In message <02d201d3d1b1$d7318640$859492c0$@joshreply.com>, tn...@joshreply.com 

>That comes out to about 30ppb, and this is a pocket watch so they don't seem
>to depend on the temp stabilization of being attached to a human wrist. 

For an application where neither phase noise nor jitter matters,
it is certainly feasible to measure the tempco of the X-tal at the
factory and let a micro-power computer use temperature measurements
to model the "perfect" frequency and phase.

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.
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