Deep Dive: T8A07
The correct answer is C: SSB signals have narrower bandwidth. A characteristic of single sideband (SSB) compared to FM is that SSB signals have narrower bandwidth. SSB uses about 3 kHz bandwidth, while FM uses about 15 kHz. This narrower bandwidth makes SSB more spectrum-efficient and better for weak-signal work, but it can make tuning more critical. For amateur radio operators, understanding bandwidth differences helps explain why SSB is used for weak-signal work and why FM provides better audio quality but uses more spectrum.
Why Other Answers Are Wrong
Option A: Incorrect. SSB signals are actually harder to tune correctly than FM because the tuning is more critical - being slightly off-frequency makes SSB unintelligible, while FM is more forgiving. Option B: Incorrect. SSB is actually more susceptible to interference in some ways because it doesn't have FM's capture effect. Strong signals can interfere with weak SSB signals more easily. Option D: Incorrect. Since A and B are wrong, 'all of the above' cannot be correct. Only the narrower bandwidth is a true advantage of SSB.
Exam Tip
SSB vs FM = SSB has narrower bandwidth. Think 'S'SB = 'S'maller bandwidth (~3 kHz vs ~15 kHz for FM). SSB is more spectrum-efficient. SSB is harder to tune and more susceptible to interference than FM.
Memory Aid
SSB vs FM = SSB has narrower bandwidth. Think 'S'SB = 'S'maller bandwidth (~3 kHz). More spectrum-efficient than FM (~15 kHz). Main advantage for weak-signal work.
Real-World Example
On a crowded band, SSB's 3 kHz bandwidth allows more stations to operate in the same frequency range compared to FM's 15 kHz. However, SSB requires more precise tuning - being 500 Hz off makes it unintelligible, while FM is more forgiving. The narrower bandwidth is SSB's main advantage for weak-signal and DX work.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T8A
Reference: 2022-2026 Question Pool · T8 - Signals and emissions
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T8A topic.