F your set howls and whistles when ~ no one is near it you can be sure that the interference is coming not , from it but from one of your neighbour’s sets, HD idea of the double winding in binocular coils is to make the coil magnetically compact and comparatively incapable of f setting up unwanted coupling,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300207.2.83
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Radio Record, Volume III, Issue 30, 7 February 1930, Page 38
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56Untitled Radio Record, Volume III, Issue 30, 7 February 1930, Page 38
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