[time-nuts] questions on uncompensated crystal oscillators

[Mike Feher]

Well as I said, it was what I recalled, which does not make it right. It is
a little clearer now, it seems it has to do with the temperature vs.
frequency of the fundamental as compared to the temperature vs. frequency at
the 3rd overtone mode of the same crystal. This is vague and is a result of
numerous discussions with John Vig of the Army Research Laboratories that I
had about 20 or so years ago. It came about as desire by the army to build
miniature TCXOs that equaled the accuracy of ovenized units, but, did not
require the power. Sorry I muddied the waters unnecessarily. Regards - Mike 

 
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
 
 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: Wednesday, July 05, 2006 4:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] questions on uncompensated crystal oscillators


> As I recall there is a hysteresis effect on the frequency vs.
> temperature curve that needs to be compensated for as well. - Mike 

Is there really hysteresis, or does it just look that way due to time lag 
between where the temperature is being measured and that actual temperature 
at the crystal?

If there is, what's the mechanism?


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