Transmitter

A transmitter (sometimes abbreviated XMTR) is an electronic device which with the aid of an antenna propagates an electromagnetic signal such as radio, television, or other telecommunications.

Related Topics:
Electronic - Device - Antenna - Electromagnetic - Signal - Radio - Television - Telecommunications

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A transmitter usually has a power supply, an oscillator, a modulator, and amplifiers for audio (AF), intermediate frequency (IF) and radio frequency (RF). 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 frequency, which is then broadcast.

Related Topics:
Power supply - Oscillator - Modulator - Amplifier - Audio - Intermediate frequency - Radio frequency - Cell phone - Radio receiver - Transceiver - Carrier

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More generally and in communications and information processing, a "transmitter" is any object (source) which sends information to an observer (receiver).

Related Topics:
Communications - Information processing - Object - Source - Information - Observer - Receiver

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For example, in industrial process control a "transmitter" is any device which converts measurements from a sensor into a signal to be received, usually sent via wires, by some display or control device located a distance away. Some "transmitters" use 4-20 mA current loop or digital methods for transmission of measurements. Some such transmitters even send process signals as 3-15 psi varying pneumatic pressure. When used in this more general sense, vocal cords may also be considered an example of a "transmitter".

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