I think you are missing the key selling point of this device, namely it's long term stability and accuracy of a few parts in 10^15. From my point of view as a national timekeeper, this is much more useful than good short term stability. UTC reporting is at 5 day intervals so what the clock does at 1000 s is not so important. By the way, there is another comparison with 12 NIST masers in the current brochure: https://spectradynamics.com/product-sheets/cRb-Clock-2019.pdf There are evidently two models of maser here ,which politely, they do not identify.
Cheers Michael On Sat, Nov 9, 2019 at 11:00 AM <cdel...@juno.com> wrote: > > Well I have been looking at the data in the > > https://www.researchgate.net/publication/325499937_A_portable_cold_87_Rb_ > atomic_clock_with_frequency_instability_at_one_day_in_the_10-15_range > > link and find that maybe they are overstating their performance! > > In the plot of figure 5 my HP 5065A almost perfectly matches the Allan > deviation > out to 1000 Sec.! (Although mine does have VERY good performance) > > Also if you look at figure 7 all the Maser data shown seems to be from > poorly > operating Masers so any judgement of better clock performance versus the > Masers > is a bit much! > > The figure 5 data looks much better but still is not beating a good > active Maser. > > The EFOS2 a 1982 vintage Maser as well as the MHM 2010 and several other > modern Masers > I could find data for show between 2 and 5X10-15th at 1000 Sec. > The MHM 2010 specs at 5X10-15th at 100Sec and 2.0X10-15th at 1000Sec > All the Masers shown are worse than that spec! > Also my old Kvarz passive maser has 2x10-13th at 100 Sec just shy of > matching the top two Masers at 100Sec, which I don't believe! > > Something does not add up in their data! > > So I'm not really that impressed and would take an Active or Passive > Maser anyday. > > Just wonder if some 5065A can get so impressive that they don't just > make a modern large/cool cell classic Rubidium with modern electronics > technology! Certainly would be cheaper and more long lived also. > > Just my thoughts! > > Cheers, > > Corby > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.