Two-Way Communications

Any World War II movie will have at least one scene where the American troops are calling for air support or artillery via a backpacked walkie-talkie. The later handheld (barely) radio, officially known as a Handie-Talkie, was a staple both in war and in war movies, all the way through the Korean and Vietnamese conflicts. Even one of the earliest cell phones, the Motorola DynaTEC, circa 1985, took its form factor from the Motorola Handie-Talkie of the 1940s.

A walkie-talkie is a half-duplex communication device. Multiple walkie-talkies use a single radio channel, and only one radio on the channel can transmit at

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