[ntp:questions] using both a PPS source and a HBG (dcf-77-like) timesource?

Folkert van Heusden folkert at vanheusden.com
Mon Jan 14 17:48:30 UTC 2008


> > Well if I remember correctly someone said to me once that the
> > time-string returned by cheap gps device (like my garmin 18 lvc)
> > sometimes is a bit off while its PPS signal is fine.
> > 
> > Currently I'm syncing against NMEA/PPS and seeing quiet a big offset:
> > 
> >      remote           refid      st t when poll reach   delay   offset  jitter
> > ==============================================================================
> > xGPS_NMEA(0)     .GPS.            0 l    7   16  377    0.000  -185.08   1.001  <---
> <snip>
> You can even out that delay in the GPS time by using the 'fudge' option. 
> Example:
> server 127.127.20.0 minpoll 4
> fudge  127.127.20.0 time1 0.185
> I do the same thing with my GPS 18 LVC, only I use gpsd with the SHM drivers.

Ok but the odd thing is: a friend of mine has the exact same garmin 18
lvc but not this big offset?


Folkert van Heusden

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