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Citizens' band radioCitizens' band radio (CB) is a system of short distance communication between individuals on a selection of 40 channels within the single 27 MHz (11 meter) band. radio frequencies.
Following a decision in 1945 by the US government that its citizens should have this right, the US Federal Communication Commission allocated a frequency of 467 MHz FM for the General Mobile Radio Service. The CB radio service should not be confused with GMRS or Amateur (Ham) Radio. CB does not require a license. Both GMRS and Amateur Radio do require licenses and Amateur (Ham) Radio also requires the passing of exams before a license and call sign is issued by the FCC. In 1958 extra, lower-frequency channels were introduced on AM to encourage use. The 11-meter band was taken from the Amateur Radio service for the Citizen's Band. But it was not until the 1970s, when technology had advanced to reduce costs, that the CB market prospered, US truckers being at the head of the boom. Many CB clubs were formed and a special CB language evolved.
In the US, CB radio seems to adhere to the following defacto plan:
Channel 1 Local community calling and working
The 27MHz FCC Bandplan shows the channels available and their associated frequencies.
Although CB was created in the USA it is also used in many different countries around the world.
See also amateur radio
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