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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. Cromwell Radio Group - Wikipedia

   en.wikipedia.org/wiki/Cromwell_Radio_Group

   Cromwell Radio Group was founded in 1969 when Bayard H. "Bud" Walters (still company president today) applied to the Federal Communications Commission for permit to construct WKCM, a country-formatted AM station in Hawesville, Kentucky. That station, which went on the air in November 1972, is still owned by Cromwell today.

4. List of channel numbers assigned to FM frequencies in North ...

   en.wikipedia.org/wiki/List_of_channel_numbers...

   In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.

5. 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 .

6. 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]

7. 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 ...

8. Trunked radio system - Wikipedia

   en.wikipedia.org/wiki/Trunked_radio_system

   Trunked radio takes advantage of the probability that with any given number of users, not everyone will need channel access at the same time, therefore fewer discrete radio channels are required. From another perspective, with a given number of radio channels, a much greater number of user groups can be accommodated.

9. Ten-code - Wikipedia

   en.wikipedia.org/wiki/Ten-code

   The development of the APCO Ten Signals began in 1937 [5] to reduce use of speech on the radio at a time when police radio channels were limited. Credit for inventing the codes goes to Charles "Charlie" Hopper, communications director for the Illinois State Police , District 10 in Pesotum, Illinois .