[Elecraft] Low output from 2nd crystal filter and SA602 product detector

n7zf nsevenzf at yahoo.com
Tue Feb 1 14:09:25 EST 2011


Don,
AGC was on,  T7 is 5:20, crystals are the -S flavor.

With a -130 dBm signal, Spectrogram shows the signal about 20 dB above the
noise floor, so I guess I have nothing to worry about.  Can easily hear the
signal with headphones.  This graph is with AGC on, and the AGC off chart
looks about the same.  

http://elecraft.365791.n2.nabble.com/file/n5982289/minus_130_dBm_signal_at_10.1_MHz_with_agc_on.jpeg 

I will go back to the original problem I was chasing:  on transmitter tests,
the K2 draws about 50% more current than it should.  I am guessing that I
need to work on the transformers in the PA circuit.
Thanks,
Bob N7ZF
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