Radio broadcast .. (1922-30)

RADIO BROADCAST ARTHUR H. LYNCH, Editor WILLIS K. WING, Associate Editor JOHN B. BRENNAN, Technical Editor NOVEMBER, 1925 Vol. VII, No. 1 BEHIND THE EDITORIAL Cover Design From a Painting by Fred J. Edgars England's Greatest Broadcasting Station Frontispiece They Shut the Door on Fortune C. S. Thompson The March of Radio J. H. Morecroft The Radio Broadcast "Aristocrat" Arthur H. Lynch The Listeners' Point of View Kingsley Welles A Model 1926 Broadcast Receiver McMurdo Silver "Radio Central" — Conqueror of Time and Distance Fred /. Turner As the Broadcaster Sees It Carl Dreher Improving the Cone Loud Speaker An Improved Five' Tube Receiver for the Inexperienced Constructor ' A. H. Fulton, Jr. What Do We Know Aboxit Short Waves? Keith Henney An A. C. Receiver and Power Amplifier James Millen When the Doctor Came to the Farallones — by Radio Lewis 7S[. Waite "Now, I Have Found ..." Measuring High Resistance — A New NP Coil for the Roberts Receiver — A Good Neutralising Condenser — Short Waves on the Hanscom SuperHeterodyne — Solving a Lead-in Problem— An Efficient Coil The Grid — Questions and Answers ''"'*' Some Facts About Static and Fading — Why Coils Work on One Frequency Better Than Another — How to Build a Loop — Substituting Toroid Coils in Neutrodynes The Best in Current Radio Periodicals E. D. Shalfyuser The Winner of Our $500 Prise Cover Contest How To Eliminate Local Interference * * * What Our Readers Write Us 72 88 100 102 110 A~\ TE ARE proud to present the new RADIO BROADCAST which "' in quality of appearance and contents speaks for itself, and we are confident that all our readers will feel the same as one enthusiastic subscriber who was in the office the other day and to whom we showed the plans of the new RADIO BROADCAST. "Why," said he, "there is nothing in the radio field to equal RADIO BROADCAST now that you have increased its size and succeeded in turning out a magazine of the splendid quality of this November number." In this issue are described four complete receivers, any or all of them good enough to please the heart of the most discriminating of constructors. The RADIO BROADCAST "Aristocrat" is a singlecontrol set with resistance coupling; Mr. Millen's receiver and power amplifier is the first one to be described employing important new developments with a.c. audio power amplifiers for the home constructor. The other articles are worthy of distinct attention each on its own merits. TV/f R C. S. THOMPSON, the author of the interesting piece •"•*• about Doctor Deforest, was for many years closely associated with him and knows whereof he speaks. Mr. Fred Turner, whose '"Radio Central' — Conqueror of Time and Distance" appears in this number, is a broadcast speaker whose "Trips and Adventures" are familiar to WEAF and wjz listeners. Readers who have been following the interesting discussion in Carl Dreher's department regarding the merits of so-called "super power" will read with great interest the concluding arguments in this word-battle. Those who have been curious about the internal human machinery of a great broadcasting station should read Mr. Dreher's leading article on page 45. In the following numbers of the magazine, there will be articles of great interest to every one who follows radio. To make a confession, because of lack of space for many months, the editors have had to leave out almost as much material as appeared in the magazine. That embarrassment of riches means that the reader can be confident of some mighty good mater al in every number. One of the" most interesting of the articles due to appear as soon as space can be made is by Roland F. Beers on "How to Build an Improved Plate Supply Unit" employing the new Raytheon tube, an improved "S" tube. The article is very complete constructionally and every part of the B supply unit is fully described. And Glenn H. Browning has developed an improved Browning-Drake receiver using impedance-coupled amplification which will be described soon. Write and tell us how you like RADIO BROADCAST with its new cover and in its new form. Doubleday, Page & Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN & HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL EL Eco THE FRONTIER Doubleday, Page &• Co. BOOK SHOPS /"LORD & TAYLOR BOOK SHOP ,., v ) PENNSYLVANIA TERMINAL (i Shops) DRK' \ 38 WALL ST. (.GRAND CENTRAL TERMINAL ( 223 NORTH 8™ STREET MARYLAND AVENUE UE TREET TOLEDO, LASALLE & KOCH CLEVELAND, HIGBEE Co. SPRINGFIELD, MASS., MEEKINS, PACKARD & WHEAT i T. LCUIS, K'.w. »« r.rv I 920 GRAND AVENUE KANSAS CITY, ( Jo6 WEST 4?TH STR Doubleday, Page Sr Co. OFFICES GARDEN CITY, N. Y. NEW YORK: 120 WEST }2ND 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. DOLBLEDAY, President A. W. PAGE, Vice-President NELSON DOUBLEDAY, Vicc-President RUSSELL DOUBLEDAY, Secretary S. A. EVERITT, Treasurer JOHN J. HESSIAN, Asst. Treasurer DOUBLEDAT, PAGE & COMPACT, Garden Qity, ^ei Copyright, 1925, in the United States, Newfoundland, Great Britain, Canada, and other countries by Doubleday, Page &• Company. All rights reserved. TERMS: $4.00 a year; single copies 35 cents. 14