[time-nuts] WWV / WWVB Reference Feed

[John C. Westmoreland, P.E.]

Tom,

Thank you for the paper references.

(73's) Best Regards,
John Westmoreland
AJ6BC



On Wed, Aug 12, 2020 at 8:38 PM Tom Van Baak <tvb at leapsecond.com> wrote:

> 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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