*Question E1A04:
[97.301, 97.305] May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?*  

*Correct Answer is  C: No, the sideband components will extend beyond the edge of the phone band segment*  

### AI Response: (may contain errors)  

To understand why the correct answer to this question is "No, the sideband components will extend beyond the edge of the phone band segment," let's break down the relevant concepts.

### Explanation of the Correct Answer:
- **SSB Emission**: Single Sideband (SSB) is a type of amplitude modulation that uses only one of the sidebands and suppresses the carrier. 
- **Bandwidth of SSB**: The bandwidth of an SSB signal is typically about 3 kHz. This means that if you transmit at 3.601 MHz, the signal will occupy frequencies from approximately 3.598 MHz to 3.604 MHz.
- **Phone Band Segment**: For Extra class operators, the phone band segment on 75 meters starts at 3.610 MHz. Therefore, transmitting at 3.601 MHz would extend into frequencies below 3.610 MHz, which is outside the allowed phone band for Extra class operators.

### Why the Other Choices are Incorrect:
- **Choice A**: "Yes, the entire signal will be inside the SSB allocation for Extra class operators."
  - This is incorrect because, as explained, the sideband components extend below 3.610 MHz, violating the allocation rules.
  
- **Choice B**: "Yes, the displayed frequency is within the 75-meter phone band segment."
  - This is misleading. While 3.601 MHz is technically within the 75-meter band, it is not within the phone segment for Extra class operators, which starts at 3.610 MHz.
  
- **Choice D**: "No, US stations are not permitted to use phone emissions below 3.610 MHz."
  - This is partially true but not the best explanation. The key issue is the sideband components extending below the allowed frequency, not just the prohibition of phone emissions.

### Summary:
- The correct answer highlights the importance of understanding the bandwidth of SSB signals and the specific frequency allocations for different classes of operators. 

### Useful Rules of Thumb:
- **SSB Bandwidth**: An SSB signal typically occupies about 3 kHz.
- **Phone Band Allocation**: Always check the specific frequency allocations for your license class to ensure compliance.

This understanding is crucial for operating within legal limits and for passing the Extra Class exam.