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I would use CW or FM to set power. as 3mV audio only applies to SSB and AM. And most electret microphones give far more than 3mV!

I can not remember if VHF and UHF share the same transistor, wuthout looking at the diagram.

The FET outlput transistors are very robust

KR

Andrew

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On 30 Apr 2025, at 05:49, "HF via " <yahoo.com@ target=_blank>incorridge=@> wrote:

Hi Andrew,

Yep, that's probably what it was!? With new ribbon cables, VHF adjusts as the instructions suggest and UHF doesn't adjust at all.? That seems to be a failed transistor - the adjustable bias voltage does arrive at Q401's gate.

By raising the TX Total Gain settings, I've increased the output power on all bands except UHF.? In CW mode, I now get 40-80 W depending on band.? That increased power output is much more stable over time than before.? I adjusted TX Total Gain for 40W (instead of 50W in the instructions) because the highest setting barely gave me 50W even while applying more than 3 mV rms audio.? Should I raise the audio level so high that the output power doesn't increase any more and set TX Total Gain again?? Which step in the TX chain is affected by these TX Total Gain settings?

Cheers,

Halden VE7UTS