I built one of these a while back, works very well. Current status: associd=0 status=011b leap_none, sync_pps, 1 event, leap_event, version="ntpd 4.2.

I built one of these a while back, works very well. Current status: associd=0 status=011b leap_none, sync_pps, 1 event, leap_event, version="ntpd 4.2.7p481@1.2483 Tue Nov 25 05:07:16 UTC 2014 (2)", processor="armv6l", system="Linux/4.1.13+", leap=00, stratum=1, precision=-18, rootdelay=0.000, rootdisp=1.180, refid=kPPS, reftime=db8dafdb.d2b0f5b9 Thu, Sep 22 2016 1:18:19.823, clock=db8dafe8.c014ef24 Thu, Sep 22 2016 1:18:32.750, peer=42535, tc=4, mintc=3, offset=-0.000614, frequency=-44.146, sys_jitter=0.003815, clk_jitter=0.004, clk_wander=0.000 I believe that the jitter values are in milliseconds.