[time-nuts] Improving the stability of crystal oscillators
brooke at pacific.net
Sat Oct 13 20:26:12 EDT 2007
From what I can Google he built maybe the first parametric amplifier but
haven't come across details on the crystal temp stabilization. Do you have
info about that?
Because of the year involved I think he must have just used the long time
constant to slow down the changes, or was he actually using the time of day as
a function of frequency?
Brooke Clarke, N6GCE
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
Richard W. Solomon wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> 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:
>>>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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