*Question E4A03:
Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter?*  

*Correct Answer is  B: Spectrum analyzer*  

### AI Response: (may contain errors)  

To determine which test instrument is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter, we analyze each option:

### Correct Answer: Spectrum Analyzer

- **Why it's correct**: A spectrum analyzer is specifically designed to measure and display the frequency spectrum of signals. It can show the amplitude of signals across a range of frequencies, making it ideal for identifying spurious signals and intermodulation distortion products. This capability is crucial for ensuring that an SSB transmitter operates within its specified frequency limits and does not generate unwanted signals.

### Why the Other Choices are Incorrect:

- **A: Differential Resolver**  
  - **Explanation**: A differential resolver is used primarily in applications involving phase measurements and is not designed for analyzing frequency spectra. It does not provide the necessary information about spurious signals or intermodulation distortion.

- **C: Logic Analyzer**  
  - **Explanation**: A logic analyzer is used to capture and analyze digital signals. It is effective for debugging digital circuits but does not measure or display analog signals or frequency components, making it unsuitable for analyzing SSB transmitters.

- **D: Network Analyzer**  
  - **Explanation**: A network analyzer is used to measure the network parameters of electrical networks, such as impedance and reflection coefficients. While it can analyze some aspects of RF circuits, it does not provide a frequency spectrum display like a spectrum analyzer does, and thus is not suitable for identifying spurious signals.

### Summary

- **Spectrum Analyzer**: Best for displaying frequency components, including spurious signals and intermodulation distortion.
- **Differential Resolver**: Not for frequency analysis.
- **Logic Analyzer**: Not for analog signal analysis.
- **Network Analyzer**: Not for displaying frequency spectra.

Understanding the specific functions of these instruments is key for effective troubleshooting and ensuring compliance with transmission standards in amateur radio.