-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 28 Feb 2011 at 20:25, Rob Janssen wrote:
> Alby wrote:
> > Rob:
> >
> > I updated my ntp.conf and restarted ntpd and got the following:
> >
> >
> >
> >
> > godzilla:/etc# ntpq -p
> > remote refid st t when poll reach delay
> > offset
> > jitter
> > ====================================================================
> > ==========
> > +time.nist.gov .ACTS. 1 u 50 64 17 56.635
> > +-5.536
> > 6.242
> > +ntp-nasa.arc.na .GPS. 1 u 45 64 17 91.943
> > +8.023
> > 1.997
> > +tick.usask.ca .GPS. 1 u 47 64 17 94.198
> > +4.766
> > 1.470
> > *ntp.alaska.edu .GPS. 1 u 46 64 17 129.114
> > 2.305 3.711
> > +timekeeper.isi. .GPS. 1 u 47 64 17 92.737
> > +-0.813
> > 9.839
> > +ntp2.usno.navy. .USNO. 1 u 43 64 17 70.944
> > +-4.711
> > 8.011
> > xSHM(0) .GPS. 0 l 6 16 377 0.000
> > -872.25 24.157
> > SHM(1) .PPS. 0 l - 16 0 0.000
> > 0.000
> > 0.001
> >
> Ok, the offiset of the serial data is too much for gpsd to lock on the
> PPS. This is a problem with the latest firmware of your GPS. You will
> have to hope that the manufacturer fixes it, the previous version was
> OK.
I used "tos mindist 0.4" to overcome the problem with my
18x-LVC and version of ntp I was using on NetBSD.
Without that line ntpd tries to lock to GPS serial data
and then is out of range for PPS so coninuously flips
between the two. I've not tried GPS with a more recent
ntp which is supposed to better handle this situation.
Of course the 18x might be too far out. I had a brief
look on the Garmin site but could only find the current
firmware. My unit was purchased mid 2009 and has not
been updated.
It's possible I was using serial or parallel pps at the
time but there was no significant difference when using
serial DCD.
$ ntpq -p
remote refid st t poll reach delay offset jitter
===========================================================
+GPS_NMEA(0) .GPSb. 0 l 64 377 0.000 -7.687 13.108
oPPS(0) .PPSb. 0 l 16 377 0.000 0.000 0.002
- -k6x400 192.168.?? 2 u 64 377 0.619 0.785 0.631
+me6000gi .MSFa. 1 u 64 377 0.722 0.905 0.519
- -p4x2400c 92.168.?? 2 u 64 377 0.774 0.690 0.381
*************************
# /etc/ntp.conf:
tos mindist 0.4
server 127.127.20.0 mode 1 prefer minpoll 6 maxpoll 8
fudge 127.127.20.0 time1 0.651 refid GPSb
server 127.127.22.0 minpoll 4 maxpoll 6
fudge 127.127.22.0 refid PPSb flag3 1
server k6x400 minpoll 6 maxpoll 8
server me6000g minpoll 6 maxpoll 8
server p4x2400c minpoll 6 maxpoll 8
*************************
David
- --
David Lord <[email protected]>
<ftp://ftp.lordynet.org/pub/pgpkeys/lg_david.pkr>
<http://www.lordynet.org/pub/pgpkeys/lg_david.pkr>
-----BEGIN PGP SIGNATURE-----
Version: PGP 7.0.4 -- QDPGP 2.65
Comment: http://community.wow.net/grt/qdpgp.html
iQA/AwUBTWw+oa2RmIodDo7KEQL5rgCgoUYzMdKGi8qc+QE7T1TDYsALjN0AoPO9
OhdgZwrvs/FjFvA8CVMmu+/w
=/bjz
-----END PGP SIGNATURE-----
_______________________________________________
pool mailing list
[email protected]
http://lists.ntp.org/listinfo/pool
