Anyone have any comments/experience on the QRP Plus (++) reference frequency adjustment procedure?
I have a QRP Plus V2 in top condition. When first powered on the displayed frequency is off by 0.2 KHz. As the radio warms up it does improve. That may be within spec for the radio, but if it can be improved, I'd like to try.
With newer radios correcting an offset is usually as simple as tuning a single inductor or capacitor, but I see with the QRP ++ the manual process is more involved. It requires connecting a counter or spectrum analyzer to pin 17 on LO PCB chip U4 and adjusting C47 and C48 looking for specific frequencies while tuning.?Without disassembling the stacked boards, it appears the capacitors are adjustable via holes in the board above but pin 17 on the IC looks difficult to access. Anyone who has tried this have comments?
Is there an alternative process where one could simply adjust the caps during TX and simply correct the carrier frequency to better match the displayed frequency?
