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Re: ntpviz showing odd repeating offset for SHM(0) from gpsd


From: shouldbe q931
Subject: Re: ntpviz showing odd repeating offset for SHM(0) from gpsd
Date: Fri, 8 May 2020 22:41:18 +0100

Hi Martin,

On Fri, May 8, 2020 at 4:23 PM Martin Boissonneault
<address@hidden> wrote:
>
> Hi Arne,
>
> My U-blox MAX-M8Q does the same. The message timing has that varying offset, 
> but it has no real consequences as SHM1 is the one that carries the PPS. I 
> would, however, recommend you apply an offset to keep the delay positive or 
> it could mess the decoding.
>

Yes, I'm quite aware that it isn't an "issue" (-:


> Otherwise, it's normal.

I have a "few" uBlox receivers (including a MAX-M8Q on an Uputonics
"hat") , and I have not seen this on any of the others, none of the
other gpsd installs were on the same (exact) version.

I've updated to git head, and the "flip flop" offset no longer appears
to be happening.

Cheers

Arne

>
> Martin
>
> Martin Boissonneault
> Sent from my phone
>
> > On May 8, 2020, at 07:00, shouldbe q931 <address@hidden> wrote:
> >
> > ´╗┐As a picture is allegedly worth a thousand words, I've included two 
> > pictures
> >
> > daily view
> > https://pasteboard.co/J7p9VU5.png
> >
> > weekly view
> > https://pasteboard.co/J7paicZ.png
> >
> > As none of the other server offsets show this, I have presumed that
> > the repeating offset is not happening on the ntpsec side.
> >
> > gpsd: 3.19-dev (revision 3.19-dev-2019-04-22T13:57:37.400598)
> > ntpd ntpsec-1.1.3+ 2019-04-22T13:02:45Z (git rev 5b9324c)
> >
> > Running in a rPi raspbian stretch
> > 4.19.66-v7+ #1253 SMP Thu Aug 15 11:49:46 BST 2019 armv7l GNU/Linux
> >
> > gpsd is started with
> > /usr/local/sbin/gpsd -P /var/run/gpsd.pid -n  /dev/gpsd0
> >
> > UBX-MON-VER:
> > swVersion 1.00 (59842)
> > hwVersion 00070000
> > extension: PROTVER 14.00
> > extension: GPS;SBAS;GLO;QZSS
> >
> > Although the rPi also runs dump109-fa (an ADS-B receiver), I'm fairly
> > sure that this is not related.
> >
> > Cheers
> >
> > Arne
> >



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