[time-nuts] Improving the stability of crystal oscillators
brooke at pacific.net
Sat Oct 13 20:19:53 EDT 2007
I've also looked into drilling a hole (garden hose, 90 deg fitting & pipe with
end smashed flat to make a nozzle will easily drill as deep as the pipe is
long). Then using a short length of capped copper pipe at the bottom and the
Like I think here in California wine country 4 feet would be plenty deep. But
this method only works at your home location. Not too good for a clock that
will be sent to someone else.
I think the long time constant method can be done in a few cubic inches.
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
Bruce Griffiths wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> 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.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts