Definition of time scale and dissemination of time signals via radiocommunication systems

APT View:

  • APT Members support the ITU-R studies conducted under Resolution 655 (WRC-15), recognizing that the 27th General Conference on Weights and Measures (CGPM) in November 2022 adopted Resolution 4 and decided that the maximum value for the difference (UT1 – UTC) would be increased. APT Members are of the view that modification to Resolution 655 (WRC-15) is necessary to reflect the decision made by CGPM.
  • APT Members also recognize the responsibility of the International Bureau of Weights and Measures (BIPM) for the maintenance of a global time scale and believes that the responsibility of the ITU-R includes the spectrum allocation for radiocommunication time signal dissemination and the associated ITU Recommendation(s) for their dissemination.
  • APT Members support the continuation of the ITU-R studies to cooperate further with the BIPM, the International Committee of Weights and Measures (CIPM) and CGPM on the future of UTC.
  • APT Members would like to end leap seconds.

APT Common Proposal: Doc. WRC-23/62 (Add.24)(Add.6)

AI Coordinator: Mr. Takahiro Yokoyama (Japan)
Contact: t.yokoyama[at]

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