*Question E8D05:
What is the most common method of reducing key clicks?*  

*Correct Answer is  A: Increase keying waveform rise and fall times*  

### AI Response: (may contain errors)  

To understand how to reduce key clicks in an amateur radio setup, let's analyze the correct answer and the other options.

### Correct Answer: A - Increase keying waveform rise and fall times

- **Explanation**: Key clicks are unwanted signals that occur when the keying waveform changes too quickly. By increasing the rise and fall times of the keying waveform, you allow the signal to transition more smoothly. This reduces the abrupt changes in amplitude that cause key clicks, leading to a cleaner signal.

### Why the Other Choices are Incorrect:

- **B: Insert low-pass filters at the transmitter output**  
  - **Explanation**: While low-pass filters can help reduce high-frequency noise, they do not specifically address the issue of key clicks caused by rapid changes in the keying waveform. They may filter out some unwanted frequencies but won't eliminate the key clicks themselves.

- **C: Reduce keying waveform rise and fall times**  
  - **Explanation**: This option is the opposite of what is needed. Reducing the rise and fall times would make the transitions sharper, which can actually increase the occurrence of key clicks due to the sudden changes in the signal.

- **D: Insert high-pass filters at the transmitter output**  
  - **Explanation**: High-pass filters are designed to allow high-frequency signals to pass while attenuating lower frequencies. Similar to low-pass filters, they do not address the keying waveform's rise and fall times and would not effectively reduce key clicks.

### Summary

To effectively reduce key clicks, you should focus on smoothing the keying waveform by increasing the rise and fall times. This approach minimizes abrupt changes in the signal, leading to a cleaner transmission. 

Remember, the key to reducing key clicks is to ensure that the transitions in your keying waveform are gradual rather than abrupt.