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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 ]
World :: Stations
Radio :: Regional and Ethnic
Internet :: Radio
Israel :: Middle East
Radio :: News and Media
Radio and Television :: Judaism
High tide was 5:03am beach front flooded Radio station still down, good thing we are on the second floor
fmintheam (FM in the AM) Thu, 12 Nov 2009 12:24:08 -0000
High tide was 5:03am beach front flooded Radio station still down, good thing we are on the second floor
just heard "Smooth" on the radio. 4got how good a song it is =). goin 2 get the rest of mishkas present laters
caitieh (caitlin heaney) Thu, 12 Nov 2009 12:24:03 -0000
just heard "Smooth" on the radio. 4got how good a song it is =). goin 2 get the rest of mishkas present laters
luistert naar Jackson Flavour van Paul Ritch. Is de favo track van @mkouwenhoven op XT3 techno radio
_b3rnd (Bernd - XT3 radio) Thu, 12 Nov 2009 12:24:00 -0000
luistert naar Jackson Flavour van Paul Ritch. Is de favo track van @mkouwenhoven op XT3 techno radio
JoCo NC Jobs | Online Editor-Raleigh at Radio One (NC) http://bit.ly/1sAUeE #job #ncjobs #joco
JoCoJobs (Johnston County Jobs) Thu, 12 Nov 2009 12:23:59 -0000
JoCo NC Jobs | Online Editor-Raleigh at Radio One (NC) http://bit.ly/1sAUeE #job #ncjobs #joco
@Herring1967 Just saw you are on Charlie Brooker's radio show. Do you know if the public can watch the recording? Thanks.
Jwalka1974 (Julie) Thu, 12 Nov 2009 12:23:58 -0000
@Herring1967 Just saw you are on Charlie Brooker's radio show. Do you know if the public can watch the recording? Thanks.
Now playing: Prophase by Transa. Klick to listen: http://www.radio.additan.com
AdditanRadio (Additan Radio) Thu, 12 Nov 2009 12:23:58 -0000
Now playing: Prophase by Transa. Klick to listen: http://www.radio.additan.com
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