In message <[email protected]>, David Malone writes:
>> The Radio 4 time signal pips used to be produced by the RGO time service,
>> so they were also a means of broadcasting official legal time. The Radio 4
>> long-wave transmitter also was and remains a frequency standard. However
>> since the RGO's time service was terminated the BBC have generated the
>> pips themselves from GPS.
>
>There is also a phase modulated code on top of the BBC Radio 4 long
>wave transmission that includes the UTC time, up to the minute.
>
> http://downloads.bbc.co.uk/rd/pubs/reports/1984-19.pdf
>
>Though I guess this is provided by the BBC rather than the NPL. The
>French have something similar on top of TDF.
See:
http://phk.freebsd.dk/loran-c/CW/
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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