*Question T8A03:
Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?*  

*Correct Answer is  C: SSB*  

### AI Response: (may contain errors)  

The correct answer to the question is C: SSB (Single Sideband). 

### Explanation of the Correct Answer:
- **SSB (Single Sideband)** is a voice mode that is particularly effective for long-distance communication, especially on VHF and UHF bands. 
- It is a form of amplitude modulation (AM) that uses less bandwidth and power than traditional AM, allowing for clearer signals over longer distances. 
- SSB is preferred for weak signal contacts because it can effectively filter out noise and interference, making it easier to hear distant stations.

### Why the Other Choices are Incorrect:
- **A: FM (Frequency Modulation)**  
  - FM is commonly used for local communications and provides good sound quality, but it is less effective for long-distance weak signal contacts due to its higher bandwidth requirements and susceptibility to fading.

- **B: DRM (Digital Radio Mondiale)**  
  - DRM is a digital broadcasting technology primarily used for AM and shortwave radio. It is not typically used for voice communications in amateur radio, especially on VHF and UHF bands.

- **D: PM (Phase Modulation)**  
  - PM is a modulation technique that is not commonly used in amateur voice communications. While it can be used in some digital modes, it is not a standard voice mode for long-distance contacts.

### Summary:
- SSB is the preferred mode for long-distance weak signal contacts due to its efficiency and ability to minimize noise.
- FM is better for local communications, while DRM and PM are not standard for voice in amateur radio.

This understanding will help you choose the right mode for effective communication in various situations.