Q.The RF channel in a radio transmitter produces :
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Start your 14-day free trial to unlock the full solution →The RF section of a radio transmitter is specifically the stage that generates the high-frequency carrier wave, distinct from the audio-frequency stage that handles the message signal.
A radio transmitter is built around two functionally distinct signal paths that are ultimately combined by a modulator: an audio-frequency (AF) channel, which picks up, amplifies, and processes the low-frequency message/sound signal (typically in the range of a few Hz up to about 20 kHz for audio); and a radio-frequency (RF) channel, built around an RF oscillator (and its associated amplifier stages), which generates a stable, high-frequency sinusoidal carrier wave — typically in the hundreds of kHz to hundreds of MHz range, well above audible frequencies — suitable for efficient radiation from an antenna and for allocation to a specific broadcast channel.
It is this carrier wave, produced by the RF channel, that is then modulated (its amplitude, in AM, or its frequency, in FM) by the audio signal coming from the AF channel, in the modulator stage, to produce the final transmitted signal. The RF channel's job is purely to supply this stable high-frequency carrier — it does not itself carry or process the audio information.
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