[time-nuts] WWV / WWVB Reference Feed

[Tom Van Baak]

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
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