630-meter band

The band is available on a secondary basis in all ITU regions with the limitation that amateur stations have maximum radiated power of 1 watt effective isotropic radiated power (EIRP); however, stations more than 800 km (500 miles) from certain countries[a] may be permitted to use 5 watts EIRP.

During the 2012 World Radiocommunication Conference (WRC-12) of the International Telecommunication Union, a 15 kHz allocation to the amateur radio service was considered on a secondary use basis.

[5] The result was that 472–479 kHz was identified as agreeable for all three ITU Regions, except for some countries such as Russia, China, and some Arab states.

Following that, individual regulatory authorities need to implement the change nationally in order to make the allocation available to radio amateurs under their jurisdiction.

[10][11] In France (including the French Overseas Departments and Territories) amateurs have access to 472–479 kHz, with 1 watt EIRP.

[13] In New Zealand, the band 472–479 kHz was allocated to amateur radio, on a secondary basis, with an effective date of 20 December 2012.

[14] In Norway, including Svalbard, Jan Mayen, and the Bouvet Island, amateurs have an allocation of 472–479 kHz on a secondary basis.

[18] In the United States, the Federal Communications Commission approved allocating 472–479 kHz on a secondary basis to the amateur service, in a report and order released on 29 March 2017.

Only CW may be used with a maximum ERP of 5 W.[22] On 14 August 2013, an additional allocation for 472–479 kHz has been added allowing all modes of transmission.

[25] Now that an international frequency allocation has been made by the ITU and subsequently implemented in New Zealand, this temporary band is being phased out.

The U.S. Federal Communications Commission (FCC) granted the American Radio Relay League an experimental license to explore such uses in September 2006.

[26] Eleven years later, the US FCC granted access to all amateurs with a general (or higher) license, effective 13 October 2017.

[22] Other regions with experimental operations include Croatia, Czech Republic, Denmark, Iceland, Sweden, Spain, and Slovenia.

Regions with an amateur radio allocation near 500 kHz in early 2011. Dark blue indicates official allocations based on WRC-12. Light blue indicates official allocations that are outside the WRC-12 frequencies (e.g. Norway). Green indicates experimental allocations. Operation is prohibited in red regions.