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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Clark Savage Turner, J.D., Ph.D.
Professor of Computer Science
Cal Poly State University
San Luis Obispo, CA. 93407
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