Radio broadcast .. (1922-30)

RADIO BROADCAST NOVEMBER, 1927 WILLIS KINGSLEY WING, Editor KEITH HENNEY EDGAR H. FELIX Director of the Laboratory Contributing Editor Vol. XII, No. 1 Cover Design - ' - From a Design by Harvey Hopkins Dunn Frontispiece - Proper Radio Equipment on an Airplane 10 What's the Trouble With Aircraft Radio? ».•».» Anonymous 11 The March of Radio An Editorial Interpretation 14 What's the Matter With Radio Advertising? Action from the Federal Radio Commission Prospects for Patent Pooling Is Direct Advertising a Service? Radio Engineering Today News of the Patent Field The Month in Radio Meters, Kilocycles, or "Channel Numbers"? - Ralph H. Langley 18 Radio Receivers for $175 or Less 19 Loud Speakers and Power Equipment - - - 2,2 How the Cooley "Rayfoto" System Works Austin G. Cooley 23 Refinements of the Modern Radio Receiver - - Edgar H. Felix 26 What is a Good Radio? Keith Henney 28 Do You Own a Battery Operated Set? - - Howard E. Rhodes 30 Electrifying the Browning-Drake James Millen 33 Our Readers Suggest. .. . - ' 35 Listeners—Guests or Customers? John Wallace 37 The Listeners' Point of View The R.G.S. "Octamonic" Circuit - - - - David Crimes 39 The Freshman "Equaphase" Circuit - ••*-*/. O. Mesa 42 The Improved Shielded Six - John E. McClure 44 The Improved Aristocrat Arthur H. Lynch 46 Suppressing Radio Interference A. T. Lawton 48 As the Broadcaster Sees It - - - - CarJ Dreher 50 Putting Freak Broadcasting In Its Place Abstract of Technical Article Background Noises Auditorium Acoustics "Radio Broadcast's" Laboratory Data Sheets 56 No. r37 Operating Vacuum Tubes in Parallel No. 141 Obtaining Various Voltages from a No. 138 The Unit of Capacity B-Power Unit No. r39 Inductive Reactance No. 143 Solenoid Coil Data No. 140 Coil Reactance No. 144 The Transmission Unit No. 141 A. C. Tube Data Manufacturers' Booklets Available 62 What Kit Shall I Buy? 66 "Radio Broadcast's" Directory of Manufactured Receivers - - - 70 A Key to Recent Radio Articles - - - - E. G. Shal1{hauser 76 AMOT^G OTHER THINGS. . . "DOR more reasons than one, the New York Radio Show is 1- generally accepted as the event which crystallizes interest in all things radio. This is written as the show closed and a more impressive show we have never seen. "Impressive" from the point of view of the exhibits, certainly, but more impressive be- cause of the tremendous interest in all things radio demonstrated by all sorts and conditions of people who thronged Madison Square Garden. Careful observation of the crowds and their interest indicated that while the complete sets drew much at- tention, the home-assembled receivers—built from kits, were equally interesting. This definite and lively interest in the home-built sets is especially important in view of the pronounce- ments of some knowing radio sages who aver that home building is seriously on the decline. A CTUAL transmission and reception of "still" pictures by ./V. radio was demonstrated thousands of times during the week of the show by Austin G. Cooley who set up a complete Cooley "Rayfoto" transmitter and receiver in a special booth provided through the courtesy of G. Clayton Irwin, Jr., manager of the show. The picture converter or transmitter was set up. connected to a small radio transmitter and through a standard broadcast receiver, the pictures were received with great rapidity and success before the very eyes of eager crowds. The simplicity and speed of the receiver astounded those who saw the demonstration, and every visitor was eager to know when he could build the apparatus and how soon pictures would be sent and where he could get information. Experimental picture transmissions from various broadcasting stations will be sent even before you read these words; complete information on how the system works, how to build and operate it appears exclusively in this and following issues of RADIO BROADCAST. And those who wish to receive printed matter describing details of the system should at once address a letter to the undersigned who will see that all information is mailed at once. The impressive success of the Cooley "Rayfoto" demonstration proves beyond all question that a new era has dawned for the home experimenter, and to be frank, we are as enthusiastic over the possibilities opened up as the keenest of experimenters. A WORD about the authors in this issue: the anonymous -ti. author of the absorbing leading article is a very well-known figure in aviation and radio. Ralph Langley, who explains his scheme for numbering broadcast channels, is executive assistant to the president, Crosley Radio Corporation. He was until recently in charge of receiver design for the General Electric Company. Howard E. Rhodes who describes what's new in A-power units is one of the able technical staff of this magazine. James Millen, who is a consulting engineer and a native of Long Island, will shortly desert these parts and settle in Boston. TN THE next issue we shall have an important article by T. H. 1 Nakken on the shielded grid tube indicating what such a tube means to American radio .There will be valuable constructional articles and a description of the technical features of well known manufactured receivers—information never published before. Austin Cooley will tell how to build a Cooley "Rayfoto" receiver—facts for which many experimenters are waiting. — WILLIS KINGSLEY WING. Doubleday, Page & Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN & HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL EL Eco FRONTIER STORIES WEST WEEKLY Doubleday, Page &• Co. 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