Radio broadcast .. (1922-30)

RADIO BROADCAST ARTHUR H. LYNCH, Editor WILLIS K. WING, Associate Editor JOHN B. BRENNAN, Technical Editor DECEMBER, 1925 Vol. VIII, No. 2 Cover Design From a Painting by Fred J. Edgars Radio Enters the Club Frontispiece How Radio Grew Up Robert H. Marriott Tubes: Their Uses and Abuses Keith Henney The March of Radio J H Morecro/t A Five'Tube Receiver of Dual Efficiency Glenn H. Browning The Listeners' Point of View Kingsley Welles Short Waves — A New Paradise for the DX Fan Edgar H. Felix Plans for the Third of the International Radio Broad' cast Tests *•*.**•• Arthur H. Lynch An Improved Plate Current Supply Unit Roland F. Beers As the Broadcaster Sees It Carl Dreher The "Aristocrat" Receiver: Resistance'Coupled Amplification '»*»..*•' How to Use Meters in Your Receiver James Millen New Fields For the Home Constructor Keith Henney "Now, I Have Found" Tracing Radio Noises A Ratchet Coil Winder A Coupling Device for the Roberts Circuit A File for Ideas Super-He'erodyne Noises Checkii t* up on B-Battery Leakage A Vark meter for the Roberts Set How to Eliminate Local Interference A List of Australian Broadcasting Stations The Grid — Questions and Answers Coil Placement in an R. F. Amplifier Precautions in Antenna Erection Measuring the Resistance of Coil Units Matching Tubes and R. F. Coils A Key to Recent Radio Articles E. G. Shalkhauser 159 163 * 167 172 177 182 185 186 191 196 198 201 206 Is Your Set a Blooper? What Our Readers Write Us 212 224 226 232 238 244 BEHIND THE EDITORIAL SCENES THE new and enlarged RADIO BROADCAST has met with almost universal favor and its reception was even more hearty than the publishers had dared hope. In New York City alone, the supply of the November number was exhausted four days after it was placed on sale. Copies of the number are so rare that we haven't more than three copies in the editorial offices for our own use. Letters from readers all over the country have been most generous in praising the appearance and contents of the November number. ROBERT H. MARRIOTT, whose article, "How Radio Grew Up" leads this issue, is one of the old men of wireless in the United States. He was the first president of the Institute of Radio Engineers, was one of the first radio inspectors to be appointed after the radio law of 1912 was passed. For a long time he was expert radio aide at the Bremerton Navy Yard, Washington, and is now a consulting radio engineer in New York. . . . Edgar Felix, who writes about short waves in this number, was for several years publicity representative of station WEAF in New York. Glenn H. Browning, who with his inseparable technical partner, Mr. F. H. Drake, has become nationally known for the Browning-Drake receiver, describes a great improvement over the early model in this number. Both Mr. Browning and Mr. Drake are familiar figures around the famous Cruft laboratory at Harvard University, where much of their work has been done. The valuable current periodical surveys, made by E. G. Shalkhauser, the first of which appeared in our November issue, are continued in this number. Many readers have written us saying that these condensed surveys of the important articles appearing in this magazine and in our contemporaries are of great value to them. THE January RADIO BROADCAST will contain an article by Arthur H. Lynch telling how to build "RADIO BROADCAST'S Universal Receiver." The set he describes is an unusual and very efficient combination of standard parts and it is doubtful if there is any receiver its superior in point of sensitivity and quality. It is not a "freak" outfit in any sense. Kendall Clough of Chicago will have an article about the principles of audio amplification which is of particular interest. The author weighs and casts aside some of the commonly accepted theories of amplification. We believe the article will attract a great deal of attention. Mr. John Wallace of Evanston, Illinois, will from now on write the "Listeners' Point of View." With his central location, Mr. Wallace is able to hear broadcast offerings in almost every part of the United States and Canada. Our new broadcast critic is an unusually versatile person, for he is a writer of great charm and not a little wit. as well as an artist of considerable ability. In his college days, his drawings and humorous "pieces" appeared in the Cornell Widow. rT"(HE advertising pages of the magazines of the "Quality JL Group," that is, the Atlantic Monthly, Harpers, Review of Reviews, Scribners, and the World's Worf; now contain only the announcements of those radio manufacturers whose products have been tested and approved by the Laboratory of RADIO BROADCAST. Readers of those magazines who are not well versed in matters radio have the privilege of calling on the technical staff of this magazine for help and advice. Doubltday, Page fir Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN & HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL EL Eco THE FRONTIER NEW YORK: ST. Louis: Doubleday, Page Sr Co. BOOK SHOPS ("LORD & TAYLOR BOOK SHOP I PENNSYLVANIA TERMINAL (2 Shops) I 38 WALL ST. (.GRAND CENTRAL TERMINAL [223 NORTH STH STREET 4914 MARYLAND AVENUE AS rrrv t 920 GRAND AVENUE KANSAS CITY, j Jo6 WFST 4?TH STREET TOLEDO: LASALLE & KOCH CLEVELAND: HIGBEE Co. SPRINGFIELD, MASS. : MEEKINS, PACKARD & WHEAT Doubleday, Page & Co. OFFICES GARDEN CITY, N. Y. NEW YORK: 120 WEST 32ND STREET BOSTON: PARK SQUARE BUILDING CHICAGO: PEOPLES GAS BUILDING SANTA BARBARA, CAL. LONDON: WM. HEINEMANN LTD. TORONTO: OXFORD UNIVERSITY PRESS Doubleday, Page &• Co. OFFICERS F. N. DOUBLEDAY. President A. W. PAGE, Vice-President NELSON DOUBLEDAY, Vice-President RUSSELL DOUBLEDAY, Secretary S. A. EVERITT, Treasurer JOHN J. HESSIAN, Asst. Treasurer DOUBLED AT, PAGE & COMPACT, Garden Qity, ^[ew Copyright, 1925, in the United States, 'Newfoundland, Great Britain, Canada, and other countries by Doubleday, Page & Company. AH rights reserved. TERMS: $4.00 a year; single copies 35 cents. '54