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2. 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]

3. Professional mobile radio - Wikipedia

   en.wikipedia.org/wiki/Professional_mobile_radio

   PMR systems are based on such standards as MPT-1327, TETRA, APCO 25, and DMR which are designed for dedicated use by specific organizations, or standards such as NXDN intended for general commercial use. These systems are used by police, fire, ambulance, and emergency services, and by commercial firms such as taxis and delivery services.

4. Radio repeater - Wikipedia

   en.wikipedia.org/wiki/Radio_repeater

   In a shared system, a receive antenna is usually located at the top of the antenna tower. Putting the receive antenna at the top helps to capture weaker received signals than if the receive antenna were lower of the two. By splitting the received signal from the antenna, many receivers can work satisfactorily from a single antenna.

5. Trunked radio system - Wikipedia

   en.wikipedia.org/wiki/Trunked_radio_system

   In essence, a trunked radio system is a packet switching computer network. Users' radios send data packets to a computer, operating on a dedicated frequency — called a control channel — to request communication on a specific talkgroup.

6. Stingray phone tracker - Wikipedia

   en.wikipedia.org/wiki/Stingray_phone_tracker

   The Stingray acts as a cellular tower to send out signals to get the specific device to connect to it. Cell phones are programmed to connect with the cellular tower offering the best signal. When the phone and Stingray connect, the computer system determines the strength of the signal and thus the distance to the device.

7. Statewide government trunked radio systems in Australia

   en.wikipedia.org/wiki/Statewide_government_trunk...

   The Western Australia Police Radio Network is an encrypted Project 25 (APCO-25) Phase 1 digital trunked radio system operating in Western Australia. The network commenced operation in 2011, and currently provides coverage to 20,000 square kilometres around Perth , and 25,000 square kilometres around regional areas, equating to 95% of the WA ...