[Elecraft] {KX3] KX3/PX3 Opposite Sideband Nulling -- Question

[Grant Youngman]

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.

Thanks .,,.

Grant NQ5T
KX3 (8342)/KXPA100