Radio Regulations

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

All IBR Recommendations

As incorporated in RR-2008

This is not the text in force. It is the version of this Recommendation that RR-2008 gave treaty-binding force, kept so that the incorporated set can be read as it stood at each conference.

See the edition in force (RR-2024)
M

Recommendation ITU-R M.489-2

Mandatory (1974-1978-1995)

Technical characteristics of VHF radiotelephone equipment operating in the maritime mobile service in channels spaced by 25 kHz

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 -2
RR-2012 -2
RR-2016 -2
RR-2020 -2
RR-2024 -2

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Bands and services are derived from the footnotes of the Radio Regulations as they stand, so they are shown only on the edition in force.

Scope

Resolution No. 308 of the World Administrative Radio Conference (Geneva, 1979) stipulated that:

Recommends

  1. that the following characteristics should be met by VHF (metric) FM radiotelephone equipment used for the maritime mobile services operating on the frequencies specified in RR Appendix S18 [Appendix 18].
  2. 1.1 General characteristics
  3. 1.1.1 The class of emission should be F3E/G3E.
  4. 1.1.2 The necessary bandwidth should be 16 kHz.
  5. 1.1.3 Only phase modulation (frequency modulation with a pre-emphasis characteristic of 6 dB/octave) should be used.
  6. 1.1.4 The frequency deviation corresponding to 100% modulation should approach ± 5 kHz as nearly as practicable. In no event should the frequency deviation exceed ± 5 kHz. Deviation limiting circuits should be employed such that the maximum frequency deviation attainable should be independent of the input audio frequency.

+21 more in the full text

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.