The 9-centimeter band is a portion of the SHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use. The amateur radio band, in ITU regions 1 and 2, is between 3.300 GHz and 3.500 GHz, and it is available only on a secondary basis. The amateur satellite band is between 3.400 GHz and 3.410 GHz, 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 and Israel, the band 3.400 - 3.475 GHz is
also allocated to the amateur service on a secondary basis (ITU footnote 5.431).[1]
In CEPT's "European Common Allocation Table", footnote EU17 allocates 3.40 GHz to 3.41 GHz to European amateurs on a secondary basis.[2][3]
In the US, the FCC is recommending removing the amateur service from this band in order to make room for the 5G cellular system. There have been many objections to this proposal by Amateur Radio operators, including the ARRL.[4]
History
This section needs expansion with:
Origin. You can help by adding to it. (January 2012)
List of notable frequencies
ITU regions.
Region 1
Region 2
Region 3
3.4001 GHz: IARU Region-1 calling frequency[3] and Global EME center of activity[3][5]
3.332 - 3.339 GHz and 3.3458 - 3.3525 GHz are used by radio astronomers for spectral line observations.[5] 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.[1]
Countries with more restricted allocation
Sweden
The Swedish Post and Telecom Authority (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 3.400 - 3.401 GHz range are currently issued however.[6]
^
Blondeel Timmerman, Hans (15 March 2009). "3300-3500 MHz". International Amateur Radio Union Region 1 Homepage. International Amateur Radio Union Region 1. Retrieved August 4, 2011. EU17: In the sub-bands 3400-3410 MHz, 5660-5670 MHz, 10.36-10.37 GHz and 10.45-10.46 GHz the amateur service operates on a secondary basis. In making assignments to other services, CEPT administrations are requested wherever possible to maintain these sub-bands in such a way as to facilitate the reception of amateur emissions with minimal power flux densities.
^ abc"VHF Managers Handbook". 7. International Amateur Radio Union Region 1. January 2015. p. 48. Archived from the original(PDF) on June 17, 2018. Retrieved October 27, 2015.
Some administrations have authorized spectrum for amateur use in this region; others have declined to regulate frequencies above 300 GHz.
[v] All allocations are subject to variation by country. For simplicity, only common allocations found internationally are listed. See a band's article for specifics.
[w] HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the "WARC bands".
[x] This is not mentioned in the ITU's Table of Frequency Allocations, but many individual administrations have commonly adopted this allocation under "Article 4.4".
[y] This includes a currently active footnote allocation mentioned in the ITU's Table of Frequency Allocations. These allocations may only apply to a group of countries.
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