My Sure Electronics GPS finally arrived a few days ago, and I'm having some trouble getting it stabilized. I'm running Windows 7 x64, with the latest serialpps.sys driver (20110720), NTP 4.2.6p3 compiled on the same machine. I also compiled and ran the code from an email chain back in April to reprogram the module to only send $GPGGA - which it does. It's set to 115200bps now, although it didn't appear to have any effect on jitter/offset from 9600, 19200, 38400, and 115200 that I can tell. I've turned off UART buffers to the COM port. I haven't soldered a wire to get PPS to the serial port yet, but I plan to once I get it stabilized.
ntp.conf: driftfile "C:\Program Files (x86)\NTP\etc\ntp.drift" server 127.127.1.0 fudge 127.127.1.0 stratum 12 server 127.127.20.1 mode 82 minpoll 4 prefer server 127.127.22.1 minpoll 4 server 0.us.pool.ntp.org iburst server 1.us.pool.ntp.org iburst server 2.us.pool.ntp.org iburst server 3.us.pool.ntp.org iburst server ntp.numberzero.org iburst peer 192.168.1.3 iburst peer 192.168.1.4 iburst enable stats statsdir "C:\Program Files (x86)\NTP\etc\" statistics loopstats The problem is the offset for the Sure GPS consistently varies between -250ms and -350ms, and the jitter roughly between 5ms and 35ms. Obviously, ntpd rejects it and picks something from the pool instead. Any ideas why it could be so unstable/inaccurate? I must be forgetting something obvious. Here is my ntpq -p: http://i.imgur.com/gNURx.png Thanks in advance! _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
