[R-390] VFO End points

[Barry]

If his is only off 3kc on each end, once that's brought closer, the entire range may track without the need to adjust the corrector.

See http://www.r-390.com/cosmos.htm for more info on that process with a Cosmos PTO (if that's still needed).  If yours is from a different manufacturer, then the process can be different.

Regards,
Barry - N4BUQ

----- Original Message -----
> From: "Bob Camp" <ham at kb8tq.com>
> To: "Gordon" <gordon at n6wk.com>
> Cc: "R-390 at mailman.qth.net Group" <r-390 at mailman.qth.net>
> Sent: Friday, May 24, 2013 3:07:16 PM
> Subject: Re: [R-390] VFO End points
> 
> Hi
> 
> If you want to get it dead on over the entire range you need to
> adjust the track inside the VFO can. It's a bit tedious. Almost
> twenty years after the last R-390 shipped from Motorola, the
> assembly girls remembered that particular process. Their comments on
> doing it are not anything I can relay in a PG rated forum…
> 
> Bob
> 
> On May 24, 2013, at 1:20 PM, Gordon <gordon at n6wk.com> wrote:
> 
> > Barry,
> >  It goes more then 1,000 kc. It just isn't accurate at the ends.
> >  The high end zeros at 3 past  and the low Zeros at 3 before which
> >  is a total of 6 off.
> > I'll try the End Point adjustment, but I am afraid if I lower the
> > upper point by 3 to zero beat on 1,000 then the low end is going
> > to zero on -994.
> > Maybe I'm wrong.
> > Will see.
> > 
> > Thanks,
> > Gordon
> > N6WK
> > 
> > 
> > On 5/24/2013 10:00 AM, Barry wrote:
> >> If I'm not mistaken, the single endpoint adjustment affects the
> >> overall range the PTO covers in 10 turns.  Yours is not quite
> >> changing a full 1,000kc.  If you change the endpoint setting, it
> >> should affect both ends.
> >> 
> >> I think you're within specs but you can probably get it closer if
> >> you want.
> >> 
> >> Someone please chime in here if I'm incorrect.
> >> 
> >> Regards,
> >> Barry - N4BUQ
> >> 
> >> ----- Original Message -----
> >>> From: "Gordon" <gordon at n6wk.com>
> >>> To: R-390 at mailman.qth.net
> >>> Sent: Friday, May 24, 2013 11:28:37 AM
> >>> Subject: [R-390] VFO End points
> >>> 
> >>> I noticed today that my 390A zero beats at +003  and at -997
> >>> so it is 3 high on one end and 3 low one the other. It is pretty
> >>> close
> >>> to dead on at the 500 Mark.
> >>> Will the single End point adjustment at +000 fix this or make the
> >>> low
> >>> end worse?
> >>> 
> >>> Thanks,
> >>> Gordon
> >>> 
> >>> 
> >>> 
> >>> ______________________________________________________________
> >>> 
> > 
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> > 
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> 
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>