Randy,

Thanks for your response. The obvious thing you would like to do is to have
the software be smart enough to distinguish between signal and noise. But
then the hardware becomes moot, and you have invented a better DSP noise
reduction circuit.

BTW, I am considering getting an ANC4 to get rid of power line noise on 6
meters. Fortunately, the noise is coming from the North, a very seldom used
beam heading.

Tam/WB2TT