6-millimeter band

The 6-millimeter or 47 GHz band is a portion of the EHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use between 47.0 GHz and 47.2 GHz.[1]

Due to the lack of commercial off the shelf radios, amateurs who operate on the 6 mm band must design and construct their own equipment.[2] Amateurs often use the band to experiment with the maximum communication distance they can achieve, and they also use it occasionally for radio contesting.[2] In some areas, amateurs maintain 47 GHz propagation beacons on mountain tops.[2] The band has been successfully used by amateurs in moon bounce contacts.[2][3]

Allocation

The International Telecommunication Union allocates 47.0 GHz to 47.2 GHz to amateur radio and amateur satellites on a primary basis in all three ITU regions.[1]

It is the only EHF band amateurs do not share with other radio services, and it is the only band above 2 meters which is exclusively for the amateur services in its entirety.[1]

List of notable frequencies
  • 47.0882 GHz Narrow band calling frequency[4][5]
  • 47.088 GHz Propagation beacons[2]

Distance records

The current world distance record on the 6 mm band was 344.8 kilometres (214.2 mi) set by US stations AD6FP and W6QIW on September 19, 2015.[6]

The longest distance achieved on 6 mm in the United Kingdom was 203 kilometres (126 mi) between stations GM7MRF / GM0HNW and GW0IVA on October 21, 2001.[3]

In Australia, the 6 mm distance record was 177.9 kilometres (110.5 mi) set by stations VK3HZ / VK3APW and VK3XPD on January 11, 2017.[7]

The 6 mm Earth-Moon-Earth record was 9,967 kilometres (6,193 mi) set by stations AD6FP and RW3BP on January 23, 2005.[3]

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. "UK Amateur Radio in 47GHz" (PDF). Radio Society of Great Britain. August 23, 2016. Retrieved August 7, 2019.
  3. Day, Peter; Qaurmby, John (May 9, 2019). "Microwave Distance Records". UK Microwave Group. Retrieved August 7, 2019.
  4. "VHF Managers Handbook". 7. International Amateur Radio Union Region 1. January 2015. p. 52. Archived from the original (PDF) on June 17, 2018. Retrieved October 27, 2015.
  5. "IARU Region 2 Band Plan" (PDF). International Amateur Radio Union Region 2. October 14, 2016. p. 15.
  6. "Distance Records" (PDF). Amateur Radio Relay League. May 21, 2019. Retrieved August 7, 2019.
  7. "Australian VHF – UHF Records" (PDF). Wireless Institute of Australia. August 1, 2019. Retrieved August 7, 2019.
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[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
(50.000–54.000 MHz)[y]		 50.000–54.000 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
(420.000–450.000 MHz)[y]
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".
[x] This is not mentioned in the ITU's Table of Frequency Allocations, but individual administrations may make allocations under "Article 4.4". ITU Radio Regulations.. See the appropriate Wiki page for further information.
[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.

See also: Radio spectrum, Electromagnetic spectrum


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