Fw: [R-390] cyclic reception, 0-8MC, non A

Thu, 13 Feb 2003 20:26:21 -0800

By the way, avoid running the receiver in that condition.  As I (further)
recall, the output from the regulated power supply voltage oscillated
somewhere between 180 volts (correct) and full output (above 400 volts - not
good).    The 'voltage pin' mentioned below is a test plug.  Caution - the
test plug is connected directly to the regulated B+ voltage output of the
power supply.  You can find at least 180 volts, and may find more than 400
volts at the test point if the regulator circuitry is not operating
correctly.  Note there are also voltage and hum adjustment pots located
below the test point.

I found several off-value resistors in the power supply module in the
receiver I have.  You might consider checking the regulator out thoroughly
before placing the receiver in service.

73 de Bill, AB6MT
[email protected]

>
> ----- Original Message -----
> From: "Bill Smith" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, February 13, 2003 8:14 PM
> Subject: Re: [R-390] cyclic reception, 0-8MC, non A
>
>
> > Check the power supply.  There is a voltage pin on the left-hand side of
> the
> > chassis.  I seem to recall I had that problem, which was traced to a
very
> > weak 6082.
> >
> > 73 de Bill, AB6MT
> > [email protected]
> >
> > ----- Original Message -----
> > From: <[email protected]>
> > To: <[email protected]>
> > Sent: Thursday, February 13, 2003 8:06 PM
> > Subject: [R-390] cyclic reception, 0-8MC, non A
> >
> >
> > > Good evening:
> > >
> > > Interesting behavior from my 'new' non A.  When listening to it
tonight,
> > on
> > > 0-7MC,
> > > the reception would abruptly go in and out on approx  5 sec cycle. On
> for
> > 5,
> > > off for 5 sec. Dropped out completely when off. The cycling varied a
> bit,
> > not
> > > absolutely regular, but fairly close. Was fine on 8 meg and above. I
> > replaced
> > > both V203, 1st mixer, used only on 0-8MC, and V401, the first crystal
> > > oscillator, which operates only on 0-8MC.
> > >
> > > I varied the line voltage, didn't seem to effect cycle speed. No
control
> > > settings seemed to make any difference. When it was 'on', the
reception
> > > seemed just fine.
> > >
> > > It seems unlikely that some thermally induced problem could be so
> regular.
> > >
> > > I would certainely be interested in any ideas that might steer me in
the
> > > right direction.
> > >
> > > Cheers
> > >
> > > Randy Stout
> > >
> > >
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