Many years ago I designed and built this circuit for 10m WSPR. It was later adapted for 10m FT8. It works really well.
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
Later this week BBC Long Wave on 198kHz goes QRT for the last time. We went by the Droitwich TX yesterday on the train. Sad, but inevitable ...
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