Hello Stefan,
Monday, November 14, 2016
I am not convinced it *IS* a mismatch issue, I have a sneaking feeling
the FET driver is failing first. But a FET failure can also take out
the driver, as well as vice versa I think. It could also be that now i
have a full, none drooping, regulated 100V DC to the PA it is a bit
too much for them. So I feel a bit in the dark about the failure mode
still.... If a lack of drive signal failed to trip the amp, that too may
be the cause? I must build an RF ammeter. At the moment I just have
a "Scopematch" in the co-ax near the amp, in the shack.
> Hi Chris,
> What causes the (sudden?) mismatch? Better to find and solve that
> problem than building a SWR meter i find. I'm not using any protection
> circuits for my PAs, just an Amperemeter is showing the antenna current.
> That is important, having no Amperemeter would be like driving a car
> without a tachometer :-)
> 73, Stefan
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