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  2. Radio scanner - Wikipedia

    en.wikipedia.org/wiki/Radio_scanner

    A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases. The term scanner generally refers to a communications receiver that is ...

  3. Police radio - Wikipedia

    en.wikipedia.org/wiki/Police_radio

    Police radio. 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 ...

  4. Let the city listen: The NYPD should keep police radio ...

    www.aol.com/let-city-listen-nypd-keep-080000195.html

    The NYPD has begun encrypting scanner radios that the press and the public have used to monitor basic police communications for more than 90 years. While the desire to put such communications on ...

  5. NYPD Will Spend Nearly $400 Million to Hide its Radio ... - AOL

    www.aol.com/news/nypd-spend-nearly-400-million...

    NYPD radio frequencies have been open to the public since 1932. A new encrypted system will end that. NYPD Will Spend Nearly $400 Million to Hide its Radio Communications

  6. Radio-frequency identification - Wikipedia

    en.wikipedia.org/wiki/Radio-frequency_identification

    Radio-frequency identification ( RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver, and a transmitter. When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits ...

  7. Trunked radio system - Wikipedia

    en.wikipedia.org/wiki/Trunked_radio_system

    A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...

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