Hi The question was “Rb ensemble” …. AFIK you would have to go back quite a way to find NIST running one….
Bob On May 30, 2014, at 7:52 PM, Magnus Danielson <[email protected]> wrote: > Bob, > > The long tube Cs standard (NIST 7) is parked in the entrance. Too noisy to > contribute much value. They have a bunch of 5071As and hydrogen masers. They > live in individually temperature stabilized compartments. One typically is > selected as the reference and then you measures differences. With these > differences they then run the ensemble program on a pair of redundant PCs > every 12 min. > > Cheers, > Magnus > > On 05/30/2014 09:24 PM, Bob Camp wrote: >> Hi >> >> Rubidium ensemble? That would have been quite a while back. They have been >> running on long tube Cs standards for quite a while. >> >> Bob >> >> On May 30, 2014, at 2:03 PM, Tim Shoppa <[email protected]> wrote: >> >>> What did NIST do with its Rubidium ensemble before they got the cesium >>> fountain? >>> >>> Did they break one of the rubidiums off the ensemble, maybe in a >>> different room with different HVAC, and look at the one vs many? >>> >>> Would that be useful for OCXO's, measuring one OCXO against an ensemble? >>> >>> Tim N3QE >>> >>> On 5/30/14, [email protected] <[email protected]> wrote: >>>> Hi, >>>> >>>> I usually don't use drift removal as I want to see the effects of drift! >>>> >>>> The effects of oscillators locking together are very apparent on both the >>>> phase and AD plots when using a DMTD system. There was no indications of >>>> such locking! >>>> >>>> My point was that if you are measuring ultrastable Quartz oscillators >>>> against each other the AD at the higher Tau will not reflect the true >>>> stability of the oscillators. >>>> >>>> Only a Maser or high performance Rubidium (HP5065A) will reveal the true >>>> behavior. >>>> >>>> Cheers, >>>> >>>> Corby >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
