[time-nuts] A new time nut - and a question!

Christopher Glass tribaal at gmail.com
Thu Oct 1 12:44:02 EDT 2015

Hi David,

Thanks for the pointer - but the driver I am using is type 20 (NMEA),
so that flag1 is documented as enabling/disabling of PPS signal
processing instead.

After some time, the output of "ntpq -c pe -c as -c rl" seemed to
stabilize as [1]. The GPS reference seems to be used correctly (as
show by the leading "o" in ntpq -c pe" output.

However I still don't understand the "reftime/clock" difference, and
it seems the two dates are drifting from each other rather than
converging, which is unexpected (to me, as a newbie).
The frequency field keeps changing, so should I understand that the
frequency field is adjusted automatically until the times are in sync?

[1]: http://pastebin.ubuntu.com/12632650/

On Thu, Oct 1, 2015 at 6:02 PM, David J Taylor
<david-taylor at blueyonder.co.uk> wrote:
> Hi list,
> I recently got time to build my first stratum-1 GPS timeserver around
> a raspberry-pi (first model) and one of these [1].
> I would ideally like to have it work as a completely standalone time
> source, only getting timing information from the GPS signal it is
> receiving (no network peers). As such, I built ntpd with --with-NMEA,
> and tweaked things around to the point where I *think* I got it
> working, however, my simple question is:
> []
> Thanks for your time
> - Chris
> ===================================
> Chris,
> I used no special build on NTP.  I've been asked the same question, and put
> some notes sent in by users on my Web site:
>  http://www.satsignal.eu/ntp/Raspberry-Pi-quickstart.html#stand-alone
> Perhaps there's something there?
> Cheers,
> David
> --
> SatSignal Software - Quality software written to your requirements
> Web: http://www.satsignal.eu
> Email: david-taylor at blueyonder.co.uk
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