What is vestigial sideband modulation?
The correct answer is A: Amplitude modulation in which one complete sideband and a portion of the other are transmitted. What vestigial sideband modulation is amplitude modulation in which one complete sideband and a portion of the other are transmitted. Vestigial sideband transmits one full sideband and part of the other. For amateur radio operators, this is important for fast-scan TV operation. Understanding this helps when operating fast-scan TV.
Exam Tip
Vestigial sideband modulation = AM in which one complete sideband and portion of other are transmitted. Think 'V'estigial 'S'ideband = 'V'ideo 'S'ideband (one full, one partial). Vestigial sideband transmits one full sideband and part of the other. Not inverted, not FM, not spread spectrum - just AM with partial sideband.
Memory Aid
"Vestigial sideband modulation = AM in which one complete sideband and portion of other are transmitted. Think 'V'estigial 'S'ideband = 'O'ne full, 'P'artial. Vestigial sideband transmits one full sideband and part of the other. Important for fast-scan TV operation."
Real-World Application
Vestigial sideband modulation: It's amplitude modulation in which one complete sideband and a portion of the other sideband are transmitted. For example, the upper sideband is transmitted completely, and a portion of the lower sideband (the vestige) is also transmitted. This is what vestigial sideband modulation is - AM with one full sideband and part of the other.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Modulation in which one sideband is inverted isn't vestigial sideband - vestigial sideband transmits one full sideband and part of the other, not inverted. Inverted sideband isn't vestigial.
Option C: Incorrect. Narrow-band FM with one sideband filtered isn't vestigial sideband - vestigial sideband is AM, not FM. FM isn't vestigial sideband.
Option D: Incorrect. Spread spectrum with FM following SSB AM isn't vestigial sideband - vestigial sideband is AM with partial sideband, not spread spectrum. Spread spectrum isn't vestigial sideband.
题目解析
The correct answer is A: Amplitude modulation in which one complete sideband and a portion of the other are transmitted. What vestigial sideband modulation is amplitude modulation in which one complete sideband and a portion of the other are transmitted. Vestigial sideband transmits one full sideband and part of the other. For amateur radio operators, this is important for fast-scan TV operation. Understanding this helps when operating fast-scan TV.
考试技巧
Vestigial sideband modulation = AM in which one complete sideband and portion of other are transmitted. Think 'V'estigial 'S'ideband = 'V'ideo 'S'ideband (one full, one partial). Vestigial sideband transmits one full sideband and part of the other. Not inverted, not FM, not spread spectrum - just AM with partial sideband.
记忆口诀
Vestigial sideband modulation = AM in which one complete sideband and portion of other are transmitted. Think 'V'estigial 'S'ideband = 'O'ne full, 'P'artial. Vestigial sideband transmits one full sideband and part of the other. Important for fast-scan TV operation.
实际应用示例
Vestigial sideband modulation: It's amplitude modulation in which one complete sideband and a portion of the other sideband are transmitted. For example, the upper sideband is transmitted completely, and a portion of the lower sideband (the vestige) is also transmitted. This is what vestigial sideband modulation is - AM with one full sideband and part of the other.
错误选项分析
Option B: Incorrect. Modulation in which one sideband is inverted isn't vestigial sideband - vestigial sideband transmits one full sideband and part of the other, not inverted. Inverted sideband isn't vestigial. Option C: Incorrect. Narrow-band FM with one sideband filtered isn't vestigial sideband - vestigial sideband is AM, not FM. FM isn't vestigial sideband. Option D: Incorrect. Spread spectrum with FM following SSB AM isn't vestigial sideband - vestigial sideband is AM with partial sideband, not spread spectrum. Spread spectrum isn't vestigial sideband.
知识点
Vestigial sideband modulation, Amplitude modulation, One complete sideband, Portion of other sideband
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.