G8A02: Phase modulation: Name of the process that changes the

Q: What is the name of the process that changes the phase angle of an RF signal to convey information?

The correct answer is B: Phase modulation. The correct answer is B: Phase modulation. The name of the process that changes the phase angle of an RF signal to convey information is phase modulation. Phase modulation varies the phase of the carrier based on the modulating signal. For amateur radio operators, this is a fundamental modulation type. Understanding this helps when operating different modes.

Updated: Dec 9, 2025 | Source: 2023-2027 Question Pool | Topic: G8A

G8A02G8A

What is the name of the process that changes the phase angle of an RF signal to convey information?

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Deep Dive: G8A02

The correct answer is B: Phase modulation. The name of the process that changes the phase angle of an RF signal to convey information is phase modulation. Phase modulation varies the phase of the carrier based on the modulating signal. For amateur radio operators, this is a fundamental modulation type. Understanding this helps when operating different modes.

Why Other Answers Are Wrong

Option A (Phase convolution): Incorrect. Phase convolution isn't a standard modulation term - phase modulation is the correct term. Convolution is a mathematical operation, not modulation. Option C (Phase transformation): Incorrect. Phase transformation isn't a standard modulation term - phase modulation is the correct term. Transformation is too general. Option D (Phase inversion): Incorrect. Phase inversion is flipping phase 180°, not modulation - phase modulation varies phase continuously. Inversion is different.

Exam Tip

Change phase angle to convey information = phase modulation. Think 'P'hase 'M'odulation = 'P'hase 'M'odified to convey information. Phase modulation varies the phase of carrier based on modulating signal. Not convolution, not transformation, not inversion - just phase modulation.

Memory Aid

Change phase angle to convey information = phase modulation. Think 'P'hase 'M'odulation = 'P'hase 'M'odified. Phase modulation varies the phase of carrier based on modulating signal. Standard modulation type.

Real-World Example

Phase modulation: The phase angle of the RF carrier is varied based on the audio signal. As the audio changes, the carrier phase shifts. This is phase modulation - the phase angle is changed to convey information. Phase modulation is used in some digital modes and is related to frequency modulation.

Source & Coverage

Question Pool: 2023-2027 Question Pool

Subelement: G8A

Reference: 2023-2027 Question Pool · G8 - Signals and Emissions

Key Concepts

Phase modulation Phase angle RF signal Modulation types

Verified Content

Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G8A topic.