Citizens Band Radio | Communications - Britannica

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• citizens band (CB) radio - Student Encyclopedia (Ages 11 and up)

citizens band radio communications Ask Anything Also known as: CB radio Written and fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors History Britannica AI Ask Anything Table of Contents Table of Contents Ask Anything

citizens band radio, short-range radio voice communications system used chiefly by private individuals in motor vehicles, homes, offices, and other locations where wireless telephone service is unavailable. A typical CB radio consists of a combined transmitter-receiver (a transceiver) and an antenna. In the United States 40 channels, at frequencies from 26.965 to 27.225 megahertz or in the UHF range of 460 to 470 megahertz, have been allocated to CB radio. A federal limitation of power (4 watts) and practical limitations of antenna height restrict the range of CB radios in motor vehicles to about 25 km (15 miles) and those in fixed locations to no more than 50 km (30 miles).

Also called: Cb Radio (Show more) Related Topics: radio technology (Show more) See all related content

CB radio originated in the United States during the 1940s, when the Federal Communications Commission created the Citizens Radio Service for regulating remote-control units and mobile radiotelephones. The commission made CB radio a special class of the service in 1958 and permitted its use as a hobby in 1975. Several other nations, including Canada, Jamaica, and Germany, also allow CB communications.

This article was most recently revised and updated by Amy Tikkanen.