Question T0C08
From subelement T0 - T0C
Which of the following actions can reduce exposure to RF radiation?
Why is this correct?
Relocating antennas is the most effective way to reduce RF exposure because RF energy decreases dramatically with distance following the inverse square law—doubling distance reduces exposure to one-quarter. Choice B (relocate transmitter) doesn't help since the antenna still radiates from the same location. Choice C (increase duty cycle) actually increases exposure by transmitting more frequently, making it dangerous rather than protective.
Memory tip
Remember the pattern: RF exposure problems are solved by either reducing the source (power/time) or increasing separation (distance/shielding). When evaluating RF safety solutions, ask whether the action puts more space between people and the radiating antenna—that's usually the right answer.
Learn more
Practical station planning requires understanding that antennas create near-field and far-field radiation zones. Within the near field (typically within one wavelength), exposure levels can be unpredictable and potentially high. Moving antennas higher or farther from occupied areas ensures people remain in the safer far-field region where exposure follows predictable patterns and is generally lower per Part 97.13 requirements.
Think about it
Why do you think relocating the transmitter itself doesn't reduce RF exposure to people near the antenna, even though you're moving the source of the RF energy?