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  2. Comparison of radio systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_radio_systems

    World radio systems (Terrestrial) System Type Modulation Data rate Sidebands? Ch. Bandwidth Radio spectrum Sound Codec Digital subchannels SFN Metadata/RDS/RBDS; AM radio: Analog radio: Amplitude Modulation: N/A? 18–20 kHz: 148.5-283.5 kHz (Longwave) 510–1610 kHz (Europe) 510–1710 kHz (USA and Canada) N/A: N/A: No: None Motorola C-QUAM ...

  3. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    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 ...

  4. Baofeng UV-5R - Wikipedia

    en.wikipedia.org/wiki/Baofeng_UV-5R

    The Baofeng UV-5R has been produced since 2012 and exported to markets worldwide. The controversial radio had no FCC Part 95 certification [4] in the United States. As a result, it was not authorized for use in the GMRS and FRS, only for amateur radio. [5] [6] Baofeng launched a number of other models based on the UV-5R technology, since 2012.

  5. 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 ...

  6. Citizens band radio - Wikipedia

    en.wikipedia.org/wiki/Citizens_band_radio

    Citizens band radio (CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.

  7. 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 ...