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  2. Walkie-talkie - Wikipedia

    en.wikipedia.org/wiki/Walkie-talkie

    A walkie-talkie, more formally known as a handheld transceiver, HT, or handheld radio, is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, Henryk Magnuski and engineering teams at Motorola. First used for infantry, similar ...

  3. Motorola DynaTAC - Wikipedia

    en.wikipedia.org/wiki/Motorola_DynaTAC

    Electrical engineer Martin Cooper of Motorola made the first publicized handheld mobile phone call on a prototype DynaTAC model on April 3, 1973. This is a reenactment in 2007. The DynaTAC is a series of cellular telephones manufactured by Motorola from 1983 to 1994. The Motorola DynaTAC 8000X received approval from the U.S. FCC on September 21 ...

  4. SCR-536 - Wikipedia

    en.wikipedia.org/wiki/SCR-536

    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]

  5. Family Radio Service - Wikipedia

    en.wikipedia.org/wiki/Family_Radio_Service

    Motorola T5320 FRS handheld radio. The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies around 462 and 467 MHz in the ultra high frequency (UHF) band.

  6. Continuous Tone-Coded Squelch System - Wikipedia

    en.wikipedia.org/wiki/Continuous_Tone-Coded...

    The NATO Military radios use 150.0 Hz, and this can be found in the user manuals for the radios. Some areas do not use certain tones. For example, the tone of 100.0 Hz is avoided in the United Kingdom since this is twice the UK mains power line frequency; an inadequately smoothed power supply may cause unwanted squelch opening (this is true in ...

  7. RadioShack - Wikipedia

    en.wikipedia.org/wiki/RadioShack

    RadioShack (formerly written as Radio Shack) is an American electronics retailer that was established in 1921 as an amateur radio mail-order business. Its original parent company, Radio Shack Corporation, was purchased by Tandy Corporation in 1962, shifting its focus from radio equipment to hobbyist electronic components sold in retail stores ...