[gpsd-dev] refclock 28 gone wacky on me

[Gary E. Miller]

Yo Mike!

`

On Sun, 19 Jun 2016 15:59:16 -0400
Mike <bellyacres at gmail.com> wrote:

> On 06/10/2016 03:17 PM, Gary E. Miller wrote:
> > Yo Eric!
> >
> > On Fri, 10 Jun 2016 03:49:22 -0400
> > "Eric S. Raymond" <esr at thyrsus.com> wrote:
> >  
> >> That's... very weird.  I've never seen it happen.  
> > But it would explain some old complaints.
> >
> > Now that we know which Skytraq option it is, I recall always
> > selecting the workaround.
> >  
> >> It sounds as though for some crazy reason the GPS is delivering the
> >> PPS pulse late.  
> > Not late, as such.  Late in the second, but the time stamp of the
> > fix (xxX.940) is pretty close to when actually sent.
> >  
> >> I'm hard put to imagine how gpsmon could screw this up.  
> > Or Hal with his O-scope.
> >
> > RGDS
> > GARY  
> I'm seeing this happen now, PPS is good NMEA is off nearly half a 
> sec...  NMEA delivery viewed in gpsmon is 0.011 after top of second.
> 
> *SHM(1)          .PPS.            0 l   10   16  377    0.000 -0.002   0.004 
> -SHM(0)          .GPS.            0 l    9   16 377    0.000 -496.59 6.661

Looking good.  Now add a 0.500 fudge to your ntp.conf.  Like this:

    server 127.127.28.0
    fudge 127.127.28.0 time1 0.500  refid GPS

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

RGDS
GARY
---------------------------------------------------------------------------
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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