Hi All,
I have a rev 3a QDX (80-20 model, firmware 1.10) that I built back around 10/2022. I used it more or less continuously for 6mo after building it, with great results. I wrapped T1 for 12v and usually ran it from my bench supply at 13.8-14.4v. I never had issues with heat - my shack is in the basement and is rarely over 60-65F, but perhaps this is the root of my problem?
In any case, I set it up again this morning and while going through the bands I discovered that 80M doesn't transmit at all. The LED pulses, but the meter on my ATU registers no output power. The rest of the bands seem fine - 5.5w on 20M, 7.3w on 30M, 5.9w on 40M, and 7.6w on 60M, tested using the built in transmitter tester. I see the same results using the tune button in WSJT-X.??
I shot a quick video here:
And have photos of the board here (I don't see anything wrong, but perhaps someone else will) -?
Any recommendations for things to check or test? I have a pretty standard complement of radio/lab gear to work with.
Thanks & 73s,
John K1QLN
