> That's where I'd start. Is there a ground loop through the
> AC supply, for instance? I've seen this sort of thing
> happen when you get a current on the outside of the coax,
> and the effects show up more at high power - I suppose
> because the magnitude is greater. Another possibility is
> some harmonic output from the amp. But I've seen from
> funny things with ground loops that misbehaved at high
> power, but not at low.
I doubt that. By ground loops I meant ground loops on the
SWR detector board causing the reading to vary with
frequency.
External loops that affect the meters unequally with power
would never occur.
73 Tom
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