On 2023-12-21 18:22, Poul-Henning Kamp wrote:
My Tl;dr version of the resolution is:
..... Please keep DUT1 less than 100 seconds.
I do not read that from the text. The original [page 399] says:
" recognizing
.....
k) that the maximum value for the difference between UT1 and UTC
should be no less
than 100 seconds, taking into account the constraints of the
technological systems
expected to be used to disseminate this value, "
This seems to say that on the contrary, at least 3 decimal digits will
be needed for the integral part of the approximation of |UT1 - UTC| in
time signals that include an estimate of UT1 - UTC after 2035. Anyway,
I do not think that the CIPM will recommend a maximal value of 100 s
for |UT1 - UTC| because there is a slim chance that this will not be
enough until 2135.
On the other hand, ITU-R might come up with a scheme where the
approximation
of (UT1 - UTC) is only given modulo 100 s in radio signals, so that
2 digits
would suffice for the integral part.
Michael Deckers.
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