Hi If you dig back in the FCS archives, you will find papers on “cold” OCXO’s. You also will find papers on cryo cooled quartz. The bottom line appears to be that if you are going to all the trouble of cooling things, sapphire (or other exotic materials) are a better bet.
Quick simple answer: not enough improvement in ADEV, aging, or phase noise to make it wroth it. As PHK mentioned, coming up with a “ideal” cut for your arbitrary temperature cryo setup is non-trivially difficult ( = plan on spending a few million dollars and a lot of years). Bob > On Apr 2, 2018, at 3:46 PM, Tom Van Baak <t...@leapsecond.com> wrote: > > Has anyone tried running a quartz oscillator at liquid nitrogen temperatures: > -196 C (-321F, 77K)? It's probably impractical commercially, but maybe > something of value to a time nut. Would that dramatically lower temperature > improve phase noise & short-term performance? Is there a crystal cut that > could be optimized for 77 K instead of ~25 C (room) or 60 C (oven)? > > If not Nitrogen, how about dry ice (-109F -78C)? > > /tvb > > _______________________________________________ > 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.
