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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 ]
I know this will make me sound much older than I am, but goddamn do I miss listening to the ball game on AM radio.
alexsperley (Alex Sperley) Thu, 29 Oct 2009 02:49:39 -0000
I know this will make me sound much older than I am, but goddamn do I miss listening to the ball game on AM radio.
get well soon, @NadiaFly! miss your spontaneous on the radio <3
AinMS (Ain Sabri) Thu, 29 Oct 2009 02:46:47 -0000
get well soon, @NadiaFly! miss your spontaneous on the radio <3
I still have left over smile from watching The Boat That Rocked last night. Made me miss the old radio days where everything's still organic
IrinaDewi (Irina Dewi) Thu, 29 Oct 2009 02:45:43 -0000
I still have left over smile from watching The Boat That Rocked last night. Made me miss the old radio days where everything's still organic
Well its on the radio, but you still won't miss anything!
TLAcheshill (TLA Chestnut Hill) Thu, 29 Oct 2009 02:40:31 -0000
Well its on the radio, but you still won't miss anything!
Recording Episode 92 of GamerHusbands Radio! Don't miss it, Fri
GHRSuperman (GHRSuperman) Thu, 29 Oct 2009 02:24:06 -0000
Recording Episode 92 of GamerHusbands Radio! Don't miss it, Fri
RT @atribecalledme I was just listening to Paper Trail and I kinda miss hearing T.I. on the radio...<<<
CoolnOff (Antonio Burden) Thu, 29 Oct 2009 02:21:54 -0000
RT @atribecalledme I was just listening to Paper Trail and I kinda miss hearing T.I. on the radio...<<<<eff the radio
TE Archive: Miss Radio - Concert review and photo.
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