[time-nuts] PPS offset between GPS receivers

Gabs Ricalde gsricalde at gmail.com
Tue Dec 11 08:05:51 UTC 2012


I'm now using the SKG25A1 as a PPS source for an NTP server. Aside from
the offset, I noticed a large offset jump in the NTP loopstats
(attached) occurring about once a day. This is not the server oscillator
drifting since the frequency graph looks good at this point and this
behavior can sometimes be triggered by issuing an NMEA hot start
command.

I saw this report showing large differences between the PPS outputs of
different receivers:
http://www.gmat.unsw.edu.au/snap/publications/mumford_2003a.pdf
I'm planning on getting two receivers for comparison, an iLotus M12M and
a Synergy SSR-6T (preferably with the discount). No replies from both
yet.
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