Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.
| ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum |
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.
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Music
Radio :: Antiques
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Radio :: Recreation
Audio and Video :: Electronics
Digital :: Radios

Mobile Yes - A mobile site that will tell you what song is currently playing on almost any US radio station.
National Public Radio - The best radio station goes mobile.
NPR Thin - No frills, text only. The best radio station goes mobile.
The Stream - Here, you will find all your favorite US radio stations webcasting on RealOne Player, Windows Media Player, Streaming mp3 and Other formats listed by US state.
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