[ntp:questions] Peer Review of ntpq -c rv
David J Taylor
david-taylor at blueyonder.co.uk.invalid
Thu Mar 8 07:42:50 UTC 2012
"Ron Frazier (NTP)" <timekeepingntplist at c3energy.com> wrote in message
news:4F582243.10406 at c3energy.com...
> At first I was confused and thought he was ms off. However, if he's
> within 34 us, that's pretty good. Sounds like his board is working OK,
> but could possibly be a bit better. If he were communicating
> exclusively on the serial port and the PPS were not working, would he be
> getting performance this good?
As has been written here many time before - serial NMEA alone is likely to
about as good as Internet sources (if that) and perhaps three orders or
magnitude worse than a serial port PPS/DCD connection. Milliseconds, not
> However, the manual for the Trimble Resolution T recommends GPZDA for
Strange they do that as that sentence has no information about whether the
GPS data is valid or whether the GPS is locked. Until I hear a good
reason otherwise, that seems to me to be the /worst possible/ single NMEA
sentence to use!
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