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A PoC radio (short for push to talk over cellular radio [2]), also known as PTToC radio, [3] is an instant communication device that is based on the cellular network. [4] It is a radio device that incorporates push-to-talk technology into a cellular radio handset. [5]
Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. 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 ...
SPOT is a GPS tracking device that uses the Globalstar satellite network [1] to provide text messaging and GPS tracking (depending on the subscription type purchased). [ 2 ] [ 3 ] It has a coverage area that includes a large portion of the planet, with the exception of extreme northern and southern latitudes and parts of the Pacific Ocean. [ 4 ]
One system is known as the PED System, where PED is an acronym for personal emergency device. [11] Initially developed after a mining disaster in Australia at Moura No. 4 Coal Mine in 1986, [ 12 ] and further developed after the Moura No. 2 Coal Mine explosion in 1994 [ 13 ] where the need for a communication system to survive major incidents ...
VHF signals are either received by mobile or stationary receivers equipped with directional antennae. The location of the transmitter can then be determined by acquiring the transmissions from three (or more) different locations to triangulate the location of the device. VHF tracking is more commonly known as "radio-tracking."
Typical walkie-talkies resemble a telephone handset, with a speaker built into one end and a microphone in the other (in some devices the speaker also is used as the microphone) and an antenna mounted on the top of the unit. They are held up to the face to talk. A walkie-talkie is a half-duplex communication device. Multiple walkie-talkies use ...
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AN/TRC-97 Troposcatter Communication System AN/TRC-170 Tropospheric Scatter Microwave Radio Terminal [21] AN/GRC-201 Troposcatter Communication System US Army TRC-170 Tropo Scatter Microwave System. The U.S. Army and Air Force use tactical tropospheric scatter systems developed by Raytheon for long haul communications. The systems come in two ...
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