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Global System Mobile. The world's most widely used land mobile digital cellular radio communications system. The system is currently used on the 900 MHz / 1800 MHz frequencies in Europe, Asia and Australia and the 1900 MHz frequency in North and Latin America.


Global Positioning System. A satellite-based navigation and positioning system.


Digital Audio Broadcasting. Uses interference effects such as high-rise buildings and weather conditions as reflectors, creating multipath reception conditions to optimise receiver sensitivity.


Very High Frequency/ Ultrahigh Frequency. Radio frequencies (300 to 3000 MHz) used for military air and ground communications.

  
Chip technology enabling seamless voice and data connections between a wide range of devices through short-range digital two-way radio. It is an open specification for short-range communications of
data and voice between both mobile and stationary devices.


Terrestrial Trunked Radio. A standard for digital, cellular and trunked radio networks which has been designed and developed notably as a mobile system for handling emergency and safety tasks.

    
   
 
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