Hi Ok, so now what we need are at least 5 other public UT1 NTP servers so you can properly synch up to a set of them.
Bob > On Jul 23, 2016, at 8:47 AM, Mike Cook <michael.c...@sfr.fr> wrote: > > As I suspected NTP client handles the UT1 data ok if there is just that > server configured. > The only issue is that the current UT1 stream has steps at 0h which NTP takes > time to sync to if slewing is enabled. About 2000s in fact. The step size is > far less than the max offset allowed and so doesn’t provoke a step. > > I don’t have too many data points but attach here a plot of the 0h transition > last night. > Note that the the x-axis has the seconds scaled as a percentage of the number > of secs in a day as I couldn’t figure out how to do it otherwise. > > > > > > Have a good weekend, > Mike > > >> Le 23 juil. 2016 à 01:21, Mike Cook <michael.c...@sfr.fr> a écrit : >> >> >>> Le 23 juil. 2016 à 00:23, John Hawkinson <jh...@mit.edu> a écrit : >>> >>> 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. >> >> I think that it would get rejected as a falseticker in most circumstances. >> Worth looking at. >> >> I have just started an NTP client with just that server as a source.. The >> GPS based source is configured noselect. >> >> Sat Jul 23 01:00:27 CEST 2016 >> remote refid st t when poll reach delay offset jitter >> ============================================================================== >> 192.168.1.23 .GPS. 1 u 15 16 377 0.837 70.330 39.176 >> 128.138.140.50 .NIST. 1 u 12 16 377 130.662 -153.05 35.809 >> Sat Jul 23 01:01:31 CEST 2016 >> remote refid st t when poll reach delay offset jitter >> ============================================================================== >> 192.168.1.23 .GPS. 1 u 7 16 377 0.825 106.345 40.264 >> 128.138.140.50 .NIST. 1 u 12 16 377 130.652 -121.03 35.812 >> >> The system clock offset is slowly converging on the UT1 server. >> >> more later. >> >>> >>> 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?). >>> >> I would prefer UT1 >>> >>> 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... >>> >>> --jh...@mit.edu >>> John Hawkinson >>> >>> Tom Van Baak <t...@leapsecond.com> wrote on Fri, 22 Jul 2016 >>> at 15:14:26 -0700 in <60BA6696E49A4C4FA9F6B5792176F81A@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 >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> "The power of accurate observation is commonly called cynicism by those who >> have not got it. » >> George Bernard Shaw >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > "The power of accurate observation is commonly called cynicism by those who > have not got it. » > George Bernard Shaw > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
