[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 

Mark, Charles,

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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