You will find all the info you need at this site.
http://www.boulder.nist.gov/timefreq/index.html
Let me know if you need other data. Since I work at NIST I can
look it up in several ways.
73 Jim K4CGY
--- "Dr. Gerald N. Johnson, electrical engineer"
<geraldj@isunet.net> wrote:
> Ground wave at HF is as good for frequency stability as world
> wide
> propagation on 20 and 60 KHz. In fact the transmitter
> frequencies of WWV
> on HF are monitored at Boulder some miles from Ft. Collins.
>
> I don't recall how the frequencies of WWVH are monitored and
> controlled.
> I'm sure its on a NBS web page mimicking one of their frequency
> standards publications.
>
> 73, Jerry, K0CQ
>
> --
> Entire content copyright Dr. Gerald N. Johnson, electrical
> engineer.
> Reproduction by permission only.
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