Radio Broadcast (Nov 1926-Apr 1927)

RADIO BROADCAST NOVEMBER, 1926 Willis K. Wing, Editor Keith Henney Director of the Laboratory John B. Brennan Technical Editor Vol. X, No. 1 Cover Design <• *: From a Painting by Fred J. Edgars Frontispiece * > A 1014 Model Radio Telephone Transmitter The Radio Patent Structure and What it Means ' French Strother The March of Radio ' ' ' ' An Editorial Interpretation Looking Back Over Thirty Years of Radio Guglielmo Marconi High-Efficiency B'Battery Transmitters ' ' ' Keith Henney Constructing the R. B. "Lab" Receiver » ' ' John Brennan The Listeners' Point of View ' ' ' * ' ' ' John Wallace New Equipment *■'•''.-■>''*'''■>''<' Modernizing the Atwater Kent Model 20 Receiver James Millen A Short-Wave Super-Heterodyne Receiver George J. Eltz, Jr. A New Plan to Regulate Radio Broadcasting Carl Dreher "As the Broadcaster Sees It" The Technical and Scientific Aspects of Broadcasting Ralph Bown "Radio Broadcast's" Laboratory Information Sheets No. 41. The Super-Heterodyne No. 42. Super-Regeneration No. 43. Field Intensity Measurements No. 44. The R. B. "Local" Receiver No. 45. Diagram of the R. B. "Local" Receiver No. 46. Loud Speakers No. 47. Index No. 48. Index A Way of Increasing Selectivity A Key to Recent Radio Articles Harold Jolliffe E. G. Shalfyhauser Book Review » ' ' • ' ' »\ . * * ■< You re On The Air, Graham McNamee The "Radio Broadcast" Technical Information Service Illinois Section Stations Transmitting Weather Reports, Etc. 19 23 28 32 35 43 48 50 54 57 63 78 84 88 96 98 100 BEHIND EDITORIAL SCENES ' I 'HE October Radio Broadcast — the Metropolitan Shows number — was extremely well received at the New York and Boston radio shows and many were the sweet words of praise sung into our editorial ear. In point of content and quality, that issue is one of the most impressive of any radio magazine. And in the present number, there is a fine array of extremely interesting and valuable articles. Perhaps the one which will excite the widest interest is Mr. French Strother's, on the radio patent situation. No effort has been spared to make this series on the radio industry as accurate and correct as possible. More general uncertainty and lack of definite knowledge surrounds the radio patent question than perhaps any other branch of radio. The clarity of this article makes it extremely interesting and valuable. SENATORE MARCONI sketches in his own words in the article beginning on page 28 how wireless and radio have altered since the day of his earliest experiments. Particularly interesting is what he has to say about the courage it required to recommend the superseding of all the elaborate and expensive long-wave equipment for the short-wave beam. . . . The long awaited constructional article on the R. B. "Lab" circuit begins on page 3 5 and we are confident that our readers will find here a remarkably complete constructional article on a remarkable receiver. That set we are not hailing as a positive miracle in radio design; that is not either wise or necessary. But the design and operation of th : outfit alike speak sufficiently for it. ... A short-wave super-heterodyne has been the goal of many an amateur's designing efforts. On page 54, George J. Eltz, Jr. describes such an outfit which Major Armstrong said was to his mind about the ultimate in receiver design. The set on a small loop picked up Australian signals and while the world remains what it is, you can't go any farther than that. . . . James Millen has a helpful and complete article on how to modernize the Atwater Kent Model 20 which should interest radio service men and the many owners of that Model. RADIO BROADCAST for December will feature the third of French Strother's radio industry articles which attempts to indicate whither radio is drifting. Also the first of a series of constructional articles will start, describing a new and completely revised model of that very popular receiver, the Radio Broadcast Universal. Many of the old parts can be used in this improved model. Glenn H. Browning, the co-producer of the Browning-Drake circuit, has written a highly interesting article telling something about the various BrowningDrake circuits which have been presented to the set constructing public. He hopes to give the many who are confused as to what model to build, something to guide them, for it must be admitted that some of the claims we have seen for various models of the circuit are a bit confusing. It is going to be a good December number. — Willis K. Wing. Doubleday, Page Sr Co. MAGAZINES Country Life World's Work Garden & Home Builder Radio Broadcast Short Stories Educational Review Le Petit Journal El Eco The Frontier West Doubleday, Page Sr Co. 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