*Question E1A02:
[97.301, 97.305] When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the lowest frequency at which a properly adjusted LSB emission will be totally within the band?*  

*Correct Answer is  D: 3 kHz above the lower band edge*  

### AI Response: (may contain errors)  

When using a transceiver that displays the carrier frequency of phone signals, it's important to understand how the sideband emissions fit within the allocated band. For Lower Sideband (LSB) emissions, the carrier frequency is at the upper edge of the signal, and the sideband extends downward in frequency.

### Explanation:

1. **Correct Answer: D: 3 kHz above the lower band edge**

   - **Why it's correct:**  
     LSB signals have their carrier frequency at the upper edge of the signal. The bandwidth of a typical LSB phone signal is approximately 3 kHz. Therefore, to ensure the entire signal is within the band, the carrier frequency must be at least 3 kHz above the lower band edge. This ensures that the entire 3 kHz bandwidth of the LSB signal fits within the band.

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

   - **A: The exact lower band edge**  
     If the carrier frequency is set at the exact lower band edge, the LSB signal will extend 3 kHz below the band edge, causing out-of-band emissions, which is not allowed.

   - **B: 300 Hz above the lower band edge**  
     Setting the carrier frequency only 300 Hz above the lower band edge means that 2.7 kHz of the signal will still be outside the band, which is not permissible.

   - **C: 1 kHz above the lower band edge**  
     With the carrier frequency 1 kHz above the lower band edge, 2 kHz of the signal will still be outside the band, which is also not allowed.

### Rule of Thumb:

- For LSB, ensure the carrier frequency is at least the bandwidth of the signal (typically 3 kHz) above the lower band edge to keep the entire signal within the band. This avoids any part of the signal from extending outside the allocated frequency range.