*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 (TEP) is a mode of radio wave propagation that allows signals to travel over long distances by bouncing off the ionosphere near the equator. This mode is particularly effective for VHF and UHF frequencies.

### Explanation:

1. **Correct Answer: 5,000 miles (C)**
   - Transequatorial propagation typically allows signals to travel between 4,000 and 5,000 miles. This is because the ionospheric reflection points are located near the geomagnetic equator, allowing signals to cover large distances between the northern and southern hemispheres.

2. **Why Other Choices Are Incorrect:**
   - **1,000 miles (A):** This distance is too short for TEP, as it is more characteristic of ground wave or short skip propagation.
   - **2,500 miles (B):** While this distance is possible, it underestimates the typical range of TEP, which is generally longer.
   - **7,500 miles (D):** This distance is too long for TEP, as it exceeds the typical maximum range. Such distances would require multiple hops or different propagation modes.

### Useful Rule of Thumb:

- **TEP Range:** Typically between 4,000 and 5,000 miles, making 5,000 miles a reasonable estimate for the maximum range.

Understanding the characteristics of TEP helps in predicting when and how far signals can travel using this mode, especially during periods of high solar activity.