What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter?
The correct answer is C: Distorted speech. The sound heard from an audio device experiencing RF interference from a single sideband phone transmitter is distorted speech. SSB signals are demodulated by the audio device's non-linear circuits, producing distorted audio. For amateur radio operators, this is a common RFI symptom. Understanding this helps identify SSB interference.
Exam Tip
SSB interference sound = distorted speech. Think 'S'SB 'I'nterference = 'S'peech 'I's distorted. SSB signals are demodulated by audio device's non-linear circuits, producing distorted audio. Not hum, not clicking, not clear speech - just distorted speech.
Memory Aid
"SSB interference sound = distorted speech. Think 'S'SB 'I'nterference = 'S'peech 'I's distorted. SSB signals are demodulated by audio device's non-linear circuits, producing distorted audio. Characteristic SSB interference symptom."
Real-World Application
Your neighbor's SSB transmitter is interfering with your audio system. You hear distorted speech coming from your speakers - the SSB signal is being demodulated by the audio device's non-linear circuits, producing garbled, distorted audio. This is the characteristic sound of SSB interference.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. SSB interference doesn't produce a steady hum - that's more typical of carrier interference. SSB produces distorted speech, not hum.
Option B: Incorrect. SSB interference doesn't produce on-and-off humming or clicking - that's more typical of CW interference. SSB produces continuous distorted speech.
Option D: Incorrect. SSB interference doesn't produce clearly audible speech - the speech is distorted, not clear. Clear speech would indicate proper reception, not interference.
题目解析
The correct answer is C: Distorted speech. The sound heard from an audio device experiencing RF interference from a single sideband phone transmitter is distorted speech. SSB signals are demodulated by the audio device's non-linear circuits, producing distorted audio. For amateur radio operators, this is a common RFI symptom. Understanding this helps identify SSB interference.
考试技巧
SSB interference sound = distorted speech. Think 'S'SB 'I'nterference = 'S'peech 'I's distorted. SSB signals are demodulated by audio device's non-linear circuits, producing distorted audio. Not hum, not clicking, not clear speech - just distorted speech.
记忆口诀
SSB interference sound = distorted speech. Think 'S'SB 'I'nterference = 'S'peech 'I's distorted. SSB signals are demodulated by audio device's non-linear circuits, producing distorted audio. Characteristic SSB interference symptom.
实际应用示例
Your neighbor's SSB transmitter is interfering with your audio system. You hear distorted speech coming from your speakers - the SSB signal is being demodulated by the audio device's non-linear circuits, producing garbled, distorted audio. This is the characteristic sound of SSB interference.
错误选项分析
Option A: Incorrect. SSB interference doesn't produce a steady hum - that's more typical of carrier interference. SSB produces distorted speech, not hum. Option B: Incorrect. SSB interference doesn't produce on-and-off humming or clicking - that's more typical of CW interference. SSB produces continuous distorted speech. Option D: Incorrect. SSB interference doesn't produce clearly audible speech - the speech is distorted, not clear. Clear speech would indicate proper reception, not interference.
知识点
SSB interference, Distorted speech, Audio device, RFI symptoms
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.