What can you do if you are told your FM handheld or mobile transceiver is over-deviating?
The correct answer is D: Talk farther away from the microphone. If your FM handheld or mobile transceiver is over-deviating (exceeding the maximum allowed frequency deviation), you should talk farther away from the microphone. Over-deviation occurs when the audio input is too strong, causing the FM signal to deviate beyond legal limits (typically ±5 kHz for narrowband FM). Moving away from the microphone reduces the audio level, which reduces the deviation. For amateur radio operators, understanding deviation control is important for legal operation and clear communications. Over-deviation can cause interference to adjacent channels and violate FCC regulations. Proper microphone technique helps maintain proper deviation levels.
Exam Tip
Over-deviation = too much audio = talk farther from mic. Think 'O'ver-deviation = 'O'ver audio level = move 'O'ff (away from) microphone. Reducing audio input reduces deviation.
Memory Aid
"Over-deviation = talk farther from mic. Think 'O'ver-deviation = 'O'ver audio = move 'O'ut (away). Distance reduces audio, which reduces deviation."
Real-World Application
If someone reports your signal is over-deviating on the repeater, you're speaking too close to the microphone, causing excessive audio levels. By moving the microphone 6-12 inches away from your mouth, you reduce the audio input, which reduces the frequency deviation back to legal limits. This improves signal quality and ensures compliance with regulations.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Talking louder increases audio level, which increases deviation, making over-deviation worse, not better.
Option B: Incorrect. Cooling off doesn't affect deviation. Deviation is controlled by audio input level, not temperature.
Option C: Incorrect. Higher power level doesn't reduce deviation - it increases transmit power but doesn't affect the frequency deviation caused by audio.
题目解析
The correct answer is D: Talk farther away from the microphone. If your FM handheld or mobile transceiver is over-deviating (exceeding the maximum allowed frequency deviation), you should talk farther away from the microphone. Over-deviation occurs when the audio input is too strong, causing the FM signal to deviate beyond legal limits (typically ±5 kHz for narrowband FM). Moving away from the microphone reduces the audio level, which reduces the deviation. For amateur radio operators, understanding deviation control is important for legal operation and clear communications. Over-deviation can cause interference to adjacent channels and violate FCC regulations. Proper microphone technique helps maintain proper deviation levels.
考试技巧
Over-deviation = too much audio = talk farther from mic. Think 'O'ver-deviation = 'O'ver audio level = move 'O'ff (away from) microphone. Reducing audio input reduces deviation.
记忆口诀
Over-deviation = talk farther from mic. Think 'O'ver-deviation = 'O'ver audio = move 'O'ut (away). Distance reduces audio, which reduces deviation.
实际应用示例
If someone reports your signal is over-deviating on the repeater, you're speaking too close to the microphone, causing excessive audio levels. By moving the microphone 6-12 inches away from your mouth, you reduce the audio input, which reduces the frequency deviation back to legal limits. This improves signal quality and ensures compliance with regulations.
错误选项分析
Option A: Incorrect. Talking louder increases audio level, which increases deviation, making over-deviation worse, not better. Option B: Incorrect. Cooling off doesn't affect deviation. Deviation is controlled by audio input level, not temperature. Option C: Incorrect. Higher power level doesn't reduce deviation - it increases transmit power but doesn't affect the frequency deviation caused by audio.
知识点
FM deviation, Over-deviation, Microphone technique, FM operation
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.