[time-nuts] PPS offset between GPS receivers

Chris Albertson albertson.chris at gmail.com
Sat Dec 8 02:19:58 UTC 2012

One more test to try.  Connect one PPS signal to both GPIO ports and see
how close to zero offset you get.   It would likely be random which gets
read first.

On Wed, Dec 5, 2012 at 5:37 AM, Gabs Ricalde <gsricalde at gmail.com> wrote:

> Hi everyone,
> As Tom suggested, I redid the test with less than 1 ft. of wire from the
> PPS output to the GPIO without any logic gates or line receivers. Same
> result,
> the SKG25A1 was 2 microseconds ahead of the 58534A. Without any other way
> of
> testing, I would probably trust the output of the timing receiver more
> than the SkyNav module. Anyway the SkyNav board is an inexpensive unit and
> I wouldn't mind setting an offset in ntpd.
> I don't have a scope yet, and a low jitter PPS GPIO is the closest thing I
> have
> to a TIC.
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Chris Albertson
Redondo Beach, California

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