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Published by Experimenter Publishing Company, Inc Radio News for May, 1929 ' Volume 10 May, 1929 Number 11 ARTHUR H. LYNCH, Editor -in -Chief C. P. MASON, Associate Editor JOHN B. BRENNAN, Jr., Laboratory Director C. WALTER PALMER, Director Information Service Contents of This Issue Aviation and Radio The Hammarlund- Roberts "Junior Hi -Q By Arthur H. Lynch 985 ' 29" By Leslie G. Biles 1009 Giant Speaker of Four -Mile Range By -Pass Resistors for Series-Filament By C. Sterling Gleason 986 'Operation By J. H. Arnold 1011 Public- Address Systems By J. E. Smith 988 The "A.C. Screen -Grid DX-er" What's New in Radio 992 By Robert Ilertzbcrg 1012 Radio "Mysteries" and Other Audio More About Harmonics of Long -Wave Effects 994 Broadcast Stations 1015 Increasing Selectivity in a Receiver Wavemeter Hints for the Short -Wave By C. Walter Palmer 995 Listener By A. Binneweg, Jr. 1016 How to Deal with "Man -Made Static" The Service Man 1018 By Tobe Deutschmann 998 Radio Wrinkles 1020 Choosing Between Volume -Control Meth- The Constructor's Own Page 1022 van ods By Ashur A. Sommers 1000 List of Broadcast Station Calls 1024 How to Build the New York Times On the Short Waves 1026 Short --Wave Receiver By F. E. Meinholtz 1002 RADIO NEWS Laboratories 1028 The Radio Beginner -A "Hartley" R.F. I Want to Know By C. W. Palmer 1029 Broadcast Receiver By B. B. Bryant 1006 4p Radio Book Review By H. M. Bayer 1052 IN THE FORTHCOMING ISSUES For our June and following issues RADIO NEWS has In preparation. among others, the following articles of interest to our constructors: A NEW BROWNING CIRCT:IT. Professor Glenn H. Brown- A NEW TYPE OF SUPERHETERODYNE. This receiver. ing. co- inventor of the famous Browning- Drake. has de- the last achievement of the late R. E. Lacault, inventor of veloped new receiver employing the new U57-224 A.C. the Ultradyne. will appear in the near future, and be screen -grid tubes. On trial of this set in Boston, nine found of special interest. Pacific Coast stations were received on the loud speaker. It A MODERN SINGLE- CONTROL SCREEN -GRID RE- is designed to work with the new Millen "Velvetone" ampli- CEIVER. John B. Brennan, Jr.. formerly Technical Editor fier. A series of exclusive articles, covering the mathe- of "Radio Broadcast." will describe another very interesting matics, design and construction of this remarkable set will receiver especially adapted to present -day requirements In appear in the next few issues. home entertainers. THE " ELVETONE" 245 -TYPE AMPLIFIER, the first to SHORT -WAVE TRANSMITTERS. At the request of many use the new UY -245 A.C. 254 -colt power tube. designed by readers. RADIO NEWS will resume publishing articles on James Millen, will appear in June. It cives remarkable this subject, beginning with a low - powered (201A) outfit volume and quality with a 245 push -pull stage, and furnishes to give the amateur modest start at low cost. -B for a receiver. also "A -C" power AVIATION RADIO EQUIPMENT. The remarkable recent THE "EVERYMAN A.C. SCREEN -GRID FIVE," by Zell developments of apparatus of this type will be exploited Bowls, will be so described that it may be readily con - in the next few issues of RADIO NEWS; the Improved structed either as complete receiver or ss a tuning unit Radio Beacon. one of the most important adjuncts of com- to operate a separate power amplifier. mercial dying. will be described in the June kaue. RADIONEWS is published on the 10th of each preceding month. There are 12 obtained from the publishers. Copyrighted in Germany. Reproduction of articles numbers per year. Subscription price 1e 22.50 year In U. S. and po.sestlan,. In Germany is reserved for Radio, Berlin 42. Canada and foreign countries, 13.00 per year. U. S. Coln as well fie U. 8. Stamps RADIO NEWS is for sale at all newsstands in the United States and Canada, accepted (no foreign colon or Stamps). Single copies, 25 rent. each. Cheek. and and at Brentano'., Ave. de L'Opera, Paris, Fonce. European agents: S. J. Wise money orders should be drawn to order of EXPERIMENTER PUBLISULNO Et Cie. 40 Place Verte. Antwerp, Belgium. CO., INC. HOW TO SUBSCRIBE FOR RADIO NEWS. Rend your name, address and re- All communication. and contributions to this lournai should be addressed to mittance to Experimenter Publishing Co., 230 Fifth Ave., New York. Mention the Editor. RADIO NEWS. 230 Fifth Ave.. New York. N. Y. Unaccepted contribu- name of the magazine you re ordering. We also publish SCIENCE AND INVEN- tion. cannot be returned unless full postage has been included. All accepted con- TION, RADIO LISTENERS' GUIDE and AMAZING STORIES. Write clearly. tributions are paid for on publication. A special rate is paid for novel experi- RATES AND TERMS. The subscription rate for RADIO NEWS is 22.50 per Publishers are ments; good photographs accompanying them are highly desirable. year. 412 number.). When remitting do no by check. money order. or registered not responsible for loss of manuscripts, although every precaution is taken with letter if cash is enclosed. Avoid sending cash through the snail if possible. Sub- such manuscripts. upon receipt thereof. scriptions for less than one year are not accepted. Subscription may be made In RADIO NEWS. Monthly. Entered a second -class matter. July 12. 1024. at the combination with SCIENCE t INVENTION, RADIO LISTENERS' GUIDE, Post Office at New York. N. Y.. under the Act of March 3, 1879. Additional entry and AMAZING STORM &. at Dunellen. N. J. and San Francisco, Calif. Title registered U. S. Patent Office, POSTAGE. We prepay postage in all parte of the United State., Mexico and Copyright. 1829. by The Experimenter Publishing Co., Inc, 230 Bifth Ars.. island poeseesione. For foreign or Canadian subscriptions we require 50 tents in New York. The contents of this magazine ore copyrighted and must not be addition to the subscription price for additional postage charge. reproduced in the United State without giving full credit to the publication. CHANGE OF ADDRESS. Notify us as far in advance as possible. It requires Translation Into foreign languages must not be made unless permission le weeke to make an address change on our recorde. Alware write clearly. The contents of RADIO NEWS are indexed in the Industrial Arts Index, copies of which can be found in every library. Published by Experimenter Publishing Company, Inc. Member: Audit Bureau of Circulations Radio Magazine Publishers Association Advertising Representatives: RHODES & LEISENRING New York Offices: 624 Graybar Building Chicago Offices: 307 North Michigan Ave. Editorial. and General Offices 230 Fifth Avenue, New York City www.americanradiohistory.com.
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