*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 interference can cause the audio device to demodulate the SSB signal unintentionally. This results in:

- **Distorted speech**: The audio device is not designed to properly demodulate SSB signals, so the speech will sound distorted. This is why the correct answer is **C: Distorted speech**.

### Explanation of Other Choices:

- **A: A steady hum whenever the transmitter is on the air**  
  A steady hum is typically associated with power line interference or issues with grounding, not RF interference from an SSB transmitter.

- **B: On-and-off humming or clicking**  
  On-and-off humming or clicking is more characteristic of intermittent interference, such as that from a spark or a switching power supply, rather than continuous RF interference from an SSB transmitter.

- **D: Clearly audible speech**  
  Clearly audible speech would imply that the audio device is correctly demodulating the SSB signal, which is unlikely unless the device is specifically designed for that purpose.

### Key Points:

- **SSB Modulation**: SSB is a form of amplitude modulation that uses only one sideband and suppresses the carrier. It requires precise demodulation to recover the original audio signal.
- **Interference**: When an audio device picks up an SSB signal, it lacks the necessary circuitry to demodulate it correctly, leading to distorted audio output.

Understanding these concepts helps in identifying the nature of interference and the expected audio output from non-radio devices.