Radio Regulations

Source: the Radio Regulations published by the International Telecommunication Union (ITU).

All IBR Recommendations
TF

Recommendation ITU-R TF.460-6

Mandatory (1970-1974-1978-1982-1986-1997-2002)

Standard-frequency and time-signal emissions

View official text at ITU

Version history

Version evolution

The number in each cell (e.g. −9) is the Recommendation's revision number — the “-9” in ITU-R M.585-9, not a negative value. So −8 → −9 means the binding reference moved from the 8th to the 9th revision.

RR-2008 -6
RR-2012 -6
RR-2016 -6
RR-2020 -6
RR-2024 -6

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Resolution

Resolution 655 (Rev.WRC-23)

Provision

1.14

Scope

the World Administrative Radio Conference, Geneva, 1979, allocated the frequencies 20 kHz ± 0.05 kHz, 2.5 MHz ± 5 kHz (2.5 MHz ± 2 kHz in Region 1), 5 MHz ± 5 kHz, 10 MHz ± 5 kHz, 15 MHz ± 10 kHz, 20 MHz ± 10 kHz and 25 MHz ± 10 kHz to the standard-frequency and time-signal service;

Recommends

  1. that all standard-frequency and time-signal emissions conform as closely as possible to coordinated universal time (UTC) (see Annex 1); that the time signals should not deviate from UTC by more than 1 ms; that the standard frequencies should not deviate by more than 1 part in 1010, and that the time signals emitted from each transmitting station should bear a known relation to the phase of the carrier;
  2. that standard-frequency and time-signal emissions, and other time-signal emissions intended for scientific applications (with the possible exception of those dedicated to special systems) should contain information on UT1 − UTC and TAI − UTC (see Annex 1).

Source: ITU Radio Regulations, editions of 2008, 2012, 2016, 2020 and 2024. The English, French and Spanish texts are each taken from the official edition in that language, not translated from one another. Sources and citation.