What might be a problem if you receive a report that your audio signal through an FM repeater is distorted or unintelligible?
The correct answer is D: All these choices are correct. If you receive a report that your audio signal through an FM repeater is distorted or unintelligible, the problem could be: your transmitter is slightly off frequency, your batteries are running low, or you are in a bad location. All three can cause poor audio quality. Being off-frequency causes distortion as the repeater's receiver can't properly demodulate your signal. Low batteries reduce transmitter power and can cause frequency drift. A bad location (poor signal path, multipath, or weak signal) can result in a weak signal that the repeater can't properly receive. For amateur radio operators, checking all three helps diagnose and fix audio quality problems.
Exam Tip
All three can cause distorted audio: off-frequency, low batteries, bad location. When all options are valid causes, 'all of the above' is usually the answer. Check frequency, power, and location.
Memory Aid
"All three cause distorted audio: Off-frequency, Low batteries, Bad location. Think 'A'll 'O'ptions 'L'ead to 'B'ad audio. Check frequency, power, and location."
Real-World Application
Someone reports your audio on the repeater is distorted. You check: (1) Your frequency - you're 500 Hz off, causing distortion. (2) Your batteries - they're at 10.5V instead of 13.8V, reducing power. (3) Your location - you're in a valley with poor signal path to the repeater. Any of these could cause the problem, so you fix all three: retune frequency, charge batteries, move to a better location.
Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Low batteries and bad location can also cause the problem.
Option B: While correct, this is incomplete. Off-frequency and bad location can also cause the problem.
Option C: While correct, this is incomplete. Off-frequency and low batteries can also cause the problem.
题目解析
The correct answer is D: All these choices are correct. If you receive a report that your audio signal through an FM repeater is distorted or unintelligible, the problem could be: your transmitter is slightly off frequency, your batteries are running low, or you are in a bad location. All three can cause poor audio quality. Being off-frequency causes distortion as the repeater's receiver can't properly demodulate your signal. Low batteries reduce transmitter power and can cause frequency drift. A bad location (poor signal path, multipath, or weak signal) can result in a weak signal that the repeater can't properly receive. For amateur radio operators, checking all three helps diagnose and fix audio quality problems.
考试技巧
All three can cause distorted audio: off-frequency, low batteries, bad location. When all options are valid causes, 'all of the above' is usually the answer. Check frequency, power, and location.
记忆口诀
All three cause distorted audio: Off-frequency, Low batteries, Bad location. Think 'A'll 'O'ptions 'L'ead to 'B'ad audio. Check frequency, power, and location.
实际应用示例
Someone reports your audio on the repeater is distorted. You check: (1) Your frequency - you're 500 Hz off, causing distortion. (2) Your batteries - they're at 10.5V instead of 13.8V, reducing power. (3) Your location - you're in a valley with poor signal path to the repeater. Any of these could cause the problem, so you fix all three: retune frequency, charge batteries, move to a better location.
错误选项分析
Option A: While correct, this is incomplete. Low batteries and bad location can also cause the problem. Option B: While correct, this is incomplete. Off-frequency and bad location can also cause the problem. Option C: While correct, this is incomplete. Off-frequency and low batteries can also cause the problem.
知识点
FM repeater audio quality, Frequency accuracy, Battery power, Signal path
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.