*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)  

To understand spurious emissions, let's break down the correct answer and the other choices.

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

- **Explanation**: 
  - A spurious emission is any signal that is not part of the intended transmission and occurs outside the necessary bandwidth of the signal. 
  - These emissions can cause interference with other communications and are typically unwanted. 
  - The key point is that they can be reduced or eliminated without impacting the main information being transmitted.

### Why the Other Choices are Incorrect:

- **A: An amateur station transmission made without the proper call sign identification**  
  - This describes a violation of regulations rather than a spurious emission. Proper identification is a requirement for all amateur transmissions.

- **B: A signal transmitted to prevent its detection by any station other than the intended recipient**  
  - This refers to a form of secure communication, which is not classified as a spurious emission. Spurious emissions are unintentional and not designed for secrecy.

- **C: Any transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level**  
  - While this describes interference, it does not specifically define a spurious emission. The 40 dB level is a threshold for interference but does not encompass all spurious emissions, which are defined by their bandwidth characteristics.

### Summary:
- **Spurious emissions** are unwanted signals outside the necessary bandwidth of a transmission.
- They can be reduced without affecting the main signal, which is why option D is correct.

### Useful Rule of Thumb:
- Always ensure your transmission stays within the allocated bandwidth to avoid spurious emissions and potential interference with other stations.