[hpsdr] Pennywhistle bias setting

Gerald J. Herman gherman at wwnet.net
Sat Dec 26 08:41:01 PST 2009


Finished Pennywhistle assembly and going through Adjustments. The quiescent current is to be set at 450 mA per transistor which seems rather high to me. This amounts to approximately 12 watts of power in the quiescent state. I suspect the effect of lower currents and their effects on harmonics was investigated by someone who has the appropriate equipment. Since filtering is required after the amplifier anyway to make it legal, would it be possible to run lower currents and reduce the quiescent heating and power draw, and still be legal?

Wonderful kit and a joy to assemble. Thanks to everyone involved.

73,

Gerry
KR8W
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