Don,
The main NIST frequency standards lab is in Boulder, CO where UTC(NIST)
is maintained. They have a large ensemble of clocks, ranging from
commercial cesium clocks and H-masers to "homebrew" cesium fountains and
optical clocks. The WWV/WWVB transmitters an hour north in Fort Collins,
CO and use a couple of 5071A cesium standards as their local reference.
Last I saw, Ft Collins is held synchronous with UTC(NIST) using one or
more "common view" systems. An example of such a system is:
https://www.nist.gov/programs-projects/frequency-measurement-and-analysis-service-fmas
Note that common view GPS does not mean they use GPS's time (that would
be silly). I can explain more if you want.
See also the "NIST Disciplined Oscillator", which is a clever way to get
NIST traceable time & frequency (legal metrology stuff):
https://www.nist.gov/publications/nist-disciplined-oscillator
https://www.nist.gov/publications/nist-disciplined-oscillator-delivering-utcnist-calibration-laboratory
https://www.nist.gov/publications/nist-frequency-measurement-and-analysis-system-operators-manual
/tvb
On 8/12/2020 7:35 PM, DON MURRAY via time-nuts wrote:
Hello all...
I have a question that I have been unable to answer,and I am sure one of the
learned time-nuts will havean instant answer for me!
During my searching for an answer to my question, I
learned that there is an NIST Facility at Boulder, CO
that has a 4 Cs Ensemble that is the frequency reference
for the WWV and WWVB transmitters at nearby Ft. Collins.
My question: how is that reference transferred from the NISTfacility to the WWV
/ WWVB transmitter site?
For some reason, I was under the impression that the referencefrequency for the
transmitters was locally generated at Ft. Collins.
I have searched around for the answer, but have come up emptyhanded.
TNX to anyone who might have the answer!
73DonW4WJ
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
