); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY 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: [EMAIL PROTECTED] 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 <[EMAIL PROTECTED]> >>Sent: Oct 13, 2007 2:44 PM >>To: Discussion of precise time and frequency measurement <[email protected]> >>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 >> >>_______________________________________________ >>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. > _______________________________________________ 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.
