[time-nuts] NIST UT1 NTP server results

John Hawkinson jhawk at MIT.EDU
Fri Jul 22 18:23:07 EDT 2016

I have to wonder if it's really such a great idea to have this
as an open NTP server without huge red flags that it is not UTC.
One could imagine it leading to big problems if some people started
syncing to it without undersatnding that it was.

Has there been thought to at least setting the reference ID to 'UT1'
instead of 'NIST' (or maybe 'NUT1' since 'NIST-UT1' is too long?).

With respect to interpolation and soforth, it seems like a lot of NTP
cares more about frequency than offset, and all this stepping presumably
wreaks havoc with the frequency? Maybe I'm wrong though...

--jhawk at mit.edu
  John Hawkinson

Tom Van Baak <tvb at LeapSecond.com> wrote on Fri, 22 Jul 2016
at 15:14:26 -0700 in <60BA6696E49A4C4FA9F6B5792176F81A at pc52>:

> >       The current algorithm on the server uses the UT1 offset from
> > Circular A with no interpolation. The value changes at 0 UTC every day.
> > I did not use any interpolation because the difference in the dUT1
> > value  from one day to the next is on the order of 1-2 ms, and I
> > considered that it was likely that the jitter and asymmetry of the
> > network connection to a typical user would limit the accuracy to a
> > larger value anyway so that interpolation would not actually improve
> > anything. However, I will certainly consider changing this. It would not
> > be a big deal to add interpolation if there were some good reason for
> > doing so.
> >
> > Best wishes,
> >
> > Judah Levine

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