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

Question: 1 / 400

What does the term “QRM” refer to in ham radio?

Intentional interference

Unintentional man-made interference

The term "QRM" in ham radio specifically refers to unintentional man-made interference that disrupts communications. It is a standardized abbreviation derived from the Q-code used in amateur radio and other types of radio communication. This term applies to noise or signals originating from electrical devices, power lines, or other sources that adversely affect the clarity of radio signals, making it difficult for operators to hear or communicate effectively.

Understanding the meaning of QRM is important for ham radio operators, as it allows them to identify and troubleshoot unwanted noise in their operating environment. Unlike intentional interference, which may be created by other operators deliberately trying to disrupt communications, QRM indicates a level of interference that is usually incidental and can affect various frequency ranges and modes.

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Weather-related interference

Signal distortion

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