*Question E2C11:
How should you generally identify your station when attempting to contact a DX station during a contest or in a pileup?*  

*Correct Answer is  A: Send your full call sign once or twice*  

### AI Response: (may contain errors)  

When attempting to contact a DX station during a contest or in a pileup, it's important to identify your station efficiently and clearly. Here's why the correct answer is to send your full call sign once or twice:

1. **Correct Answer: Send your full call sign once or twice (Choice A)**
   - **Reasoning**: Sending your full call sign once or twice is the most efficient way to identify yourself. It provides the necessary information for the DX station to recognize and log your call sign without causing unnecessary congestion on the frequency. This method is both courteous and effective in a busy contest environment.

2. **Why the other choices are incorrect:**
   - **Choice B: Send only the last two letters of your call sign until you make contact**
     - **Reasoning**: Sending only the last two letters of your call sign can lead to confusion and is not a complete identification. It may also be considered poor operating practice, as it does not provide the full information needed for the DX station to log your contact correctly.
   
   - **Choice C: Send your full call sign and grid square**
     - **Reasoning**: Including your grid square is unnecessary and can clutter the communication. During a contest or pileup, the focus is on making quick and efficient contacts, and the grid square is not typically required.
   
   - **Choice D: Send the call sign of the DX station three times, the words “this is,” then your call sign three times**
     - **Reasoning**: This method is overly verbose and can contribute to frequency congestion. Repeating the DX station's call sign and your own multiple times is inefficient and can slow down the process of making contacts in a busy environment.

In summary, the goal during a contest or pileup is to make contacts quickly and efficiently. Sending your full call sign once or twice achieves this by providing clear and complete identification without unnecessary repetition or information.