*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, let's examine each option:

### Correct Answer: Spectrum Analyzer

1. **Why the correct answer is correct:**
   - A **spectrum analyzer** is designed to measure the magnitude of an input signal versus frequency within the full frequency range of the instrument. It is particularly useful for identifying and displaying spurious signals and intermodulation distortion products. These are unwanted signals that can appear at frequencies other than the intended transmission frequency, and a spectrum analyzer can visually display these on a frequency spectrum.

2. **Why the other choices are incorrect:**
   - **A: Differential Resolver**
     - A differential resolver is not used in radio frequency analysis. It is typically used in applications involving angular position sensing and is not relevant to measuring spurious signals or intermodulation distortion.
   - **C: Logic Analyzer**
     - A logic analyzer is used to capture and display multiple signals from a digital system or digital circuit. It is not suitable for analyzing RF signals or spurious emissions from an SSB transmitter.
   - **D: Network Analyzer**
     - A network analyzer is used to measure network parameters of electrical networks, often used for characterizing components like filters and amplifiers. While it can measure certain RF characteristics, it is not primarily used for displaying spurious signals or intermodulation distortion.

### Useful Concepts:

- **Spurious Signals:** Unwanted signals generated by a transmitter that can interfere with other communications.
- **Intermodulation Distortion:** Occurs when multiple signals mix together, creating additional unwanted frequencies.

A spectrum analyzer is the appropriate tool for visualizing these phenomena, making it the correct choice for this question.