[TenTec] Omni VI lock problem

[Clark Savage Turner]

Interesting, Ken.  I heard my TCXO drift up and down, just a few Hz 
here and there.  Sorry if I didn't pay attention to your post, I just 
scanned it and recall the "hunting" behavior of the frequency stability 
circuits, so I quickly posted my recollection of the fix.

Clark
WA3JPG

On Sep 22, 2007, at 4:11 PM, Ken Brown wrote:

> Hi Clark,
>
> Thanks for the suggestion. I don't hear the 20 MHz TCXO drifting. It is
> rock solid. Maybe if it's output level drops this problem can occur
> while the frequency remains stable???
>
> DE N6KB
>
> Clark Savage Turner wrote:
>> Hi Ken -
>>
>> I had a similar problem.  Needed a new crystal oven.  I understand you
>> can buy the TCXO that is a fairly simple replacement, too.  Not
>> expensive.
>>
>> Clark
>> WA3JPG
>>
>> On Sep 22, 2007, at 3:55 PM, Ken Brown wrote:
>>
>>
>>> Hi all,
>>>
>>> My Omni VI has a cyclical drift problem. It sounds like a PLL 
>>> drifting
>>> away from lock and then being pulled back into lock over and over
>>> again.
>>> My first guess was that one of the crystals or other components on 
>>> the
>>> XTAL OSC. - L.O. MIXER BOARD had aged to the point where it was
>>> difficult to keep it locked.
>>>
>>
>>
>>
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>>
>>
>
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>
Clark Savage Turner, J.D., Ph.D.
Professor of Computer Science
Cal Poly State University
San Luis Obispo, CA. 93407