Relay of P[?] Speech
ee eee N automatic volume control used by members of the American Amateur Radio Relay League successfully overcame fading during their relay of the Pope’s speech from the Vatican City station. The transmission, which was picked up on a specially-designed twovalve short-wave converter employed as a short-wave "superhet," was amplified in turn by a standard superheterodyne broadcast receiver, which fed through & eoupling device into the telephone lines linking all the stations of the Columbia chain.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310605.2.26
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Radio Record, Volume IV, Issue 47, 5 June 1931, Page 9
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79Relay of P[?] Speech Radio Record, Volume IV, Issue 47, 5 June 1931, Page 9
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