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

From: Gary E. Miller
Subject: Re: [gpsd-dev] A detail in your ntpoffset script
Date: Wed, 23 Oct 2013 13:14:56 -0700

Yo Dave!

On Wed, 23 Oct 2013 13:09:06 -0700
Dave Platt <address@hidden> wrote:

> > I see where you are going.  But I have gottent tow PPS to agree to
> > better than 1 uSec so I do not think it is a measurement error on
> > my part.
> > 
> > The error is attached to the GPS, not to the port or host I conenct
> > it to.  So it is a characteristic of the GPS, not the measurement 
> > techniwue.
> It would be interesting to measure the electrical offset by a separate
> technique which is completely independent of the host interface
> timing.

Been there, do that with my trusty Tek scope.  1.5 uSec.

> Won't work with USB-output-only GPS'es, of course.

Of course.  3 orders of magnitude difference.

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

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