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 <[email protected]> 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 > > _______________________________________________ > > 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. > _______________________________________________ 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.
