*Question E1C12:
[97.305(c)] In what portion of the 630-meter band are phone emissions permitted?*  

*Correct Answer is  D: The entire band*  

### AI Response: (may contain errors)  

In the context of the 630-meter band, it's important to understand the regulations regarding emission types and their permitted frequency ranges. The 630-meter band is allocated for amateur radio use, and specific rules govern what types of emissions can be used in different parts of the band.

### Explanation:

1. **Correct Answer: D - The entire band**

   - **Why it's correct:**  
     According to FCC regulations, phone emissions are permitted throughout the entire 630-meter band. This means that operators can use voice communication (phone emissions) anywhere within this band without restriction to specific sub-bands.

2. **Why the other choices are incorrect:**

   - **Choice A: None**  
     This choice is incorrect because it suggests that phone emissions are not allowed at all on the 630-meter band, which contradicts the FCC rules that permit phone emissions across the entire band.

   - **Choice B: Only the top 3 kHz**  
     This choice is incorrect because it limits phone emissions to only the top 3 kHz of the band, which is not supported by the regulations. The entire band is available for phone emissions.

   - **Choice C: Only the bottom 3 kHz**  
     Similar to choice B, this is incorrect because it restricts phone emissions to only the bottom 3 kHz of the band. Again, the regulations allow for phone emissions throughout the entire band.

### Useful Rule of Thumb:

- **Emission Types:**  
  The FCC Part 97 rules specify the types of emissions allowed on amateur bands. For the 630-meter band, phone emissions are allowed across the entire band, providing flexibility for voice communication.

Understanding these rules helps ensure compliance with FCC regulations and effective use of the 630-meter band for amateur radio operations.