The 9-centimeter band is a portion of the SHF (

microwave Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively. Different sources define different frequency ra ...

) radio spectrum internationally allocated to amateur radio and

amateur satellite An amateur radio satellite is an artificial satellite built and used by amateur radio operators. It forms part of the Amateur-satellite service. These satellites use amateur radio frequency allocations to facilitate communication between amat ...

use. The amateur radio band, in

ITU region The International Telecommunication Union (ITU), in its International Radio Regulations, divides the world into three ITU regions for the purposes of managing the global radio spectrum. Each region has its own set of frequency allocations, the ma ...

s 1 and 2, is between 3,300 MHz and 3,500 MHz, and it is available only on a secondary basis. The amateur satellite band is between 3,400 MHz and 3,410 MHz, and it is only available in ITU Regions 1 and 2, on a non-interference basis to other users (ITU footnote 5.282). In

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

and

Israel Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...

, the band 3,400 - 3,475 MHz is also allocated to the amateur service on a secondary basis (ITU footnote 5.431). In CEPT's "European Common Allocation Table", footnote EU17 allocates 3,400 MHz to 3,410 MHz to

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located entirel ...

an amateurs on a secondary basis. In the US, the FCC proposes to remove the amateur service (among other users) from this band for the purposes of 5G cellular system expansion. There have been many objections to this proposal by Amateur Radio operators, including the ARRL.

History

List of notable frequencies

International Telecommunication Union region

*3,400.1 MHz IARU Region-1 Calling frequency and Global EME center of activity *3,456.1 MHz IARU Region 2 Calling Frequency

Radio Astronomy

3,332 - 3,339 MHz and 3345.8 - 3352.5 MHz are used by radio astronomers for spectral line observations. Amateur stations voluntarily avoid using these frequencies when in geographic proximity to a radio telescope. ITU footnote 5.149 encourages all radio communications in the band to take practical steps to avoid harmful interference to radio astronomy observations in those frequency ranges.

Countries with more restricted allocation

Sweden

The

Swedish Post and Telecom Authority The Swedish Post and Telecom Authority ( sv, Post- och telestyrelsen, abbreviated PTS) is a government authority under the Ministry of Infrastructure (Sweden) and is managed by a board of directors appointed by the Swedish government. The Director- ...

(PTS) does not consider 3.4 GHz to be an amateur band, and has therefore auctioned it off for 5G test use. Temporary permits in the 3400 - 3401 MHz range are currently issued however.

Spain

Th
Ministerio de Economía y Empresa
does not allow 3.4 GHz to be used by amateurs. Currently this band is used by WiMax in Spain and will be soon used by 5G services.

References

Amateur radio bands Centimetric bands {{Amateur-radio-stub