[gpsd-dev] refclock 28 gone wacky on me

Gary E. Miller gem at rellim.com
Sun Jun 19 22:14:58 UTC 2016

Yo Mike!

On Sun, 19 Jun 2016 17:46:48 -0400
Mike <bellyacres at gmail.com> wrote:

> > What do your other chimers in 'ntpq -p show'?  Youu still have not
> > confirmmed which PPS edge you are on.  The leading or trailing.

> I'll likely put an arrow through this module before I'm able to get a 
> scope hooked up too it!  So leading or trailing is a coin toss at
> this point.
Which is why I asked what your other chimers say.  If you have
a chimer without 30 milliSec of you that is usuually good enough to 
check your edge.

> At that point
> NMEA deliver was really late, as in > .940 that I was seeing
> earlier.

To disabiguate 'late' I assume you mean the NMEA timestamp fractional
seconds is for later in tthe second, not zero.

>  I wasn't real pleased and figured I'd have to reset the
> setting to get the NMEA delivery back to top of second.  Left is
> alone for several hours, come back and gpsmon shows that I was back
> to getting delivery close to the top of second again.

Yes, that is expected.  You need to tetll the Skytrazzq to force the
top of the second, and save to flash.

> At that point PPS looks good, NMEA is way out, where before I had 
> powered the module down is was looking pretty good.

I'm not sure what you mean by 'way out'.

>  I'll probably
> have to pull that info from the statistics if it's really relevant. I
> get that I can fudge out the difference shown above.  One shouldn't
> have to do that every time something is powered off though.

You should be within +/- 150 milliSec if you start with the right
fudge.  The NMEA not being at the top of the second should not
affect that at all.

> I believe that the ntpshmmon output was showing that PPS is picking
> up the first seen and NMEA is picking up the second.

Your ntpshmmon it misleading you.  It is corrypted by a bug, that is
now fixed.  Rerun with the ntpshmmon which is now in git hear.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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