Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low?
The correct answer is D: The RIT or Clarifier. When a single-sideband signal returning to your CQ call seems too high or low in pitch, you can use the RIT (Receiver Incremental Tuning) or Clarifier to adjust your receive frequency slightly to match the other station's transmit frequency.
On SSB, if the other station's frequency is slightly off from yours (or if there's a frequency error), their voice will sound too high-pitched (like chipmunks) or too low-pitched. The RIT/Clarifier allows you to tune your receiver slightly without changing your transmit frequency, so you can 'tune in' the other station's actual frequency and hear them at normal pitch. This is a common adjustment needed in SSB operation.
Exam Tip
SSB pitch wrong = Use RIT/Clarifier. Remember: If an SSB signal sounds too high or low in pitch, use the RIT (Receiver Incremental Tuning) or Clarifier to adjust your receive frequency to match theirs.
Memory Aid
"**S**SB **P**itch = **R**IT/**C**larifier (think 'SP = RC' = RIT/Clarifier)"
Real-World Application
You call CQ on 28.400 MHz SSB, and a station responds. Their voice sounds too high-pitched (like chipmunks), indicating their transmit frequency is slightly higher than your receive frequency. You use the RIT control to tune your receiver up slightly (maybe to 28.401 MHz) without changing your transmit frequency. Now their voice sounds normal. The RIT lets you 'tune in' their actual frequency.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. AGC (Automatic Gain Control) or limiter affects signal strength, not pitch. It won't fix high or low voice pitch.
Option B: Incorrect. Bandwidth selection affects how much of the signal you receive, not the pitch. Narrower bandwidth might help with interference but won't fix pitch.
Option C: Incorrect. Tone squelch is for CTCSS tones, not for adjusting voice pitch. It's unrelated to frequency/pitch issues.
题目解析
The correct answer is D: The RIT or Clarifier. When a single-sideband signal returning to your CQ call seems too high or low in pitch, you can use the RIT (Receiver Incremental Tuning) or Clarifier to adjust your receive frequency slightly to match the other station's transmit frequency. On SSB, if the other station's frequency is slightly off from yours (or if there's a frequency error), their voice will sound too high-pitched (like chipmunks) or too low-pitched. The RIT/Clarifier allows you to tune your receiver slightly without changing your transmit frequency, so you can 'tune in' the other station's actual frequency and hear them at normal pitch. This is a common adjustment needed in SSB operation.
考试技巧
SSB pitch wrong = Use RIT/Clarifier. Remember: If an SSB signal sounds too high or low in pitch, use the RIT (Receiver Incremental Tuning) or Clarifier to adjust your receive frequency to match theirs.
记忆口诀
**S**SB **P**itch = **R**IT/**C**larifier (think 'SP = RC' = RIT/Clarifier)
实际应用示例
You call CQ on 28.400 MHz SSB, and a station responds. Their voice sounds too high-pitched (like chipmunks), indicating their transmit frequency is slightly higher than your receive frequency. You use the RIT control to tune your receiver up slightly (maybe to 28.401 MHz) without changing your transmit frequency. Now their voice sounds normal. The RIT lets you 'tune in' their actual frequency.
错误选项分析
Option A: Incorrect. AGC (Automatic Gain Control) or limiter affects signal strength, not pitch. It won't fix high or low voice pitch. Option B: Incorrect. Bandwidth selection affects how much of the signal you receive, not the pitch. Narrower bandwidth might help with interference but won't fix pitch. Option C: Incorrect. Tone squelch is for CTCSS tones, not for adjusting voice pitch. It's unrelated to frequency/pitch issues.
知识点
RIT, Clarifier, SSB, Frequency adjustment
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.