What is Citizen Band radio and what are Its Uses?
The Citizen's Band Radio Service, also known simply as CB, is a public, two-way personal radio service. Mobile CB operation, especially in cars and trucks, are the most popular.
CB stands for "Citizen's Band" radio. It got that name because its main idea is to be a kind of radio service anyone can use. Depending on the country you live in, it is either a minimally-regulated or an unregulated set of radio channels used for short-range (local) communications. Many people use CB radios in their vehicles, homes or both.
Citizen's Band refers to a range of radio frequencies that lie between the short-wave broadcast signals and the 10-meter Amateur radio bands. These frequencies are divided into 40 channel starting from 26.965 MHz up to 27.405 MHz in 10 KHz steps.
(Citizens Band) Radio is an unlicensed service. Since the early 1980's, the FCC
stopped requiring licenses for USA CB radio use. Users must still abide by all
the FCC rules regarding the CB Band, however. The maximum allowable power for a
CB radio is 4 watts (mandated by FCC). Repeaters are not allowed on CB radio.
A few CB's may seem to claim 5, or even "7 watts of output" on the box. This is misleading, it actually refers to the Audio power sent to it's built in speaker, "input" power, or some other nonsense that has nothing to do with the actual transmit output to the antenna, which is still 4w or less in that radio.]
A citizens band (CB) radio antenna is a device designed to do two things: It captures radio-frequency signals that are then converted to electrical signals by the receiver, and it takes electrical signals from the transmitter and converts them into radio-frequency signals. This second function is where tuning comes into play, because an antenna has to radiate radio-frequency signals, something that's done best when the length of the antenna precisely matches the wavelength of the transmitted radio frequency.
It is a radio system that is for the personal use of radio equipment. It is for local and national communications, and in some cases, internationally. It is not intended for commercial use, some communities use it as local town security where the police monitor a channel for citizen emergency calls. Some countries restrict communication distance by law!The CB Radio Service has proven useful in disaster situations, both small-scale (for example, for a stranded motorist) and large-scale (such as after a hurricane or during a flash flood). An organization of expert communicators known as the Radio Emergency Associated Communications Teams (REACT) provides communications support in emergency situations. Channel 9 (at 27.065 MHz) is monitored by members of REACT, and is recognized as the CB emergency channel in the United States.
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ABOUT THE AUTHOR
This particular article was organized by Devang Kakkad who frequently shares knowledge on the subject areas of technology and communication. He has also written detailed reviews of the best two way radios out there. He recently published his review on Cobra CB Radios.