[tz] Fractional seconds in zic input

[Steve Allen]

On Mon 2018-02-05T15:32:06-0700 Brian Inglis hath writ:
> Have the ITU not dropped those requirements?

The current rec is
https://www.itu.int/rec/R-REC-TF.460-6-200202-I/en
It still demands 1 ms.

> Digital production and distribution systems introduce many ms to s delays in
> broadcast time signals, even non-FM BBC stations, and many stations are off UTC
> by seconds from higher precision sources like NTP and GPS.

TF.460 is not about generic broadcasts of content, it is about
broadcasts whose specific purpose is to be precision time signals.
But most devices which provide access to precise values of UTC obtain
that using newer technologies, not from these radio broadcasts.

--
Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
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