[R-390] AGC Problems

Fri, 31 Jan 2003 22:17:10 -0500

What kind of meter are you using to measure it?  If it's a low impedance
volt meter, it may ne loading down the AGC line and giving an false low
reading.

----- Original Message -----
From: "Jim Brannigan" <[email protected]>
To: "Sam Letzring" <[email protected]>; <[email protected]>
Sent: Friday, January 31, 2003 9:20 PM
Subject: Re: [R-390] AGC Problems

> I don't recall the correct AGC voltages, but -1VDC seems low.  Did you
align
> the IF, including the AGC amp?
>
> Jim
>
>
> > I have a nice Stewart Warner 390A with a Collins IF  module.
> >
> > I can't seem to get the AGC voltage I think I should get.
> >
> > WIth 30- 40 uv RF in at 1.5 MHz I get plenty of IF output and > -10
volts
> output on the Diode load- but < -1 volt on the AGC line.
> >
> > What should the AGC voltage be? I have seen values quoted upt to -10
> volts?
> >
> > Any ideas on what I should check? Have checked tubes and caps in the
area
> of the AGC amps, detectors etc.
> >
> > Any clues will be greatly appreciated.
> >
> > Thanks
> >
> > Sam
>
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