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 [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
