Radio Regulations

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

All IBR Recommendations

As incorporated in RR-2016

This is not the text in force. It is the version of this Recommendation that RR-2016 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.1174-3

Mandatory (1995-1998-2004-2015)

Technical characteristics of equipment used for on-board vessel communications in the bands between 450 and 470 MHz

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 -3
RR-2020 -4
RR-2024 -4

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Footnote

5.287 5.288

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

This Recommendation describes the technical characteristics for equipment operating in the maritime mobile services in accordance with the provisions of No. 5.287 of the Radio Regulations (RR) for on-board vessel communications. Provision is made for 25 kHz or 12.5 kHz channel spacing for analogue and digital technologies. In addition, 6.25 kHz channel spacing may also be used for digital technology.

Keywords

Maritime on-board communication territorial waters channel spacing frequency arrangement UHF

Recommends

  1. that transmitters and receivers used in the maritime mobile service for on-board vessel communications in the bands between 450 and 470 MHz should conform to the technical characteristics shown in Annex 1;
  2. that for analogue technology the use of continuous tone coded squelch systems or digital coded squelch (DCS) constitute an effective means of mitigating the impression of congestion to the user;
  3. that for digital technology the use of DCS or a similar operational system should be used as a way to mitigate the impression of congestion to user;
  4. that during operation, to detect whether there is an available channel for operation, it is advised that a method of listen before talk be employed as a possible mitigation technique;
  5. that ship owners when replacing or installing communications equipment upon vessels are encouraged to fit equipment using 12.5 kHz or 6.25 kHz channel spacing.

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.