Which of the following describes the function of an oscillator in a radio transmitter?

The function of an oscillator in a radio transmitter is to generate a specific frequency signal, which is essential for the operation of the transmitter. An oscillator converts energy into a repeating waveform, typically at a consistent frequency. This generated signal is the carrier wave that can then be modulated with audio or data signals for transmission.

In radio transmission, this carrier wave allows the information (such as voice or music) to be sent over long distances. The stability and precision of the frequency produced by the oscillator are critical to ensure that the transmitted signal can be accurately received on the corresponding receiving frequency, thus maintaining clarity and fidelity of the broadcast.

While amplifying audio signals, modulating the audio input, and filtering out unwanted frequencies are all important functions in a radio transmitter, they do not describe the primary role of the oscillator. Instead, those roles involve different components within the transmitter circuitry; amplifiers boost signal strength, modulation processes encode information onto the carrier, and filters remove extraneous frequencies. The oscillator's unique and essential function is focused on frequency generation.