2.5-millimeter band

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]

The 122GHz band coincides with a molecular resonance of Oxygen which causes significant atmospheric propagation losses - similar to the 60GHz band.

Frequencies of note

122.5 GHz ISM band center frequency^[1]

References

↑ 1.0 1.1 "FCC Online Table of Frequency Allocations" (PDF). 47 C.F.R. Federal Communications Commission. June 2, 2011. Retrieved August 4, 2011.

International 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	600 m	472 kHz - 479 kHz
MF	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 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
	4 m¹	70.000 MHz - 70.500 MHz
	2 m	144.000 MHz - 146.000 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	430.000 - 440.000 MHz (420.000 - 450.000 MHz)³
	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
	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
	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 individual administrations may make allocations under Article 4.4 of the ITU Radio Regulations. See the appropriate Wiki page for further information. ² HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the "WARC bands". ³ 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

2.5-millimeter band

Frequencies of note

See also

References