Short-Wave Oscillation
Eliminating Treshold hor "THRESHOLD oscillation is that peculiar how] which is sometimes experienced on short-wave sets, and which is somewhat similar in sound to a "grid-leak" howl. It occurs just about at the point where the set should commence to oscillate in the normal manner, but as soon as the reaction control is tuned to make the set oscillate more strongly, the threshold howl ceases. There are two points which will invariably be found to help matters if not to completely cure the trouble. The first is to use a higher value grid-leak than the usual 2 megohms, one even as high as 5 megohms sometimes being desirable. . Secondly, the effect of re ducing the B voltage on the valve should be. tried. i
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291004.2.84
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Radio Record, Volume III, Issue 12, 4 October 1929, Page 32
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126Short-Wave Oscillation Radio Record, Volume III, Issue 12, 4 October 1929, Page 32
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