[ntp:questions] How to debug GPS PPS?

xyz-2041 xyz2041 at gmail.com
Fri Feb 12 19:37:10 UTC 2010

OK.  Couldn't get the Oncore unit to work in any way
shape or form.  I bought a DB9 LED tester like this:


Had PPS going to pin 1, DATA OUT to pin 2, and DATA IN to pin 3.
no good.

Bought a Garmin GPS 25-LVC, put it in an enclosure, commented
out the Oncore driver and added to ntp.conf:

  # Garmin / PPS driver:
  server   prefer
  fudge   refid GPS


  /etc/rc.d/ntpd restart

Checking the status:

  # ntpq -c pe

       remote           refid      st t when poll reach   delay
offset  jitter
  xGPS_NMEA(0)     .GPS.            0 l   15   64  377    0.000
-716.52 105.934

Looks like it is being read, but is off by quite a bit.  Any ideas on
to get it to behave?

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