Bob: With a GPSDO as a general rule is there much variation of the 0.005 to 0.02 ppb range. Would there me much if only 2 satellites were visible but the unit was no in holdover vs say 6 satellites. I assume there is probably a lot of variables such as quality of GPSDO and OCXO, multi path interference, antenna location, etc, but worse case what would a user expect assuming the unit isn't in holdover.
-=Bryan=- > From: [email protected] > Date: Fri, 19 Aug 2016 20:03:59 -0400 > To: [email protected] > Subject: Re: [time-nuts] Expected 10 MHz offset from a GPSDO? > > Hi > > Ok let's toss some numbers into the mix. > > The counter time base one day after calibration is in the 0.5 to 1.5 ppb > range. > > The LPRO ten years after it left the factory is in the 0.5 to 1.5 ppb range. > > The GPSDO when running properly should be in the 0.005 to 0.02 ppb range at > one second. > > One ppb at 10 MHz is 0.01 Hz. It also is a the resolution limit on a 5335 at > 1 second. > > Bob > > > > > On Aug 19, 2016, at 5:29 PM, Mark Sims <[email protected]> wrote: > > > > Try driving your counter frequency reference input with the LPRO or > > comparing the LPRO with the GPSDO. The LPRO is (most likely) much more > > accurate the counters' internal timebase. > > _______________________________________________ > > 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.
