[time-nuts] Msg to N.Z. time nuts
Hal Murray
hmurray at megapathdsl.net
Mon May 18 20:49:17 UTC 2009
lists at 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.
More information about the time-nuts
mailing list