[ntp:questions] using both a PPS source and a HBG (dcf-77-like) timesource?

Folkert van Heusden folkert at vanheusden.com
Mon Jan 14 20:35:31 UTC 2008


> >Ok but the odd thing is: a friend of mine has the exact same garmin 18
> >lvc but not this big offset?
> 
> Your PPS isn't working.  That could be either hardware or software.
> What OS are you using?  What version of ntpd?
> What is your friend using?

linux, 2.6.23 with the PPS patch
ntp-4.2.4p4+dfsg

> How about taking your unit over to his place and seeing if your
> GPS hardware works with his software?

Well the funny thing is, I had forgotten to apply a certain patch which
makes the pps part of the nmea driver work with the linux pps
implementation. Now the statistics are slightly different:

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+GPS_NMEA(0)     .GPS.            0 l    6   16  377    0.000    0.318   0.046  <---
oPPS(0)          .PPS.            0 l    2   16  377    0.000    0.315   0.048  <---
-muur.intranet.v .DCFa.           1 u   36   64  377    0.068   -7.474   0.237
xthegateap.intra .SHM.            1 u   20   64  377    0.914  -23.408   0.645
 SHM(0)          .SHM0.           2 l    -   64    0    0.000    0.000   0.001
 SHM(1)          .SHM1.           2 l    -   64    0    0.000    0.000   0.001
 SHM(2)          .SHM2.           2 l    -   64    0    0.000    0.000   0.001
 SHM(3)          .SHM3.           2 l    -   64    0    0.000    0.000   0.001
 NTP.MCAST.NET   .MCST.          16 u    -   64    0    0.000    0.000   0.001
 192.168.64.0    .BCST.          16 u    -   64    0    0.000    0.000   0.001
-auth1.xs4all.nl 193.79.237.14    2 u   28   64  377    8.190    2.095   0.395
-auth2.xs4all.nl 193.67.79.202    2 u   24   64  377    8.270   -0.789   0.565
-ntp1.nl.uu.net  .GPS.            1 u   25   64  377   16.372    1.816   4.882
+chime2.surfnet. .GPS.            1 u   22   64  377   12.467    0.792   0.668
-ntp.networking4 193.190.230.65   2 u   26   64  377    8.980    0.176   0.488
xcolo.farenji.ne 80.127.4.179     2 u   25   64  377   12.830    6.598   0.781
-eu.ntp.your.org 216.218.254.202  2 u   24   64  377    8.420   -1.383   0.266


Folkert van Heusden

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