Question T2B10
From subelement T2 - T2B
Which Q signal indicates that you are receiving interference from other stations?
Why is this correct?
QRM indicates interference from other stations. The retrieved context specifically states that amateurs use Q-signals as three-letter combinations for commonly-used phrases, and you need to know QRM means interference from other stations. QRN refers to natural noise (static), QTH means location, and QSB indicates signal fading. Only QRM specifically identifies man-made interference from other amateur stations.
Memory tip
Remember the pattern: Q-signals starting with QR typically relate to signal conditions. The 'M' in QRM can help you remember 'Man-made' interference, distinguishing it from natural noise sources. This pattern recognition helps across multiple Q-signal questions on the exam.
Learn more
In practical amateur radio operation, distinguishing QRM from QRN is crucial for troubleshooting communication problems. QRM (man-made interference) might require frequency changes or directional antennas, while QRN (natural static) often improves with better receiver filtering or waiting for atmospheric conditions to change. Understanding this difference helps operators make informed decisions about whether to change frequency, adjust equipment, or simply wait for conditions to improve during actual on-air communications.
Think about it
Why do you think amateur radio operators need different Q-signals to distinguish between man-made interference and natural noise when both can disrupt communications?