How about from a zener diode in a bias supply.
They make dandy noise generators and were the source of widband rf for the
old Omega noise bridge. The current to make noise is critical, line voltage
upset could put it at that point?
Just fuel for thought.
Paul K0UYA
----- Original Message -----
From: <n8de@thepoint.net>
To: "K1TTT" <K1TTT@ARRL.NET>
Cc: "Amps" <amps@contesting.com>
Sent: Saturday, December 06, 2008 11:24 AM
Subject: Re: [Amps] rx noise?
> 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
>>
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
>
>
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