Don't forget the ion fountain to check the H Maser :-) Sent from my iPhone
On Jan 23, 2013, at 5:35 PM, "J. L. Trantham" <[email protected]> wrote: > Russ, > > You might want to consider stopping to think about it now. Otherwise, > you'll wind up with a Cesium Standard to check the GPSDO, a collection of > OCXO's and Rb's to see which is the best, not to mention all the test > equipment needed to carry out those measurements, and, perhaps, a MASER to > check the CS. > > Having done what you are contemplating, I vote for the GPSDO and a TBolt is > a great choice. I would recommend a linear power source rather than a > 'switching' power supply. Otherwise, get a switching power supply with > higher voltages than needed and use some linear regulators downstream to > generate the +12, -12, and +5 needed for the TBolt. > > Good luck. > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Russ Ramirez > Sent: Wednesday, January 23, 2013 2:24 PM > To: [email protected] > Subject: Re: [time-nuts] time-nuts Digest, Vol 102, Issue 89 > > Hi Bob, > > That's a good point and not nit picking. While my particular HP 5334A > counter (sans 1.3 GHz channel C option) only measures with this kind of > resolution at lower frequencies, I will be using the source for my Fluke > 6060B (instead of the 5334A's output as I do now) which can produce a 1050 > MHz signal, and of course any future test equipment needs. So yeah, I > suppose I'd appreciate having a 1 ppb accuracy now that I've thought about > it. Thanks. > > Russ > > On Wed, Jan 23, 2013 at 1:45 PM, <[email protected]> wrote: > >> Message: 8 >> Date: Wed, 23 Jan 2013 14:48:36 -0500 >> From: "Bob Camp" <[email protected]> >> To: "'Discussion of precise time and frequency measurement'" >> <[email protected]> >> Subject: Re: [time-nuts] Least costly 10 MHz reference solution >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset="US-ASCII" >> >> Hi >> >> Not to pick nits, but 7 decimal places at what input frequency? Seven >> places is 10 ppb at 10 MHz. If the input was 100 MHz, it would be 1 >> ppb. >> >> The distinction is significant, since it crosses a boundary. At 10 >> ppb a free running Rb is fine with no adjustments. At 1 ppb, some >> adjustment might be needed. >> >> You might also want a standard that's 5X better than the expected result. >> That would get you into the 2 to 0.2 ppb range. >> >> Lots of fiddly little details... >> >> Bob > _______________________________________________ > 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.
