[time-nuts] OXCO Issues -- Pictures

Frederick Bray fwbray at mminternet.com
Sun May 12 14:31:31 EDT 2013

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.


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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