Radio transmitter

A radio transmitter generates a radio-frequency signal, encodes information onto it through modulation, and sends it into space through an antenna.

Oscillator: An electronic circuit that generates a periodic signal, often at a controlled frequency. It supplies the carrier frequency that the transmitter will modulate.
Radio frequency: The range of electromagnetic frequencies commonly used for radio communication and related applications. A transmitter operates on a radio frequency selected for its service.
Broadcast transmitter: A radio transmitter designed to distribute audio or video programming to a broad audience. It uses transmitter principles to send scheduled programming over a coverage area.
Radio receiver: An electronic system that detects radio signals and extracts information from them. It performs the complementary task: recovering information rather than radiating it.
Modulation: The process of varying a signal's properties to encode information onto a carrier wave. It determines how the transmitter represents speech, data, or other information.
Carrier wave: A periodic waveform whose properties can be varied to carry information. It provides the signal that modulation changes to encode a message.
Mobile phone base station: Radio equipment that connects mobile devices to a cellular network in a defined area. Its radio unit transmits signals that coordinate cellular service with nearby devices.
Transceiver: A device that combines radio transmitting and receiving functions. It integrates both functions that a transmitter-only system keeps separate.
Power amplifier: An electronic circuit that increases a signal's power while preserving its useful form. It raises the modulated signal to a level suitable for transmission.
Baseband: A signal containing information before it is shifted onto a higher-frequency carrier. It is the information-bearing input that the transmitter prepares for radiation.

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