The 2.5 millimeter or 122 GHz band is a portion of the EHF (microwave) radio spectrum internationally allocated to amateur radio use on a secondary basis. The amateur radio band is between 122.250 GHz and 123.000 GHz. Amateur satellite operations are not permitted, and the ITU's allocation is the same in all three ITU regions.[1]
Amateur radio frequency allocations
Range | Band | ITU Region 1 | ITU Region 2 | ITU Region 3 |
---|---|---|---|---|
LF | 2200 m | 135.7 kHz - 137.8 kHz | ||
MF | 160 m | 1.810 MHz - 1.850 MHz | 1.800 MHz - 2.000 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 m1 | 5.250 MHz - 5.450 MHz | |||
40 m | 7.000 MHz - 7.200 MHz | 7.000 MHz - 7.300 MHz | 7.000 MHz - 7.200 MHz | |
30 m2 | 10.100 MHz - 10.150 MHz | |||
20 m | 14.000 MHz - 14.350 MHz | |||
17 m2 | 18.068 MHz - 18.168 MHz | |||
15 m | 21.000 MHz - 21.450 MHz | |||
12 m2 | 24.890 MHz - 24.990 MHz | |||
10 m | 28.000 MHz - 29.700 MHz | |||
VHF | 6 m | 50.000 MHz - 52.000 MHz1 | 50.000 MHz - 54.000 MHz | 50.000 MHz - 54.000 MHz |
4 m1 | 70.000 MHz - 70.500 MHz | |||
2 m | 144.000 MHz - 146.000 MHz | 144.000 MHz - 148.000 MHz | 144.000 MHz - 148.000 MHz | |
1.25 m | 220.000 MHz - 225.000 MHz | |||
UHF | 70 cm | 430.000 MHz - 440.000 MHz | 420.000 MHz - 450.000 MHz3 | 420.000 MHz - 450.000 MHz3 |
33 cm | 902.000 MHz - 928.000 MHz | |||
23 cm | 1.240 GHz - 1.300 GHz | |||
13 cm | 2.300 GHz - 2.450 GHz | |||
SHF | 9 cm | 3.400 GHz - 3.475 GHz3 | 3.300 GHz - 3.500 GHz | 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 mm3 | 75.500 GHz1 - 81.500 GHz | 76.000 GHz - 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. | ||
1 This is not mentioned in the ITU's Table of Frequency Allocations, but it is a de facto international amateur radio allocation. |
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See also: Radio spectrum ยท Electromagnetic spectrum |