International Telecommunication Union (ITU) references | ACMA

International Telecommunication Union (ITU) references

Resolution No. 644

Telecommunication resources for disaster mitigation and relief operations

The World Radiocommunication Conference (Istanbul, 2000),


  1. that ITU, in the same spirit as reflected in Articles 40 and 46 of its Constitution has specifically recognised the importance of the international use of radiocommunications in the event of natural disasters, epidemics, famine and similar emergencies;
  2. that the Plenipotentiary Conference (Minneapolis, 1998), in endorsing Resolution 19 of the World Telecommunication Development Conference (Valetta, 1998), adopted Resolution 36 (Rev. Minneapolis, 1998) on telecommunications in the service of humanitarian assistance;
  3. that administrations have been urged to take all practical steps to facilitate the rapid deployment and effective use of telecommunication resources for disaster mitigation and disaster relief operations by reducing and, where possible, removing regulatory barriers and strengthening transborder cooperation between States,


  1. the potential of modern telecommunication technologies as an essential tool for disaster mitigation and relief operations and the vital role of telecommunications for the safety and security of relief workers in the field;
  2. the particular needs of developing countries and the special requirements of the inhabitants of remote areas,


that the Intergovernmental Conference on Emergency Telecommunications (ICET-98), held from 16 to 18 June 1998 in Tampere, Finland, adopted the Convention on the Provision of Telecommunication Resources for Disaster Mitigation and Relief Operations (Tampere Convention),


to invite the ITU Radiocommunication Sector to continue to study, as a matter of urgency, those aspects of radiocommunications that are relevant to disaster mitigation and relief operations, such as decentralised means of communications that are appropriate and generally available, including amateur radio facilities and mobile and portable satellite terminals,

instructs the Director of the Radiocommunications Bureau

to support administrations in their work towards the implementation of Resolution 36 (Rev. Minneapolis, 1998) and the Tampere Convention.

Article 25

Section I. Amateur service

Paragraph Section Text of Article
25.1 1

Radiocommunication between amateur stations of different countries shall be permitted unless the administration of one of the countries concerned has notified that it objects to such radiocommunications.

25.2 2 1)

Transmissions between amateur stations of different countries shall be limited to communications incidental to the purposes of the amateur service, as defined in No. 1.56 and to remarks of a personal character.

25.2A 1bis)

Transmissions between amateur stations of different countries shall not be encoded for the purpose of obscuring their meaning, except for control signals exchanged between earth command stations and space stations in the amateur-satellite service.

25.3 2 2)

Amateur stations may be used for transmitting international communications on behalf of third parties only in case of emergencies or disaster relief. An administration may determine the applicability of this provision to amateur stations under its jurisdiction.

25.5 3 1)

Administrations shall determine whether or not a person seeking a licence to operate an amateur station shall demonstrate the ability to send and receive texts in Morse code signals.

25.6 3 2)

Administrations shall verify the operational and technical qualifications of any person wishing to operate an amateur station.  Guidance for standards of competence may be found in the most recent version of Recommendation ITU-R M.15441.

25.7 4

The maximum power of amateur stations shall be fixed by the administrations concerned.

25.8 5 1)

All pertinent Articles and provisions of the Constitution, the Convention and of these Regulations shall apply to amateur stations.

25.9 5 2)

During the course of their transmissions, amateur stations shall transmit their call sign at short intervals.


Administrations are encouraged to take the necessary steps to allow amateur stations to prepare for and meet communication needs in support of disaster relief.


An administration may determine whether or not to permit a person who has been granted a licence to operate an amateur station by another administration to operate an amateur station while that person is temporarily in its territory, subject to such conditions or restrictions it may impose.

1. ITU-R M.1544 recommends that persons seeking an amateur licence should demonstrate theoretical knowledge of the Radio Regulations, methods radiocommunication, radio system theory, radio emission safety, electromagnetic compatibility, and avoidance and resolution of radiofrequency interference.

Section II. Amateur-satellite service

Paragraph Section Text of Article
25.10 6

The provisions of Section I of this Article shall apply equally, as appropriate, to the amateur-satellite service.

25.11 7

Administrations authorizing space stations in the amateur-satellite service shall ensure that sufficient earth command stations are established before launch to ensure that any harmful interference caused by emissions from a station in the amateur-satellite service can be terminated immediately (see No. 22.1)

Article 22

Space services1

Section I. Cessation of emissions

Reg. No Item Text of Article
22.1 1.

Space stations shall be fitted with devices to ensure immediate cessation of their radio emissions by telecommand, whenever such cessation is required under the provisions of these Regulations.

1. In applying the provisions of this Article, the level of accepted interference (see No s1.168) shall be fixed by agreement between the administrations concerned, using the relevant ITU-R Recommendations as a guide.

Definition of terms

Harmful interference (s1.169) means interference that:

  1. endangers the functioning of a radionavigation service or of other safety services or
  2. seriously degrades, obstructs, or repeatedly interrupts a radiocommunication service operating in accordance with Radio Regulations.

Definitions of terms used to express transmitter power

The ITU Radio Regulations define the terms Peak Envelope Power, Mean Power and Carrier Power with regard to a radio transmitter. The terms are defined as:

Peak Envelope Power 'pX' (s1.157) means the average power supplied to the antenna transmission line by a transmitter during one radiofrequency cycle at the crest of the modulation envelope taken under normal operating conditions.

Mean Power 'pY' (s1.158) means the average power supplied to the antenna transmission line by a transmitter during an interval of time sufficiently long compared with the lowest frequency encountered in the modulation taken under normal operating conditions.

Carrier Power 'pZ' (s1.159) means the average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle taken under the condition of no modulation.

Note: For use in formulae, the symbol p denotes power expressed in watts and the symbol P denotes power expressed in decibels relative to a reference level.

Last updated: 27 February 2017