Fw: [R-390] Receiver Overload?

Bill Smith [email protected]
Fri, 8 Mar 2002 13:48:03 -0800


----- Original Message -----
From: "Bill Smith" <[email protected]>
To: "Roy Morgan" <[email protected]>
Sent: Friday, March 08, 2002 1:44 PM
Subject: Re: [R-390] Receiver Overload?


Roy,

The AVC voltage at the RF trimmer cap shaft is exactly the same as pin 4 on
the back panel.  (Listening to a local AM station, AVC voltage was -7.5
volts in both cases.)   Carrier meter reading is 90.

By the way, I think a question arose regarding antenna connections.  I am
presently feeding the antenna into the balanced input through a small
home-made torroid balun.  I tried the unbalanced input, but aside from a
slight signal loss, the signal (and noise) is the same.  Intermod improves
if I only hook up one of the two wires from the balun to the balanced input,
but then that can be explained by the attenuation of the input.

Bill

> ----- Original Message -----
> From: "Roy Morgan" <[email protected]>
> To: "Bill Smith" <[email protected]>
> Sent: Friday, March 08, 2002 1:21 PM
> Subject: Re: [R-390] Receiver Overload?
>
>
> > At 01:06 PM 3/8/02 -0800, you wrote:
> > ...I inspected the fibre shaft, but it didn't look contaminated,
> > >and the section where it fits through the chassis was clean.  The
> insulating
> > >washer against the chassis looked ok also.
> >
> >
> > Bill,
> >
> > Did you measure the AGC voltage at the RF trimmer cap shaft?
> > It should be reasonable compared to the AGC line voltage.  If it's low,
> > then your AGC line is "leaking".
> >
> > Roy
> >
> >
> > - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> > 7130 Panorama Drive, Derwood MD 20855
> > Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
> > [email protected] --
> >
>