[time-nuts] Improving the stability of crystal oscillators

[Brooke Clarke]

Hi Dick:

 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?

Have Fun,

Brooke Clarke, N6GCE
http://www.PRC68.com
http://www.precisionclock.com
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:
>>
>>>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?
>>>
>>>  
>>
>>Brooke
>>
>>Why stop there?
>>Try burying the oscillator under 6ft or so of soil.
>>The daily temperature fluctuations at this depth are very small.
>>
>>Bruce
>>
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> 
> 
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