money roi!! be cheerfullyUy r,'Ju sided. Test compare - sensitiveness, if- it frith others clearness, distance. Prove for aourself the fie,' quality. the "snatched toue." The two phranu,s,fur toned exactly dia alike strengthen the signals and Prevent blurring. used by many 11. experts. and S. Government OFFER experts abroad; by colleges and frrlrniea! schools; and b' prat ,',-,-louais and amateurs everywhere. SEND ec FOR (ATALOCUF C. BRANDES, Inc., Room 823 32 Union Square,re, New York, U. S. A. WIRELESS RECEIVER SPECIALISTS EFOREST,' a Receiver with Eight Distinct Advantages Agencies are ,,, ACOMPLETE, compact and inexpensive Receiving Set ',..,at, ,l in all PY , Ipal I It,. Ask your .gula. having improvements and refinements which increa, {Jren i- l /realer to get you elliciency and eliminate many objectionable features of re I e/ultls r .ipparaln,. cciving apparatus. No longer is it necessary for you to have two or three Combination Audion -Ultra Audion expensive, and One -slop Amplifier; Type P- inconvenient and cumbersome tuners spread all 300. SIze 12' í's93,.' 7só Price over your operating table when working all wave lengths. $73.50. Vacuum Tubes. $7.00 each With this new DeFOREST tuning system you can work extra. any and all wave lengths with the one tuner shown at the right. This Set has distinct advantages of minimum table space and of convenience in coupling not equalled in any other type of apparatus. The entire Set is complete in the two cabinets shown here. The Genuine DeFOREST "Honey Comb" Coil System of Tuning is employed -no superior system has ever been invented. Tuner; Type T -200. Size This is a new l)eF'OREST production embodying a 133e "x12,.. "x8 ". Price S77.5o unique and superior tuning system. Possession of this Set without Coils. means more efficient and satisfactory operation; more pleasure and practical benefit for every Amateur. Its price is remarkably reasonable for the quality of apparatus and the distinct advantages the Set offers. Find out more about it at once. Send for a DeFOREST Manual a 50pngo hook ennlalolug full Information about lids and many more IrlI'ISltEH'l' !marmorean, as well giving movie useful bdunuatlou far Ihv Amateur. Moiled anywhere upon reeelpl or 111 rut.. DeFOREST RADIO TELEPHONE AND TELEGRAPH CO. Inventors and Manufacturers of High Grade Radio Apparatus. 1401 Sedgwick Ave., New York City 1V1Iv....,__ _....1.wtV1., bench, by n,enfa"nng ,he "lfaJiu Anon, Pauly ,.. .l..erlisers. www.americanradiohistory.com It .l,tnu,tly Iti_'() RADIO AMATEUR NEWS AMPLIFY YOUR RADIO SIGNALS OE of the greatest drawbacks since the invention radio signals to such an intensity that he can hear of wireless telegraphy is the receiving of weak the signals about his station without the need of the signals at the receiving station. Many devices were telephone head set. but without suc- proposed to improve this condition, By the addition of a loud talking telephone he is able to hear cess, on account of the mechanical difficulties encoun- the messages many feet away from the instrument. He is also tered in these ampli- able to demonstrate the fying devices. operation of his wireless However, this was apparatus to his friends. recently solved by the The super - sensitive introduction of an ex- DETECTAGRAP H- TRANSMITTER here- ceedingly sensitive mi- with shown is two and crophone transmitter, three -eighths inches in di- which is known to de- ameter, five -eighths of an tect sound waves with inch thick and weighs less than three ounces. It is great accuracy and the most sensitive sound magnify them through Practical Instrume nts for Commercial detecting device ever an intermediate tele- brought before the public. phone circuit. and Scientif is Purposes. The manner in which By the employment the amplifying process is of the new DETECTAGRAPH- TRANS- attained is by attaching with tape the DETECTA- the GRAPH- TRANSMITTER to the regular wire- MITTER, amateur can amplify the less receiver as indicated in the diagram. Other Uses -1 NOTICE is this instrument applica- Although prices of raw material and labor have in- Not only creased greatly in the last four years, we have con. ble for amplifying radio signals, but tinned selling our instruments at the pre-war prices it can be used with equal satisfaction due to the fact that we had a large stock of sounds. Phono- material on hand. That material is now almost for magnifying other exhausted and we will be compelled to renew our graph music can be transmitted from stock at an increase in price, but for a limited time one place to another by means of this you can still get the benefit of the present low Our Super -Sensitive instrument, and those who are afflicted prices. Detectagraph Trans- mitter. Price, $7.00 with deafness will find enormous Complete benefit by using this transmitter. It Is t h c Aflust.d Our 'tuner Sensitive loud to/king Moa.l tarn, slit Hs. greatest d e - 'B' laikie ///zropho e Tronjmd /er telephone v in e 20 h10h Arad. loud % for Recsioesa an building your Stand Búe. own loud Price. $12.00 Complete talking tele- Adiuted rG phone, detec- /lead Jet, tagraph and Model 'C" Rhea-tot, other devices. Horn, w I t h Can be used N o . 20 high IlOd/rf/ for any pur- grade Lou d pose where a Talking Wall sensitive de. Receiver. i tecting i n - Price, Our Special No. 25 Detector Our Seruihve toco Ohm strument is Loud Talking Receiver Rodio Telephone Receiver required. Price, $4.50 Complete $12.oí, C,,,,, pl.t. DETECTAGRAPHS FOR THE EXPERIMENTER FOR DETECTIVES FOR THE DEAF DETECTAGRAPH This detecting instrument Super Sensitive No. 40 of marvelous sen- Receivers to be used In sitivity can be used for detecting secret con- connection with Detect. versations. Outfit consists of Sensitive grph Transmitter.. Transmitter, 25 -ft. Black Cord, 00 50 Receiver, Headband, Case and Battery. $18 $10 Complete rt as ta DETECTAGRAPH JUNIOR DEAF -PHONE The outfit consists of a Super -Sensitive Transmitter, with a cord connector; Super - Detectagraph Rheostat, eBBosomault Sensitive Ear Piece with small black cord; especially made for am- CO -, 25 Church plifying circuit.... ' St., N. Y. C. Black Single Headband ; Black Case and two small Batteries. Transmitter 2h inches in Complete 00 per your ad in diameter, s- Radio Amateur News, of an inch thick, $ 2 please send me free or- and weighs Order lea than three a00 direct from ad. Or write for culars and full particulars $18 free descriptive circular.ir / - De- ounces. For your .bout your Det, tagraph Complete convenience use the coupon. ces. G. ' NAME BOISSONNAULT COMPANY ADDRESS 25 CHURCH ST. NEW YORK CITY CITY Makers of Super- Senitive Microphone Device, e STATE You benefit by mentioning the "Radio Amateur Neros" when writing to advertisers. www.americanradiohistory.com :_ IOW -011, . ,; I e ;.;1 y- ' ? C i / ° / u -_ " ¡JiY a i I s L \ u_____ -i T \ t`'Jtd'r_, -1' ' _ t t / \ 1i 1 pppÌL / j .* / ' t _ _'-J ì\ , \ a\ ` \ ' \ ~ _ `__ _ ' -.P. [ !hi CONTENTS i 'Dí FOR JANUARY 4It:n I, PAGE PAGE I I L Eternal Waves..By H. Gernsback, Editor 333 Our Supplement 354 ICú1 'i11' d?1lar The Priess Loop Set - Part Il Crystal and Vacuum Tube Detectors By Walter J. Henry 334 By E. M. Sargent 355 VI1jill CCr+i Dr. de on the Radiophone 35G r I New Radio Apparatus 335 Forest t. NS Radio Telephone on MountMo Hoodoo 336 Loop Multiple Aerial Switch \I\I By John G. Merne, I. M. T. 357 6 Static Elimination by Directional Recep- tion 337 II1 Designing an Amateur Transmitting An- \\' \! tenna By E. T. Jones 358 /` Fourth Prize Award- Radio Contest 342 \ , 'd Clearing Traffic by "Sparks" 359 Construction of Simple Radio Telephone lli I By E. S. Rogers 343 A Case of Nerves -By Julian K. Henney 360 Multiple Stagege Amplifiers 5r1 Design of Mil ON By Prof C. L. Fortesque 344 Radio Digest 361 .,_ Rebuilding the station -By P. F. Geagan 346 With the Amateurs 362 q, ¡ÿ3i Squier "Wired Wireless" 348 Club Gossip ,I Elec- A Trigger Relay Utilizing Three Junior Radio Cours' .365 trode Thermionic Vacuum Tubes :vi,nemunun.on.u, By W. H. Eccles and F. W. Jordan 349 New Radio Patents .ì6ö Radio Constructor 350 $100 Radiophone Prize Contest 369 How to Build Arc - Generators By H.
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