[time-nuts] Brand new OCXO/TCXO reccomenations

[jimlux]

On 9/25/20 8:55 AM, Mark Goldberg wrote:
> Note that many (maybe all) TCXOs exhibit a hysteresis effect when the
> temperature cycles. The stability reported on the datasheets is only
> tested with a temperature change in one direction. Cycling temperature
> up and down will result in more variation.  I've seen two or three
> times the datasheet variation when cycling some TCXOs between 0 and 50
> C and have had to super select for this. I've also seen non monotonic
> jumps. Aging is also very significant in the first few months after
> soldering.
> 

I've attached a couple plots showing the hysteresis of two different 
TCXOs (fairly good ones) - so you can get an idea of the amount of 
variation.

10 ppm easy, 1 ppm hard.
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