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?Ro1essional-Serviceman-Adiotrician HUGO GERNSBACK Editor Dec adio afit 25 Cents for the ?ro1essional-Serviceman-adiotrician HUGO GERNSBACK Editor Wen who have made radio: SirOliverLodge www.americanradiohistory.com -.MM/ 11 ---soimems-- ;3o 1á H/ 9,pe1 10' St1" 10 Str 1.1.,,'.04 1' 1 %.1..i WHAT'S N EWS IN RADIO? A. C. SHORT- WAVE RADIO I'II.IITII /l \S PILOT Endorsed by Professionals Power lacks The original idea be- No.K -111 for S ..0 hind the Pilotrons was 171 -A Tubes to make a line of radio Thorough filtration of tubes for a select group direct current output, of professional radio makes hum inaudible. engineers, custom set - Self-contained rectifier tube. Hlghlp compact. builders, radio research- Delivers tip to 220 volts. ers, and others whose C plete. toady for use. Espe.lii l. recommended standards are consider- for the A.C. Super-Wasp. ably higher than the PILOT SUPER-WASI' general public's. To No. K-112 $19.50 win endorsement from for 245 Tubes radio's fussiest folks, two 2.45's Kit Power Easily hn ndlcs 4r 0 had in posh -poll pins five or K -115 Pack Pilotrons to he is 227 and 224 types. Extra outstandingly superior! Variable resistance 'n- The constantly nlou cling of full 3 delivery 4s ears rated voltages front the Hear dozens of stations you never knew demand for Pilotrons various Ut Ps. Delivers up existed . short -wave broadcasts from required the purchase to 300 volts. Ultra-com- foreign countries . strange music of pact. Compete, ready for an additional tube use. surprises by the score the thrill of factory. Now, the trans -oceanic reception is now yours, plus general public. learning the convenience of A.C. operation. from radio technicians, insist: on Pilotrons. en- Special Note -The Battery-Operated dor -i it by professionals. Super -Wasp, Kit K -110, will con- tinue to be available. Cus- 9.50 ItADUO S tom Set - Builders' Price 82 11I1:I:EST 500 PILOT vu.1 -E brings you membership Push-Pull in Radio International OUTSTANDING Guild, including the AMPLIFIER official organ. Radio [Nor 2.15 Tubes] FEATURES Design -a construction Here's an am- $39 1- Complete kit -c;lo be assembled in a quarterly that sparkles A putier big v 1111..// single evening! with the latest and enough and greatest radio and short- p o w e r f u l 2- Employs the specially developed Pilotron enough for movie "Talk- 227 -the only :\.C. tube suitable for wave developments! irs" and public address short -wave detection! Current issue. together systems. Wherever ro- with Membership Pin, guiretnents dente nil max - Utilizes super -sensitive grid limon nmplification, free 3- screen tube. Card and Certificate,will from any hint of ilistor- 4 -Tunes from 14 to 500 meters. promptly sent on re- lion, this Pilot outfit is be recommended. All A. D 5- Operates from any ABC power pack of ceipt of remittance. ( and C voltages self -con- proper type. tained. Complete In RADIO DESIGN PUR. CO. semi-kit form (K -113). (Pilot K -111 is recommended, S16.50) Dept.l01, 103 Il,.ar, B4lya.N.Y. Prices Quoted are for Custom Set -Builders in U. S. A. Get Pilot's Latest Catalogue front nearest authorized Pilot Dealer or write Direct to Factory. EILOT RADIO &TIJBE CORP. WORLD'S LARGEST RADIO PARTS PLANT -- ESTABLISHED 1908 323 BERRY STREET / \ BROOKLYN, NEW YORK ev S L \\ ql, J9 e NMI" 1.tSii sievlo 4rs 441bOG- gQ vtt0<.t g=j9/ c1e pe4ßco° a, ..i _d -4'_4 9 6 ° eo1e vFeo1$°1Oet. ólei °14 ò .,00< o L*9. , a:e4fltllo!' . www.americanradiohistory.com December, 1929 RADIO -CRAFT et this .. CATALOG This big book of 148 -pages -rich from cover to cover with radio bargains -is yours for the asking. It contains all the latest radio devices and improvements - sets, accessories, parts and kits - profusely illustrated. No radio need is overlooked. Everything in this big book is available at wholesale prices, and many items are spotlighted as Specials at truly astounding reductions. To be without this book is to miss your greatest buying opportunity in radio. Every page points the way to money-sav- ing. Never before have such startling values been offered -made possible by our tremendous buy- ing power and low cost of operation. Quick deliveries and expert cooperation assured. to all our clients. A trial order will make you a reg- ular customer, just as it has thousands of our pleased customers. Clip the Catalog Coupon, and mail it today! SCREEN -GRID 7rice-Savina ao Models COUP" . Store Screen Chicago Salvage Stock Marvelous offerings in new, Humless, 130 Grid A. C. all -electric and battery operated sets; Dept. so. State Chlcago,Dt. 609 charge and postpaid) me of Bargams. a wide range of beautiful consoles, from the small your send Book of Radio table model types to the most ornate and artistic of your new 148-Page radio furniture; dynamic speakers of tremendous volume Name .. .................... and richest tone; accessories, parts and kits in wide variety ............... -in fact, everything that is standard, as well as every. Address......... State........... thing that is new, in Radio. Get this book today! City......... ........ CHICAGO SALVAGE STOCK STORE World's Largest Radio Store 509 So. State St, joeor. sao Chicago, Ill. www.americanradiohistory.com 242 RADIO -CRAFT December, 1929 H. CERNSBACK. President S. GERNSBACK. Treasurer VOLUME 1 J. M. HERZBERG. Vice- President NUMBER 6 I. S. MANHEIMER. Secretary adios a t R. D. WASHBURNE, for the C. P. MASON. Technical Editor Associate Editor Professional- Serviceman- Radiotrician HUGO GERNSBACK, Editor -in -Chief Money in Automobile Radio Contents of this Issue By HUGO GERNSBACK PAGE LEAVES FROM SERVICE MEN'S NOTEBOOKS ONE of the important new developments in radio that has By RADIO -CRAFT Readers 245 come about lately is the automobile radio set. From a LETTERS FROM SERVICE MEN 246 purely experimental stage, the car set has now been devel- MEN WHO MADE RADIO -Sir Oliver Lodge 247 oped to such a stage that, during the next few years, a tremendous NATIONAL LIST OF SERVICE MEN REPLY BLANK 247 new outlet for radio sets and radio parts will have been created. SOME PRESCRIPTIONS OF A RADIO DOCTOR And, incidentally, those who get in on the ground floor will, as usual, reap a rich harvest. By Paul L. Welker 248 WHAT IS RADIO'S GREATEST NEED FOR 1930? * * * * * By Service Men 249 AN important point to be remembered, not only by radio en- RADIO SERVICE DATA SHEETS 250 thusiasts but by the entire radio trade as well -is that the A MULTI -METER AND TESTER -By Louis B. Sklar 252 radio car set is an ADDITION to the natural consumption of radio SHORT -WAVE CRAFT -The Coast Guard's Best Short Wave sets; for the simple reason that the man who owns a radio at Receiver By S. R. Winters 253 home cannot take that set and install it into his car. It means R. an entirely new, as well as a different set. Of late, the car set C. A. SHORT -WAVE TELEVISION WORK 254 has taken the public's fancy; and several large manufacturers have SHORT-WAVE STATIONS AND THEIR SCHEDULES 255 announced their intention to equip their cars regularly with such VACUUM TUBES FOR RADIO RECEPTION -Part III sets for the coming season. Foremost among them is the Dodge By C. W. Palmer 256 Company. A COMBINATION WORK -BENCH AND TEST BOARD A radio set in a car today is a necessity, because it enables By A. Kronberg 258 one to keep in touch with what is going on while traveling be- tween cities, and even within cities. For the apprehension of RADIO -CRAFT KINKS 259 criminals, it is a most important adjunct to any police department. THE COOPERATIVE LABORATORY -By David Grimes 260 * * * * * THE RADIO CRAFTSMAN'S OWN PAGE -By Himself 262 PRACTICAL LITERATURE FOR RADIO READERS 263 AT one time, it was the custom to build such car sets behind the dashboard. This was a most cumbersome arrangement, NEW RADIO DEVICES FOR SHOP AND HOME 264 and will not prevail in the future. The new sets that are now be- SOLVING THE PROBLEM OF CITY AERIALS 265 ing installed in cars work on entirely different principles. The THE DEVELOPMENT OF THE MODERN SOUND REPRODUCER set is installed in a metal cabinet, similar to a tool chest, which is By O. C. Roos 266 attached right on to the running board. A flexible shaft goes to INFORMATION BUREAU 270 the dashboard, where the shaft connects with a single knob which is used as a tuning control. The shaft, by the way, is of the variety that dentists use to connect their motors to the dental drill. Aside from the one tuning knob, there is also a filament switch; these constitutes all the controls for the car's radio set. In Forthcoming Issues: The operation is simplicity itself; the switch is turned on and a station is tuned in. There is no volume control, and there is no Tri -Chromatic Television Herbert E. Ives necessity for having one; because the volume is controlled simply Notes for Radio Service Men Bertram M. Freed by detuning a trifle. This makes for great simplicity. While, Interference in the future, some refinements may be added, yet even the pres- -Its Origin, Location and Elimination F R. ent method is a good one. Bristow During the coming year, we will witness an epidemic of Experiments with 14- Centimeter Waves Ernst Gerhard radio sets for cars, which the various manufacturers will put out Servicing the Freshman "N" Harold Weiler complete and ready to install.
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