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1-millimeter band

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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 kilometres (71 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 kilometres (5.80 mi) between stations G0FDZ and G8CUB on April 30 2019.

In Australia, the 1 mm distance record was 10.8 kilometres (6.7 mi) set by stations VK3CV/3 and VK3NH/3 on August 5, 2024.

See also

References

  1. ^ "FCC Online Table of Frequency Allocations" (PDF). 47 C.F.R. Federal Communications Commission. May 7, 2019. Retrieved August 7, 2019.
  2. "VHF Managers Handbook" (PDF). 7. International Amateur Radio Union Region 1. January 2015. p. 56. Retrieved October 27, 2015.
  3. "IARU Region 2 Band Plan" (PDF). International Amateur Radio Union Region 2. October 14, 2016. p. 16.
  4. "Distance Records" (PDF). Amateur Radio Relay League. May 21, 2019. Retrieved August 2, 2019.
  5. ^ Day, Peter; Qaurmby, John (May 9, 2019). "Microwave Distance Records". UK Microwave Group. Retrieved August 2, 2019.
  6. "Australian VHF - UHF Records" (PDF). Wireless Institute of Australia. January 23, 2021. Archived (PDF) from the original on August 1, 2021. Retrieved July 31, 2021.

External links

International amateur radio frequency allocations
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
40 m 7.000–7.200 MHz 7.000–7.300 MHz 7.000–7.200 MHz
30 m 10.100–10.150 MHz
20 m 14.000–14.350 MHz
17 m 18.068–18.168 MHz
15 m 21.000–21.450 MHz
12 m 24.890–24.990 MHz
10 m 28.000–29.700 MHz
VHF 8 m 40.000–40.700 MHz —
6 m 50.000–52.000 MHz
(50.000–54.000 MHz) 		50.000–54.000 MHz
5 m 58.000–60.100 MHz —
4 m 70.000–70.500 MHz —
2 m 144.000–146.000 MHz 144.000–148.000 MHz
1.25 m — 220.000–225.000 MHz —
UHF 70 cm 430.000–440.000 MHz 430.000–440.000 MHz
(420.000–450.000 MHz)
33 cm — 902.000–928.000 MHz —
23 cm 1.240–1.300 GHz
13 cm 2.300–2.450 GHz
SHF 9 cm 3.400–3.475 GHz 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 75.500 GHz – 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.

All allocations are subject to variation by country. For simplicity, only common allocations found internationally are listed. See a band's article for specifics.
HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the "WARC bands".
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".
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.

See also: Radio spectrum, Electromagnetic spectrum


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