Radio Regulations

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

All IBR Recommendations

As incorporated in RR-2020

This is not the text in force. It is the version of this Recommendation that RR-2020 gave treaty-binding force, kept so that the incorporated set can be read as it stood at each conference.

M

Recommendation ITU-R M.476-5

Mandatory (1970-1974-1978-1982-1986-1995)

Direct-printing telegraph equipment in the maritime mobile service

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 -5
RR-2012 -5
RR-2016 -5
RR-2020 -5
RR-2024 —

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Provision

19.83 19.96A 51.41

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

there is a requirement to interconnect mobile stations, or mobile stations and coast stations, equipped with start-stop apparatus employing the ITU-T International Telegraph Alphabet No. 2, by means of radiotelegraph circuits;

Recommends

  1. that when an error-detecting and correcting system is used for direct-printing telegraphy in the maritime mobile service, a 7-unit ARQ system or a 7-unit forward acting, error-correcting and indicating time-diversity system, using the same code, should be employed;
  2. that equipment designed in accordance with § 1 should meet the characteristics laid down in 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.