Transmitter

In electronics, a transmitter is a device which sends signals using radio waves.

The transmitter converts direct current (DC) into alternating current (AC) at the desired frequency. Most transmitters use a quartz crystal to set the frequency of the resulting carrier wave. A modulator modifies the carrier wave, by frequency modulation or amplitude modulation or some other kind, to include the information needed, such as an audio or video signal. The modified waves are sent by an antenna to another antenna at the receiver which extracts the information from the waves.

 Other websites 
 International Telecommunication Union
 Jim Hawkins' Radio and Broadcast Technology Page 
 WCOV-TV's Transmitter Technical Website 
 Major UK television transmitters including change of group information, see Transmitter Planning section.
 Richard Moore's Anorak Zone Photo Gallery of UK TV and Radio transmission sites 

Category:Machines
Category:Radio