li...@philpem.me.uk said: > Interesting that the three receivers with issues were all SiRF III > based. Do you know what firmware these were running?
Nope. If you know the recipe to find out, I'll ask them. :) I just scanned their NMEA documentation and didn't see any way to get it. > How are you running the comparisons -- comparing against public NTP servers? The data gets collected on a system without PPS, but it's sitting next to a machine that does have PPS from a Z3801A. So their is some noise on the reference time, but not much on the scale of a 100 ms that the SiRF chips wander over. > I'm just curious, there's a pair of Fastrax SiRF III modules that I > was going to wire up for testing (and maybe use for a GPSDO), but > your test results have planted the seeds of doubt! I expect the PPS output is still OK. It's just that the software is off by one in some strange pattern when a leap second is pending. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
