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2. Citizen (app) - Wikipedia

   en.wikipedia.org/wiki/Citizen_(app)

   He thought about the modern, invisible signals of wireless calls, Wi-Fi and police radio darting through the 19th-century buildings." Vigilante was backed by a seed round of $1 million, led by Founders Fund. The Vigilante app was released to New York City, in the App Store on October 26, 2016.

3. 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 ...

4. 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 ...

5. 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 ...

6. Johnson County police to encrypt radio scanners, sparking ...

   www.aol.com/johnson-county-police-encrypt-radio...

   January 11, 2024 at 6:02 AM. “Beginning on January 23, 2024, the following Johnson County police agencies will begin full encryption of their radio communications.”. So began a media release ...

7. Citizens band radio - Wikipedia

   en.wikipedia.org/wiki/Citizens_band_radio

   Cobra 50 WX ST Handheld CB Radio. Citizens band radio ( CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band. Citizens band is distinct from other ...