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  2. List of radio stations in Alabama - 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 Alabama, which can be sorted by their call signs, frequencies, cities of license, licensees, and programming formats. List of radio stations

  3. 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 .

  4. Police radio code - Wikipedia

    en.wikipedia.org/wiki/Police_radio_code

    A police radio 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 ...

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  6. List of law enforcement agencies in Alabama - Wikipedia

    en.wikipedia.org/wiki/List_of_law_enforcement...

    This is a list of law enforcement agencies in the U.S. state of Alabama.. According to the US Bureau of Justice Statistics' 2008 Census of State and Local Law Enforcement Agencies, the state had 417 law enforcement agencies employing 11,631 sworn police officers, about 251 for each 100,000 residents.

  7. Business band - Wikipedia

    en.wikipedia.org/wiki/Business_band

    In the United States, the business band is the colloquial name used by radio users who utilize and scanner hobbyists who listen to the Federal Communications Commission (FCC) Industrial/Business pool frequencies. The regulations listing frequencies in this pool are contained in Subpart C of Part 90, Title 47 of the CFR.

  8. Project 25 - Wikipedia

    en.wikipedia.org/wiki/Project_25

    Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]

  9. 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 ...