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  2. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    This requires either two separate radio channels or channel sharing methods such as time-division duplex (TDD) to carry the two directions of the conversation simultaneously on a single radio frequency. [2] The first two-way radio was an AM-only device introduced by the Galvin Manufacturing Corporation in 1940 for use by the police and military ...

  3. General Mobile Radio Service - Wikipedia

    en.wikipedia.org/wiki/General_Mobile_Radio_Service

    TIDRADIO TD-H5 GMRS radios. The General Mobile Radio Service (GMRS) is a land-mobile FM UHF radio service designed for short-range two-way voice communication and authorized under part 95 of the US FCC code. It requires a license in the United States, but some GMRS compatible equipment can be used license-free in Canada. The US GMRS license is ...

  4. Trunked radio system - Wikipedia

    en.wikipedia.org/wiki/Trunked_radio_system

    A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...

  5. 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 ...

  6. Multi-Use Radio Service - Wikipedia

    en.wikipedia.org/wiki/Multi-Use_Radio_Service

    To make MURS two-way radios work together, they must have matching CTCSS or DCS tones. This can usually be done via basic programming which almost all MURS two-way radios support. The goTenna, a digital radio product, operates on the MURS band and pairs with smartphones to enable users to send texts and share locations on a peer-to-peer basis ...

  7. PMR446 - Wikipedia

    en.wikipedia.org/wiki/PMR446

    Motorola TA288 PMR446 licence-free radio Motorola TLKR T40 radio tuned to PMR channel 1. PMR446 (Private Mobile Radio, 446 MHz) is a licence-exempt service or UHF CB in the UHF radio frequency band, as personal radio service or citizens band radio, and is available for business and personal use in most countries throughout the European Union, [1] Malaysia, [2] and Singapore.

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