Radio Communication

[jenn]

How does a radio work?

[lambsbell]

plug it into the mains and turn the power on

[thecooler]

Am radio transmitters use an occillator to generate a high frequency tone - this is the broadcast frequency - which varies in amplitude according to the sounds fed into it. The receiver uses a simple circuit to extract the audio information. FM is a bit more complex, based on varying the frequency. These pages give a simple guide: http://entertainment.howstuffworks.com/radio.htm

[chrislangham]

And in addition. The modern modulation methods use a system called "opti mod" that adjusts the transmitter modulation power as the sound level in the broadcast studio varies. thus obtaining a relatively stable volume level on your radio receiver.