Thanks for the responses
?? As stated in OP, I'm using firmware 1-01.c - the three blinks should indicate that the QDX thinks it's transmitting. Also the current draw increases so something changes when it goes into transmit.
?? I did try a dummy load - no joy
? Evan - I'll try checking the diodes in the LPF. The thing that really got me is that receive is also dead, as in 0 db shown in WSJT-X. There are entirely different circuits selecting the BPF and LPF and both stopped working.
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? 73
??? KD8CGH
Bob Benedict, KD8CGH