Technical Tips
JK EEP your switch contacts clean, for crackles, seratching noises and poor reception are all liable to be caused by dirty switches. NEVER attempt to run a lead-in wire (even although it is insulated) through a metal grille, as sometimes fitted over a doorway for ventilation, because if you do this a large proportion of the incoming signal strength may leak away through the insulation to earth. ‘
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320115.2.43
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Radio Record, Volume V, Issue 27, 15 January 1932, Page 15
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69Technical Tips Radio Record, Volume V, Issue 27, 15 January 1932, Page 15
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