Hi If the oven is cycling enough to swing the frequency > 1 ppm, doing a turn hunt is going to be pretty tough. You are looking for small fractions of a ppm as you tweak the trimmer. The other minor point is that you need to do it with the foam and cover on the oscillator. Drilling a hole in the can is not all that hard.
Bob On May 12, 2013, at 1:59 PM, Ed Palmer <[email protected]> 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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
