A few comments I forgot. Most Rb's can use a clean up loop, we are experimenting with Wenzel's 600 second loop recently posted here. Exceptions are the HP 5065 the optical unit is the source of the performance, Corby experimented with different OCXO, performance remained the same. Loop time constant is 0.01 second. There is also no way to improve PRS 10 performance it will stay at 2 E-12 because of DAC resolution.On related subject Corby and I community regularly and he mentioned in all his 5065 work he has never experienced a bad lamp!! We focus our Rb work on FRK/M100 because next to the 5065 it has the largest cell and it is easy to work on. Focus right now is OCXO and reducing time constant. If positive results we may look at inserting an optical filter, Corby did experimented with it but forgot reducing the time constant. Bert Kehren In a message dated 11/22/2017 7:26:57 P.M. Eastern Standard Time, k8yumdoober@gmail.com writes: For the most part the SRS-10 is a nice choice, although I'd always be wary of buying a used one. My only real beefs are that the tuning granularity is rather coarse, about 2E-12, and the disciplining loop seems to be a bit aggressive so that the poor oscillator gets jerked around quite a bit by the GPS. This makes for rather ugly-looking plots of time error over time. The above comments are derived from about 3 years of operating one as a hot emergency spare at the Arecibo Observatory against the day when the H-maser crashed abruptly. In this case the SRS-10 was embedded in an FS725 which we bought new. Dana On Wed, Nov 22, 2017 at 4:16 PM, Jerry Hancock <jerry@hanler.com> wrote: > Three questions: > > 1) Now that I’ve split my Lucent RFTG-U into a REF0 and REF1 unit with > both supplying 10Mhz and 1PPS, is there a way to combine the outputs or > some other technique to improve the short and/or long term performance? > > 2) I’ve become interested in Rubidium Disciplined Oscillators recently and > was now thinking of purchasing one of the PRS-10 that I see on Ebay. If I > did that and replaced one of the DOCXOs from one of the Lucent boxes, what > impact would this have on the overall performance both with and without > (when in hold-over)? Basically, is it worth the money to upgrade one of > the boxes to a Rubidium disciplined oscillator assuming the GPS signal is > rarely lost? > > 3) Figuring the PRS-10 will cost around $250 when all is said and done, is > there a better option to improve my GPSDO system? > > I basically use the GPSDO as a reference for any equipment that takes an > input. I have no monetary need for a reference, just an interest. > > Thanks. > > Jerry > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.