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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.

Radio waves

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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

Other types of electromagnetic radiation, with frequencies above the RF range, are infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
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.

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aldolucio (Aldo Lúcio Fonseca) Fri, 01 Jan 2010 21:06:02 -0000
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studio80radio (Studio 80 Radio) Fri, 01 Jan 2010 21:06:02 -0000
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Acik Radyo 94.9 Istanbul - Acik Radyo (Open Radio) is a private and independent radio station, broadcasting in Istanbul. Owned by 90 professionals from various fields, it has a main goal - to be a medium that is open to all the sounds, colors and vibrations of the universe.

BBC World Service - Radio Schedules for Turkey - Online listening plus day-by-day broadcast programme schedules with radio stations and frequencies by city and language.
Meta Description: [ International news, analysis and information from the BBC World Service. In-depth news and sport with audio, video and forums. BBC World Service reports in English and 32 other languages. ]

Live Turkish Radios - Directory of stations broadcasting on Internet, Turkish daily newspapers, magazines, and television stations.
Meta Description: [ List of Turkish Radios broadcasting on internet,and turkish daily newspapers, magazines, television stations, turkish music, last minute news and more ... ]