Due to the lack of commercial off the shelf radios, amateurs who operate on the 2 mm band must design and construct their own equipment, and those who do, often attempt to set communication distance records for the band.
The International Telecommunication Union allocates 134 GHz to 141 GHz to amateur radio and amateur satellites. Amateurs operate on a primary basis between 134 GHz and 136 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 136 GHz and 141 GHz. The ITU's allocations are the same in all three ITU Regions.
List of notable frequencies
The allocation was introduced as a result of changes at ITU's World Radiocommunication Conference 2000. Prior to this the amateur allocation was 142-144 GHz Primary and 144-149 GHz Secondary.
The first 2 mm distance record, and still standing longest distance achieved on the band, was set by US stations WA1ZMS and W4WWQ, who established contact at 114.4 kilometres (71.1 mi) on February 26, 2006.
- "FCC Online Table of Frequency Allocations" (PDF). 47 C.F.R. Federal Communications Commission. May 7, 2019. Retrieved August 7, 2019.
- "VHF Managers Handbook" (PDF). 7. International Amateur Radio Union Region 1. January 2015. p. 55. Retrieved October 27, 2015.
- "IARU Region 2 Band Plan" (PDF). International Amateur Radio Union Region 2. October 14, 2016. p. 16.
- "Distance Records" (PDF). Amateur Radio Relay League. May 21, 2019. Retrieved August 2, 2019.
- Day, Peter; Qaurmby, John (May 9, 2019). "Microwave Distance Records". UK Microwave Group. Retrieved August 2, 2019.
- "Australian VHF - UHF Records" (PDF). Wireless Institute of Australia. August 1, 2019. Retrieved August 7, 2019.[permanent dead link]
- UK Microwave Group's 134 GHz page
- First 134 GHz VUCC - Mount Greylock Expeditionary Force
- An Example of Gear for the 145GHz Amateur Band - Mount Greylock Expeditionary Force
|Range||Band||ITU Region 1||ITU Region 2||ITU Region 3|
|LF||2200 m||135.7–137.8 kHz|
|MF||630 m||472–479 kHz|
|160 m||1.810–1.850 MHz||1.800–2.000 MHz|
|HF||80 / 75 m||3.500–3.800 MHz||3.500–4.000 MHz||3.500–3.900 MHz|
|60 m||5.3515–5.3665 MHz|
Broken into channels and sub-bands, which vary by country.
|40 m||7.000–7.200 MHz||7.000–7.300 MHz||7.000–7.200 MHz|
|30 m[w]||10.100–10.150 MHz|
|20 m||14.000–14.350 MHz|
|17 m[w]||18.068–18.168 MHz|
|15 m||21.000–21.450 MHz|
|12 m[w]||24.890–24.990 MHz|
|10 m||28.000–29.700 MHz|
|VHF||6 m||50.000–52.000 MHz
|4 m[x]||70.000–70.500 MHz||N/A|
|2 m||144.000–146.000 MHz||144.000–148.000 MHz|
|1.25 m||N/A||220.000–225.000 MHz||N/A|
|UHF||70 cm||430.000–440.000 MHz||430.000–440.000 MHz|
|33 cm||N/A||902.000–928.000 MHz||N/A|
|23 cm||1.240–1.300 GHz|
|13 cm||2.300–2.450 GHz|
|SHF||9 cm||3.400–3.475 GHz[y]||3.300–3.500 GHz|
|5 cm||5.650–5.850 GHz||5.650–5.925 GHz||5.650–5.850 GHz|
|3 cm||10.000–10.500 GHz|
|1.2 cm||24.000–24.250 GHz|
|EHF||6 mm||47.000–47.200 GHz|
|4 mm[y]||75.500 GHz[x] – 81.500 GHz||76.000–81.500 GHz|
|2.5 mm||122.250–123.000 GHz|
|2 mm||134.000–141.000 GHz|
|1 mm||241.000–250.000 GHz|
|THF||Sub-mm||Some administrations have authorized spectrum for amateur use in this region;|
others have declined to regulate frequencies above 300 GHz, leaving them available by default.
[w] HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the "WARC bands".
|See also: Radio spectrum, Electromagnetic spectrum|