Radio broadcast .. (1922-30)

RADIO BROADCAST JULY, 1927 WILLIS KINGSLEY WING, Editor KEITH HENNEY EDGAR H. FELIX Director of the Laboratory Contributing Editor Vol. XI, No. 3 Cover Design From a. Design by Harvey Hopkins Dunn Frontispiece In the Radio Cabin of an EngJand-Egypt-India Airplane 134 The Aurora and Fading - Austin G. Cooky 135 The March of Radio An Editorial Interpretation 138 What the Radio Commission Is Accomplish- Radio Control Unsettled _in Australia ing Where Are the Listeners' Organizations? Radio Freedom of Speech Impossible Misuse of the Word "Broadcasting" What Stations Shall Be Eliminated? Probable Progress of Television Unnecessary Duplication of Radio Standards Two Announcements by the Westinghouse Why Important Events Can't Always Be Company Broadcast The Patent Situation Radio Reception Is No Longer Seasonal The Month in Radio A LowCost Battery Charger - - - James Millen 143 "Strays" from the Laboratory - - - - - - 146 Measuring Audio Amplifiers Articulation Curves A Fine British Magazine New Equipment Batteryless Receivers How to Build a 36-inch Cone - - - Warren T. Mithoff 148 Something About Single Control Edgar H. Felix 151 A Lamp Socket A, B, C Device - Gilbert Edgar 153 An A, B, C Power-Supply Unit for aoi-A Type Tubes Roland F. Beers 155 Receiver Design for A. C. Operation - Howard £. Rhodes 157 The Listeners'Point of View - John Wallace 159 Sunday Broadcasting Is Five Years Behind the British Listeners Want Lighter Broadcast Fare Times Thumb Nail Reviews How It Feels to Face a Microphone For the Microphone Miscellany First Time Communications A Combined Push'Pull Power Amplifier and Socket B Device The Laboratory Staff 163 A Portable Long-Wave Receiver - - - Keith Henney 165 As the Broadcaster Sees It Carl Dreher 167 The Place of Television in the Progress of Thirteen Years Ago Science Radio Revolutionized Again What the Broadcast Technic an Should Read , ,, ... Technical Problem for Broadcasters. No. a So lut '°" to Techmcal Problem No. i Technical Problem for Broadcasters. No. j Solution to Technical Problem No. 3 Description of a Short-Wave Station - - - C. R. Runyon, Jr. 171 "Radio Broadcast's" Laboratory Information Sheets - - 176 No. io! Measuring R. F. Resistance of a Coil No. 109 The Threshold of Hearing and Feel- No. 106 The ux-140 Type Tube ing in the Ear No. 107 Neutralization No. 110 Dry-Cell Tubes No. 108 High-Voltage Supply for no Type No. irr Index Tube No. in Index F^uipment for the Home Constructor - 182 Manufacturers' Booklets Available - - - - - 186 What Kit Shall I Buy? - - - 190 i AMONG OTHER THINGS. . . THIS issue of RADIO BROADCAST is almost an A.C. current supply number, for there is a wealth of information on the new methods for running vacuum tube filaments and supplying B and C potentials too. Although the four articles concerned do not total a great number of pages, they are the result of a great deal of laboratory work, and they contain plenty of information to aid the home constructor. Both the Raytheon and the Q. R. S. high-current rectifier units have been carefully tested for many weeks in the RADIO BROADCAST Laboratory under Howard Rhodes's direction and applied to receivers of various sorts. Much interest will also attach to James Millen's descriptions of the remarkable A battery charger tube developed in the Raytheon laboratory. THOSE of a theoretical turn of mind will find Austin Cooley's story dealing with the aurora and radio fading, as observed on the last MacMillan Arctic expedition, of consider' able interest. Mr. Cooley's deductions are ingenious and per- haps will cast considerable light on some of the problems of radio transmission. Neither RADIO BROADCAST, nor indeed, Mr. Cooley, regard the theory as more than an entering wedge. We hope other investigators may be encouraged to make actual long-time measurements which will give us a better basis for conclusion. RADIO men, traditionally, are argumentative souls and those who have turned their attention to the economics of the current supply of radio receivers will find some interest- ing figures on page 146 of this number. Our position is neutral, but discussion is interesting. OUR correspondents are constantly asking us for lists of radio reading matter, text book and periodical. A very helpful list of recent works is found on page 168 of this issue. There are, of course, many other standard books of value, many of which have in the past been reviewed in this magazine. RADIO BROADCAST for September will contain the first of an usually complete series of articles on the elimi' nation of interference. These articles are practical and definite and should help many a puzzled citizen to improve local re« ception. A shielded neutrodyne which can be built from stand- ard parts will be described in the same issue. It was designed by H. G. Reich, a member of the physics department at Cornell University. A beautiful 8o-meter code and phone transmitter will be described, also, and it will delight the heart of all of us who are interested in a compact efficient transmitter for this wave-band. MANY features of RADIO BROADCAST, as our readers have discovered and generously appreciated, are designed to supply regularly concise information which is not to be found elsewhere. The Laboratory Data Sheets were the first of these features of this nature, then "The Best in Current Radio Periodicals," the "Manufacturers' Booklets Available," and, with the June issue, we began a listing of kits for build- ing receivers, together with a brief technical summary of each. Information about kits can be secured through the Service Department of RADIO BROADCAST by exactly the same procedure that so many of our readers have followed with the manu- facturers' booklets. •— WILLIS KINGSLEY WING. Doubleday, Pate Sr Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN & HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL EL Eco FRONTIER STORIES WEST Doubleday, Page & Co. 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