CB Radio

Citizens' Band radio (CB) is, in most countries, a system of short-distance radio communication between individuals on a selection of 40 channels within the single 27 MHz (11 meter) band. The CB radio service should not be confused with FRS, GMRS, MURS, or amateur radio. more...

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Similar personal radio services exist in other countries, with varying requirements for licensing and differing technical standards. In many countries, CB does not require a license and, unlike amateur radio, it may be used for commercial communication.

Scope

The Citizens' Band radio service in the United States is one of several personal radio services regulated by the FCC. These services began in 1945 to permit citizens a short-distance radio band for personal communication (e.g., radio controlled models, family communications, individual businesses). Originally, CB was located in the 460-470 MHz UHF band. There were two classes of CB: A and B. Class B radios had simpler technical requirements but were limited to a smaller range of frequencies.

At the time, the technology was not advanced enough to make a UHF radio practical for the average consumer. So, in 1958, the Class D CB service was opened at 27 MHz, and this is what is popularly known as CB. Previously, this was a government band (primary allocation to US Forest service, military, etc.) with a secondary allocation for the amateur radio service.

Most of the 460-470 MHz band was reassigned for business and public safety uses, but Class A CB is the ancestor of the present General Mobile Radio Service GMRS. Class B, in the same vein, is a more distant ancestor of the Family Radio Service. The Multi-Use Radio Service is another two-way radio service, in the VHF high band. An unsuccessful petition was made in 1973 to create a Class E CB service at 220 MHz, this was opposed by amateur radio organizations and others. There are several other classes of personal radio services for specialized purposes such as remote control devices.

While parts of this article are specific to the United States, several countries have similar radio services. While they may be known by other names, they often use similar frequencies (26 to 28 MHz), and have similar uses. Licenses may or may not be required, but eligibility is generally simple.

On the other hand, some foreign personal radio services, such as the European PMR446 and the Australian UHF CB, are more similar to the American FRS or GMRS services than the CB service and so are not covered in this article.

History

In the 1960s, the service was popular for small trade businesses (e.g., electricians, plumbers, carpenters) and transportation services (e.g., taxi and trucking firms). "10 codes" originally used in the public service (e.g., police, fire, ambulance) and land mobile service were used for short acknowledgments. With the advancement of solid state technology (transistors replacing tubes) in the 1970s, the weight, size, and cost of the radios decreased. US truckers were at the head of the boom. Many CB clubs were formed, and a special CB slang language evolved. The prominent use of CB radios in mid- and late-1970s films (see list below), television shows such as The Dukes of Hazzard (debuted 1979), and in popular novelty songs such as C.W. McCall's "Convoy" (1976) helped to establish the radios as a nationwide craze in America from the mid-1970s to the early 1980s.

Read more at Wikipedia.org