"Richard B. gilbert" <[EMAIL PROTECTED]> wrote in news:[EMAIL PROTECTED]:
> Danny Mayer wrote: >> PeterW wrote: >> >>>The UK MSF time-standard transmitter moved from near Rugby in >>>Warwickshire to Anthorn in Cumbria at the beginning of April. For >>>those with MSF reference clocks, this will make a difference of at >>>worst case +/- 1msec depending on how distance from the transmitter >>>changes. >>> >>>I assume (hope) that most Stratum 1 clocks have been adjusted, but >>>some may no have been, so check an MSF-based clock against GPS or >>>DCF77a before relying on it. >>> >> >> >> Peter, >> >> Do you have any reason to think that it is less reliable or accurate >> than the old site? >> >> Danny > > > I think he means that the propagation delays have changed because of > the > move and that there may be problems with servers that have not made > the necessary adjustments. I'm inclined to suspect that he's right > and that many servers have failed to note the change and make the > necessary adjustments. > > OTOH, I can think of MAYBE ONE server that I can rely on for time > accurate to within a millisecond. They all may have time accurate to > the microsecond but the problem is getting delivery over the network. > > > It is the propagation delay I am talking of. It is just over 1 ms (in old money, 186 miles = 1 ms and the new site is about 200 miles away). The site is still locked to the NPL clocks in Teddington. I had noticed one MSF site about 1ms adrift from GPS, but it seems OK now. I now have a remote GPS S1 reference and MSF S1 reference in agreement to about 200us here. Peter _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
