Deep Dive: T8A08
The correct answer is B: 3 kHz. The approximate bandwidth of a typical single sideband (SSB) voice signal is 3 kHz. This bandwidth accommodates the audio frequencies needed for intelligible voice (typically 300-3000 Hz), plus some guard bands. SSB's narrow bandwidth is one of its main advantages, making it spectrum-efficient and good for weak-signal work. For amateur radio operators, understanding SSB bandwidth helps explain why multiple SSB signals can operate in a small frequency range and why SSB is preferred for weak-signal and DX work where spectrum efficiency matters.
Why Other Answers Are Wrong
Option A (1 kHz): Incorrect. 1 kHz is too narrow for voice - it would cut off important audio frequencies, making speech unintelligible. SSB needs about 3 kHz for good voice quality. Option C (6 kHz): Incorrect. 6 kHz is wider than typical SSB - that's more like AM bandwidth. SSB uses about 3 kHz because it only transmits one sideband. Option D (15 kHz): Incorrect. 15 kHz is FM bandwidth, not SSB. SSB is much narrower at about 3 kHz.
Exam Tip
SSB bandwidth = 3 kHz. Think 'S'SB = 'S'ingle sideband = 'S'mall bandwidth (~3 kHz). Narrow enough for efficiency, wide enough for voice. 1 kHz is too narrow, 6-15 kHz is too wide.
Memory Aid
SSB bandwidth = 3 kHz. Think 'S'SB = 'S'ingle sideband = 'S'mall bandwidth (~3 kHz). Narrow and efficient for voice communications. Standard for HF SSB operation.
Real-World Example
Your SSB signal on 20 meters uses about 3 kHz of bandwidth. This narrow bandwidth allows many SSB stations to operate in a small frequency range - you might have stations every 3-4 kHz. Compare this to FM, which needs 15 kHz per station. The 3 kHz bandwidth carries all the audio frequencies needed for clear voice communication.
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.