Re: [gpsd-dev] A detail in your ntpoffset script

[Gary E. Miller]

Yo Beat!

On Wed, 23 Oct 2013 00:33:34 +0200
Beat Bolli <address@hidden> wrote:

> > This seems to imply that the PPS unit is .1 rather than .0.
> > 
> This is correct, but I was assuming that the PPS doesn't have to be
> fudged, because it is directly connected to the kernel PPS via an
> interrupt.

There is an offset, but likely WAY smaller than can be measured off network
chimers.

> I have a fudge offset only on the GPS unit, and none on the
> PPS. This seems to make sense to me, because only the NMEA stuff is
> delayed by the RS232 transmission.

Hard core folks will have several PPS sources on the host.  Then adjust
the fudge to make them all agree.  I have seen several uSec offset
between brands of serial PPS.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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