[ntp:questions] Windows time question.

Uwe Klein uwe at klein-habertwedt.de
Sun Apr 24 08:14:43 UTC 2011

Terje Mathisen wrote:
> Depending upon the cut, quartz crystals can be more or less 
> temperature-sensitive, so it is in fact possible to get one that will 
> wander less when the surrounding temperature changes.

AT cut at ~10MHz has best performance.
> A TCXO avoids the problem, as you noted, by having a 
> thermostat-controlled oven which keeps the temperature more or less 
> constant.
> The most energy-efficient approach is to have a tiny temperature sensor 
> on or near the crystal, then use a sw lookup table to compensate for 
> temperature swings.

OCXO  Oven Controlled ...
TCXO Temperature Comensated ...

TCXOs have made quite a rise in the last decade.
       (you can't use an oven in a demand powered device like
         GPS or mobile phone )


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