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 <time-nuts@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 > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.