[time-nuts] 90ms delay of time signal on phase-modulated carrier of BBC 198KHz transmission in the UK (was: DST change on DCF77)

[Steve Allen]

On Wed 2019-11-20T11:35:51+0000 Peter Vince hath writ:
> As I mentioned in a previous message about observed anomalies with the DST
> change on DCF77, Pieter-Tjerk in the Netherlands noted that the time
> encoded on the phase-modulated carrier of the BBC's 198KHz signal in the UK
> was about 900 milliseconds early.  Having queried that with a contact in
> the BBC, a problem was found and corrected, but Pieter-Tjerk reports the
> signal is now about 90 milliseconds late.  A further query with my contact
> reveals that this is to be expected.

90 milliseconds is a larger offset than was seen in the broadcasts that
the BIH monitored during most of its existence as seen in these plots
https://www.ucolick.org/~sla/leapsecs/BHsHn05p142.html

This report indicates that the clock time blocks are intended to
provide UTC
https://downloads.bbc.co.uk/rd/pubs/reports/1984-19.pdf

The current version ITU-R TF.460-6 says that time signals should
not deviate by more than 1 ms from UTC.

How can these broadcasts justify such a large offset?

--
Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
UCO/Lick Observatory--ISB 260  Natural Sciences II, Room 165  Lat  +36.99855
1156 High Street               Voice: +1 831 459 3046         Lng -122.06015
Santa Cruz, CA 95064           https://www.ucolick.org/~sla/  Hgt +250 m