Portal:Radio
The Radio Portal Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 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 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. (Full article...) Selected article -The Hitchhiker's Guide to the Galaxy is a science fiction comedy radio series primarily written by Douglas Adams. It was originally broadcast in the United Kingdom by BBC Radio 4 in 1978, and afterwards the BBC World Service, National Public Radio in the US and CBC Radio in Canada. The series was the first radio comedy programme to be produced in stereo, and was innovative in its use of music and sound effects, winning a number of awards. The series follows the adventures of hapless Englishman Arthur Dent and his friend Ford Prefect, an alien who writes for The Hitchhiker's Guide to the Galaxy, a pan-galactic encyclopaedia and travel guide. After Earth is destroyed in the first episode, Arthur and Ford find themselves aboard a stolen spaceship piloted by Zaphod Beeblebrox (Ford's semi-cousin and Galactic President), depressed robot Marvin, and Trillian, the only other human survivor of Earth's destruction. (Full article...)General images -The following are images from various radio-related articles on Wikipedia.
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Radio Radio by country Radio by medium Radio theme songs Radio by period Works about radio Radio-related lists Radio astronomy Radio broadcasting Radio communications Radio control Radio geopositioning History of radio Radio hobbies Military radio systems Models of radios Nicknames in radio Radio organizations Radio paging Radio regulations Radio technology Trunked radio systems Types of radios Weather radio Radio websites Radio stubs Radio topics
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