I now have pictures of the innards of the OXCO. Unfortunately, the FTP
site that I would normally upload them to isn't functioning today.
I will be happy to e-mail them directly to anyone who wants to see
them. I don't want to burden the list.
Fred
On 5/12/2013 10:59 AM, Ed Palmer wrote:
When you've got it powered up again, you should try adjusting the
trimpot. You should be able to find a spot that gives you a frequency
minimum, assuming this is an AT crystal. This will minimize
sensitivity to temperature change. There's a slim chance that a shift
in the temperature set point could be at the core of your problem, but
it would be a rather extreme case.
Ed
On 5/12/2013 9:36 AM, Frederick Bray wrote:
Well, I decided to make the "Y" incision and pulled the circuit board
out of the oven. (Photos later after I crop them.)
Yes, the trimpot is part of the circuit associated with the thermistor.
My plan is to check the resistors (surprisingly most are carbon film
except those in the thermistor circuit), look at the circuit board
under a magnifier, and stick it back in the foam for testing after
making any repairs.
Thanks again for the continuing comments and advice.
Fred
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