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2. Project 25 - Wikipedia

   en.wikipedia.org/wiki/Project_25

   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] P25 radios are a direct replacement for analog UHF (typically ...

3. Two-way radio - Wikipedia

   en.wikipedia.org/wiki/Two-way_radio

   A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves ), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver, which only receives transmissions. Two-way radios usually use a half-duplex communication channel ...

4. Emergency communication system - Wikipedia

   en.wikipedia.org/wiki/Emergency_Communication_System

   Additionally, many non-professionals may use unlicensed two-way radios, as is common with CB radio, Family Radio Service or PMR446. Weather Radio; A weather radio is a device which receives normal and emergency weather broadcasts. It may automatically turn on whenever an emergency is eminent or occurring, providing an alarm as well as a ...

5. Communication during the September 11 attacks - Wikipedia

   en.wikipedia.org/wiki/Communication_during_the...

   In practice, many US helicopters used in emergency services are equipped with radios that allow communications on nearly any conventional two-way radio system, so long as the aircrew know the frequency and associated signaling tones. The radios usually have presets, like a car's broadcast radio, that allow some channels to be configured ahead ...

6. Radiotelephony procedure - Wikipedia

   en.wikipedia.org/wiki/Radiotelephony_procedure

   Radiotelephony procedure. Radiotelephony procedure (also on-air protocol and voice procedure) includes various techniques used to clarify, simplify and standardize spoken communications over two-way radios, in use by the armed forces, in civil aviation, police and fire dispatching systems, citizens' band radio (CB), and amateur radio .

7. Amateur radio emergency communications - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_emergency...

   Amateur radio emergency communications. Solar-powered Amateur Radio Station in tents. Note the portable VHF / UHF satellite and HF antennas in the background. In times of crisis and natural disasters, amateur radio is often used as a means of emergency communication when wireline, cell phones and other conventional means of communications fail.