A SURVEY PAPER ON HALF DUPLEX COMMUNICATION DEVICE
Kakad Pallavi Changdeo, Sawai Priti Kakasaheb, Handore Kanchan Gorakh, Pansare Pooja Khandu, Kishore Reddy · International journal of advance research and innovative ideas in education · 2019
Walkie talkie is a kind of communication system which provides services one-to-one and one-to-many. A walkie-talkie is a half-duplex communication device; several number of walkie talkies use a single radio channel, at a time only one radio can transmit signal on a channel, even though any number can listen. Normally the transceiver is in receive mode; when the user wants to talk he presses a ”push-to-talk” (PTT) button that turns off the receiver and turns on the transmitter. They communicate with each other using wireless frequency band. Typical walkie-talkies correspond to a cellular phone, possibly slightly larger but still a single unit, with an antenna mounted on the top of the unit. Where a phone’s earpiece is only loud enough to be heard by the user, a walkie-talkie’s built-in speaker can be heard by the user and those in the user’s immediate neighboring. Walkie-talkie transceivers may be used to communicate between each other, or to vehicle-mounted or base stations. In our system we increases the communication distance between two devices.