*Question E4C03:
What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?*  

*Correct Answer is  C: Capture effect*  

### AI Response: (may contain errors)  

The correct answer to the question is **C: Capture effect**. 

### Explanation of the Correct Answer:
- **Capture Effect**: This term describes the phenomenon in FM (Frequency Modulation) receivers where a stronger signal can effectively "capture" the receiver's attention, suppressing the weaker signal that is also present on the same frequency. This results in the receiver primarily demodulating the stronger signal, while the weaker one is largely ignored.

### Why the Other Choices are Incorrect:
- **A: Desensitization**: This occurs when a strong signal reduces the receiver's ability to respond to weaker signals, but it does not specifically refer to the suppression of one signal by another. Instead, it describes a general reduction in sensitivity.

- **B: Cross-modulation interference**: This refers to a situation where a strong signal modulates the amplitude of a weaker signal, causing distortion. It is not the same as the capture effect, which is about the selection of one signal over another.

- **D: Frequency discrimination**: This is the ability of a receiver to differentiate between signals at different frequencies. It does not pertain to the suppression of one signal by another on the same frequency.

### Summary:
- The **capture effect** is a key concept in FM reception, allowing the receiver to focus on the stronger signal and ignore weaker ones. Understanding this concept is crucial for effective communication in amateur radio.

No specific formulas are needed for this concept, but remember that the capture effect is a fundamental characteristic of FM systems that enhances their performance in crowded frequency environments.