A two-way radio is a radio that can both transmit and receive a signal
(a transceiver), unlike a broadcast receiver which only receives content. It is
an audio (sound) transceiver designed for bidirectional person-to-person voice
communication with other users with similar radios using the same radio
frequency (channel). Two-way radios are available in mobile, stationary base
and hand-held portable configurations. Hand-held two-way radios are often
called walkie-talkies, handie-talkies or hand-helds.
Two-way radio systems usually operate in a half-duplex mode; that is,
the operator can talk, or he can listen, but not at the same time. A
push-to-talk or Press To Transmit button activates the transmitter; when it is
released the receiver is active. Other Full-duplex is generally achieved by the
use of two different frequencies or by frequency-sharing methods to carry the
two directions of the conversation simultaneously.[1] Methods for mitigating
the self interference caused by simultaneous transmission and reception on
different but close-spaced frequencies include using two antennas,[2] or
dynamic solid-state filters.[3] Time-division technologies (such as TDD) are
used for mitigating self interference by simultaneous transmission and
reception on the same frequency.
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