[ntp:questions] fudge time1 for gps-18x-LVC?
snews at lordynet.org
Fri Feb 5 12:48:20 UTC 2010
Now I have gps-18x-LVC nmea 127.127.20.0 along with
parallel port PPS using pps0 at ppbus0.
This seemed to work ok until pps timestamps suddenly jumped to
-350ms then PPS became false then deselected.
To correct for this I've set fudge "127.127.20.0 time1 0.65"
also "tos mindist 0.4"
Somehow I think I might be in sync with wrong edge of PPS.
Eventually I've got an ethernet cable running upstairs
(3 x long cables + 2 couplers).
I've added 3 x local servers sync to MSF + public servers
and marked noselect.
About 30 min later "ntpq -p" has:
source reach offset(ms)
+ GPS 377 23.247
o PPS 377 -0.298
serv1 377 -1.295
serv2 INIT 0.000
serv3 377 -0.091
I suspect reason for INIT is both serv1 and serv3 have serv2
selected. The GPS offset has been varying +/- a lot but pps
still seems to be converging.
That looks ok to me except only Google hit for gps18x-lvc +
"fudge time1" gives setting of 0.0001
What does anyone else use for this fudge time1?
I'm using default nmea strings as garmin loses its settings
otherwise whilst not powered up.
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