The Transmitter reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Transmitter

A transmitter is an electronic device which with the aid of an antenna propagates an electromagnetic signal such as radio, television, telecommunications, etc.

A transmitter usually has a power supply, an oscillator, a modulator and audio, IF (intermediate frequency) and RF (radio frequency) amplifiers. Sometimes a device, for example, a cell phone contains both a transmitter and a radio receiver or transceiver. The modulator is the device which piggybacks (or modulates) the signal information onto the carrier radio frequency which is broadcast.

In communications and information processing, a transmitter is an object (source) which sends information to an observer (receiver).

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