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.
Other articles related to "radio, radios":
... contemporary O-Town Communications 91.1 FM KICW Classical music / Iowa Public Radio University of Northern Iowa ...
... 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 at a specific frequency in order to ...
... 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 ...
... XEMMM-AM, which began broadcasts in 1965, joined ESPN Radio in late 2002, replacing XETRA, which had changed from sports radio to adult standards some ... 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 ...
... is considered part of the Detroit television and radio market for purposes of territorial rights ... and its proximity to Toledo and Cleveland, radio and television broadcasters in Windsor are accorded a special status by the Canadian Radio-television and Telecommunications Commission, exempting them from ... 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 (prior to the ...
Famous quotes containing the word radio:
“from above, thin squeaks of radio static,
The captured fume of space foams in our ears”
—Hart Crane (18991932)
“A bibulation of sports writers, a yammer of radio announcers, a guilt of umpires, an indigence of writers.”
—Walter Wellesley (Red)
“Denouement to denouement, he took a personal pride in the
certain, certain way he lived his own, private life,
but nevertheless, they shut off his gas; nevertheless,
the bank foreclosed; nevertheless, the landlord called;
nevertheless, the radio broke,
And twelve oclock arrived just once too often,”
—Kenneth Fearing (19021961)