Radio: Difference between revisions
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[[File:Tyholt taarnet.jpg|thumb|250px|A radio tower.]] | [[File:Tyholt taarnet.jpg|thumb|250px|A radio tower.]] | ||
'''Radio''' is a way to send [[Signal (electrical engineering)|electromagnetic signal]]s over a long distance, to deliver [[information]] from one place to another. A machine that sends radio signals is called a '''transmitter''', while a machine that "picks up" the signals is called a '''receiver'''. A machine that does both jobs is a "transceiver". When [[radio signal]]s are sent out to many receivers at the same time, it is called a [[broadcast]]. | '''Radio''' is a way to send [[Signal (electrical engineering)|electromagnetic signal]]s over a long distance, to deliver [[information]] from one place to another. A machine that sends radio signals is called a '''transmitter''', while a machine that "picks up" the signals is called a '''receiver'''. A machine that does both jobs is a "transceiver". When [[radio signal]]s are sent out to many receivers at the same time, it is called a [[broadcast]]. | ||
Latest revision as of 13:48, 2 December 2020
Radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. A machine that sends radio signals is called a transmitter, while a machine that "picks up" the signals is called a receiver. A machine that does both jobs is a "transceiver". When radio signals are sent out to many receivers at the same time, it is called a broadcast.
Television also uses radio signals to send pictures and sound. Radio signals can start engines moving so that gates open on their own from a distance. (See: Radio control.). Radio signals can be used to lock and unlock the doors in a car from a distance.
Sound can be sent by radio, sometimes through Frequency Modulation (FM) or Amplitude Modulation (AM).
You can listen to shortwave radio stations here:
http://websdr.ewi.utwente.nl:4625