[ntp:questions] Garmin GPS18x LVC 5m - Centos 5.5 - Kernel 2.6.18 - gpsd

Q .. at ..
Wed Dec 29 18:37:49 UTC 2010


"Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in message 
news:YMydnf06Ubkhp4fQnZ2dnUVZ_hOdnZ2d at giganews.com...
>
> Probably the most important thing is to know how to restore your original 
> kernel!!!!!!  If you don't know that you are *REALLY* playing with fire!

I'm not too worried about that - I can boot into a working kernel. I have no 
problems with linux sys admin stuff so I'm OK to poke about with it in that 
sense.

Anyway I did some more testing last night and changed some settings and 
upgraded ntpd see the new stats below from about 12 hrs of happy running.

Still seeing NMEA as a false ticker a lot of the time and I'm still getting 
swings from - to + offset.

The PPS output looks much more happy now - this was solved with flag2 1 on 
the PPS fudge line in the ntp.conf - I suspect for some reason ntp was 
looking at the wrong edge of the pulse.

I'm also keeping an eye on David's thread about the change to the firmware 
and the fact the NMEA comes out at 'odd' times - I was running that version 
of software from day 1.

xSHM(0)          .GPS.            0 l   49   64  377    0.000  -37.963 
8.816
*SHM(1)          .PPS.            0 l   16   16  377    0.000   -0.046 
0.002
xSHM(0)          .GPS.            0 l   16   64  377    0.000  -24.151 
10.470
*SHM(1)          .PPS.            0 l   15   16  377    0.000   -0.047 
0.004
xSHM(0)          .GPS.            0 l   46   64  377    0.000  -15.914 
16.791
*SHM(1)          .PPS.            0 l   13   16  377    0.000   -0.020 
0.027
+SHM(0)          .GPS.            0 l   17   64  377    0.000    1.588 
31.972
*SHM(1)          .PPS.            0 l    -   16  377    0.000   -0.025 
0.017
xSHM(0)          .GPS.            0 l   16   64  377    0.000  -10.837 
10.440
*SHM(1)          .PPS.            0 l   15   16  377    0.000   -0.024 
0.005


ntpq -c rv
associd=0 status=0415 leap_none, sync_uhf_radio, 1 event, clock_sync,
version="ntpd 4.2.6p2 at 1.2194-o Fri Jul 30 20:46:23 UTC 2010 (2)",
processor="i686", system="Linux/2.6.18-194.11.3.el5", leap=00, stratum=1,
precision=-19, rootdelay=0.000, rootdisp=0.382, refid=PPS,
reftime=d0c5fc86.54a475af  Wed, Dec 29 2010 18:29:26.330,
clock=d0c5fc88.2e4dac15  Wed, Dec 29 2010 18:29:28.180, peer=42477, tc=4,
mintc=3, offset=-0.009, frequency=-19.739, sys_jitter=0.124,
clk_jitter=0.017, clk_wander=0.004 





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