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A printed version of the most recent version of the United States Frequency Allocations: The Radio Spectrum Chart (published in January 2016 from...
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.
The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band.
This chart portrays the frequency allocations in the electromagnetic spectrum for different purposes as specified by United States government. The Radio Frequency Spectrum Allocation Chart is the first and broadest level technical document to consult when planning uses for spectrum allocations in that nation’s borders.
In the United States the radio spectrum is managed by various agencies. See Basic Elements of Spectrum Management. The Federal Communications Commission (FCC) assigns frequencies and issues licenses to non-federal radio spectrum users.
The chart uses 33 color-coded categories to visualize the information in a crazy quilt of blocks (some wide, some narrow), spread from 9 kHz (very low frequency) all the way to 300 GHz...
Regions of the Electromagnetic Spectrum Listed below are the approximate wavelength, frequency, and energy limits of the various regions of the electromagnetic spectrum.