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NF Trimming.

I'd suggest listening to the output on a WBFM receiver 
and tweaking the preamp for best quieting while listening
to your weak noise source.  The threshold is reasonably
sharp.  Widening the receiver bandwidth to several MHz
would make the threshold effect even sharper.  You could
put a battery powered source inside a small metal tube
to make an adjustable weak signal source--if the tube is
small enough to act as a waveguide below cutoff.
73--Zack W1VT
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