*Question E3B02:
What is the approximate maximum range for signals using transequatorial propagation?*  

*Correct Answer is  C: 5,000 miles*  

### AI Response: (may contain errors)  

Transequatorial propagation occurs when radio signals travel along the Earth's magnetic equator, allowing for long-distance communication, especially on the HF bands. 

### Correct Answer: 5,000 miles

1. **Why the correct answer is correct:**
   - Transequatorial propagation can allow signals to travel significant distances, typically up to about 5,000 miles. This is due to the unique ionospheric conditions near the equator, which can reflect signals effectively over long distances.

2. **Why the other choices are incorrect:**
   - **A: 1,000 miles**: This distance is too short for transequatorial propagation, which is known for covering much larger ranges.
   - **B: 2,500 miles**: While this is a more reasonable distance, it still underestimates the potential range of transequatorial propagation.
   - **D: 7,500 miles**: This distance exceeds the typical range for transequatorial propagation. While some exceptional conditions might allow for longer distances, 5,000 miles is the more accurate maximum under normal circumstances.

### Useful Information:
- Transequatorial propagation is most effective during certain times of the year and is influenced by solar activity.
- It is primarily utilized on HF bands, particularly 10, 12, and 15 meters.

Understanding these factors will help you grasp the concept of transequatorial propagation and its limitations, which is essential for the Extra Class exam.