[ntp:questions] Second attempt at GPS-18 based NTP server

Duncan, Paul A. pdu at noc.ac.uk
Fri Feb 10 14:23:38 UTC 2012

Hello Again,

Okay, everyone has said I definitely need to use a custom kernel, and I have now done that, and ntpdc -c kern now reports the following:

pll offset:           -1.091e-06 s
pll frequency:        -3.196 ppm
maximum error:        0.019912 s
estimated error:      1e-06 s
status:               2107  pll ppsfreq ppstime ppssignal nano
pll time constant:    7
precision:            1e-09 s
frequency tolerance:  496 ppm
pps frequency:        -3.196 ppm
pps stability:        0.022 ppm
pps jitter:           1.261e-06 s
calibration interval: 128 s
calibration cycles:   797
jitter exceeded:      522
stability exceeded:   0
calibration errors:   5

Which looks fairly reasonable, as the status line is talking about ppstime and ppssignal. Not sure about 5 calibration errors...

But then I look at ntpq -p and it says this:

     remote           refid      st t when poll reach   delay   offset  jitter
+server1.terrybu    2 u   70  128  377    6.356   -0.122  13.187
-     2 u   70  128  377    5.441   -0.582  13.929
+gamma.h3x.no  3 u    1  128  377    6.066   -0.228   0.660
*GPS_NMEA(0)     .PPS.            0 l    2   64  377    0.000   -0.001   0.001

I'm fairly sure that there should be a lower case "o" to the left of GPS_NMEA, and there is not.

Am I right to be worried?

Thanks again!

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