Ummm ..don't have a good answer for your specific question. The last time I
did it, I used an XG3 and calibrated each filter on each band (there are
actually per-band phase/gain settings for each filter).
If you used an XG1 did you calibrate on the 40M fundamental, or was there
enough 2nd harmonic to calibrate on 20M? I found considerable differences in
per-band gain/phase settings. So it wouldn’t be surprising if the null depth
is not quite as good on a band you had not specifically calibrated for. And in
some cases you could still barely hear the alternate sideband — but it was very
weak in any case.
I also found that the automatic null routines didn’t always get to the deepest
null. Elecraft says that it’s (60+ dB) good enough, and it likely is from any
practical view point. But it was possible in some cases to improve the null
slightly by a +/- 1 count manual adjustment of either the phase or gain setting
after running the auto-null routine. It varied by band and filter, and manual
tweaking didn’t always result in any improvement.
Grant NQ5T
> On Dec 26, 2020, at 10:44 AM, Steve Zabarnick wrote:
>
> I recently noticed that I could hear the opposite sideband on my KX3. As a
> result I tried using my XG1 to do the sideband cancellation calibration
> described in the KXFL3 manual. During the calibration I could significantly
> reduce the sideband so that it could no longer be heard by ear. But, once I
> left calibration mode, I could still hear the opposite sideband from the
> XG1. I did restart the KX3 to save these settings and confirmed that the
> phase and amplitude settings were saved per filter. Any suggestions?
>
> Steve N9SZ
> __
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