In article <[EMAIL PROTECTED]>, Unruh <[EMAIL PROTECTED]> wrote:
> Steve Kostecke <[EMAIL PROTECTED]> writes: > > >On 2008-03-07, Hal Murray wrote: > > >>ATTRIBUTION MISSING wrote: > >> > >>>I have problem with my stratum1 box. My box include: freebsd > >>>5.2-RELEASE without PPS , ntp-4.2.0_1, Intel Pentium III, 40 G IDE, > >>>Germin GPSmap60 , connect with serial com. In GPSmap60 set as NMEA. > >>>Freebsd box can get NMEA input string. My configuration of ntp.conf > >>>like this: > >>> > >>>server 127.127.20.0 mode 1 prefer minpoll 4 > >>>server 127.127.1.0 minpoll 5 > >> > >> Most NMEA devices (or at least all the ones I've worked with) > >> send their text with a significant offset. > > >It gets even better ... NMEA sentences are output by the GPS device > >when it is not busy. This means that there is no fixed relationship > >between the top of the second and the NMEA sentence. And there will be > >significant jitter. > > Ie, NMEA is good for getting the second, not for getting any better > accuracy (well maybe 1/10 sec) If you want accurate time get a gps with PPS > output. > Otherwise there is no advantage of NMEA over a network ntp connection. Well, except for the "no wires" part... Isaac _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions