*Question G2A06:
Which of the following is an advantage of using single sideband, as compared to other analog voice modes on the HF amateur bands?*  

*Correct Answer is  D: Less bandwidth used and greater power efficiency*  

### AI Response: (may contain errors)  

Single sideband (SSB) is a popular mode for voice communication on the HF amateur bands due to its efficiency and effectiveness. Let's break down why the correct answer is "Less bandwidth used and greater power efficiency" and why the other choices are incorrect.

### Correct Answer: D - Less bandwidth used and greater power efficiency

1. **Less Bandwidth Used**:  
   - SSB only transmits one sideband (either upper or lower) and suppresses the carrier, which significantly reduces the bandwidth required.  
   - Typical SSB bandwidth is about 2.4 kHz, compared to 6 kHz for AM (amplitude modulation).

2. **Greater Power Efficiency**:  
   - By not transmitting the carrier and one of the sidebands, more power is concentrated in the remaining sideband, making SSB more power-efficient.  
   - This means more of the transmitter's power is used for the actual transmission of information, improving the signal-to-noise ratio.

### Why the Other Choices are Incorrect:

- **Choice A: Very high-fidelity voice modulation**  
  - SSB does not provide high-fidelity audio. It is optimized for intelligibility and efficiency, not audio quality. Modes like AM or FM are better for high-fidelity audio.

- **Choice B: Less subject to interference from atmospheric static crashes**  
  - SSB is not inherently less susceptible to static crashes. Atmospheric noise affects all modes, but SSB's narrower bandwidth can sometimes make it easier to filter out noise.

- **Choice C: Ease of tuning on receive and immunity to impulse noise**  
  - SSB requires precise tuning to properly demodulate the signal, which can be more challenging than modes like AM or FM. It is not immune to impulse noise; however, its narrower bandwidth can help reduce the impact of noise.

In summary, SSB is favored for its efficient use of bandwidth and power, making it ideal for long-distance HF communication where these factors are crucial.