Hi all,

I'm checking out the leontp ntp time server (leontp.com).  After a week of
use I am getting the following ntp -q output:

$ ntpq -pn
    remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
*172.17.21.11    .GPS.            1 u   13   16  377    0.137    0.077
0.054             <- Arbiter 1084C GPS Clock
+172.17.21.12    .GPS.            1 u   11   16  377    0.101    0.085
0.174             <- Arbiter 1084C GPS Clock
x172.17.21.233   .GPS.            1 u   11   16  377    0.071    9.760
0.061            <- LeoNTP

the offset of the leontp device from the other clocks has consistently been
in the 9.5 -10.5 range.  since I'm measuring all three sources  from the
same (EL7) computer, I would expect that the offset of the leontp unit to
converge to be in the close neighborhood of the offsets of the arbiters.
It has not converged, instead maintaining the ~10ms offset.

Thoughts?

Thanks.
_______________________________________________


Briefly,

Here is an Intel Atom Linux NTP server fed from a Garmin GPS 18 LVC compared against some other devices, where 192.168.0.20 is a LeoNTP:

remote refid st t when poll reach delay offset jitter
==============================================================================
o127.127.22.0 .kPPS. 0 l 5 16 377 0.000 0.000 0.003 *127.127.28.0 .GPSD. 0 l 6 16 377 0.000 -3.598 0.662 192.168.0.83 .kPPS. 1 u 2 32 377 0.251 0.006 0.017 192.168.0.20 .GPS. 1 u 16 32 377 0.087 0.028 0.002 +192.168.0.1 .kPPS. 1 u 4 32 377 0.161 -0.119 0.022 +192.168.0.7 .kPPS. 1 u 18 32 377 0.196 -0.043 0.027 +192.168.0.8 .kPPS. 1 u 2 32 377 0.160 -0.018 0.139

There's no 10 ms offset. Other devices are: .83 a Raspberry Pi, .1, .7 .8 Windows kernel-mode PPS synced server. I would suggest checking your Arbiter servers.

Can you check with a 'scope to compare the PPS out out the LeoNTP? It's a 100 ms positive pulse, within about 50 ns of a couple of other GPS/PPS devices, and about 200 ns earlier than a Jackson Labs device.

Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
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