Question
What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?
Answer Options
- A) Frequency convolution
- B) Frequency transformation
- C) Frequency conversion
- D) Frequency modulation
Correct Answer: D
Explanation
The process of conveying information over a carrier wave by altering its characteristics is modulation. When the information (voice, audio tones, or digital data) is used to change the carrier’s instantaneous frequency, it is called frequency modulation.
In frequency modulation (FM), the carrier’s amplitude remains constant, but its frequency is varied in direct proportion to the amplitude of the modulating signal. This method is highly resistant to noise and static and is the standard for high-quality voice communications on VHF and UHF amateur bands.
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