*Question G2E04:
Which of the following is good practice when choosing a transmitting frequency to answer a station calling CQ using FT8?*  

*Correct Answer is  D: Find a clear frequency during the alternate time slot to the calling station*  

### AI Response: (may contain errors)  

When choosing a transmitting frequency to answer a station calling CQ using FT8, the best practice is to find a clear frequency during the alternate time slot to the calling station. Here's why:

### Correct Answer: 
**D: Find a clear frequency during the alternate time slot to the calling station.**

- **Reasoning**: FT8 operates in a structured time slot system where each transmission lasts for 15 seconds. When a station calls CQ, it transmits during a specific time slot. By choosing an alternate time slot, you avoid overlapping transmissions, which can lead to interference. This practice ensures that your response is heard clearly without disrupting the ongoing communication.

### Why the Other Choices are Incorrect:

- **A: Always call on the station’s frequency**  
  - **Reason**: Calling on the same frequency as the station that is calling CQ can cause interference. Since FT8 is a weak signal mode, overlapping signals can make it difficult for either station to complete their communication.

- **B: Call on any frequency in the waterfall except the station’s frequency**  
  - **Reason**: While avoiding the calling station's frequency is good, simply calling on any frequency in the waterfall does not guarantee that you are in a clear slot. You may still interfere with other ongoing communications.

- **C: Find a clear frequency during the same time slot as the calling station**  
  - **Reason**: This option is not advisable because it can lead to overlapping signals. If you transmit during the same time slot, your signal may interfere with the calling station's transmission, making it difficult for both stations to communicate effectively.

### Summary:
- **Best Practice**: Use an alternate time slot to avoid interference.
- **Key Point**: FT8 operates in 15-second time slots, so timing is crucial for effective communication.

By following these guidelines, you can ensure a smoother and more effective operation in FT8 communications.