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

From: Martin Boissonneault
Subject: Re: ntpviz showing odd repeating offset for SHM(0) from gpsd
Date: Fri, 8 May 2020 11:23:39 -0400

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.

Otherwise, it's normal.


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
> weekly view
> 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/ -n  /dev/gpsd0
> 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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