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  2. List of radio stations in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/List_of_radio_stations_in...

    The following is a list of FCC-licensed radio stations in the U.S. state of Pennsylvania, which can be sorted by their call signs, frequencies, cities of license, licensees, and programming formats. List of radio stations

  3. 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.

  4. Police radio - Wikipedia

    en.wikipedia.org/wiki/Police_radio

    The first police radio systems were implemented in Detroit in 1928, when the Detroit Police Department set up a one-way radio system to broadcast crime information to police cars. [2] The frequency was assigned the call sign "KOP" by the Federal Communications Commission .

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

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

    The York County Chiefs of Police Association discussed with York County making the police calls private to protect the personal information that was broadcast over the radio, said Ted Czech ...

  6. 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 ...

  7. The Secret Service and local police were in different command posts at a Trump rally in Pennsylvania and didn't have access to the same radio traffic when word of a gunman came in, the federal ...