ARRL Technician Practice Exam

What is the definition of duty cycle during the averaging time for RF exposure?

1. The maximum power output of a transmitter

2. The percentage of time that a transmitter is transmitting

3. The frequency range of the transmitted signal

4. The total number of transmissions made

The correct answer is: The percentage of time that a transmitter is transmitting

The definition of duty cycle during the averaging time for RF exposure refers to the percentage of time that a transmitter is actively transmitting compared to the total observation period. This concept is crucial in assessing exposure levels because it directly affects the average power density received over time. In the context of RF exposure, a transmitter that operates with a higher duty cycle will result in more extended periods of radiation, increasing the potential exposure to those in proximity. By understanding duty cycle, operators can better manage and mitigate RF exposure risks by ensuring that transmissions are performed at safe levels. The other terms listed do not accurately represent the concept of duty cycle. The maximum power output pertains to the strength or capacity of the transmitter, not the timing of transmissions. The frequency range relates to the specific bands over which the signal is transmitted, while the total number of transmissions made does not account for how long each transmission lasts or its implications for RF exposure.