PHE first United States radio beacon has just passed its. fina] tests. I[t has a-radius of 400 miles and enables airmen‘to keep their course durifg fog. 0 not expect an audio transformer secondary to make a good audio choke for :powerful.output work, as it is fundamentally. unsuited for such a prpose.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291018.2.61
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Radio Record, Volume III, Issue 14, 18 October 1929, Page 27
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51Untitled Radio Record, Volume III, Issue 14, 18 October 1929, Page 27
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