Useful Hints
Poor contacts in a resistance or an imperfect primary or secondary winding or bad aerial insulation are * common causes of "interference." AUtHOoUGH a small hole or two in a screening-box is comparatively harmless, an imperfectly fitting lid or bad joint along one edge of the box destroys much of its efficiency,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320122.2.41
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Radio Record, Volume V, Issue 28, 22 January 1932, Page 22
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53Useful Hints Radio Record, Volume V, Issue 28, 22 January 1932, Page 22
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