Question
What does “time averaging” mean when evaluating RF radiation exposure?
Answer Options
- A) The average amount of power developed by the transmitter over a specific 24-hour period
- B) The average time it takes RF radiation to have any long-term effect on the body
- C) The total time of the exposure
- D) The total RF exposure averaged over a certain period
Correct Answer: D
Explanation
RF exposure limits established by the FCC are based on the total amount of energy absorbed by a person over a specified time interval, not just the instantaneous peak exposure. This concept is called time averaging.
Time averaging means that the total RF exposure is averaged over a certain period. This is important because it allows higher power levels for short periods (like a voice peak) or for modes with a low duty cycle (like SSB or CW), provided the average power over the averaging period remains below the MPE limit.
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