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  2. Police radio - Wikipedia

    en.wikipedia.org/wiki/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 .

  3. Radar detector - Wikipedia

    en.wikipedia.org/wiki/Radar_detector

    And Jamming a police radio device is punishable by up to 10 years in prison under the Radio Act Article 82. Spain: Radar Detectors illegal, jammers illegal. Radar and Laser jammers fine up to €6000. Radar detectors fine up to 3 points from the driving license and €200. [32] Ka narrow, laser, Autovelox Switzerland

  4. Radar detector detector - Wikipedia

    en.wikipedia.org/wiki/Radar_detector_detector

    A radar detector detector (RDD) is a device used by police or law enforcement in areas where radar detectors are declared illegal. Radar detectors are built around a superheterodyne receiver , which has a local oscillator that radiates slightly.

  5. Detector (radio) - Wikipedia

    en.wikipedia.org/wiki/Detector_(radio)

    A coherer detector, useful only for Morse code signals. In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first three decades of radio (1888–1918).

  6. 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 ...

  7. 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.