Ham Radio General Class Practice Test

What is the name of the process which changes the frequency of an RF wave to convey information?

1. Frequency convolution

2. Frequency transformation

3. Frequency conversion

4. Frequency modulation

The correct answer is: Frequency modulation

The process that changes the frequency of an RF wave to convey information is known as frequency modulation. In this method, the frequency of the carrier wave is varied in accordance with the amplitude of the input signal, which contains the information to be transmitted. This allows for the communication of diverse audio, video, and data signals over radio waves. Frequency modulation is a key technique used in various forms of wireless communication, including FM radio broadcasting, where it provides improved sound quality and greater immunity to interference compared to other modulation methods. The distinctive way frequency modulation works—by varying the frequency rather than the amplitude—allows for a more efficient and clearer transmission of complex information. The other terms mentioned refer to different processes that do not specifically address the method of changing frequency to convey information in the same context as frequency modulation does. For example, frequency conversion might imply a broader range of changes to the signal that do not necessarily involve information encoding.