[time-nuts] Thunderbolt oscillator temperature sensitivity
Bob Camp
lists at cq.nu
Mon Dec 28 18:03:05 UTC 2009
Hi
The oscillator tempco shown on the screen is -1.6 ppb per degree C. 1/10 of that would be 0.16 ppb/C. I would hope that the oscillator in your Thunderbolt is much better than that.
I suspect that the temperature cycling has the poor little gizmo a bit confused.
Bob
On Dec 28, 2009, at 11:20 AM, Mark Sims wrote:
>
> Ever wonder if a +/- .01C temperature cycle would have any measurable effect on the Thunderbolt oscillator? Well, wonder no more...
>
> Attached is a plot (in red) of the fast Fourier transform of the Tbolt oscillator data. The temperature was cycling +/- .01C with a period of 635.6 seconds. That big red spike in the FFT data (just under the ':' in the Filter: in the plot) is also at 635.6 seconds.
>
> Ignore the OSC tempco value shown since that measurement needs to be done with the oscillator undisciplined and the temperature moving... the true value is around 1/10th that.
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