*Question G8C02:
Which digital mode is used as a low-power beacon for assessing HF propagation?*  

*Correct Answer is  A: WSPR*  

### AI Response: (may contain errors)  

The correct answer to the question is **A: WSPR**. 

### Explanation of the Correct Answer:
- **WSPR (Weak Signal Propagation Reporter)** is specifically designed for low-power beacon operation. It allows amateur radio operators to assess HF propagation conditions by transmitting very low power signals (often as low as 5 mW) and receiving reports from stations that hear them. This mode is particularly effective for monitoring long-distance propagation and is widely used in the amateur radio community for this purpose.

### Why the Other Choices are Incorrect:
- **B: MFSK16**: 
  - MFSK16 (Multi-Frequency Shift Keying) is a digital mode used for text communication, but it is not specifically designed for beaconing or propagation assessment. It is more suited for real-time communication rather than low-power beaconing.

- **C: PSK31**: 
  - PSK31 (Phase Shift Keying) is another digital mode used for keyboard-to-keyboard communication. While it can be used for low-power operation, it is not primarily intended for propagation assessment like WSPR.

- **D: SSB-SC**: 
  - SSB-SC (Single Sideband Suppressed Carrier) is an analog voice mode used for communication. It is not a digital mode and is not used for beaconing or assessing propagation in the same way that WSPR is.

### Summary:
- WSPR is the only mode among the options that is specifically designed for low-power beaconing and propagation assessment. The other modes are primarily focused on communication rather than propagation studies.

### Useful Rule of Thumb:
- When considering modes for propagation assessment, look for those designed for low power and automated reporting, such as WSPR, which is optimized for this purpose.