Check the Arbiter for anomalous "Cable Delay" or "Clock Offset" settings.
Maybe they accidentally got set to 9999999ns instead of zero.

Page 38 in this manual:
http://www.arbiter.com/files/product-attachments/1084_manual.pdf

Tim N3QE

On Fri, Oct 14, 2016 at 8:31 PM, gmx tallahassee <gmx.tallahas...@gmail.com>
wrote:

> 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.
>
> Details:
>
> 172.17.21.11 is approx 400M away through two Cisco 3750G switches no
> routing.
> 172.17.21.12 is in the same rack as the leoNTP unit and plugged into the
> same 3750G switch
>
> Antenna location for the .12 arbiter and the leontp is on the same rung of
> the same tower.  Tower has clear horizon to horizon view.  cable runs are
> the same (obviously).
>
> I did run with the included puck in my south facing office window (rather
> than the GPS antenna on the tower) for a couple of days when I first got
> the unit.  The offset behaviour was the same.
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