What is one precaution to take before making test signals?

Before making test signals, it is important to call another aircraft or ground station on an appropriate frequency. This approach ensures that your communication equipment is functioning properly and that you are able to transmit messages clearly. It also allows other users on the frequency to be aware of your testing, thereby minimizing any risk of interference or confusion during your signal tests.

Making contact with another station confirms that your equipment is operational and provides real-time feedback about your signal strength and clarity. This practice is crucial in aviation to maintain effective communication, which is vital for safety and coordination in airspace.

While ensuring all channels are clear, notifying nearby stations, and obtaining permission from the control tower are prudent precautions in different contexts, they do not directly serve the function of verifying that your equipment is working as intended during test signals. Calling a specific station allows for a targeted test and is essential for operational checks.