2.5-millimeter band

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

List of notable frequencies[edit]

  • 122.250 to 122.251 GHz Narrow band modes[2][3]
  • 122.5 GHz ISM band center frequency[1]

See also[edit]


  1. ^ a b "FCC Online Table of Frequency Allocations" (PDF). 47 C.F.R. Federal Communications Commission. August 13, 2015. Retrieved October 27, 2015. 
  2. ^ "VHF Managers Handbook" (PDF). 7. International Amateur Radio Union Region 1. January 2015. p. 54. Retrieved October 27, 2015. 
  3. ^ "IARU Region 2 Band Plan" (PDF). International Amateur Radio Union Region 2. October 14, 2016. p. 16.