The option of OP1 or 2.2, etc in the filter selection is for receive only.
However you still have to make sure that the BFO is place correct for the TX
filter OP1 and the easiest way to do that is to set up with OP1 in FL1 on
receive as was finally selected and match the BFO to that with Spectrogram.
Otherwise the BFO can end up in totally the wrong place with adverse effects on
the SSB TX audio.
Unless this is a very recent KSB2, a good improvement to the SSB audio could
be made by applying the KI6WX 2,2 or 2.5kHz modification to the KSB2. The
BFO again would need resetting to match the new filter parameters. Believe
Elecraft have now adopted the KI6WX 2.2kHz mod as standard on present KSB2
kits.
An added benefit is that the filter passband ripple appears to be
substantially reduced. I did the 2.2kHz mod and find the final result at about
2.3kHz
bandwidth with very little passband ripple. All makes for a better sounding K2
on SSB TX.
Bob, G3VVT
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