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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 about police codes, numerical or alphanumerical abbreviations used by law enforcement over radio systems in the U.S. See examples of 10 codes, signals, incident codes, and other types of codes, and how they vary by state, county, and agency.
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 Los Angeles Police Department's organization, functions, and specialized units. Find out the list of LAPD community stations (patrol divisions), the types and features of LAPD vehicles, and the history of LAPD's paint scheme and markings.
Brevity codes are used in various communications to convey complex information with a few words or codes. Learn about different types of brevity codes, such as military, amateur radio, maritime, aviation and police codes.
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.
Learn about the various modes of radio communication used in the amateur radio hobby, from Morse code to digital voice to image and data. Compare the modulation types, operating protocols, and features of each mode.
An ARRL Numbered Radiogram is a brevity code used in composing ARRL Radiograms during times of radio congestion.. The code is used to transmit standard messages, sometimes with customized text, very quickly by experienced ARRL National Traffic System (NTS) message traffic handlers.