[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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