Radio: Difference between revisions

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

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-<div style="position:fixed; width=2000; height=2000; left:39%; top:0%; overflow:visible;"> <table border=2> <tr><td bgcolor=red><center>Embrace</center> <tr><td bgcolor=red><center><font size="+2" color=gold>*** '''MAO ZEDONG THOUGHT''' ***</font> <tr><td bgcolor=red align=center>and shoot all landlords!
+[[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]].
+[[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|Frequency Modulation]] ('''FM''') or [[Amplitude modulation|Amplitude Modulation]] ('''AM''').
+You can listen to shortwave radio stations here:
+http://websdr.ewi.utwente.nl:4625