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Ten-codes are abbreviated phrases used by public safety officials and CB radio enthusiasts to communicate quickly and clearly. Learn about the history, meaning and usage of ten-codes, such as 10-4 (understood), 10-33 (officer needs help) and 10-7 (out of service).
FRS is a walkie-talkie radio system in the UHF band authorized in the US since 1996. It uses 22 channels shared with GMRS, and has power limits, tone codes, and certification requirements.
Learn about the different types and examples of police codes used in the United States, such as 10 codes, signals, incident codes, and response codes. See how codes vary by state, county, and agency, and how they are related to the California Penal Code.
Learn the history and meaning of CB slang, the distinctive anti-language used by truck drivers and CB radio users. Find out what "10-4 good buddy" means and other terms for law enforcement, trucks and other vehicles.
A walkie-talkie is a hand-held, portable, two-way radio transceiver that allows half-duplex communication. Learn about its development during World War II, its features and applications, and its classification as radio station / land mobile station.
CTCSS stands for Continuous Tone-Coded Squelch System, a type of in-band signaling that reduces interference on shared radio channels. It uses low frequency audio tones to mute or unmute receivers depending on the CTCSS code used by the transmitter.
Learn about the concept, history, and types of two-way radio, a radio transceiver that can both transmit and receive radio waves. Find out how two-way radio systems work, how they are classified, and how they are used for various purposes.
Learn about the different formats and codes for reporting the strength and quality of radio signals and voice communications. The R-S-T system uses 1 to 5 for readability and 1 to 9 for signal strength, while the SINPO and SINPEMFO codes use 1 to 5 for each factor.