Rich Measures wrote:
>
> >
> >Philip Balister wrote:
> >>
> >> I have a SB-200 amplifier. Recently I noticed the SWR seen by my
> >> rig feeding it has increased on 10m. I checked across several bands
> >> and found high SWR (>3:1) on 10 and 15 meters. 20 and 80 look fine.
> >> Other than that everything seems OK.
> >
> >Your antenna or feedline has a problem.
>
> ? I don't see how an antenna could affect swr to the tuned input
> circuits of the amplifier, Vic. .
I misread his message- I thought he was talking about the *output* swr. Sorry.
I guess either the input circuit has been misadjusted or damaged. Maybe the
tubes are weak, as he suggests, and the change in operating conditions is
reflected in the input impedance?
Vic
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