Deep Dive: E2B06
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E2B
Reference: 2024-2028 Question Pool · E2 - Operating Procedures
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E2B topic.