> Can anyone tell me how accurate WWV's frequency is on the 10MHz signal?

Sure, NIST for one.  The carrier frequency is derived from atomic clocks
at the transmitter near Colorado Springs, which are perodically compared
and calibrated to the standard in Boulder.

> I
> want to adjust a crystal oscillator to as close to 10MHz as I can

It's WAAAYY more accurate than a crystal.  One problem at 10MHz is that
there can be phase shifts due to the signal skipping off the ionosphere at
different altitudes.  Unless you are close enough to the transmitter to
get mostly ground wave, this could cause trouble.  Note that NIST specs
WWVB to tighter tolerances and the ground wave reaches farther do to its
much lower frequency.  This would be a better choice, although you can't
directly beat a 10MHz signal against the carrier.

Another option is to use the color subcarrier from a major television
network.  These are also derived from atomic clocks and used to be
(probably still are) traceable to the national standard.  In either case,
this frequency will be considerable more accurate than any crystal.


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