[R-390] Cosmos Drift

[Cecil Acuff]

Still got a 3TF7 in it....or another solution such Kielbasa.

Could be power line fluctuations, room temp changes.  You are not running 
the ovens are you....shouldn't be...

Might be the tube but I've heard of more problems with new tubes in PTO's 
than well seasoned ones...

Cecil...
----- Original Message ----- 
From: "Jon" <jonklinkhamer at comcast.net>
To: "R-390 at Mailman. Qth. Net" <r-390 at mailman.qth.net>
Sent: Wednesday, August 30, 2006 4:03 PM
Subject: [R-390] Cosmos Drift


> Hello to the group, hope everyone is having a great summer.
>
> If I had to write about my summer vacation at 44, I would tell the class 
> how
> I performed major surgery on a Cosmos PTO. How every night I turned 40
> screws,that are the size of an ant with a homebrewed tool, which sometimes
> caused havoc in restricting the turning of the shaft to messing up the end
> points, to interaction between other cal points, how I must of taken apart
> that $#%#$ thing 14 billon times. It is truly amazing that it is still
> working. Sorry, I had to get that out of my system. Now I was curious on
> what I will call long term drift. After installation of the PTO into the
> radio with it connected to a freq counter, I let it warm up for 48 hours
> before I cal'd it. After which, I brought it back to the set point in this
> case, 3.455000Mhz and let it sit. It is now over 3 days and the PTO has
> drifted over 1000Hz increasing in frequency. It seems to me that it will 
> not
> settle out like I thought it would. I was wondering if anyone else has
> experienced this or knows any 'quick' remedies. I would appreciate any
> comments at all. Thanks for the bandwidth!
>
> 73,Jon
>
>
>
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