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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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? -- The suespammers.org mail server is located in California. So are all my other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited commercial e-mail to my suespammers.org address or any of my other addresses. These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.9/382 - Release Date: 7/4/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.9/382 - Release Date: 7/4/2006 _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
