Mike,
Although I have never measured my KX1, I suspect your measurements are
correct. I usually set my filter setting around 1.5 to 2 KHZ and
use this setting to tune around, for most QSO's, and for all zero beating. If
the going gets tough in a QSO I then turn on the RIT, use a sharper
setting and use a lower pitch. If a person prefers to use a sharper filter
setting for most operation, possibly a lower offset would be preferable,
however the somewhat marginal opposite sideband rejection would probably be
degraded further.
I am considering adding an active audio filter possibly with a broad
enough response curve to let both 400 and 600 Hz through. Also under
consideration is a lowpass audio filter. In the past I have build single pole
active filters which have improved the audio selectivity without
any apparent detrimental effects to the audio quality. Hopefully I could
squeeze in inside the AGC loop, however it might need to be external.
Rick KL7CW KX1 # 798 Palmer, Alaska
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