Which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter?
The correct answer is D: LSB. The mode normally used when sending RTTY signals via AFSK with an SSB transmitter is LSB (Lower Sideband). RTTY on HF typically uses LSB, similar to voice on lower HF bands. For amateur radio operators, this ensures compatibility - everyone uses LSB for RTTY on HF. Understanding this helps when operating RTTY.
Exam Tip
RTTY via AFSK with SSB = LSB. Think 'R'TTY on 'H'F = 'L'ower 'S'ideband. RTTY on HF typically uses LSB, similar to voice on lower HF bands. Not USB (higher frequencies), not DSB or CW - LSB is standard for HF RTTY.
Memory Aid
"RTTY via AFSK with SSB = LSB. Think 'R'TTY on 'H'F = 'L'ower 'S'ideband. RTTY on HF typically uses LSB. Standard for HF RTTY operation, similar to voice on lower HF bands."
Real-World Application
You operate RTTY on 20 meters using AFSK with an SSB transmitter. You use LSB (Lower Sideband) - this is the standard for RTTY on HF. Everyone uses LSB for RTTY on HF, ensuring compatibility. USB might be used on higher frequencies, but LSB is standard for most HF RTTY operation.
Key Concepts
Why Other Options Are Wrong
Option A (USB): Incorrect. USB is used for RTTY on higher frequencies, but on most HF bands, RTTY uses LSB. LSB is the standard for HF RTTY.
Option B (DSB): Incorrect. DSB (Double Sideband) isn't used for RTTY - RTTY uses SSB (Single Sideband), specifically LSB on HF.
Option C (CW): Incorrect. CW is a different mode - this question is about RTTY, not CW. RTTY uses LSB, not CW.
题目解析
The correct answer is D: LSB. The mode normally used when sending RTTY signals via AFSK with an SSB transmitter is LSB (Lower Sideband). RTTY on HF typically uses LSB, similar to voice on lower HF bands. For amateur radio operators, this ensures compatibility - everyone uses LSB for RTTY on HF. Understanding this helps when operating RTTY.
考试技巧
RTTY via AFSK with SSB = LSB. Think 'R'TTY on 'H'F = 'L'ower 'S'ideband. RTTY on HF typically uses LSB, similar to voice on lower HF bands. Not USB (higher frequencies), not DSB or CW - LSB is standard for HF RTTY.
记忆口诀
RTTY via AFSK with SSB = LSB. Think 'R'TTY on 'H'F = 'L'ower 'S'ideband. RTTY on HF typically uses LSB. Standard for HF RTTY operation, similar to voice on lower HF bands.
实际应用示例
You operate RTTY on 20 meters using AFSK with an SSB transmitter. You use LSB (Lower Sideband) - this is the standard for RTTY on HF. Everyone uses LSB for RTTY on HF, ensuring compatibility. USB might be used on higher frequencies, but LSB is standard for most HF RTTY operation.
错误选项分析
Option A (USB): Incorrect. USB is used for RTTY on higher frequencies, but on most HF bands, RTTY uses LSB. LSB is the standard for HF RTTY. Option B (DSB): Incorrect. DSB (Double Sideband) isn't used for RTTY - RTTY uses SSB (Single Sideband), specifically LSB on HF. Option C (CW): Incorrect. CW is a different mode - this question is about RTTY, not CW. RTTY uses LSB, not CW.
知识点
RTTY, AFSK, LSB, Digital modes
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.