*Question G4C03:
What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter?*  

*Correct Answer is  C: Distorted speech*  

### AI Response: (may contain errors)  

When an audio device experiences RF interference from a single sideband (SSB) phone transmitter, the correct answer is:

**C: Distorted speech**

### Explanation:

1. **Why the correct answer is correct:**
   - SSB transmitters modulate audio signals onto a radio frequency carrier. When RF interference occurs, it can mix with the audio signal, leading to distortion. This distortion manifests as garbled or unclear speech, which is characteristic of the interference from SSB signals. The audio device may pick up the modulated RF signal, causing the speech to sound distorted rather than clear.

2. **Why the other choices are incorrect:**
   - **A: A steady hum whenever the transmitter is on the air**  
     - A steady hum is more typical of power line interference or ground loops, not specifically from SSB interference.
   - **B: On-and-off humming or clicking**  
     - This type of noise is often associated with digital signals or intermittent interference, rather than the continuous nature of SSB modulation.
   - **D: Clearly audible speech**  
     - If the speech were clearly audible, it would indicate that the audio device is receiving the signal properly without interference, which contradicts the premise of experiencing RF interference.

### Summary:
In summary, RF interference from an SSB transmitter typically results in distorted speech due to the way the audio signal interacts with the RF carrier. Understanding the nature of SSB modulation helps clarify why distorted speech is the expected outcome in this scenario.