What must an amateur operator do when making on-air transmissions to test equipment or antennas?

When an amateur operator is making on-air transmissions to test equipment or antennas, properly identifying the transmitting station is essential as it ensures compliance with Federal Communications Commission (FCC) regulations. The requirement to identify oneself promotes accountability and transparency in amateur radio operations. It allows other operators and listening stations to know who is transmitting, fostering a responsible communication environment.

This identification must include the operator's call sign, which helps maintain proper communication protocols and avoids any confusion about the source of the transmission. It also plays a role in ensuring that the transmission does not interfere with others who may be using the same frequencies.

While stating the purpose of the test during the test procedure provides additional context, it is not a mandated requirement. Other options related to time restrictions or notifying the FCC pertain to different regulations and are not specifically required for making equipment or antenna tests as described.