I went ahead, bit the bullet, and recalibrated opposite receive sideband suppression on the KX3. It was substantially off with both FL3 and FL2. With FL2 I was able to get a very good null. With FL3 the null was quite shallow, but better than before. Not sure if the FL3 situation indicates an issue with the roofing filter module, or if that’s just the way it is.
I’ll run the radio and watch everything for a while before redoing the PX3, since that’s band-by-band and more work than I have time for today. At least my 8640B still works :-)
Grant NQ5T
KX3 (8342)/KXPA100
>
> I’ve noticed (usually on 20M) that with the KX3 preamp OFF and a strong USB SSB signal tuned, that there is a LSB “shadow” on the left side of the cursor that shows up on the PX3 display, some dB down from the tuned signal. This does not appear if the KX3 preamp is turned ON.
>
> Would this be normal with the preamp turned off? Would it be reasonable to assume that either or both of the KX3/PX3 need opposite sideband nulling adjustments revisited? And if so, should the KX3 be done before looking at the PX3?
>
> At this point it’s just a niggle. The KX3 and roofing filter were shipped together from Elecraft and calibration was done at the factory. Perhaps it’s drifted somewhat with time and just needs to be tweaked.
>
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