David:
Thanks. I threw your suggestion into ntp.conf and it appears to
be doing better. Although I had to modify the time1 from 0.651 to 0.850.
I still might tweak that, but for now GPS_NMEA is the favorite
in my list and hasn't changed since it sync'd.
NOTES:
======
godzilla:/etc# ntpq -p
remote refid st t when poll reach delay offset
jitter
==============================================================================
-time.nist.gov .ACTS. 1 u 13 256 377 55.940 33.040
7.125
-ntp-nasa.arc.na .GPS. 1 u 21 256 377 91.018 37.884
5.590
-tick.usask.ca .GPS. 1 u 12 256 377 90.859 34.895
4.456
-ntp.alaska.edu .GPS. 1 u 9 256 373 131.397 31.648
5.831
+timekeeper.isi. .GPS. 1 u 5 256 377 88.070 29.832
6.597
+ntp2.usno.navy. .USNO. 1 u 7 256 377 68.397 26.230
5.577
*GPS_NMEA(0) .GPSb. 0 l - 64 377 0.000 17.842
12.029
PPS(0) .PPSb. 0 l - 16 0 0.000 0.000
0.001
godzilla:/etc#
On Mon, February 28, 2011 7:32 pm, David Lord wrote:
>
> 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-----
> _______________________________________________
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>
>
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