Hi Bruce. I'm listening to 15M CW right now and the band is full of CQ TEST. SKCC contest, I think. So, AFAIK, my mid-band QMX is working just fine. I've had QSOs on every band where my antenna is resonant...
John's assessment is probably spot on. But a little noise on the ADC I/Q diagnostic doesn't seem to have impaired my QMX, for whatever reason.
.rr
va3rr