Deep Dive: T2B05
The correct answer is C: You are talking too loudly. FM transmission audio distortion on voice peaks is typically caused by overmodulation - when you speak too loudly into the microphone, your voice signal exceeds the maximum modulation level the transmitter can handle. FM transmitters have a maximum deviation limit (typically ±5 kHz for amateur radio). When you speak too loudly, the audio signal tries to exceed this limit, causing the transmitter to clip the signal, which results in distortion. The solution is to speak at a normal volume or reduce the microphone gain. Talking louder doesn't help - it makes the problem worse.
Why Other Answers Are Wrong
Option A: Incorrect. Inverted repeater offset (transmitting on output, receiving on input) would prevent repeater access but wouldn't cause audio distortion on voice peaks. Option B: Incorrect. Talking louder makes the distortion worse, not better. The problem is already too much audio level. Option D: Incorrect. High transmit power doesn't cause audio distortion. The issue is audio level, not RF power.
Exam Tip
FM distortion on peaks = Talking too loud. Remember: If your FM audio distorts on voice peaks, you're overmodulating - speak at a normal volume or reduce microphone gain.
Memory Aid
**F**M **D**istortion = **F**orced **M**odulation (think 'FD = FM' = Forced Modulation, too loud)
Real-World Example
You're transmitting on a 2-meter FM repeater, and other operators tell you your audio is distorted, especially when you get excited and speak louder. The problem is overmodulation - your voice is too loud for the transmitter. You reduce your microphone gain or speak at a more moderate volume, and the distortion disappears.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T2B
Reference: FCC Part 97.307
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T2B topic.