Hi I believe the paper was by Stan Shadowski. I’m *certain* I’ve mis-spelled his last name, which is indeed a very poor move on my part. I would not be surprised if there are several co-authors.
I don’t have the UFC indexes here at home so I have no quick way to look it up. Bob On Mar 2, 2014, at 7:40 PM, Jim Lux <[email protected]> wrote: >>>> As Jim mentions in another post, you can run on the fundamental and the >>>> third (or 5th or 7th) and get a thermometer out of the delta between the >>>> two modes. The gotcha is that a change in load impedance will shift the >>>> frequencies unequally. That will give you an apparent temperature change. >>> >>> I already know about the fundamental and third trick, my question was if it >>> could be done to AT-cut as well. I interpret your statement as yes, it >>> does. I don't trust it to be perfect, but reasonable. Ideas for means to >>> handle shift would be welcome. >> >> It was originally proposed by a very nice guy from Ft. Monmouth for use with >> AT cut resonators. I believe the paper is in the FCS proceedings from the >> mid 1980’s. The DOD kept rights to the technique and licensed it to a couple >> of oscillator companies. > > > Hmm. SC cut, perhaps? (see the third reference down.. > > R. L. Filler and J. R. Vig, “Resonators for the microcomputer compensated > crystal oscillator,” 43rd Ann. Symp. Freq. Contr., pp. 8- 15, 1989. > > > there's also > > The microcomputer compensated crystal oscillator (MCXO) > > Bloch, M. ; Frequency Electron. Inc., Mitchel Field, NY, USA ; Meirs, M. ; > Ho, J. > The MCXO uses a novel technique to achieve temperature compensation without > the use of ovens or conventional temperature-compensating components. The > crystal oscillator in the MCXO, which is free to vary with temperature, > operates on two modes simultaneously-the fundamental and the third overtone. > Several advantages accrue because this method of temperature compensation > does not resort to frequency pulling. The authors presents the details of how > the MCXO operates and the details of the performance of the delivered systems > Published in: > Frequency Control, 1989., Proceedings of the 43rd Annual Symposium on > Date of Conference: > 31 May-2 Jun 1989 > > Page(s): > 16 - 19 > Meeting Date : > 31 May 1989-02 Jun 1989 > INSPEC Accession Number: > 3685419 > > Conference Location : > Denver, CO > Digital Object Identifier : > 10.1109/FREQ.1989.68853 > > > > > But then, > > Yoonkee Kim (from Ft Monmouth) > has a paper (DTIC ADA484423) > Aging of Dual Mode Resonator for Microcomputer Compensated Crystal Oscillator > Abstract— A Microcomputer Compensated Crystal Oscillator (MCXO) utilizes the > dual c-mode excitation (fundamental mode and 3rd overtone (OT)) of an SC-cut > resonator for self- temperature sensing and compensation. The long-term > stability of the MCXO depends primarily on the aging of the dual mode > resonator. When two modes age differently in time, the aging MCXO’s output > frequency curve would shift with a tilt over its operating temperature range > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
