-------- In message <299B45118C9248498D7B4F3AFE72231E@pc52>, "Tom Van Baak" writes:
>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. Whispering gallery sapphire resonators at cryogenic temperatures is a thing for phase-noise, but those are dielectric (microwave) resonators, not piezoelectric resonators. > Would that dramatically lower temperature improve phase noise & > short-term performance? Yes it will reduce your thermal noise as a source of PN, and dramatically so. But I doubt short and long term performance will improve. Even if you can find a zero-turnover cut at a convenient temperature, I don't think anybody know how to produce mK temperature *stability* at cryogenic temperatures ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ 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.
