I have a 4000 GPB ($6000 ?) GPS time source - it works beautifully. I then took a $200 etrex hand-held GPS, set it to NMEA mode, plugged in into a serial port on a Linux machine, I then did ln -fs /dev/ttyS0 /dev/gps0 and configured ntp.conf
server 127.127.1.0 fudge 127.127.1.0 stratum 10 server 127.127.20.0 I started ntpd and then my linux platform appears as a stratum 1 server. However, it seems to have an approx 300mS offset from the 4000 GBP GPS time source. I tried fudge 127.127.20.0 time1 0.3 or fudge 127.127.20.0 time1 -0.3 or even fudge 127.127.20.0 time1 500.0 (+ restarting ntpd each time) But it seemed to make no difference to the time served from linux Any idea 1. Why the offset 2. How to adjust for it - so I can make a cheap linux/Etrex GPS stratum 1 server DJ _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
