*Question E1B01:
[97.3] Which of the following constitutes a spurious emission?*  

*Correct Answer is  D: An emission outside the signal’s necessary bandwidth that can be reduced or eliminated without affecting the information transmitted*  

### AI Response: (may contain errors)  

A spurious emission is defined as an emission outside the necessary bandwidth of a signal that can be reduced or eliminated without affecting the information being transmitted. This is important because spurious emissions can cause interference with other communications and are generally undesirable.

### Explanation:

1. **Correct Answer (D):**  
   - **Spurious Emission Definition:** A spurious emission is any signal that is outside the necessary bandwidth and can be reduced or eliminated without affecting the information being transmitted. This is the correct choice because it aligns with the definition provided by the FCC in Part 97.3.
   - **Necessary Bandwidth:** This is the bandwidth required to transmit the desired information at the rate and with the quality required under specified conditions.

2. **Why Other Choices Are Incorrect:**

   - **Choice A:**  
     - This choice refers to a procedural violation (not identifying with a call sign) rather than a technical issue with the signal itself. It does not relate to emissions or bandwidth.

   - **Choice B:**  
     - This describes a covert transmission, which is a different issue related to the intent of communication rather than the technical characteristics of the emission.

   - **Choice C:**  
     - This describes interference but does not specifically address emissions outside the necessary bandwidth. It also incorrectly specifies a level of 40 dB below the fundamental power level, which is not part of the definition of spurious emissions.

### Key Points:

- **Spurious Emissions:** These are unwanted emissions that can be reduced without affecting the main signal.
- **Interference:** While spurious emissions can cause interference, not all interference is due to spurious emissions.
- **Regulatory Compliance:** Understanding and controlling spurious emissions is crucial for compliance with FCC regulations and to prevent interference with other services.