[time-nuts] Improving the stability of crystal oscillators

Richard W. Solomon w1ksz at earthlink.net
Sat Oct 13 19:53:34 EDT 2007

Sam Harris (SK) did that over 40 years ago. It provided a stable
reference for his pioneering work in Moonbounce Communication.

73, Dick, W1KSZ/7

-----Original Message-----
>From: Bruce Griffiths <bruce.griffiths at xtra.co.nz>
>Sent: Oct 13, 2007 2:44 PM
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
>Subject: Re: [time-nuts] Improving the stability of crystal oscillators
>Brooke Clarke wrote:
>> Hi:
>> 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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