[time-nuts] quartz / liquid nitrogen
Poul-Henning Kamp
phk at phk.freebsd.dk
Mon Apr 2 19:58:50 UTC 2018
--------
In message <299B45118C9248498D7B4F3AFE72231E at 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
phk at 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.
More information about the Time-nuts_lists.febo.com
mailing list