Search results
Results from the WOW.Com Content Network
An antenna farm hosting various radio antennas on Sandia Peak near Albuquerque, New Mexico, United States. Radio is the technology of communicating using radio waves. [1] [2] [3] Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz).
Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. In an 1864 presentation, published in 1865, James Clerk Maxwell proposed theories of electromagnetism and mathematical proofs demonstrating that light, radio and x-rays were all types of electromagnetic waves propagating through free space.
Radio broadcasting has been used in the United States since the early 1920s to distribute news and entertainment to a national audience. In 1923, 1 percent of U.S. households owned at least one radio receiver, while a majority did by 1931 and 75 percent did by 1937.
Radio stations in United States have evolved since their early twentieth-century origins. In 1920 8MK started operations in Detroit; after it, thousands of private and public radio have operated in the United States.
Main page; Contents; Current events; Random article; About Wikipedia; Contact us
Using various patents, the "Marconi Company" was established and began communication between coast radio stations and ships at sea. This company, along with its subsidiary Marconi Wireless Telegraph Company of America, had a stranglehold on ship to shore communication.
The RCA model R7 Superette superheterodyne table radio. This is a list of notable radios, which encompasses specific models and brands of radio transmitters, receivers and transceivers, both actively manufactured and defunct, including receivers, two-way radios, citizens band radios, shortwave radios, ham radios, scanners, weather radios and airband and marine VHF radios.
RTÉ Radio 1 (current affairs and speech based broadcasting); RTÉ 2fm (rock and pop music); RTÉ lyric fm (classical music plus jazz, world music and arts); RTÉ Raidió na Gaeltachta (the Irish language station targeted at the Gaeltacht, and the Irish language-speaking community of Ireland)