[ntp:questions] NMEA ref.clock better than my ISP's timeserver?

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Wed May 27 19:43:03 UTC 2009


pisteoff at start.no wrote:
> After first trying the Haicom HI-204III claiming to have PPS in the
> manual without really having it, I bought a Garmin 18x LVC and
> connected it to the onboard COM-port (COM1) on my Asus M3N78 PRO

Very good!

(Using USB power I assume?)

> mainboard. The Haicom is residing on a USB serial adapter (COM6) to
> check how stable the offset is.
> 
> Running ntp4.2.5p175-win-x86-bin configured with a couple of

Windows...

> timesources it seems like my ISP's NTP-server gets "disqualified".
> Before setting up my own ref.clock I used to have ntp.online.no as my
> "favorite NTP-server" thinking it would be the best / most local
> server, but now I might offer them to use me as a clock-source? ;)
> 
> Anyone wishing to see on their own, might check with ntpq
> solbakken.dyndns.org   What kind of accuracy is expectable with a NMEA
> GPS with PPS connected to the DCD-line of the serial port? It's not
> that I have any special need for extreme accuracy, but I suppose it's
> allright having the most accurate clock in the neighborhood. :)

Hei, hei!

If your neighborhood is Oslo, I probably have you beat, with 6-8 
GPS-quality PPS sources, including 5 Oncore timing receivers, all 
connected to FreeBSD servers with PPS support. :-)

Terje
-- 
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"




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