Radio Broadcast (May 1929-Apr 1930)

nruv -4 /g?g ©C1B 47811 RADIO BROADCAST WILLIS KINGSLEY WING .... Editor KEITH HENNEY . Director of the Laboratory HOWARD E. RHODES . . Technical Editor EDGAR H. FELIX . . . Contributing Editor VOL. XVI. NO. 1 PUBLISHED FOR THE RADIO INDUSTRY Contents for November, 1929 MERCHANDISING SECTION The Radio World's Fair ------------ 11 Views of Nine New Receiver Chassis ------- 13 Let's Look at Radio's Largest Year T. A. Phillips 14 What Made This Dealer Succeed Edgar H. Felix 16 Service — Do You or Your Customers Pay? John S. Dunham 18 Tested Sales Ideas ---- Merchandising Shorts 20 Tying in with Factory Adver A Novel Sales Stunt tising An Automobile as a Sales The Gas Station Is a Prospect Builder Selling Radio ------ Howard W. Dickinson 22 Professionally Speaking - - - Keith Henney 24 Problems for Standards Com Our Service Problem mittees Yesterday, To-day, and To-morrow What Dealers Suggest 25 What They Say - - - Interesting Letters 27 A Good Side Line for Radio The Time Payment Problem Dealers How Sales by States Compare - - - - - 27 The March of Radio An Editorial Interpretation 28 If Automobile Dealers Sell The New Monitoring Station Radio Radio's Largest Chain Store More Patent Difficulties on the Radio Commission Reorganized Way The Tube Business News of the Tube Industry 30 Views of the Hazeltine Laboratories - - - - 31 News of the Radio Industry - - - - - 32 In the Radio Marketplace Offerings of Manufacturers 36 The Serviceman's Corner - - - - - 38 Strays from the Laboratory ---- Technical Shorts 40 A.R.C. Radio Altimeter Advice to Students Linear Detection Screen-Grid Ratings ENGINEERING SECTION Characteristics of A.F. Transformers H. M. Turner 43 Designing the Power Supply Circuit Richard F. Shea 47 Linear Power Detection Frederick Emmons Terman 49 "Radio Broadcast's" Set Data Sheets - - - 51 The GilfiUan Model 100 The Kennedy Model 10 An Efficient Radio Set Diagnoser Herbert M. Isaacson A High-Resistance Voltmeter Substitute Frederic B. Fuller The Stewart-Warner Series 950 A. C. Matthews Band-Pass Filter Design ------ E. A. Uehling Radio Broadcast Laboratory Information Sheets Howard E. Rhodes No. 304. Distributed Capacity No. 306. Advantages of AutoMeasurements matic Volume Control No. 305. Distributed Capacity Measurements The contents of this magazine are indexed in The Readers' Guide to Periodical Literature, which is on file at all public libraries . among other things Now that the two largest public radio shows — those in New York and Chicago — have been held, it is worth while pointing out that the exhibitions did full justice to the merchandise offered by manufacturers this year. That was to be expected, but the more interesting point is that the public did justice to the shows, too. With an astounding number of paid admissions to the shows in both cities, we have ample evidence that radio has the strongest of holds on the public. Great attendance does not mean that every buyer of "a coveted pasteboard" for admission will immediately rush to the nearest dealer and open his heart and checkbook. But it does mean that dealers can be certain that they do not lack for prospects. It may be observed in a still small voice that may be heard through the current verbal sales excitement about screen-grid tubes and their good works that the use of these tubes is also responsible for the greatly decreased a.c. hum which is an important but not much-stressed feature of this year's models. Screen-grid tubes properly used mean plenty of r.f. amplification, and plenty of amplification before the detector means that only one audio stage is required. And less amplification in the audio side means decreased hum. The hum is no longer a serious problem of the sales groups and the designers have been freed of these worries by this unexpected benefit of the proper use of this tube. Those who are interested in trends — and who isn't? — will find our summary of exhibits at the NewYork show and its comparison with exhibits at the earlier Trade Show of interest and probably considerable use. Coming issues will contain a variety of articles of use to those who sell radio. These will discuss such subjects as the future of the jobber, where trouble is apt to develop in house-to-house selling, how a successful merchant manages his sales staff, the present trend in time-payment selling, how color can best be used in window display, what the dealer thinks about factory newspaper tie-in advertising, and something about the wide variety of outlets now handling radio. The engineering section will present, among many others, articles on the pentode tube, economy in power supply circuit design, a discussion of the relation between cost and permissible performance tolerances, and a design description of the Philco 95 receiver. — Willis Kingsley Wing. TERMS: $4.00 a year; singlp copies 3S cents; All rights reserved. Copyright, 1929, in the United States, Newfoundland, Great Britain, Canada, and oilier countries by DOUBLEDAY, DORAN & COMPANY, INC., Garden City, New York MAGAZINES . . . Country Life . . World's Work . . The American Home . . Radio Broadcast . . Short Stories . . Le Petit Journal . El Eco . . West BOOK SHOPS (Books of all Publishers) . . . New York: <Lord & Taylor, James McCreery & Company, Pennsylvania Terminal, 166 West 32nd St., 848 Madison Ave., 51 East 44th Street, 420, 526, and 819 Lexinoton Avenue, Grand Central Terminal, 10 Wall Street> Atlantic City: <2807 Boardwalk> Chicago: <75 East Adams Street> St. Louis: <223 N. 8th St. and 4914 Maryland Ave.> Cleveland: <Higbee Company> Sprincfield, Mass: <Meekins, Packard & Wheat. OFFICES . . . Garden City, N. Y. New York: 244 Madison Avenue. Boston: Park Square Building. Chicago: Peoples Gas Building. Santa Barbara, Cal. London: Wm. Heinemann, Ltd. Toronto: Doubleday, Doran & Gundy, Ltd. OFFICERS . . . F. N. Doubleday, Chairman of the Board; Nelson Doubleday, President: George H. Doran, Vice-President; Russell Doubleday, Secretary; John J. Hessian, Treasurer; Lillian A. Comstock, Asst't Secretary; L. J. McNaughton, Asst't Treasurer 8 • • NOVEMBER 1 9 29 •