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 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). Shown with Astatic brand D-104 desk mic Cobra 18 WX ST II mobile CB radio with microphone Cobra 50 WX ST Handheld CB RadioĬitizens band radio ( CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band. "Base stations" are usually operated on household AC power but can also from a vehicle's DC power system if operated in a vehicle or from an emergency battery source. Land mobile radio system Typical 1980s CB radio intended for use at a fixed location and used with outdoor antenna.
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