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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. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   Used for elevated base station antennas for land mobile radio systems such as police, ambulance, and taxi dispatchers. Mast radiator A radio tower in which the tower structure itself serves as the antenna. Common form of transmitting antenna for AM radio stations and other MF and LF transmitters.

4. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").

5. Police radio - Wikipedia

   en.wikipedia.org/wiki/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 .

6. AN/PRC-152 - Wikipedia

   en.wikipedia.org/wiki/AN/PRC-152

   The AN/PRC-152 radio began production in 2005. [4] Since then, over 100,000 have been provided to the US military. [5] The PRC-152 has been notably used by Prince Harry during his service with the British Army, then a 23-year-old second lieutenant in the Household Cavalry. He was responsible for providing cover for troops on the frontline as a ...

7. Professional mobile radio - Wikipedia

   en.wikipedia.org/wiki/Professional_mobile_radio

   "Ahoy" messages — Sent by the base station to demand a response from a particular radio unit. This may be sent to request the radio unit to send his unique identifier to ensure it should be taking traffic through the base station. Acknowledgments — These are sent by both the base stations and the mobile radio units to acknowledge the data sent.