[ntp:questions] PPS indication in ntpq

Miguel Gonçalves mail at miguelgoncalves.com
Tue Aug 2 22:20:17 UTC 2011


Thank you so much for your help!

I figured I was using different versions of NTP:

- 4.2.4p5 (FreeBSD 7.4) on the one that was not seeing the PPS: I was
only using the NMEA driver and I should have also added the PPS

- 4.2.6p2 (FreeBSD 7.4 but compiled through ports) on the one that was
seeing the PPS: I had to use 4.2.6p2 so I could select 9600 bps.

Through a series of mistakes I found out (with your help) that ntpq
should report 'o' instead of '*'. So the correct one was the 4.2.6p2
one! :-)

The final configuration is this (I am posting so everyone can see it
in the future):

--- Garmin 18 LVC (NTP 4.2.4p5) ---
server minpoll 4
fudge flag3 1

server mode 2 prefer minpoll 4 iburst
fudge flag2 0 flag3 1
--- END ---

--- Sure GPS Board (amazing board with NTP 4.2.6p2) ---
server mode 18 prefer minpoll 4
fudge flag1 1 flag2 0 flag3 1 time2 0.400
--- END ---

By the way, I could only the Sure board to work by adding the time2
fudge. It seems OK to me... What do you think?

Thanks again!


On 2 August 2011 23:07, Harlan Stenn <stenn at ntp.org> wrote:
>> > I believe so, yes. =A0Does the other one ever switch to 'o'?
>> Unfortunatelly, no. But it should right? I don't know which system to
>> fix... :-(
> I'd recommend trying to find out why that one system is not seeing the
> PPS signal.
> Have you tried switching the cables to the GPSes so they are plugged in
> to the "other" machine?  If the problem follows the GPS, then they are
> configured differently.  Otherwise it is a difference on the machines.
> H

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