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The NATO H band is the obsolete designation given to the radio frequencies from 6,000 to 8,000 MHz (equivalent to wavelengths between 5 and 3.75 cm) during the Cold War period. Since 1992, frequencies have been allocated, allotted, and assigned in accordance with the NATO Joint Civil/Military Frequency Agreement (NJFA). [ 1 ]
The H band is the transmission window centred on 1.65 micrometres In infrared astronomy , the H band refers to an atmospheric transmission window centred on 1.65 micrometres with a Full width at half maximum of 0.35 micrometres [ 1 ] (in the near-infrared ).
H band may refer to: H band (infrared), an atmospheric transmission window centred on 1.65 μm; H band (NATO), a radio frequency band from 6 to 8 GHz;
Very high frequency (VHF) is the ITU designation [1] [2] [3] for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter.
The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The electromagnetic waves in each of these bands have different characteristics, such as how they are ...
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The use of U,B,V,R,I bands dates from the 1950s, being single-letter abbreviations. [b] With the advent of infrared detectors in the next decade, the J to N bands were labelled following on from near-infrared's closest-to-red band, I. Later the H band was inserted, then Z in the 1990s and finally Y, without changing earlier definitions.