Tom Van Baak said on Aug 29, 2013: >The pursuit of precision tends to be exponential rather than linear. ... >As a rough example in the ADEV world: >- for 1e-11, you can buy almost any XO, TCXO, or risky OCXO for $10. >- for 1e-12, you can find a reputable OCXO on eBay for under $100. >- for 1e-13, you can find an old but maybe working cesium clock for 1 k$. >- for 1e-14, spend 10 k$ and get a certified working hp 5071A. >- for 1e-15, spend 100 k$ and find a used active H-maser. >- for 1e-16, spend 1 M$ to hire physicists and build a Cs fountain. >- for 1e-17, spend 10 M$ to fund a national research institute to build ion or >optical clocks.
Add the 1k USD running cost per year just to keep the active maser running. I think that chances of finding an active H-maser used are near 0. Better to stick with GPSDOs: they bring into your home the stability and accuracy of the USNO UTC (well, close to...). On Wed, Jul 10, 2019 at 2:00 PM Perry Sandeen via time-nuts <time-nuts@lists.febo.com> wrote: > > Yo Bubba Dudes!, > OK, I'll finally ask the question that probably a lot of list members wanted > to know but were reticent to ask. > First, what is the price of one of a new Hydrogen Maser? (This is important > if I win the lottery.) > Second, what would be prices for used Hydrogen Maser in *reasonable* working > condition and what might be the long term costs to keep it running? > Thirdly, what are the chances of finding a used one? > Then again, might it be better, money wise just to limp along with used HP Cs? > Regards, > Perrier > > > > _______________________________________________ > 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.