[ntp:questions] NMEA refclock questions: baud-rate and PPS
David J Taylor
david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk.invalid
Sat Jan 28 14:56:44 UTC 2006
Folks, I'm thinking of adding my new Garmin GPS 18 LVC just to see how
well it might function with serial input alone, so I have some questions.
With the NMEA refclock driver (type 20):
- is it possible to select the baud rate without re-compiling or must it
be 4800? I would have thought that having the higher baud rate might
perhaps improve jitter.
- is a PPS signal actually required, or will the driver function with just
the serial input (I realise that accuracy will be much worse without the
PPS, but his is just for testing).
- is it possible to use NTP just to observe a refclock, without actually
syncing time with it?
More information about the questions