Hi Everybody I have ever talked to about the internal disciplining on Rb’s comes up with “it’s not for a GPSDO” somewhere in the first minute of the conversation. The objective seems to be to tune the unit to a perfect source to speed up the calibration process. The idea never appears to include noise on the reference signal or odd perturbations in the reference.
Bob > On Oct 24, 2017, at 6:42 PM, Mark Sims <hol...@hotmail.com> wrote: > > I did a quick silly experiment where I took a PRS-10 disciplined by an X72 > which was disciplined by the PRS-10. The result seemed to have created a > rupture in the space-time continuum. Nobody was happy... they didn't seem > to agree on who was in charge. I need to try it again now that I have my > X72 interface boards back from China and can properly connect to the X72. > > BTW, the firmware based disciplining on the X72 seems to be rather crappy. > It has lots of trouble locking to less than perfect 1PPS inputs. For > instance it goes into holdover mode over half the time when driven by a Ublox > LEA-5T (which seems to have like +/- 60 ns jitter on the 1PPS. It does lock > fine with a Tbolt... but needing a GPSDO to discipline a rubidium sort of > defeats the purpose of disciplining a rubidium. > > Lady Heather now has an X72/SA22 disciplining routine built in that works > fairly well using the LEA-5T. Adevs are in the mid E-13 range at 10,000 > seconds and the 1PPS output is in the +/- 50 ns range. > _______________________________________________ > 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.
