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. > _________________________________________________________________ > Hotmail: Free, trusted and rich email service. > http://clk.atdmt.com/GBL/go/171222984/direct/01/<oscfft.gif>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
