A frequence range or frequency band is a range of
wave frequencies. It most often refers to either a range of frequencies in
sound or a range of frequencies in
electromagnetic radiation, which includes light and radio waves. Many radio devices operate within a specified frequency range which limits the frequencies on which it is allowed to transmit. The lower-bound and upper-bound frequencies are the points at which signal strength of the device falls off by 3dB.
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A continuous range or spectrum of frequencies that extends from one
limiting frequency to another. Note 1: The frequency range for given equipment specifies the frequencies at which the equipment is operable. For example, filters pass or stop certain bands of frequencies. The frequency range for
propagation indicates the frequencies at which
electromagnetic wave propagation in certain modes or paths is possible over given distances. Frequency
allocation, however, is made in terms of bands of frequencies. There is little, if any, conceptual difference between a range of frequencies and a
band of frequencies. Note 2: "Frequency band" usually identifies a specific band of frequencies in the Tables of Frequency Allocations. [
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