By unplugging the wrong cable on leaving my lab, I found out that my Jupiter (nav) receiver drifted 180ms in 36h. A Meinberg GPS167, with a standard OCXO drifted 1.8ms in the same time.
-- Björn On Fri, December 15, 2006 0:18, Randy Warner said: > Hal, > > I can't speak for all receivers, but the Motorola's decay gracefully for > about an hour. There will be a significant error (us level would be my > guess). I'll have to try one. Again, if you are a ns chaser this will > obviously be acceptable, but we have several customers that let the > receiver run outside and get all happy and then disconnect the antenna > before they take it inside to be used as a reference for some > (hopefully) short period of time. I wish I knew the application, but as > a patriot I'd probably have to kill myself if they told me..... > > > Randy > ________________________________________________________________________ > ________________________________________________________ > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Hal Murray > Sent: Thursday, December 14, 2006 2:50 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Best GPS 1PPS Accuracy > >> The beauty of a GPSDO is that you're only changing the DAC every few >> minutes so there's plenty of time to look carefully at the quality of >> your 1 Hz samples before you commit the DAC update. > > I think this discussion started with somebody asking about the last few > PPS signals before the signal quality was declared to be no-good. > > My guess is that they might be significantly in error. That's a > systematic error rather than a glitch that's easy to filter out. > > Has anybody measured this? I'm thinking of something like setup a GPS > unit with a poor antenna and record the PPS times relative to a good > house standard as well as the RS-232 text that has the good/bad flag. > Then eyeball the samples around the time the flag changes. > > > > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts