Radio Broadcast (May 1929-Apr 1930)

JUN -6 1929 CIB 31033 WILLIS KINGSLEY WING .... Editor KEITH HENNEY . Direclor of the Laboratory HOWARD E. RHODES . . Technical Editor EDGAR H. FELIX . . . Contributing Editor RADIO BROADCAST PUBLISHED FOR THE RADIO INDUSTRY VOL. XV. NO. 2 Contents for June, 1929 Frontispiece Interesting Pictures of the Month 68 The Trend in Cabinet Design R. H. Langley 69 The March of Radio An Editorial Interpretation 72 Can Radio Recome a Style Regarding Direct Radio AdverProduct? tising Tube Makers Sign R.C.A. License Improvements in 1929-30 Receivers Views of Leading Executives 74 Pick-Ups — A Worth-While Accessory ------ 77 What the Licensing Groups Offer Hazeltine, R.C.A. , R.F.L., and Technidyne 78 What They Say The Month's Best Letters 80 Judging the Merits of a New Set Harry Alter 81 Progress in Loud Speaker Design Four Acoustic Engineers 84 1929— The Year of 100,000,000 Tubes ------ 85 A Game for Radio Dealers S. Gordon T. Parks 86 Radio Shop Practice ---- Mary Texanna Loomis 87 In the Radio Marketplace Items of Trade Interest 90 The Radio Dealer's Note Rook - - - - 93 The Inductor-Dynamic Loud Speaker R. H. Dreisbach 94 Routine Plate Circuit Testing John S. Dunham 96 " Radio Rroadcast's " Set Data Sheets - - - 99 The Spartan Receivers The Freshman Model QD-16-S All-American Mohawk Receiver Strays from the Laboratory ---- Keith Henney 101 Trends in 1929 Receiver Design Humps in Audio Transformers Data on Electrostatic Speakers ShortWave Schedules How Much is an Engineer Worth? Resourcefulness of an Engineer Power Requirements in England Dr. Goldsmith Resigns as Editor The Experimenter's Armchair Robert S. Kruse 103 A German Portable Receiver A 110-volt Potentiometer An Improved Oscillator The I.R.E. Patent Digest Miniature Current Transformer Letters are Welcome "Radio Rroadcast's" Home-Study Sheets ---- 105 No. 23. Radio-Frequency Oscil No. 24. Measuring Capacity la tors A Simple Two-Tube V.T. Voltmeter -Howard E. Rhodes 107 Improvements in the 227 Tube F. X. Rettenmeyer 108 Complete List of R. C. A. Licensees ------ 108 Rroadcast Engineering ------ Carl Dreher 109 The Serviceman's Corner - no Radio Broadcast Laboratory Information Sheets Howard E. Rhodes 116 No. 283. HumVoltage Character No. 285. Frequency Vs. Capacity istics and Inductance No. 284. Hum-Voltage Character No. 286. Frequency Vs. Capacity istics and Inductance No. 287. Protecting Meters The contents of this magazine is indexed in The Readers' Guide to Periodical Literature, which is on file at all puhlic libraries among other things Here we are at the start of another radio season. How will it compare with other seasons? What are the manufacturers' offerings? What are the trends? In short, how is the radio world going? In the issue now before you, we have tried to provide answers to most of these questions, written by those who are in a large measure responsible for our present advancement. The price tendency this year is perhaps the most obvious: manufacturers are giving more value for less money in 1929 than they did in 1928. The sets, from those in the lowest price class to those selling for the highest figure, give improved performance and are generally better values. At least one leading maker offers in his list price the entire receiver equipment: set, loud speaker, cabinet, and tubes. This, in our opinion, is a step of great importance and we believe the practice in time will become more general. The radio sets themselves, although they do not differ materially from those offered in previous years, are definitely improved in exterior appearance. "Beneath the hood," they contain a great number of improvements, which, while not sensational, represent engineering advance, and show that the design engineers have not been idle. All receivers are basically the same yet each has its individual technical points of difference. The engineers now know how to measure these differences and can tell exactly what the real performance of the set is. Models are now thoroughly tested, measured, taken apart, redesigned, and put together again before being put into production and offered to the dealer and to the public. Radio manufacture, in short, is a much more exact operation than ever before. From this, the entire industry benefits, and the public, praises be, receives more for its investment. Howard W. Dickinson, formerly executive vicepresident of the George Batten Company, and a nationally known authority on merchandising problems, begins a series of intensely interesting articles in the July Badio Broadcast. These articles, warmly personal and sympathetic, will offer some new and distinctly helpful ideas on radio selling. In addition to many other helpful articles for those who sell radio, our technical section in July will contain the finest line-up of material it has ever been our pleasure to present. For the first time anywhere, we offer in that issue complete technical descriptions of three well-known commercial receivers; a splendid article on loud speaker measuring methods; definite data on the 245-type tube, and numerous other special features. — Willis Kingsley Wing. TERMS: $4.00 a year; single copies 35 cents; All rights reserved. Copyright, 1929, in the United Stales, Newfoundland, Great Britain. Canada, and other countries by MAGAZINES . Country Life . DOUBLEDAY, DORAN & COMPANY, INC., Garden City, New York Radio Rroadcast Short Stories . . Le Petit Journal El Eco \\ ] s I New York: <Lom World's Work . . The American Home HOOK SHOPS (Hook of all Publishers) . . . & Taylor, James McCreery & Company, Pennsylvania Terminal, 166 West 32nd St., 848 Madison Ave., 51 East 44th Street, 420, 526,and 819 Lexinciton Avenue, Grand Central Terminal, 10 Wall Street> Atlantic City: <2807 Boardwalk> Chicago: <75 East Adams Street> St. Louis: <223 N. 8th St. und 4914 Maryland Ave.> Cleveland: <Higbee Company> Springfield, Mass: <Meekins. Packard & Wheat. OFFICES ... Garden City, N. Y. New York: 244 Madison Avenue. Boston: Park Square Ruilding. Chicago: Peoples Gas Building. Santa Barbara, Cal. Ix>ndon: Wm. Heinemann, Ltd. Toronto: Doubleday, Doran & Gundy, Ltd. OFFICERS . . . F. N. Doubleday, Chairman of the Hoard; Nelson Doubleday, President; S. A. Everitt. Vice-President; George II. Doran, Vice-President; Russell Doubleday, Secretary; John J. HESSIAN, Treasurer; Lillian A. CoMSTOCK, Assl't Secretary; L. J. McN ujghton. Ass ft Treasurer 64 • • JUNE -1 929 •