CB
radio
is most frequently used for conversations between places that are not linked by telephone. Many motorists and truck drivers use it to talk with other highway
travelers or people who are in an office or at home.
Most CB sets are devices called transceivers, which consist
of a transmitter and a receiver. Some CB devices receive radio signals but do
not transmit them.
Most
CB transmitters broadcast for distances of fewer than 5 miles (8 kilometers) in
cities and up to 20 miles (32 kilometers) in rural areas. The broadcast range
varies with the atmospheric conditions, the terrain, the design and height of
the set's antenna, and the amount of power supplied to the transmitter.
Government regulations in the United States and Canada limit the power of a CB
transmitter to a maximum of 4 watts. In both countries, CB radio has 40
channels, with frequencies of 26.965 to 27.405 megahertz. The Canadian CB is
called General Radio Service.
In
the United States, there are no licensing requirements for the operation of
citizens band radios. But Canada requires a CB transmitter of more than
one-tenth watt to be licensed. A Canadian citizen may obtain a General Radio
Service license from the nearest district office of the Department of
Communications.
Remote
controls for such devices as model airplanes and automatic garage-door openers
also operate on CB radio frequencies.
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