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Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...
Typical walkie-talkies resemble a telephone handset, with a speaker built into one end and a microphone in the other (in some devices the speaker also is used as the microphone) and an antenna mounted on the top of the unit. They are held up to the face to talk. A walkie-talkie is a half-duplex communication device. Multiple walkie-talkies use ...
Depending on the set a range of communication facilities were available consisting of voice and/or teletype and Hellscriber. Range was line-or-sight so the ranges reported here were assuming the antenna could "see" one another. [4] [5] DMG 2 T: Pack unit, operating on the 475 - 525 MHz band, single channel voice or 800 character-per-second ...
An example of a half-duplex system is a two-party system such as a walkie-talkie, wherein one must say "over" or another previously designated keyword to indicate the end of transmission, to ensure that only one party transmits at a time. A good analogy for a half-duplex system would be a one-lane road that allows two-way traffic, traffic can ...
The SCR-536 is often considered the first of modern hand-held, self-contained, "handie talkie" transceivers (two-way radios). It was developed in 1940 by a team led by Don Mitchell, chief engineer for Galvin Manufacturing (now Motorola Solutions) and was the first true hand-held unit to see widespread use. [1]
Digital Simple Radio (デジタル簡易無線, dejitaru kan'i musenkyoku) covers 351 MHz UHF digital service for leisure and business use. Radios must be registered and equipped with a built-in control ROM for automatic digital callsign identification. 351.16875–351.19375 MHz, digital voice and data, 1 watt, 5 channels, 6.25 kHz spacing
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