[R-390] AGC action on oscillator frequencies, cures?

[David C. Hallam]

Get a copy of Electric Radio for October 2005 and look at the article by Ron
Deeter.  See if that does anything for you.

David
KC2JD

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Tim Shoppa
> Sent: Friday, September 15, 2006 3:42 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] AGC action on oscillator frequencies, cures?
>
>
> I usually use my 390A to listen to (surprise!) AM SW and BCB broadcasts.
>
> And when I do use it for CW, I usually turn off AGC (unless I am in fear
> of my eardrums being broken!).
>
> But sometimes I turn on the BFO and use it with AGC, and it's obvious
> that oscillator frequencies are shifting about (hundreds of Hz) under
> strong AGC action.
>
> The 17MHz oscillator (below 8Mc bands) seems to do the most shifting.
>
> This has been discussed here before, and the concensus seems to have
> been that AGC action on the mixer tubes causes varying loading on the
> oscillator, but have any cures/mods ever been propsed/discussed/shot
> down?
>
> Tim.
>
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>
>
>
>
>
>
>
>
>