23-centimeter band

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The 23 centimeter, 1200 MHz or 1.2 GHz band is a portion of the UHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use on a secondary basis. The amateur radio band is between 1240 MHz and 1300 MHz. The amateur satellite band is between 1260 MHz and 1270 MHz, and its use by satellite operations is only for up-links on a non-interference basis to other radio users (ITU footnote 5.282). The allocations are the same in all three ITU regions.[1]

In the United Kingdom the band is between 1240 MHz and 1325 MHz.[2]

Most modes of communication used in amateur radio can be found in the 23 cm band. Some of the more common modes include voice, data, EME (moonbounce), as well as ATV.[3]

History[edit]

List of notable frequencies[edit]

ITU regions.
  Region 1
  Region 2
  Region 3

Frequencies in the 23 cm band are harmonized by International Telecommunication Union region.

Region 1[edit]

  • CW and SSB calling frequency is 1296.2 MHz.[4]
  • FM simplex calling frequency is 1297.5 MHz.[4]

Region 2[edit]

  • CW and SSB calling frequency is 1296.1 MHz.[5]
  • FM simplex calling frequency is 1294.5 MHz.[5]

Region 3[edit]

  • FM Simplex Calling Frequency is 1294.0 MHz (VK Australian band-plan 2007)

In 2008 the IARU Region-1 Cavtat Conference designated 1240.000-1240.750 MHz as an alternative centre for narrowband activity and beacons. This is a mitigation for sharing with existing aviation radars and Primary users, or for potential issues with the European Galileo system.

See also[edit]

References[edit]

  1. ^ "FCC Online Table of Frequency Allocations" (PDF). 47 C.F.R. Federal Communications Commission. August 13, 2015. Retrieved October 27, 2015.
  2. ^ "RSGB Band Plan". Radio Society of Great Britain. Radio Society of Great Britain. 1 January 2012. Retrieved February 11, 2012.
  3. ^ American Radio Relay League's Band Plan for 23cm
  4. ^ a b "VHF Managers Handbook" (PDF). 7. International Amateur Radio Union Region 1. January 2015. pp. 45–46. Retrieved October 27, 2015.
  5. ^ a b "IARU Region 2 Band Plan" (PDF). International Amateur Radio Union Region 2. October 14, 2016. pp. 11–12.
Range Band ITU Region 1 ITU Region 2 ITU Region 3
LF 2200 m 135.7 kHz – 137.8 kHz
MF 630 m 472 kHz – 479 kHz
160 m 1.810 MHz – 1.850 MHz 1.800 MHz – 2.000 MHz
HF 80 / 75 m 3.500 MHz – 3.800 MHz 3.500 MHz – 4.000 MHz 3.500 MHz – 3.900 MHz
60 m 5.3515 MHz – 5.3665 MHz
40 m 7.000 MHz – 7.200 MHz 7.000 MHz – 7.300 MHz 7.000 MHz – 7.200 MHz
30 m[w] 10.100 MHz – 10.150 MHz
20 m 14.000 MHz – 14.350 MHz
17 m[w] 18.068 MHz – 18.168 MHz
15 m 21.000 MHz – 21.450 MHz
12 m[w] 24.890 MHz – 24.990 MHz
10 m 28.000 MHz – 29.700 MHz
VHF 6 m 50.000 MHz – 52.000 MHz[x] 50.000 MHz – 54.000 MHz
4 m[x] 70.000 MHz – 70.500 MHz N/A
2 m 144.000 MHz – 146.000 MHz 144.000 MHz – 148.000 MHz
1.25 m N/A 220.000 MHz – 225.000 MHz N/A
UHF 70 cm 430.000 MHz – 440.000 MHz 430.000 MHz – 440.000 MHz
(420.000 MHz – 450.000 MHz)[y]
33 cm N/A 902.000 MHz – 928.000 MHz N/A
23 cm 1.240 GHz – 1.300 GHz
13 cm 2.300 GHz – 2.450 GHz
SHF 9 cm 3.400 GHz – 3.475 GHz[y] 3.300 GHz – 3.500 GHz
5 cm 5.650 GHz – 5.850 GHz 5.650 GHz – 5.925 GHz 5.650 GHz – 5.850 GHz
3 cm 10.000 GHz – 10.500 GHz
1.2 cm 24.000 GHz – 24.250 GHz
EHF 6 mm 47.000 GHz – 47.200 GHz
4 mm[y] 75.500 GHz[x] – 81.500 GHz 76.000 GHz – 81.500 GHz
2.5 mm 122.250 GHz – 123.000 GHz
2 mm 134.000 GHz – 141.000 GHz
1 mm 241.000 GHz – 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