Radio age (Jan-Dec 1925)

RADIO AGE for November, 1925 The Magazine of the Hour The Magazine of the Hour Established March, 1922 WITH WHICH IS COMBINED RADIO TOPICS Volume 4 November, 1925 Number 11 CONTENTS Cover Design by Anker P. Mehlum A Super Het without Intermediate Stages.. 7 By Roscoe Bundy Riding the Short Waves. 11 By Armstrong Perry Directing the Air Mail By Radio 13 By S. R. Winters A Windless, Pipeless Pipe Organ.... 15 By J. C. Jensen A New Low Loss Receiver 17 By H. Frank Hopkins Magnetic Theory of Radio Transmission 21 By Beecher I. Sheridan On Inductive Radio Interference 22 How to Make an Efficient Low-Wave Transmitter..23 By Brainard Foote RADIO AGE "What the Broadcasters are Doing" Studio-Land Feature Section 25-32 RADIO AGE BLUEPRINT Section— Adding Radio Frequency Stages 33-40 By John B. Rathbun Late Models at the Chicago Radio Show.. 42 Pickups and Hookups by our Readers.. 43 Corrected List of Broadcasting Stations ....66-68-70 Radio Age is published monthly by RADIO AGE, Inc. Member: Audit Bureau of Circulations. Publication Office, Mount Morris, 111. Address all communications to RADIO AGE, INC. Executive, Editorial and Advertising Offices 500 N. Dearborn Street, Chicago, 111. Frederick A. Smith, Editor Frank D. Pearne, Technical Editor M. B. Smith, Business Manager Advertising Director HARRY A. ACKERBURG 500 N. Dearborn St., Chicago, III. Eastern Representative DAVIDSON & HEVEY, 17 West 42nd St., New York City Pacific Coast Representative V. M. DEPUTY & ASSOCIATES, 515 F. W. Braun Los Angeles, Cal. Bldg., Final Advertising forms close on the 20th of the 2nd month preceding date of issue Vol. 4, No. 11. Issued monthly. Subscription price S2.50 a year. November, 1925. Entered as second-class matter at post office at Mount Morris. Illinois, under the Act of March 3. 1879. Corvriaht. lets, In RADIO AGS. Inc. A Chat With the Editor EDITORS, engineers and manufacturers have combined their efforts toward making "The Radio Age Model Receiver" a truly valuable aid to the home set-maker. The description of the circuit, with drawings, photographs and blueprints, will be published in the December issue. We are giving the circuit a name which clearly shows that back of this outfit is the indorsement of our engineers and editors. We do not claim this circuit is a departure from present approved lines of design and construction. We do not claim that it involves any radical improvements. We merely assert our confident belief that this December feature will be the best illustrated how-to-make article this magazine has ever published. All parts used in the construction of this set will be listed under their trade names. This, in itself, is a departure for Radio Age. Our policy heretofore has been to let the reader make his own selections of apparatus and accessories. In this feature article, however, we are going to try to make the instructions so complete that no reader will have to ask a single question further after he has read the directions. Realizing that in choosing good parts for a five-tube-tuned radio frequency receiver, such as this set, it will be impossible to include all the really good parts which would give satisfaction for a given purpose, it is our purpose to follow the original article with others, one each month, in which there will be changes in various details of the circuit and in which the list of parts again will contain trade names, probably quite a different list in a majority of its items from the December suggestions. Tuned radio frequency is popular now. We suggest that setmakers make sure of getting the December issue and follow the series carefully. Editor of RADIO AGE