*Question E9E02:
What antenna matching system matches coaxial cable to an antenna by connecting the shield to the center of the antenna and the conductor a fraction of a wavelength to one side?*  

*Correct Answer is  A: Gamma match*  

### AI Response: (may contain errors)  

The correct answer is **Gamma match**.

### Explanation:

1. **Why the correct answer is correct:**
   - The **Gamma match** is a method used to match a coaxial cable to an antenna, typically a Yagi or dipole. In this system, the shield of the coaxial cable is connected to the center of the antenna, while the center conductor is connected to a point on the antenna element that is a fraction of a wavelength away from the center. This creates an unbalanced to balanced transformation, allowing the coaxial cable (unbalanced) to feed the antenna (balanced).

2. **Why the other choices are incorrect:**
   - **Delta match:** This is a different matching system that uses a triangular or delta-shaped wire configuration to match the impedance of a balanced feedline to an antenna. It does not involve connecting the shield to the center of the antenna.
   - **T-match:** This system involves a balanced feedline and uses a T-shaped configuration to match the impedance. It is often used with folded dipoles and does not involve connecting the shield to the center of the antenna.
   - **Stub match:** This method uses a short section of transmission line (stub) to match impedances. It does not involve connecting the shield to the center of the antenna and is typically used for tuning rather than direct matching.

### Useful Concepts:

- **Gamma Match Configuration:**
  - The gamma match is effective for antennas where a direct connection to the center is not feasible or desired. It allows for easy adjustment of the matching point by sliding the connection along the antenna element.
  
- **Impedance Matching:**
  - The goal of any matching system is to ensure that the impedance of the transmission line (coaxial cable) matches the impedance of the antenna to maximize power transfer and minimize reflections.

Understanding these concepts will help you identify the correct matching system for different antenna configurations.