A cb radio (citizens band radio) is a two-way, short-range communication system that allows users to communicate over a specific channel. CB users often form clubs and create their own specialized language.
A variety of different types of vehicles can be equipped with a cb radio. Truck drivers often use them to stay up to date on road conditions and share information. Other users include motorcycle riders and outdoor enthusiasts. Using a cb radio can help people avoid getting lost when they are hiking or camping, and can be used for safety in emergencies when cellular networks are unavailable.
Historically, the 27 MHz frequency of the cb radio has been broadcast over a long distance by reflecting off charged particles in the ionosphere (skywave propagation). The frequency can be refracted to a higher or lower range depending on weather conditions. A cb radio with a good antenna can be heard across thousands of miles and even around the world.
Today, a mobile best cb radio is typically used in conjunction with an external, omnidirectional antenna that extends the radio’s range. Some antennas can be mounted on a vehicle, while others are installed at home or in a base station. A telescoping center-loaded antenna is a common choice for a mobile CB, although some operators prefer a continuously-loaded “rubber ducky” antenna that doesn’t require a ground plane. A cb radio can also be used with a PA transmitter that acts as a low-power public address system.
Most modern cb radios have 40 channels, with each corresponding to a distinct audio frequency. Each user must choose which channel they wish to transmit on, and only one radio can be active at a time. To prevent interference, a CB user must carefully tune their antenna to match the radio. This is usually done by measuring the Standing Wave Ratio, or SWR, and adjusting it until the ratio is close to 1:1.
In addition to channel selection, a cb radio has a variety of other features that make it useful for users. Many have automatic noise limiters that reduce the amount of ignition and power line noise that enters the signal. Some have channel scan that automatically selects a clear channel. A cb radio may also have a backlit display that makes it easier to read the settings and keys, particularly during bad weather or while driving at night.
Despite the popularity of other communication systems such as cellular phones and internet messaging, the cb radio remains popular among many groups of people. Many truckers use a cb radio to keep in contact with their crew and stay informed about road conditions and speed traps, while motorcycle riders use them to stay safe on the road. CBs are also popular among outdoor enthusiasts, who can use them in Jeeps and other off-road vehicles for navigating wilderness areas or during camping trips. People who frequently travel to remote or rural locations can also benefit from a cb radio, as they can easily communicate with their friends and family while on the go.