[R-390] VFO End points

[Roger Ruszkowski]

Gordon,

Another fine story,
More fun than reading about warn fuzzy puppies.

Roger Ruszkowski


-----Original Message-----
From: Gordon <gordon at n6wk.com>
To: R-390 <R-390 at mailman.qth.net>
Sent: Mon, May 27, 2013 7:57 pm
Subject: Re: [R-390] VFO End points


Roger and all,
  I opened up the VFO, Nothing hissed out at me.. LOL
I removed 1 turn off coil and resoldered and re-assembled. I now have 
the end points within 100hz of each other. I'm Happy ! :-)  :-)
Thanks for all the advice !!

73,
Gordon

On 5/27/2013 4:47 PM, Roger Ruszkowski wrote:
> Roger,
> I did the End point adjustment and have it down to just under 1kc (900hz) off 
from end to end.
> I had to adjust the coil clockwise.
> I have run into where any more clockwise adjustment makes NO more change.
> I assume I must open the VFO and remove one turn from the coil ?
> I have the adjustment set to exactly Zero on the low end and the top comes
> out to 900 hz past the 10 turns mark . (+XX.000) and 900 hz. (Just under 
+XX.001)
> Perhaps I should leave it be since it is so close now. Still,
> I'd like to have it exact..LOL
>
> GordonN6WK
>
>
> Gordon,
>
> Nitrogen being most of the air we breath is no problem.
> You may want to bleed the 15 PSI off slowly.
>
> I have never done a cosmos VFO myself so I do not
> know if you really have to open the sealed chamber
> to get to the trim coil.
>
> How do they keep a seal on the VFO shaft into the
> pressure chamber?
>
> Ok Fellows, how best to trim up a Cosmos VFO?
>
> Roger AI4NI
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