[R-390] VFO End points

[Bob Camp]

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
>>> 
>>> 
>>> 
>>> ______________________________________________________________
>>> 
> 
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