What control is typically adjusted for proper ALC setting on a single sideband transceiver?
The correct answer is B: Transmit audio or microphone gain. The control typically adjusted for proper ALC (Automatic Level Control) setting on a single sideband transceiver is transmit audio or microphone gain. ALC prevents overmodulation by controlling audio input level. Adjusting microphone gain controls how much audio drives the transmitter, which affects ALC. For amateur radio operators, proper ALC setting ensures good audio quality without distortion. Understanding this helps optimize SSB operation.
Exam Tip
ALC setting = adjust transmit audio or microphone gain. Think 'A'LC = 'A'udio 'L'evel 'C'ontrol. Microphone gain controls audio input, which affects ALC. Not RF clipping, antenna tuning, or receive attenuator - just microphone/audio gain.
Memory Aid
"ALC setting = adjust transmit audio or microphone gain. Think 'A'LC = 'A'udio 'L'evel 'C'ontrol. Microphone gain controls audio input, which affects ALC. Standard control for proper ALC setting."
Real-World Application
Your SSB transceiver shows ALC is too high (overmodulation). You reduce the microphone gain, which reduces the audio input level. This lowers the ALC reading, preventing overmodulation and distortion. Adjusting microphone gain is the standard way to set ALC properly.
Key Concepts
Why Other Options Are Wrong
Option A (RF clipping level): Incorrect. RF clipping isn't typically user-adjustable - it's an internal circuit function. ALC is controlled by audio input, not RF clipping.
Option C (Antenna inductance or capacitance): Incorrect. Antenna tuning doesn't affect ALC - ALC is about audio input level, not antenna matching.
Option D (Attenuator level): Incorrect. Attenuators are for receive, not transmit ALC. ALC is controlled by transmit audio/microphone gain.
题目解析
The correct answer is B: Transmit audio or microphone gain. The control typically adjusted for proper ALC (Automatic Level Control) setting on a single sideband transceiver is transmit audio or microphone gain. ALC prevents overmodulation by controlling audio input level. Adjusting microphone gain controls how much audio drives the transmitter, which affects ALC. For amateur radio operators, proper ALC setting ensures good audio quality without distortion. Understanding this helps optimize SSB operation.
考试技巧
ALC setting = adjust transmit audio or microphone gain. Think 'A'LC = 'A'udio 'L'evel 'C'ontrol. Microphone gain controls audio input, which affects ALC. Not RF clipping, antenna tuning, or receive attenuator - just microphone/audio gain.
记忆口诀
ALC setting = adjust transmit audio or microphone gain. Think 'A'LC = 'A'udio 'L'evel 'C'ontrol. Microphone gain controls audio input, which affects ALC. Standard control for proper ALC setting.
实际应用示例
Your SSB transceiver shows ALC is too high (overmodulation). You reduce the microphone gain, which reduces the audio input level. This lowers the ALC reading, preventing overmodulation and distortion. Adjusting microphone gain is the standard way to set ALC properly.
错误选项分析
Option A (RF clipping level): Incorrect. RF clipping isn't typically user-adjustable - it's an internal circuit function. ALC is controlled by audio input, not RF clipping. Option C (Antenna inductance or capacitance): Incorrect. Antenna tuning doesn't affect ALC - ALC is about audio input level, not antenna matching. Option D (Attenuator level): Incorrect. Attenuators are for receive, not transmit ALC. ALC is controlled by transmit audio/microphone gain.
知识点
ALC, Automatic Level Control, Microphone gain, Transmit audio
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.