The International Amateur Radio Union (IARU) is a federation of national associations of certified radio amateurs, representing over 150 countries and separate territories around the world.

The three IARU Regions are organised to broadly mirror the structure of the International Telecommunications Union (ITU) and its related regional telecommunications organisations. The Regions comprise:
- IARU Region 1: Europe, Africa, the Middle East and Northern Asia
- IARU Region 2: The Americas
- IARU Region 3: Asia-Pacific

The IARU represents the interests of the Amateur Radio Service worldwide to relevant international organisations, promoting the interests of amateur radio and seeking to protect and enhance its spectrum privileges.

5.3 MHz in Sweden

PTS has now started to issue permits for experimental transmitters in the 5MHz band. Presently the following frequencies apply: 5310-5313 kHz, 5320-5323, 5380-5383 kHz and 5390-5393 kHz. Bandwith is limited to 3 kHz independent of type of modulation.

Maximum output power is 100 watt pep. Mobile use is not permitted. Holders of call sign for amateur radio may use their amateur radio call sign. It is permitted to make contact with other permit holders. This operation must respect all other traffic in the band. It is very important not to disturb other traffic.

PTS requires a fee for the administration. The permits are limited in time to 6 months.