Walkie talkie radios
The ‘hand-held trans receiver' or as it is popularly called was developed by two engineers during world war-2 for communication on the war field. After the second world war was over, the invention slowly spread to commercial places, armed forces and field of work.
Major characteristics of include a half-duplex channel mode of communication where only one way of communication is possible. At a time , one person can talk and others can listen. There is a Push To Talk (PTT) facility which is available for people to assign priority among the speakers. is commonly used by traffic policemen on the roads to transmit traffic information between two places. The first was developed by Motorola and even now continues to be the lead in introducing newer models. Every device comes with a talk band. It is the distance which is supported by the . Some advanced models support distances of 5km up to 20 km.
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With cell phones having dominated the communication market, applications may look to be shrinking. However, these have some disticnt advantages over the cell phones. They were designed to be used in critical situations and hence their signal strength is very strong. They can be conveniently used during severe storms and bad weather conditions also with equal ease. A cell phone might not be that useful when there is a natural calamity. Hence,in applications where safety and security are mandatory, are a must and are far better than mobile devices.
An advancement in the device is that it has been made into a two-way device. There is a dual channel in which simultaneous transmission and reception is possible. It is also been called a ‘two-way talking radio'. Walkie-talkie's of today come as a package. For instance, one model comes with an emergency powering mode with a hand crank, flash light, clock with an alarm etc. This unit as a whole with the main walkie-talkie with the accessories is very useful for people in rescue operations or in traffic or controlling vehicular movement in a huge campus.
Operation of a is very simple. For two people to communicate, their radios should be set at the same frequency. Then at a time one can talk and the other can listen. For group discussions, again the group has to be created using the same frequency. The technique of Push To Talk can be employed when a group of people are talking.
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