Ham Radio Extra Class Practice Test 2025 - Free Extra Class License Exam Questions and Study Guide

Question: 1 / 400

What modulation mode uses amplitude variations to convey information?

Frequency Modulation (FM)

Phase Modulation (PM)

Amplitude Modulation (AM)

Amplitude Modulation (AM) utilizes variations in the amplitude of a carrier wave to transmit information, such as audio or data signals. In AM, the strength of the carrier signal changes in accordance with the information being sent, while the frequency remains constant. This allows the receiver to demodulate the signal and recover the original audio or data.

In contrast, Frequency Modulation (FM) changes the frequency of the carrier wave instead of its amplitude, and Phase Modulation (PM) shifts the phase of the carrier wave to convey information. Single Sideband (SSB) is a refined version of AM where only one sideband is transmitted, conserving bandwidth and power, but still fundamentally relies on the principles of amplitude modulation for information transfer.

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Single Sideband (SSB)

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