Deep Dive: G2A06
The correct answer is D: Less bandwidth used and greater power efficiency. An advantage of using single sideband (SSB) compared to other analog voice modes on the HF amateur bands is that it uses less bandwidth and has greater power efficiency. SSB uses about 3 kHz bandwidth (vs 6 kHz for AM) and puts all power into the sideband (no carrier power wasted). For amateur radio operators, this makes SSB more spectrum-efficient and allows more contacts with the same power. Understanding this helps explain why SSB is preferred on HF.
Why Other Answers Are Wrong
Option A: Incorrect. SSB doesn't provide very high-fidelity voice - AM actually has better fidelity. SSB's advantage is efficiency, not fidelity. Option B: Incorrect. SSB isn't less subject to atmospheric static - all modes are affected similarly by static. This isn't an SSB advantage. Option C: Incorrect. SSB isn't easier to tune or more immune to impulse noise - FM is actually easier to tune and more immune to noise. This isn't an SSB advantage.
Exam Tip
SSB advantage = less bandwidth and greater power efficiency. Think 'S'SB = 'S'pectrum and 'S'ignal efficient. Uses 3 kHz (vs 6 kHz for AM) and all power in sideband (no carrier wasted). Not about fidelity, static, or ease of tuning.
Memory Aid
SSB advantage = less bandwidth and greater power efficiency. Think 'S'SB = 'S'pectrum and 'S'ignal efficient. Uses less bandwidth (3 kHz vs 6 kHz) and all power in sideband. Main advantages for HF operation.
Real-World Example
You compare SSB to AM on 20 meters. SSB uses 3 kHz bandwidth while AM uses 6 kHz - you can fit twice as many SSB signals in the same frequency range. Also, SSB puts all 100 watts into the sideband, while AM wastes power on the carrier. This makes SSB more efficient for HF operation.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G2A
Reference: 2023-2027 Question Pool · G2 - Operating Procedures
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G2A topic.