Which Q signal indicates that you are receiving interference from other stations?
The correct answer is A: QRM. QRM is the Q signal that indicates you are receiving interference from other stations. Q signals are three-letter codes used in amateur radio to convey common information quickly and efficiently.
QRM specifically refers to interference from other radio stations (man-made interference). It's different from QRN (natural interference like atmospheric noise) and other Q signals. Q signals can be used in both voice and CW communications, though they originated in Morse code. When you say 'QRM' or send it in CW, you're indicating that interference from other stations is affecting your reception.
Exam Tip
Interference from stations = QRM. Remember: QRM means interference from other radio stations. Think 'QRM = Radio Man-made interference'.
Memory Aid
"**Q**RM = **Q**uiet **R**adio **M**issing (think 'QRM = Quiet Radio Missing' due to interference)"
Real-World Application
You're trying to copy a weak signal on 20 meters, but another station is transmitting nearby and causing interference. You tell the other operator 'QRM here' or send 'QRM' in CW, indicating that interference from other stations is making it difficult to copy their signal.
FCC Part 97.119Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. QRN indicates natural interference (atmospheric noise, static), not interference from other stations.
Option C: Incorrect. QTH means 'location' or 'my location is...' It's not related to interference.
Option D: Incorrect. QSB means 'fading' or 'signal strength varies.' It's about signal strength variation, not interference.
题目解析
The correct answer is A: QRM. QRM is the Q signal that indicates you are receiving interference from other stations. Q signals are three-letter codes used in amateur radio to convey common information quickly and efficiently. QRM specifically refers to interference from other radio stations (man-made interference). It's different from QRN (natural interference like atmospheric noise) and other Q signals. Q signals can be used in both voice and CW communications, though they originated in Morse code. When you say 'QRM' or send it in CW, you're indicating that interference from other stations is affecting your reception.
考试技巧
Interference from stations = QRM. Remember: QRM means interference from other radio stations. Think 'QRM = Radio Man-made interference'.
记忆口诀
**Q**RM = **Q**uiet **R**adio **M**issing (think 'QRM = Quiet Radio Missing' due to interference)
实际应用示例
You're trying to copy a weak signal on 20 meters, but another station is transmitting nearby and causing interference. You tell the other operator 'QRM here' or send 'QRM' in CW, indicating that interference from other stations is making it difficult to copy their signal.
错误选项分析
Option B: Incorrect. QRN indicates natural interference (atmospheric noise, static), not interference from other stations. Option C: Incorrect. QTH means 'location' or 'my location is...' It's not related to interference. Option D: Incorrect. QSB means 'fading' or 'signal strength varies.' It's about signal strength variation, not interference.
知识点
Q signals, QRM, Interference, Amateur radio procedures
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.