[ntp:questions] help with setting up NTP on windows with a USB GPS

jack j.jack.wang at gmail.com
Thu Nov 26 21:30:42 UTC 2009


I only have the following in the configure file:

server minpoll 4 prefer

I found the following entry in the log file:

Using user-mode PPS timestamp

Does it mean NTP reads the GPS strings and sees the 1PPS signal?

All the values are still 0 including reach. At one point for about 10
minutes, I saw some values after rebooting the machine but they
disappeared quickly.



ps: I am using the latest NTP from Dave Hart's website. I also
installed serialpps.sys.

On Nov 26, 2:52 pm, "David J Taylor" <david-tay... at blueyonder.not-this-
bit.nor-this-part.co.uk.invalid> wrote:
> "jack" <> wrote in message
> news:7a8980f8-5cbc-4100-9d84-2d5e2a93c2de at e27g2000yqd.googlegroups.com...
> > David,
> > I switched to a machine with an RS232 port and also found version
> > 4.2.5. NTP now opens port COM1 with no problem. However, status shows
> > that it doesn't seem to be reading from GPS since all values (jitter,
> > offset etc) are 0. Any suggestions?
> > Jack
> I've only tested with a PPS line connected to the DCD port.  Do you have
> that?  Is the reach value showing 0 as well?  I can't recall now what baud
> rate you need - 4800 by default, perhaps?
> Cheers,
> David

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