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Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications. In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location. In radio navigation systems such as GPS and VOR, a mobile receiver accepts radio signals from navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device.
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US 2x Baofeng UV-5R Dual-Band V/UHF FM Transceiver Ham Two-way Radio Scanner
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Retekess V-115 FM/AM/SW Radio Multiband Receiver REC Recorder MP3 Player Timer
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Wireless Bluetooth Receiver 3.5mm AUX Audio Stereo Music Home Car Adapter TO
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Insignia- AM/FM Radio Portable CD Boombox with Bluetooth - Silver/Black
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Sony SRS-XG500 X-Series Wireless Portable-Bluetooth Party-Speaker
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Tecsun PL880 PLL Dual Conversion AM FM Shortwave Portable Radio with SSB - Black
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Car Radio Stereo Bluetooth Audio Music MP3 Player FM AUX USB With Remote Control
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Blink Outdoor Wireless, Weather Resistant HD Security Camera with 2 Year Battery
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