[time-nuts] Improving the stability of crystal oscillators
bruce.griffiths at xtra.co.nz
Sat Oct 13 17:44:46 EDT 2007
Brooke Clarke wrote:
> Something I've been thinking about is attaching a large thermal mass of
> aluminum to the crystal and it's oscillator then surrounding that with
> insulation. Then surround that with a thin copper layer. Temperature sensors
> on the copper and aluminum. If the thermal time constant could be made very
> close to 24 hours, or integer multiples of that, it might be possible to
> predict the inner temperature allowing compensation.
> Has this already been done?
Why stop there?
Try burying the oscillator under 6ft or so of soil.
The daily temperature fluctuations at this depth are very small.
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