Re: Low output from 2nd crystal filter and SA602 product detector
Posted by n7zf on Feb 01, 2011; 7:09pm
URL: http://elecraft.85.s1.nabble.com/Low-output-from-2nd-crystal-filter-and-SA602-product-detector-tp5979986p5982289.html
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.
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
URL: http://elecraft.85.s1.nabble.com/Low-output-from-2nd-crystal-filter-and-SA602-product-detector-tp5979986p5982289.html
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.
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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