Technology advanced to make things workable using batteries, the stationary radio was improved to entertain as well as to communicate. Later on walkie talkie came into existence.
The commercial version of the hand held radio is used by the builders, transport service or in any wide spread site of any large business houses. When the PMR solution could not justify, DMR radio took over.
An exclusive portable radio used by the police force to remain connected to the head quarters as well as the force working in the field is police radio. Whether it improved the working of the police force or not is another issue.
Another variety is the two way radio. It has the ability to send and obtain messages. The handset permits the user to talk with others, who function from the same band. To match the changing trend the audio transceiver got modified to digital two way radio.The communicating mode used by men at sea, by both, the navy and commercial ships are the marine radio. Yet another form of the digital radio is the airport radio, used by the airport staff to contact the control room and the staff working in various sections of the airport.
To get equipped with modern technology and advanced communication trends India too started using the latest two way radio India.
Repeaters are used instead of more radios to increase the range of the radio systems. The efficient working of the telecommunications depends on the paths and connections used by the trunking system. A modification that follows the MPT specifications is MPT trunking.
Metro Communications would be the ideal location to look for all your needs to stay tuned with others. Here, you may find the exclusive tetra radio, an advanced trunked radio that is used by the various government offices, emergency help lines and other government services. Tetra uses 4 routes to work on TDMA mode, one of the most advanced technologies. You can also read more at http://digitalradios.jimdo.com/2012/07/09/development-of-digital-two-way-radios/
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