[time-nuts] Another "atomic" clock question

Jim Lux jimlux at earthlink.net
Sun Mar 2 15:38:49 EST 2014

On 3/2/14 11:09 AM, Chris Albertson wrote:
>> Junk crystals are good thermometers.  Ballpark is 1 ppm/degree-C
> So does this mean I can epoxy a sandstone power resister to a junk
> crystal and keep the frequency exactly perfect by varying the power in
> the resister?

Yes.. but you have to hold temperature to 0.001 degree, which is 
somewhat challenging<grin>

A lot of SAW devices have tempcos that look like a parabola that fits in 
a box that is 100 degrees wide, and 100 ppm high.

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