ARRL Technician Practice Exam

Which of these factors could lead to increased RF exposure to the operator?

1. Using lower frequency bands

2. Having poor antenna placement

3. Reducing transmission power

4. Implementing automated controls

The correct answer is: Having poor antenna placement

Having poor antenna placement can lead to increased RF exposure for the operator because the positioning of the antenna relative to the operator plays a critical role in how much RF radiation is received. When an antenna is poorly positioned, it may direct RF energy towards the operator rather than away from them, causing an unintended increase in exposure to electromagnetic fields. For instance, if an antenna is installed too close to the operating position or is directed in a way that focuses the RF energy toward the operator, it becomes more likely that the operator will absorb a greater amount of RF radiation. Proper antenna placement is essential for mitigating exposure and ensuring that the energy transmitted is directed away from the operator's location whenever possible. In contrast, using lower frequency bands usually decreases RF exposure because lower frequencies tend to radiate less effectively for a given power level, and the wavelengths involved often require larger antennas that can influence the patterns of radiation. Reducing transmission power significantly decreases the amount of radiated RF energy, thus lowering exposure levels. Implementing automated controls typically serves to streamline operations without increasing risk exposure directly, and could even facilitate better management of RF emissions.