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A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or other status ...
Certain agencies may add or remove certain codes. For example, in the Los Angeles Police Department 's radio procedures, Code 1 is not a response code, and its meaning is transferred to Code 2, the original meaning of which is transferred to the semi-official response code "Code 2-High".
Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.[1] The codes, developed during 1937–1940 and expanded in 1974 by the Association of Public ...
Home Office radio was the VHF and UHF radio service provided by the British government to its prison service, emergency service (police, ambulance and fire brigade) and Home Defence agencies from around 1939.
A voice-activated radio-dispatched alarm, or VARDA-alarm, is a type of burglar alarm that, when activated or "tripped", broadcasts the type of the alarm and the transmitter location over the local police radio frequency using a pre-recorded audio message.
In 1970, Farmville Police department in North Carolina, United States, reported about their implementation of the all-points bulletin (APB) system beginning in 1968. [1] If a stolen car was reported, officers would send out a radio broadcast to all patrol cars and to various other stations within a certain radius.
Radiotelephony procedure (also on-air protocol and voice procedure) includes various techniques used to clarify, simplify and standardize spoken communications over two-way radios, in use by the armed forces, in civil aviation, police and fire dispatching systems, citizens' band radio (CB), and amateur radio. Voice procedure communications are ...
Police radio is a radio system used by police and other law enforcement agencies to communicate with one another. Police radio systems almost always use two-way radio systems to allow for communications between police officers and dispatchers. Most modern police radio systems are encrypted, and many jurisdictions have made listening to police ...