On Apr 7, 10:36 am, [EMAIL PROTECTED] (Hal Murray) wrote: > >I still have a question unanswered: are there any method to pass over > >a long GPS failure (say for several days or more) - supposing the GPS > >is the > >only source of time and the server have a very good (10E-12) PPS > >source (Rubidium or Caesium) ? > > Google for Z3801A. It's basically a box with a very good crystal > oscillator, a GPS receiver, and a pile of software. If the GPS > goes down, it coasts on the crystal. > > How long you can coast depends upon how good your clock is and/or > your accuracy requirements.
Hal, I have the GPS receiver (many), I have the Rubidium standard (many), I have a PC with FreeBSD (or any other good OS needed) and, of course, we all have NTPD. My questions was how can I make this system to depend as little as possible on the GPS signal. I exposed a solution - by the two "prefer" kewords. This is a good solution as the drift after four days was negligible (<1E-6). Other opinions on this configuration ? _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
