[time-nuts] Another "atomic" clock question

Bob Camp lists at rtty.us
Sun Mar 2 15:45:49 EST 2014


The gotcha is that there are second order temperature effects. If you are going to run the crystal very far off turn, you need to keep it more stable than you might think.


On Mar 2, 2014, at 3:40 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 3/2/14 12:21 PM, Bob Camp wrote:
>> Hi
>> As long as your resistor keeps the temperature to within a micro degree it will do pretty well.
> Oh, you were looking for 1E-12.. I was thinking 1E-9 would be good enough.
> The other issue is that the phase noise might be pretty bad with a cheap crystal, if it's not particularly high Q.   Probably not what you want to use if you're multiplying it up for the carrier on your 240GHz narrowband transmitter.
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