When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?
The correct answer is C: 2 kHz to 3 kHz. When selecting an SSB transmitting frequency, a minimum separation of 2 kHz to 3 kHz should be used to minimize interference to stations on adjacent frequencies. SSB signals use about 3 kHz bandwidth, so this spacing prevents overlap. For amateur radio operators, this spacing ensures clear communications without interfering with adjacent stations. Understanding this helps when finding a clear frequency for SSB operation.
Exam Tip
SSB frequency spacing = 2-3 kHz. Think 'S'SB = 'S'pread out 'S'ignals (~3 kHz), so 'S'pacing of 2-3 kHz needed. Minimum separation of 2-3 kHz prevents interference. Not 5-50 Hz or 150-500 Hz (too close), not 6 kHz (too wide).
Memory Aid
"SSB frequency spacing = 2-3 kHz. Think 'S'SB = 'S'pread out 'S'ignals (~3 kHz), so 'S'pacing needed. Minimum 2-3 kHz separation prevents interference. SSB signals are wider than CW, so more spacing is required."
Real-World Application
You want to operate SSB on 20 meters. You find a station on 14.200 MHz. You select 14.203 MHz (3 kHz away) - this 3 kHz separation is within the 2-3 kHz range and prevents interference. SSB signals are wider than CW, so more spacing is needed. CW would only need 150-500 Hz.
Key Concepts
Why Other Options Are Wrong
Option A (5-50 Hz): Incorrect. 5-50 Hz is way too close - SSB signals are about 3 kHz wide, so this would cause severe overlap and interference.
Option B (150-500 Hz): Incorrect. 150-500 Hz is CW spacing - SSB needs more separation because SSB signals are wider (about 3 kHz).
Option D (Approximately 6 kHz): Incorrect. 6 kHz is wider than necessary - 2-3 kHz is sufficient for SSB signals.
题目解析
The correct answer is C: 2 kHz to 3 kHz. When selecting an SSB transmitting frequency, a minimum separation of 2 kHz to 3 kHz should be used to minimize interference to stations on adjacent frequencies. SSB signals use about 3 kHz bandwidth, so this spacing prevents overlap. For amateur radio operators, this spacing ensures clear communications without interfering with adjacent stations. Understanding this helps when finding a clear frequency for SSB operation.
考试技巧
SSB frequency spacing = 2-3 kHz. Think 'S'SB = 'S'pread out 'S'ignals (~3 kHz), so 'S'pacing of 2-3 kHz needed. Minimum separation of 2-3 kHz prevents interference. Not 5-50 Hz or 150-500 Hz (too close), not 6 kHz (too wide).
记忆口诀
SSB frequency spacing = 2-3 kHz. Think 'S'SB = 'S'pread out 'S'ignals (~3 kHz), so 'S'pacing needed. Minimum 2-3 kHz separation prevents interference. SSB signals are wider than CW, so more spacing is required.
实际应用示例
You want to operate SSB on 20 meters. You find a station on 14.200 MHz. You select 14.203 MHz (3 kHz away) - this 3 kHz separation is within the 2-3 kHz range and prevents interference. SSB signals are wider than CW, so more spacing is needed. CW would only need 150-500 Hz.
错误选项分析
Option A (5-50 Hz): Incorrect. 5-50 Hz is way too close - SSB signals are about 3 kHz wide, so this would cause severe overlap and interference. Option B (150-500 Hz): Incorrect. 150-500 Hz is CW spacing - SSB needs more separation because SSB signals are wider (about 3 kHz). Option D (Approximately 6 kHz): Incorrect. 6 kHz is wider than necessary - 2-3 kHz is sufficient for SSB signals.
知识点
SSB frequency spacing, Frequency separation, Interference prevention, SSB operation
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.