Like many other land mobile radio services, multiple radios in a local area share a single frequency channel, but only one can transmit at a time. In many countries, CB operation does not require a license, and (unlike amateur radio) it may be used for business or personal communications. Citizens band is distinct from other personal radio service allocations such as FRS, GMRS, MURS, UHF CB and the Amateur Radio Service ( "ham" radio). Cobra 18 WX ST II mobile CB radio with microphoneĬitizens band radio (also known as CB radio), used in many countries, is a land mobile radio system, a system allowing short-distance person-to-many persons bidirectional voice communication among individuals, using two way radios operating on 40 channels near 27 MHz (11 m) in the high frequency (a.k.a.
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