[ntp:questions] Another happy "Sure" GPS user

David Lord snews at lordynet.org
Fri May 13 23:04:24 UTC 2011


Another happy "Sure" GPS user

Board modified with two wire links to give PPS at rs232 levels
to DCD of serial port.

See http://www.satsignal.eu/ntp/Sure-GPS.htm for details of
mods by David Taylor.


NetBSD-5
ntp-dev-4.2.7p98
kernel mode PPS (PPS wasn't converging using default flag3 0).

Ntpq -p after about 90 minutes:

      remote       refid  st t when poll reach   delay   offset  jitter
======================================================================
*GPS_NMEA(2)     .GPSb.   0 l   36   64  377    0.000    9.748  13.468
xPPS(2)          .PPSb.   0 l    3   16  377    0.000   -0.003   0.004
  local_peer               2 s   41   64  376    1.044    1.197   0.343
+local_server_1           2 u   21   64  377    0.728    1.076   0.497
+local_server_2           2 u   14   64  377    0.553    2.027   0.530
-remote_1                 2 u  436  512  377   25.850    3.352   3.948
-remote_2                 2 u  429  512  377   20.857    2.141   0.610




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