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  2. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    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 ...

  3. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    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-Safety Communications Officials-International (APCO), allow brevity and standardization of message traffic.

  4. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    Code 1: A time critical event with response requiring lights and siren. This usually is a known and going fire or a rescue incident. Code 2: Unused within the Country Fire Authority. Code 3: Non-urgent event, such as a previously extinguished fire or community service cases (such as animal rescue or changing of smoke alarm batteries for the ...

  5. Police radio - Wikipedia

    en.wikipedia.org/wiki/Police_radio

    Police radio systems historically used public radio frequencies, and listening to them was, for the most part, legal. Most modern police radio systems switched to encrypted radio systems in the 1990s and 2000s to prevent eavesdroppers from listening in.

  6. Here's why police scanner listeners can no longer hear York ...

    www.aol.com/heres-why-police-scanner-listeners...

    Individuals who listen to scanners to hear reports about crashes and crimes in York County have been wondering why local law enforcement calls suddenly cannot be heard anymore.

  7. Owensboro police encrypting scanner traffic; could Evansville ...

    www.aol.com/owensboro-police-encrypting-scanner...

    J.D. Winkler, the deputy chief of the Owensboro, Kentucky, police department, cited that reason and others earlier this year when the Owensboro Police Department and other local first responders ...

  8. APCO radiotelephony spelling alphabet - Wikipedia

    en.wikipedia.org/wiki/APCO_radiotelephony...

    The APCO phonetic alphabet, a.k.a. LAPD radio alphabet, is the term for an old competing spelling alphabet to the ICAO radiotelephony alphabet, defined by the Association of Public-Safety Communications Officials-International [1] from 1941 to 1974, that is used by the Los Angeles Police Department (LAPD) and other local and state law enforcement agencies across the state of California and ...

  9. Voice-activated radio-dispatched alarm - Wikipedia

    en.wikipedia.org/wiki/Voice-activated_radio...

    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. [1] In 1968, the voice-activated radio dispatched alarm (VARDA), was invented.