1-millimeter band

Amateur radio frequency band The 1-millimeter band is a portion of the EHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use. The band is between 241 GHz and 250 GHz. Due to the lack of commercial off the shelf radios, amateurs who operate on the 1 mm band must design and construct their own equipment, and those who do, often attempt to set communication distance records for the band. Allocation The International Telecommunication Union allocates 241 GHz to 250 GHz to amateur radio and amateur satellites. Amateurs operate on a primary basis between 248 GHz and 250 GHz and on a secondary basis in the rest of the band. As such, amateurs must protect the radio astronomy and radiolocation services from harmful interference, which share the band with amateurs between 241 GHz and 248 GHz. In addition, 244 GHz to 246 GHz is an ISM band, and all users must accept interference caused by ISM devices. The ITU's allocations are the same in all three ITU Regions. List of notable frequencies 245 GHz ISM band center frequency 248.000 to 248.001 GHz Satellite and narrow band modes Distance records The current world distance record on the 1 mm band was 114 km mi set by US stations WA1ZMS and W4WWQ on January 21, 2008. The longest distance achieved on 1 mm in the United Kingdom was 9.33 km mi between stations G0FDZ and G8CUB on April 30 2019. In Australia, the 1 mm distance record was 10.8 km mi set by stations VK3CV/3 and VK3NH/3 on August 5, 2024. See also Amateur radio frequency allocations References https://transition.fcc.gov/oet/spectrum/table/fcctable.pdf FCC Online Table of Frequency Allocations May 7, 2019 47 C.F.R. Federal Communications Commission August 7, 2019 http://www.iaru-r2.org/documents/explorer/files/Plan%20de%20bandas%20%7C%20Band-plan/R2%20Band%20Plan%202016.pdf IARU Region 2 Band Plan International Amateur Radio Union Region 2 16 October 14, 2016 http://www.iaru-r1.org/index.php/documents/func-download/580/chk,f9e4e4a0053473343dfd0d809805d442/no_html,1/ VHF Managers Handbook 7 International Amateur Radio Union Region 1 PDF 56 January 2015 October 27, 2015 June 17, 2018 https://web.archive.org/web/20180617050730/http://www.iaru-r1.org/index.php/documents/func-download/580/chk,f9e4e4a0053473343dfd0d809805d442/no_html,1 dead http://www.arrl.org/files/file/WA50-Standings/Distance_Records_21-May-2019.pdf Distance Records May 21, 2019 Amateur Radio Relay League August 2, 2019 https://www.microwavers.org/index.htm?records.htm Microwave Distance Records Day Peter Qaurmby John May 9, 2019 UK Microwave Group August 2, 2019 https://www.wia.org.au/members/records/data/documents/VHF%20Records%20210123.pdf Australian VHF - UHF Records January 23, 2021 Wireless Institute of Australia July 31, 2021 live August 1, 2021 https://web.archive.org/web/20210801025628/https://www.wia.org.au/members/records/data/documents/VHF%20Records%20210123.pdf External links UK Microwave Group's 241 GHz page Setting a distance record on 241 GHz - Mount Greylock Expeditionary Force First 241 GHz VUCC - Mount Greylock Expeditionary Force Category:Amateur radio bands