Hi Igor,
> What makes me worry is that when RF gain is used (some people
> do use attenuator) to get to more linear band of the AGC
> operation, it supresses receiver sensitivity putting very
> weak signals out of scope of the decoder.
Of course one does not want to reduce sensitivity to weak signals. The
original motivation for all of the WSJT modes is to provide optimum
weak-signal performance for a variety of propagation modes (such as EME,
meteor scatter, etc.). In EME, every 0.1 dB is important. I know that
reducing the RF gain setting on my TS-2000 has not compromised my
sensitivity. Knowledgeable users will make suitable tests to be sure
this is true for their systems, as well.
What is NOT desirable is to allow one or more strong but fading signals
to cause your Rx system gain to fluctuate by large amounts during an Rx
period. Such effects will surely reduce your sensitivity to weaker JT9
or JT65 signals.
-- 73, Joe, K1JT
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