[R-390] Another R-390A question

[David C. Hallam]

Dave,

Remove the jumper from pins 1 & 2 on TB102.  Connect your ohm meter between
pin 2 and ground.  As you turn the RF gain control, you should read from 0
to 5K ohm.  I would suspect you have either a short in the pot or a short
someplace in the circuit.

David
KC2JD

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Dave Maples
> Sent: Wednesday, September 13, 2006 7:02 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] Another R-390A question
>
>
> Gents: All this discussion has prompted me to wonder about the performance
> of my R-390A.  It's probably stupid question time, but after watching the
> responses I'm willing to throw another one in the pot.
>
> I have never had the courage to pull the RF deck out (the gears
> don't bind,
> everything is free, all the coils have tuned, etc.).  I have completely
> recapped the IF and AF / PS sections.
>
> Here's my question:  When I rotate the RF gain counterclockwise
> on my 390A,
> there is minimal effect on overall sensitivity (some reduction,
> but signals
> are still clearly audible).  Recently I worked on another R-390A
> for another
> fellow, and lo and behold when the RF gain control was turned CCW the
> receiver would quiet right down to nothing.  I've only had the two to look
> at (never owned or used another one).  Which kind of behavior (some
> reduction or lots of reduction) should I expect?
>
> Thanks,
> Dave WB4FUR
>
>
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