Amateur radio - how and why of wireless with complete instructions on operation of receiving outfits (1922) (14777957203)

Identifier: amateurradiohoww00grai (find matches)

Title: Amateur radio : how and why of wireless with complete instructions on operation of receiving outfits

Year: 1922 (1920s)

Authors: Grainger, Maurice J

Subjects: Radio Amateur radio stations

Publisher: New York : James A. McCann

Contributing Library: University of Connecticut Libraries

Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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mes from a long distance,caused by a distant storm). This will notovercome local static, however. CHAPTER XIV THE ARMSTRONG FEED-BACK CIRCUIT Regenerative Circuit Most Revolutionary Contribution toWireless Art—The Discovery One of the Ro-mances of Radio—How it Made Mod-ern Broadcasting Possible THE most important contribution to radioart since the perfection of the vacuum tube isthe much-discussed Armstrong Feed-BackCircuit. But for Armstrongs circuit therewould be no such thing as radiophone trans-mitting by means of vacuum tubes. In otherwords, but for Armstrong you could not getthe wonderful musical programs and otherforms of entertainment that are now dailybroadcasted by hundreds of stations through-out the United States. Certainly an arc transmitter could be used, but the sounds that would be projected through the air by this means would be so inextricably mixed up with clicks, hisses, gurgles and howls that nobody would have the patience to listen to it. No trans-Atlantic 87

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AMATEUR RADIO 89 conversation can be carried on without theArmstrong principle being employed; eventhe modern multiplex form of wireless teleg-raphy and telephony must pay tribute to Arm-strong. Edwin H. Armstrong is a young American.The story of his discovery is one of the greatstories of radio. He became interested inwireless when a boy in short pants. When hefirst hit upon his idea he could not for along time get anybody interested in his work.How could he discover anything? He wastoo young! Finally Professor Michael I.Pupin, Director of the Marcellus Hartley Re-search Laboratory of Columbia University,with whom he was at the time studying,placed at his disposal the facilities of theHartley laboratory in which to perfect his in-vention. This is Prof. Pupins tribute toArmstrong: The Armstrong Feed-Back Circuit is oneof the most important, if not the most impor-tant, invention in the wireless art. It is theinvention of employing in connection with anaudion a coupling which enables a

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1922

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