Chris Richmond - MD6-FDC ~ wrote: > In article <[EMAIL PROTECTED]>, > "David J Taylor" > <[EMAIL PROTECTED]> writes: >> I use both - serial for time and PPS for precision. If you only use >> PPS, how are you going to know the time? > > David, why is one set up as a fudge verses both being servers > in your config? > > Chris
Extract from my config: # The GPS receiver on COM1 at 4800 baud # # mode 1 = use $GPRMC statements # time1 = trimming offset # flag3 1 = enable Kernel PPS discipline # server 127.127.20.1 mode 1 prefer fudge 127.127.20.1 time1 0.000 flag3 1 refid PPS # The fudge command allows me to adjust certain parameters of the specified server. In this case, I alter: - the reference ID to the string "PPS" - flag 3 to the value 1, enabling the kernel PPS discipline - the time offset to 0 The latter adjustment does nothing, but had my pulses been the opposite polarity to the ones I actually have, the NTP software might have locked to the trailing edge of the pulse 200ms after the leading edge, and rather than change that in hardware I could have set time1 to +0.200 (or whatever) to get the correct time. Does that help? I'll add it to the Web page. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
