*Question G4B12:
What effect can strong signals from nearby transmitters have on an antenna analyzer?*  

*Correct Answer is  B: Received power that interferes with SWR readings*  

### AI Response: (may contain errors)  

To understand the effects of strong signals from nearby transmitters on an antenna analyzer, let's analyze the choices provided.

### Correct Answer: 
**A: Desensitization which can cause intermodulation products which interfere with impedance readings**

- **Explanation**: Strong signals can desensitize the antenna analyzer, meaning it becomes less responsive to weaker signals. This desensitization can lead to intermodulation distortion, where two or more signals mix and create additional unwanted frequencies. These intermodulation products can interfere with the analyzer's ability to accurately measure impedance, leading to incorrect readings.

### Why the Other Choices are Incorrect:

- **B: Received power that interferes with SWR readings**  
  - **Explanation**: While strong signals can affect readings, the primary issue is not just the received power but how it desensitizes the analyzer and creates intermodulation products. SWR (Standing Wave Ratio) readings can be affected, but the main concern is the distortion caused by intermodulation rather than just received power.

- **C: Generation of harmonics which interfere with frequency readings**  
  - **Explanation**: Although harmonics can be generated by strong signals, the primary issue with antenna analyzers is not the generation of harmonics but rather the desensitization and intermodulation products. Harmonics may affect some measurements, but they are not the main concern in this context.

- **D: All these choices are correct**  
  - **Explanation**: Since only choice A accurately describes the primary effect of strong signals on an antenna analyzer, this option is incorrect. The other choices do not fully capture the main issue.

### Summary:
- Strong signals can desensitize an antenna analyzer, leading to intermodulation products that interfere with impedance readings.
- The correct answer is A, as it directly addresses the primary concern of desensitization and its effects.

### Useful Rule of Thumb:
- When using an antenna analyzer, ensure that nearby strong signals are minimized to avoid inaccurate readings due to desensitization and intermodulation effects.