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January 21, 2019
A group of people who are using walkie-talkies to talk to one another have to tune in to the same frequency band, which is called a channel.
Their radios are all "receiving," so their microphone/loudspeaker units are working as loudspeakers and probably hissing with static, a bit like a conventional radio that's not tuned into any particular station.
When someone wants to to talk to the others, they hold the push-to-talk button on their handset.
Their radio goes quiet as their loudspeaker switches over to a microphone.
As they talk into it, their words are converted into radio waves and beamed out on the prearranged channel (typically at a frequency around 460 MHz). Since radio waves are part of the electromagnetic spectrum, they travel at the speed of light (300,000 km/second or 186,000 miles/second ),
so the waves are picked up almost instantaneously by the other handsets.
The radio waves are converted back into fluctuating electric currents and the loudspeakers use those to reproduce the sound of the talker's voice. When the talker has finished, he or she says "over" (meaning my bit of talking is finished) and releases the push-to-talk button.
The radio now switches back into listening mode and someone else can talk.
Unlike a normal radio, which will only pick up broadcast voices or music from a radio station, a walkie-talkie is a two-way radio: you can both talk and listen (send and receive).
The main drawback is that the same frequency channel is used for both things, so only one person can talk at a time.
When communication devices work this way, they're described as half-duplex (a single channel allows communication in only one direction at any one time), as opposed to full-duplex (where you can talk and listen at the same time, as on a telephone).