Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.
Information, such as sound, is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.
Read more about Radio: Etymology, Processes, Communication Systems, Uses of Radio
Other articles related to "radio, radios":
... In radio frequency telecommunications, field strength is the magnitude of the received electromagnetic field which will excite a receiving antenna and thereby induce a voltage ...
... which began broadcasts in 1965, joined ESPN Radio in late 2002, replacing XETRA, which had changed from sports radio to adult standards some months earlier ... In 2009, ESPN Radio moved to sister FM station XHMORE while XESPN joined ESPN Deportes Radio ... ESPN Deportes Radio is now available in the San Diego-Tijuana border region on XESS-AM 620 ...
... favorites Adult contemporary O-Town Communications 91.1 FM KICW Classical music / Iowa Public Radio University of Northern Iowa ...
... is considered part of the Detroit television and radio market for purposes of territorial rights ... this fact, and its proximity to Toledo and Cleveland, radio and television broadcasters in Windsor are accorded a special status by the Canadian Radio-televi ... The CanCon requirements are sometimes blamed in part for the decline in popularity of Windsor radio station CKLW, a 50,000 watt AM radio station that in the late 1960s (prio ...
... Broadcast stations AM 3, FM 9, shortwave 2 (1999) Radios 1.4 million (1997) In April, 2008, Nokia Siemens was appointed to replace parts of the existing radio network ...
Famous quotes containing the word radio:
“from above, thin squeaks of radio static,
The captured fume of space foams in our ears—”
—Hart Crane (1899–1932)
“The radio ... goes on early in the morning and is listened to at all hours of the day, until nine, ten and often eleven o’clock in the evening. This is certainly a sign that the grown-ups have infinite patience, but it also means that the power of absorption of their brains is pretty limited, with exceptions, of course—I don’t want to hurt anyone’s feelings. One or two news bulletins would be ample per day! But the old geese, well—I’ve said my piece!”
—Anne Frank (1929–1945)
“... the ... radio station played a Chopin polonaise. On all the following days news bulletins were prefaced by Chopin—preludes, etudes, waltzes, mazurkas. The war became for me a victory, known in advance, Chopin over Hitler.”
—Margaret Anderson (1886–1973)