Radio Broadcast (Nov 1926-Apr 1927)

RADIO BROADCAST FEBRUARY, 1927 Wans K. Wing, Editor Keith Henney John B. Brennan Director of the Laboratory Technical Editor Edgar H. Felix, Contributing Editor Vol. X, No. 4 Cover Design Frontispiece From a Painting by Fred J. Edgars Radio Nflw Aids the Manner 350 Linking Continents With Twenty Kilowatts The March of Radio ' Why Short Waves Should Not Be Opened to Broadcasting Failures in the Broadcasting Tax System The Useless Newspaper Radio Program The Courts Aid in Radio Tangle Constructive Work hy the Bureau of Standards How They Solve Interference Problems Abroad Some Experiments on One Meter ' ' Farther Notes on the Inverse Duplex System A Four-Tube "Lab" Receiver ' ' Looking for Trouble? The Listeners' Point of View Kenneth B. Humphrey 351 An Editorial Interpretation 356 Bringing Classical Music to the People Radio Fills Empty Church Pews How the Cable Companies Look on Radio Bureaucratic Meddling with Broadcasting Why the Poor Engineer Is Poor The Month in Radio Howard E. Rhodes 361 David Grimes 365 John B. Brennan 368 ' Edgar H. Felix 372 ' John Wallace 374 Much Sound and Fury About Radio Education How a Great Symphony Is Broadcast Overlapping of First Rate Program Features Should Be Avoided Broadcast Miscellany What Does the Listener Like in Radio Programs? Practical Applications of Some New Equipment The Laboratory Staff 378 A. C. Operated Amplifier-Power Supply Devices James Millen 381 Notes on the Shielded Dual-Control Receiver McMurdo Silver 386 As the Broadcaster Sees It ' Carl Dreher 389 The Broadcast Program — Pinnacle of Imper manence The Broadcaster and the Public The SOS Question Again A. C. as a Filament Supply Source Radio Broadcast's Laboratory Information Sheets Broadcasting and Shows Personal Note by the Author Technical Operation of Broadcasting Stations 2 Studio Field Change-Overs B. F. Miessner No. 65 The Vacuum Tube Voltmeter No. 66 A Radio-Frequency Oscillator No. 67 171 Tube Characteristics No. 68 Curves for ux-171 Tube No. 69 Sources of Electrons No. 70 Soldering No. 71 Push-Pull Amplification No. 72 Line Power-Supply Devices New Equipment ' ' ,,,,,,,,,,, Manufacturers' Booklets Available ' » ' Radio in Turkey M. Mazloum A Key to Recent Radio Articles ' ' ' E. G. Shalkjiauser The Radio Broadcast Technical Information Service ' ; Book Reviews ' ' * "»•>>■.. y Audio Amplificafion Sam '>{ Henry. Reviewed by John Wallaz-. 393 404 410 412 416 420 434 436 BEHIND EDITORIAL SCENES IF WE can judge from the correspondence which has been coming into the office recently, radio folk are at present most interested in what steps are to be taken to clear the air and unravel the p esent serious broadcast tangle. Almost every letter we receive — and our mail man always has a full load — has something strong to say about the present situation and expresses the hope that something many be done. No one can forecast what will happen in Washington where the legislators meditate suitable legislation, but every reader who wants "something to be done" should write his opinions with a plea for action to his Congressman. The people are the Government and letters to our Washington representatives are the best way to make one's feeling felt. It may be that legislation will be passed even before this magazine reaches the hands of the reader, but at present, that happy event seems but distantly possible. The leading editorial in "The March of Radio," dealing with proposals for widening the broadcast band, is worthy of very careful reading. THE questionnaire in the "Listeners' Point of View" in the January magazine has provoked a large number of extremely interesting replies and it is reprinted on page 376 of this issue for the benefit of those who did not fill out that printed in the January number. It is not possible to acknowledge and thank every reader who sent us the filled out questionnaire, but we greatly appreciate the fine interest and cooperation of the many who went to considerable trouble to reply. The January listing of many excellent booklets published by various radio concerns has attracted wide interest. An extraordinarily large number of readers have returned the coupon requesting some of the booklets, which are sent without charge. A more complete list is published in this number. QUOTATIONS from Senatore Marconi's description of his new beams system, contained in Mr. Humphrey's 'leading article, are printed in detail for the first time in this country. Much of the description, too, has not heretofore been released in the United States. THE second of, David Grimes's excellent descriptions of his improvements on his Inverse Duplex System appears in this issue and his third article appears in the March Radio Broadcast. Experiments have been taking place in the Laboratory to improve the four-tube R. B. "Lab" receiver. The changes described in the article beginning on page 368 are not extensive but they are important. This model is one of the finest receivers we have ever used and we welcome correspondence from readers detailing their experience with this set. Edgar Felix's article on page 372, "Looking for Trouble?" should offer great help to the "average radio fan" who is called upon to "shoot trouble" in his own outfit or those of his friends. The information there can also be applied with great profit by radio dealers and others who are called upon to put an ailing set in order. IN MARCH, the second of James Millen's constructional articles on B-power supply units appears, as does a constructional article on the Grimes receiver, a constructional article on adding power supply to the Hammarlund-Roberts "Hi-Q," and many other articles of wide interest. ■ — Willis K. Wing. Doubleday, Page Gr Co. MAGAZINES Country Life World's Work Garden & Home Builder Radio Broadcast Short Stories Educational Review t-E Petit Journal El Eco I-rontier Stories West Doubleday, Page Sr Co. BOOK SHOPS (Books 0/ all Publishers) I Lord & Taylor \ Pennsylvania Terminal (2 Shops) New York < Grand Central Terminal I 38 Wall St. and 526 Lexington Ave. \ 848 Madison Ave. and 166 West 32ND St. St. Louis: 223 N. 8th St. and 4914 Maryland Ave. Kansas City: 920 Grand Ave. and 206 W. 47TH St. c.i eveland: Hicbee Co. Springfield. Mass.: Meekins. Packard & Wheat Doubleday, Page Sr Co. OFFICES Garden City, N. Y. New York: 285 Madison Ave. Boston: Park Square Building Chicago: Peoples Gas Building Santa Barbara, Cal. London: Wm. Heinemann Ltd. Toronto: Oxford University Press Doubleday, Page Sr Co. OFFICERS F. N. Doubleday, President A. W. Page, Vice-President Nelson Doubleday, Vice-President Russell Doubleday, Secretary S. A. Everitt, Treasurer John J. Hessian, Asst. Treasurer VOUBLEDAT. 'PAGE & COMPACT, Garde?: City, Hew Tor\ Copyright, 1927, in the United States, >{tu;/ounJIund, Great Britain, Canada, and other countries by Doubleday, Page & Company. All rights reserved. TERMS: $4.00 >i year; single copies 35 cents. 348