Radio broadcast .. (1922-30)

RADIO BROADCAST OCTOBER, 1926 WILLIS K. WING, Editor KEITH HENNEY Director of the Laboratory JOHN B. BRENNAN Technical Editor Vol. IX, No. 6 How to Select Your 1927 Receiver Meet Mr. Average Radio Enthusiast Richard Lord Edgar H. Felix Kingsley Welles "Radio Broadcast's" Laboratory Information Sheets No. 3J Tandem Tuning No. 34 Series Connecting of Filaments No. jj Radio Frequency Transformers No. 56 The Super-Heterodyne No. 37 Single Side Band Transmission No. 38 Neutralization No. 39 Field Intensity Measurements No. 40 Analysis of Detection • Thomas Stevenson Who Is to Control Broadcasting? Constant Frequency Stations How to Improve Your Neutrodyne Thorp Hiscocl{ Book Review • Keith Henney Radio Frequency Measurements, E. B. Moullin The Microphone H. /. Round "Now, I Have Found" The "Radio Broadcast" Technical Information Service Letters from Readers The Geneva Plan Lawrence W. Corbett A Key to Recent Radio Articles E.G. Shalkhauser 470 474 Cover Design From a Painting by Fred J. Edgars Frontispiece Radio Aboard a Channel Air Liner Is There a Radio Monopoly? French Strother The March of Radio An Editorial Interpretation How to Build the Equamatic Five'Tube Receiver Zeh Bouct{ 479 Radio With the Dyott Brazil Expedition 483 An A, B, C Line Supply Device • B. F. Roland 485 The Listeners' Point ofView John Wai/ace 490 A Shielded Dual-Control Receiver McMurdo Silver How to Measure Your Own Tubes Keith Henney Afire at Sea Walter Meade Wi/iia?ns As the Broadcaster Sees It • Carl Dreher He Gave a Lusty Voice to Radio Myra May Cone Loud Speakers C. L. Farrand METROPOLITAN SHOWS SECTION Bringing the Radio Shows to the Country What's New at the Radio Shows Edgar H. Felix Parts of Real Quality Dominate the New Season's Lines 494 499 504 506 510 5i8 523 529 531 566 572 575 576 579 580 582 585 586 588 590 B-EHI^D EDITORIAL SCENES XJOT only is this issue, the Metropolitan Shows Number •*• ' of RADIO BROADCAST, by far the largest in point of editorial content, but it is certainly the most interesting we have presented our readers in many months. Although a special effort has been made to present in advance of the radio shows as much information as possible about what the visitor will see there and a special section of the magazine has been devoted to the radio shows, no change whatever has been made in the usual number of pages and quality of the regular section of the magazine. . . . Everyone, whether he knows anything about radio technically, or not, should find French Strother's article "Is There a Monopoly in Radio?" of deep interest. Mr. Strother, an associate editor and special writer on the staff of World's Wor(;, is nationally known as one of the ablest special writers in the country. We believe that his series of three articles on the radio industry, of which this is the first, will be read with wide and deep interest. 'T'HERE are four articles in this issue of great value to the •*• home set builder. The first is a description by Zeh Bouck of a five-tube tuned r. f. set using the King Equamatic system. The second is constructional data on a fine power supply device, prepared by B. F. Roland, which furnishes A, B, and C potentials to the radio receiver. Many constructors have long awaited a dependable unit and we have no hesitation in saying that this will satisfy their requirements. McMurdo Silver's description of the construction and assembly of a six-tube completely shielded receiver provides the home builder with a set embodying all the latest and approved constructional ideas. And another of Keith Henney's articles on vacuum tubes appears on page 499. This series of tube articles have attracted more attention than almost any of the strictly technical articles ever printed in RADIO BROADCAST. "K TOW for the November RADIO BROADCAST. The second of •*• ^ French Strother's articles on the radio industry will appear. Our feature constructional article will tell how to build the RADIO BROADCAST Lab. receiver, which many of our readers have awaited eagerly. George J. Eltz, Jr. has written an extremely interesting description of a short-wave superheterodyne which works on a small loop extremely well. The short-wave "super" is something the amateur has been attempting to perfect for a long time. This model is not hard to build and should attract wide attention. In addition to these articles of special interest there will be an interesting story by Senatore Marconi and a bookful of other articles which have made so many readers of RADIO BROADCAST say they would never miss a copy. —WILLIS K. WING. Doubleday, Pail Sr Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN A HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL EL Eco THE FRONTIER WIST NEW YORK: Doubleday, Page &• Co. BOOK" SHOPS (Books of all Publishers) iLoRD & TAYLOR BOOK Snor PENNSYLVANIA TERMINAL (2 Shops) 38 WALL ST. AND too WEST 32ND ST. GRAND CENTRAL TERMINAL <-T in,,,.. I «) NORTH STH STREET ' ) 4014 MARYLAND AVENUE KANSAS TITY f 9JO G|(*ND AVENUE KANSAS CITY, j ^ WEST ^H STRKT CLEVELAND: HIIJBEE Co. SPRINGFIELD. MASS.: MEEKINS, PACKARD* WHEAT Doubleday, Page ty Co. OFFICES GARDEN CITY, N. Y. NEW YORK: 285 MADISON AVENUE BOSTON: PARK SQUARE BUILDING CHICAGO: PEOPLES GAS BUILDING SANTA BARBARA, CAL. LONDON: WM. HEINEMANN, LTD. TORONTO: OXFORD UNIVERSITY PRESS DOL/BLEDAT, 'PAGE & QOMPA^T, Garden Qity, Doubleday, Page & Co. OFFICERS F. N. DOUBLEDAY, President A. W. PAGE, yia-Prtsident NELSON DOUBLEDAY, yice-President RUSSELL DOUBLEDAY, Secretary S. A. EVERITT. Treasurer JOHN J. HESSIAN, Aat. Treasurer Ctpyrifhl. 1926, m UK United Suiei, Newfoundland, Great Britain, Canada, and other countriei by Doubleday, Page &• Company. All right! reserved. TERMS: $4.00 a year; iingle copiei 35 centi. 458