[time-nuts] 10811 Repair - Voltage Check

[Dr Bruce Griffiths]

Jason Rabel wrote:
> Thanks for all the tips guys... I'll let you know how it goes later today.
> Right now I'm assembling my Brooks Shera GPS in its box so I can get that
> going on a more permanent basis. I get some pics online when I'm done.
>
> Bruce mentioned to me to try with some alligator clips first to see if that
> resolves the issue.
>
> Here's a bit I sent to him off list which is kind of odd to me:
>
> --------
>
> I hooked the oscillator up cold (still out of its shell) to my frequency
> counter, and after a lot of fidgeting I was able to get it to count the weak
> signal, and it was up there near 10 MHz.
>
> I re-assembled everything just curious if I could get it on frequency with
> the oven on and warmed up. After letting it warm up I hooked it up but the
> signal was gone. Only thing I could get was what looked like some AC ripple
> garbage. Here's the odd part...
>
> I let it cool down for a while, and when I came back I hooked it up to my
> scope before powering it on. The signal came on (way low but clean), then it
> grew to what should be the correct levels, then started shrinking and
> shrinking until nothing agagin. All this happened within 10-15 seconds or so
> I would guess. I unplugged it and let it sit for a few minutes and tried
> again, this time the signal came on (weak again) and then just slowly faded
> out to nothing (garbage / noise).
>
> ----------
>
> If the leads going to the crystal don't fix it, I'll probably end up having
> it sit in a drawer for spare parts or something. Unless someone here thinks
> they could repair it or even diagnose it better? 
>
>
> Jason
>
>
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>   
Jason

If the crystal is non functional you could always open the can, extract 
the blank and attempt to sell it on eBay like the person who recently 
disassembled an Oscilloquartz BVA resonator  and then listed it as 
working despite the scratches on the crystal.

Bruce