[ntp:questions] 1000s offset between GPS module and NTP servers

Lloyd Dizon thecarrionkind at gmail.com
Tue Jan 24 20:19:48 UTC 2017


Hi all.
I'm using this GPS module with a MTK3339 chipset. Bought from here:
https://www.adafruit.com/product/790
And I'm using ntpd with have PPS support compiled-in.

Juergen, thanks for pointing out the documentation. I've understood more
about NMEA receivers now.

I've tried Brian's and Juergen's server and fudge configuration, using
time2 to align with the NMEA data-stream and now getting better results.
I don't have a scope, so how do you suggest I determine the correct values
to use for time2 ?

server 127.127.20.0 mode 17 prefer minpoll 4 maxpoll 4
fudge  127.127.20.0 flag1 1 flag3 1 time2 0.500 # pps kernel msg offset .5s


     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
*GPS_NMEA(0)     .GPS.            0 l   15   16  377    0.000  -49.176
25.007
+time.sunrise.ne 195.141.230.78   2 u   22   64  377    8.357  114.864
17.534
+192.33.214.47   129.194.21.195   2 u   23   64  377   13.382  115.777
18.286
+ntp0.as34288.ne 85.158.25.74     2 u   32   64  377    6.914  113.929
17.013
+eudyptula.init7 217.147.223.78   3 u   26   64  377    9.683  115.067
17.673




regards.
Lloyd


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