*Question E4D07:
Which of the following reduces the likelihood of receiver desensitization?*  

*Correct Answer is  A: Insert attenuation before the first RF stage*  

### AI Response: (may contain errors)  

To understand why inserting attenuation before the first RF stage reduces the likelihood of receiver desensitization, let's break down the concepts involved.

### Correct Answer: A - Insert attenuation before the first RF stage

- **Desensitization** occurs when a strong signal overloads the receiver, causing it to become less sensitive to weaker signals. 
- By inserting attenuation before the first RF stage, you reduce the strength of the incoming signal. This helps prevent the receiver from being overwhelmed by strong signals, allowing it to better detect weaker signals.

### Why the Other Choices are Incorrect:

- **B: Raise the receiver’s IF frequency**
  - Increasing the Intermediate Frequency (IF) can help with selectivity and image rejection, but it does not directly address the issue of desensitization. A higher IF frequency may still allow strong signals to cause overload.

- **C: Increase the receiver’s front-end gain**
  - Increasing front-end gain amplifies all incoming signals, including strong ones. This can exacerbate desensitization by making the receiver more susceptible to overload from strong signals.

- **D: Switch from fast AGC to slow AGC**
  - Automatic Gain Control (AGC) is designed to adjust the gain of the receiver based on the strength of the incoming signal. Switching to slow AGC may not respond quickly enough to strong signals, potentially leading to desensitization rather than reducing it.

### Summary

To mitigate receiver desensitization, inserting attenuation before the first RF stage is the most effective method. This approach helps manage the signal levels entering the receiver, ensuring that it can effectively process weaker signals without being overwhelmed by stronger ones.