*Question T4B06:
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?*  

*Correct Answer is  D: The RIT or Clarifier*  

### AI Response: (may contain errors)  

To address the question regarding the voice pitch of a single-sideband (SSB) signal, let's break down the correct answer and the other options.

### Correct Answer: D: The RIT or Clarifier

- **RIT (Receiver Incremental Tuning)** or **Clarifier** is used to fine-tune the frequency of the received signal. 
- When the pitch of an SSB signal sounds too high or low, it often indicates that the signal is slightly off-frequency. 
- Adjusting the RIT or Clarifier allows you to shift the frequency of the received audio, correcting the pitch to a more natural sound.

### Why the Other Choices are Incorrect:

- **A: The AGC or limiter**
  - **Automatic Gain Control (AGC)** adjusts the overall gain of the receiver to maintain a consistent audio level. 
  - It does not affect the pitch of the audio signal; it only helps in managing volume levels.

- **B: The bandwidth selection**
  - Bandwidth selection affects the range of frequencies that the receiver processes. 
  - While it can improve signal clarity by filtering out unwanted noise, it does not directly change the pitch of the audio signal.

- **C: The tone squelch**
  - Tone squelch is used to mute the audio output unless a specific tone is detected. 
  - It does not adjust the pitch of the audio; it simply controls whether you hear the signal based on the presence of a tone.

### Summary

In summary, the RIT or Clarifier is the appropriate control to adjust when the voice pitch of an SSB signal is not correct. The other options serve different functions that do not directly influence the pitch of the audio signal. 

This understanding is crucial for effectively managing SSB communications in amateur radio.