*Question G4D10:
How close to the lower edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?*  

*Correct Answer is  A: At least 3 kHz above the edge of the segment*  

### AI Response: (may contain errors)  

To determine how close to the lower edge of a band’s phone segment your displayed carrier frequency should be when using a 3 kHz wide Lower Sideband (LSB) signal, we need to consider the bandwidth of the signal and the need to avoid interference with adjacent channels.

### Correct Answer: 
**At least 3 kHz above the edge of the segment (Choice A)**

#### Explanation:
- When using LSB, the carrier frequency is the frequency at which you set your transmitter. The actual signal occupies bandwidth below this frequency.
- For a 3 kHz wide LSB signal, the lower edge of the signal will be at the carrier frequency minus 3 kHz. 
- To ensure that the lower edge of your signal does not interfere with the lower edge of the phone segment, you must set your carrier frequency at least 3 kHz above the edge of the segment. This ensures that the entire signal remains within the allocated band and does not encroach on adjacent frequencies.

### Why the Other Choices are Incorrect:
- **Choice B: At least 3 kHz below the edge of the segment**
  - This would place the carrier frequency too low, causing the lower edge of the 3 kHz wide LSB signal to fall below the band edge, leading to potential interference with other users.

- **Choice C: At least 1 kHz below the edge of the segment**
  - Similar to Choice B, this would also place the carrier frequency too low, allowing the lower edge of the signal to infringe upon the adjacent band, which is not compliant with regulations.

- **Choice D: At least 1 kHz above the edge of the segment**
  - While this might seem safer than the previous choices, it is still insufficient. A 1 kHz separation does not account for the full width of the 3 kHz signal, which could still overlap with the adjacent band.

### Summary:
To avoid interference and comply with regulations, always set your carrier frequency for a 3 kHz wide LSB signal at least 3 kHz above the lower edge of the band segment. This ensures that the entire signal remains within the designated frequency range.