ARRL Technician Practice Exam

Which action might amateur operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?

1. Adjust the frequency of transmission

2. Relocate antennas

3. Increase power output

4. Use a different mode of transmission

The correct answer is: Relocate antennas

Relocating antennas is an effective action that amateur operators can take to prevent exposure to radio frequency (RF) radiation in excess of the limits established by the Federal Communications Commission (FCC). One of the main considerations for RF safety is the placement of antennas in relation to areas where people may be present, as the intensity of RF radiation decreases with distance from the antenna. By relocating antennas further away from common areas or individuals, operators can significantly reduce exposure levels. This practice ensures that the generated RF fields comply with the safety limits set by the FCC, thereby protecting operators and others from potential health risks associated with prolonged RF exposure. The other actions listed would not effectively mitigate RF radiation exposure risks. Adjusting the frequency of transmission may not have a direct impact on exposure levels, as the radiation pattern and levels depend more on the physical placement and power of the antenna. Increasing power output would likely increase the RF radiation and potential exposure, which is counterproductive to the goal of safety. Using a different mode of transmission could change the characteristics of the signal, but it does not necessarily address the issue of RF exposure in regard to location and distance from individuals. Therefore, relocating antennas is the most effective strategy for adhering to RF safety guidelines.