What Is Two-Way Radio?
The working principle of two-way radio is to convert audio into radio waves and then transmit them through the air. These radio waves are received by other radios and then converted into audio.
The conversion to radio waves can be sent as an analog signal or a digital signal, and digital transmission is a more modern technology. With digital radio, other types of data, such as text messages and status updates, can be sent over radio waves. You can even encrypt data when using digital radio to prevent people from using your network without your permission.
A two-way radio is a radio (transceiver) that can both transmit and receive radio waves, unlike broadcast receivers that can only receive content. It is an audio (sound) transceiver, a transmitter and receiver in one unit, used for two-way human-to-human voice communication with other users using similar radios. Two-way radios can be used in fixed (base station), mobile (mounted on a vehicle) and handheld portable modes. Hand-held two-way radios are usually called walkie-talkies, walk-behind walkie-talkies, or hand-held walkie-talkies. Two-way radio use groups geographically separated people need to maintain continuous voice communication, such as airplane pilots and air traffic controllers, captains and regulars, emergency services such as firefighters, police, ambulance medical personnel, taxis and delivery services, soldiers and military units, fast food and warehouse employees, and radio amateurs.
A two-way radio system usually uses a single radio channel and adopts a half-duplex mode: only one user can send information on the same channel, so users in the user group must take turns to talk. The radio is usually in receive mode, so the user can hear all other transmissions on the channel. When the user wants to talk, he needs to press the "push-to-talk" button, turn off the receiver, and turn on the transmitter; when he releases the button, the receiver is activated again. Multiple channels are provided so that different user groups can communicate in the same area without interfering with each other. Other two-way radio systems operate in full-duplex mode, in which both parties can talk at the same time. This requires two separate radio channels or channel sharing methods, such as Time Division Duplex (TDD), which simultaneously transmits conversations in two directions on one radio frequency. A cell phone is an example of a full-duplex two-way radio. During the phone call, the phone communicates with the cell phone tower over two radio channels; the incoming one to carry the remote party’s voice to the user, and the outgoing one to carry the user's voice to the remote party.
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