Re: [gpsd-users] Ublox EVK-M8T

[Gary E. Miller]

Yo Denny!

On Thu, 21 Sep 2017 16:03:30 -0700
Denny Page <address@hidden> wrote:

> I’m embarrassed to confess that no longer own a scope. Last time I
> did was around 30 years ago. I understand that they’ve changed a
> bit. :)

I still have my Tek 465B.

> Sorry I wasn’t more clear previously. The problem was that the PPS
> was actually incorrect, off by 100ms. This caused chrony to reject
> the PPS, either via kernel pps or via socket from gpsd.

Did you try NTPsec?  Then you can apply an offset.  And how does it
even know which 100 milli sec unless it has PPS time?

> The core issues is that in the default configuration on the EVK-M8T,
> the RS-232 signal is inverted on the PPS line.

gpsd does not care.  gpsd senses the leading and trailing edges, then
uses JUST the leading edge.

Try running gpsd, then get the output of ntpshmmon.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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