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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).
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.
Learn about the history, features and uses of CB radio, a land mobile radio system for short-distance voice communication. Find out how CB radios operate on 27 MHz band and have a range of about 5 km to 30 km depending on terrain.
Learn about the history, eligibility, operation, and channel assignments of citizens band radio (CB radio) in the US. Find out the frequencies, typical uses, and exceptions for the 40 CB channels from 26.965 to 27.405 MHz.
Learn about the history and usage of the International Code of Signals, a system of flags and codes for maritime communication. The code includes a standardized alphabet and numerals, as well as messages for safety of navigation and related matters.
Learn about the FCC-issued licenses to operate amateur stations for personal use, the classes, privileges, exams and history of amateur radio in the US. Find out how to become a volunteer examiner and access the online database of licenses.
Learn about the history, conventions and formats of call signs used by radio and television stations in different countries of North America. Find out the prefixes, suffixes and examples of call signs for each region and band.
Learn about the identifiers assigned to radio and TV stations by the FCC and NTIA, and how they reflect slogans, owners, locations, and numbers. Find out which stations have the same call letters for 100 years or more, and which ones have changed many times.