[time-nuts] Thunderbolt oven / non-stable operating temperature
Tom Van Baak
tvb at LeapSecond.com
Wed Dec 12 05:03:40 UTC 2012
>>Although the Trimble oscillator has superb phase noise
>>performance, it has TERRIBLE temperature sensitivity.
> It appears that most do but some don't. Between the results I have
> seen posted on the list (Lady Heather screen shots) and my own data,
> they seem to fall into two groups. I have two with excellent
> oscillator tempcos, but a third unit I have is about 100x worse and
> the sign of its tempco is reversed compared to the first two. That
This is interesting and I'd like to pursue it. I still have a pile of original TAPR-Thunderbolts here so without too much effort I can gather tempco statistics for you. I tested the TAPR lots for phase noise and ADEV and DS1620 granularity, but did not test free-run tempco of the OCXO.
<rant> Please don't use the word "TERRIBLE". It's relative to XO, TCXO, OCXO, DOCXO, etc. This is time-nuts, not some feel-good audiophile list. We are allowed to make objective experiments and use scientific notation. The units for tempco involve Hz and C, or dF/F per K, etc. Given that, do either of you have actual tempco numbers? </rant>
Bob, do you have experience or an explanation for the bi-model tempco grouping that they have observed?
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