'Phone versus Key
American Contest AMERICAN amateurs have just concluded a unique contest arising out of a challenge issued by operators’ of *phone stations declaring that code men are wrong in assuming that radio-tele-phony is less useful and accurate than. radio-telegraphy,. Early on four consecutive Sunday mornings recently. ten stations on both coasts of the United States went "on the air," half using ’phone and half using code, with an official test message prepared by the American Radio Relay League, The results of the struggle are not yet to hand. ,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310327.2.64.5
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Radio Record, Volume IV, Issue 37, 27 March 1931, Page 29
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90'Phone versus Key Radio Record, Volume IV, Issue 37, 27 March 1931, Page 29
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