Dave,
Sounds like a leaky power supply capacitor. Might be a cold solder
joint in the capacitor chain.
Good luck
Don
N8DE
Quoting K1TTT <K1TTT@ARRL.NET>:
> I have a commander hf-2500 (pair of 3cx800a7's, no qsk) that seems to be
> working fine. However, during cqww cw last week I had to pull it off the
> 20m station because it was making a broadband noise while on receive. I put
> it back on the station today and it isn't doing it now. I tried warming it
> up a bit and it still didn't do it....though its obviously not as warmed
> through as after 40 or so hours of cqww. The only other thing I noticed is
> when it was doing it the plate voltage dropped a bit, maybe 50-100v, but I'm
> not sure if that was a cause or effect since the line voltage sag from the
> other stations can make the hv sag a bit here. Any ideas where to start
> looking??
>
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>
>
>
>
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>
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