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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.
Radio waves
Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.
| ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum |
Electromagnetic spectrum and diagram of radio transmission of an audio signal.
Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.
More on [ Radio ]
21:00 BBC Radio 1's Stories: Who decides which songs end up on TV and film soundtracks? Scene Stealers tries to find the short cut to ge ...
onradio1now (On BBC Radio 1 Now) Mon, 05 Oct 2009 19:45:58 -0000
21:00 BBC Radio 1's Stories: Who decides which songs end up on TV and film soundtracks? Scene Stealers tries to find the short cut to ge ...
Chinese Radio Sept 27: http://www.publicbroadcasting.net/krcl/news.newsmain/article/4807/0/1559523/Chinese.Radio/Chinese.Radio.September.27
KRCLchinese (KRCL Chinese Radio) Mon, 05 Oct 2009 19:45:57 -0000
Chinese Radio Sept 27: http://www.publicbroadcasting.net/krcl/news.newsmain/article/4807/0/1559523/Chinese.Radio/Chinese.Radio.September.27
Zuletzt im Radio: Biest mit Metall. Klick to listen: http://www.ostwelle.de
radioostwelle (Ostwelle Radio) Mon, 05 Oct 2009 19:45:56 -0000
Zuletzt im Radio: Biest mit Metall. Klick to listen: http://www.ostwelle.de
@radio o panico na TV conseguiu 89 pontos de ibope no domingo desbancando o fantasticooo
jackcaversan (Joao pedro caversan) Mon, 05 Oct 2009 19:45:55 -0000
@radio o panico na TV conseguiu 89 pontos de ibope no domingo desbancando o fantasticooo
@Jamericanese 1st and last. Parents should turn off the tv and radio once in a while.
casacorbin (Casa) Mon, 05 Oct 2009 19:45:53 -0000
@Jamericanese 1st and last. Parents should turn off the tv and radio once in a while.
@AntiMileyHaters the first time Miley heard herself on the radio she was in her kitchen
AshleighJonas (Ashleigh Jonas ) Mon, 05 Oct 2009 19:45:51 -0000
@AntiMileyHaters the first time Miley heard herself on the radio she was in her kitchen
Earwaves Network - Online site for Earwaves and Radio 3000 radio shows (Santa Cruz, CA), and the Earwaves experimental music reviews.
Where's the Beat? - A radio show on CKUT 90.3 FM in Montreal, dedicated to contemporary classical and electroacoustic music. With playlist, schedule, and links.
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