*Question T1B10:
[97.305(c)] Where may SSB phone be used in amateur bands above 50 MHz?*  

*Correct Answer is  C: In at least some segment of all these bands*  

### AI Response: (may contain errors)  

To understand where SSB (Single Sideband) phone may be used in amateur bands above 50 MHz, let's analyze the correct answer and the other options.

### Correct Answer: C - In at least some segment of all these bands

- **Explanation**: SSB phone operation is permitted in various segments of the amateur bands above 50 MHz. The FCC regulations allow SSB phone in the 6-meter band (50-54 MHz) and higher frequency bands, as long as the operator adheres to the band plans and any specific restrictions that may apply to those bands. This means that SSB can be used in at least some segments of all amateur bands above 50 MHz.

### Why the Other Choices are Incorrect:

- **A: Only in sub-bands allocated to General class or higher licensees**  
  - **Explanation**: This choice is incorrect because SSB phone is not restricted solely to General class or higher licensees. While certain bands may have restrictions based on license class, SSB is allowed in segments accessible to Technician class operators as well.

- **B: Only on repeaters**  
  - **Explanation**: This choice is incorrect because SSB phone operation is not limited to repeaters. SSB can be used for direct communication on the HF and VHF/UHF bands, not just through repeaters.

- **D: On any band if the power is limited to 25 watts**  
  - **Explanation**: This choice is incorrect because there is no blanket rule that allows SSB operation on any band simply by limiting power to 25 watts. Each band has specific regulations and allowed modes of operation, and SSB is not universally permitted across all bands regardless of power.

### Summary

- SSB phone is allowed in various segments of amateur bands above 50 MHz, making option C the correct choice.
- Always refer to the band plans and regulations for specific restrictions and allowances for different modes of operation.

This understanding is crucial for the Extra Class exam and for practical amateur radio operation.