Richard Cagley wrote:
hmm, timeX is just a calibration factor so I don't think adding it will fix
my pps breakage. But, I do think it's important and I'm not using it.
So, question to you, I have a U-Blox NEO-6P module. How would I go about
determining the time1/time2 values for the 127.127.20.0 server? The key
words "offset" and "calibration" don't show up here
http://www.u-blox.com/images/downloads/Product_Docs/NEO-6_DataSheet_%28GPS.G6-HW-09005%29.pdf
I initially used "noselect" for 127.127.20.n and had one
of my other servers marked as "prefer"
I also have "tos mindist 0.4"
From peer_summary over several days I selected the mean
to use for time2.
Peer_summary for nmea over past 20 days shows wide spreads
of values: mean = -3 to 12, rms = 16 to 22, max = 63 to 88
The type 20 nmea driver can be used alone without problem
but I had been comparing pps to parallel vs serial inputs
(and did not find any significant difference).
David
On Sat, Jun 15, 2013 at 8:54 AM, David Lord <[email protected]> wrote:
Richard Cagley wrote:
I have a TI DM8168 processor and a u-blox gps.
If I enable an internet server and pps, then pps works great
server clock.redhat.com iburst prefer minpoll 4 maxpoll 4
server 127.127.22.0 minpoll 4 maxpoll 4
fudge 127.127.22.0 flag3 1
However, if I add an NMEA server to my ntp.conf file like this
server 127.127.20.0 mode 1
fudge 127.127.20.0 flag1 1
server 127.127.22.0 minpoll 4 maxpoll 4
fudge 127.127.22.0 flag3 1
then pps stops working. I can kill ntpd and ppstest no longer works. It's
as though nmea is clobbering the serial port.
It sorta feels like this, but there was no resolution
http://lists.ntp.org/**pipermail/questions/2011-**September/030347.html<http://lists.ntp.org/pipermail/questions/2011-September/030347.html>
Can anyone help me. I've really been struggling with this.
I'm using NetBSD-6.1 ntpd 4.2.6p5 but have also had pps + nmea
working on ubuntu.
You probably need to determine then add time2 0.xyz sec to
your config. The time2 value is for your particular gps and
gps firmware version.
For my "Sure" gps I have:
server 127.127.20.2 mode 18 prefer
fudge 127.127.20.2 stratum 4 time2 0.417 flag1 0 refid GPSb
server 127.127.22.2
fudge 127.127.22.2 flag2 0 flag3 1 refid PPSb
From peer summary I have:
127.127.22.2 mean=0.000 rms=0.004 max=0.038
The 0.038 is mostly due to load from two cron jobs each evening.
David
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