[time-nuts] NTP, PPS and < 10 us offsets

Miguel Barbosa Gonçalves m at mbg.pt
Thu May 16 06:12:31 EDT 2013

On 16 May 2013 04:14, Chris Albertson <albertson.chris at gmail.com> wrote:

> On Wed, May 15, 2013 at 12:43 PM, Miguel Barbosa Gonçalves <m at mbg.pt>
> wrote:
> >
> > I've reconfigured the antenna to output only NMEA sentences (and I also
> use
> > the PPS) and NTP works fine but suddenly without any explanation the NTP
> > process stops receiving information from the receiver. I really don't
> > understand what's happening here as the receiver is on the roof and sees
> > plenty of satellites:
> Even if there were zero satellites the GPS receiver should report zero, not
> just stop and die.
> Are you certain that both PPS and NMEA data both stop?  If just one of
> them, then I'd suspect a bad connection, a loose cable or something.   If
> both then I'd suspect the receiver or its power supply or the rs422 to
> rs232 converter or its power supply.  Power is the easiest thing to check.

Hi Chris!

Thanks for your help. The strange thing is that is works and suddenly it

I changed the offset of the NMEA data in NTP and increased the mindist to
It is running since 21:12 UTC without problems. I will let it run for 48
hours before
entering production.

Kind regards,

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