*Question T8D09:
What is CW?*  

*Correct Answer is  D: Another name for a Morse code transmission*  

### AI Response: (may contain errors)  

CW stands for Continuous Wave, which is another name for Morse code transmission. Here's a breakdown of the question:

### Correct Answer: D - Another name for a Morse code transmission
- **Explanation**: 
  - CW is a method of transmitting information using on-off keying of an unmodulated radio wave. In this context, it refers specifically to Morse code, where the presence and absence of the signal represent dots and dashes, respectively. This technique has been widely used in amateur radio for many years.

### Why the Other Choices are Incorrect:
- **A: A type of electromagnetic propagation**  
  - **Explanation**: This choice refers to how radio waves travel through different mediums (like ionosphere, ground, etc.), but CW itself is not a propagation method; it is a transmission technique.

- **B: A digital mode used primarily on 2 meter FM**  
  - **Explanation**: While there are digital modes used on 2 meter FM (like D-STAR or Packet), CW is not classified as a digital mode. It is an analog method of communication.

- **C: A technique for coil winding**  
  - **Explanation**: This choice refers to a method used in electrical engineering for creating inductors or transformers, which is unrelated to the concept of CW in radio communications.

### Summary
- CW is synonymous with Morse code transmission, utilizing a simple on-off keying method to convey messages. Understanding this distinction is crucial for the Extra Class exam, as it highlights the historical and practical aspects of amateur radio communication.