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T0C09

SAFETY · RF hazards: radiation exposure, proximity to antennas, recognized safe power levels, radiation types, duty cycle

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How can you make sure your station stays in compliance with RF safety regulations?

  1. ABy informing the FCC of any changes made in your station
  2. BBy re-evaluating the station whenever an item in the transmitter or antenna system is changed
  3. CBy making sure your antennas have low SWR
  4. DBy using only Underwriter Laboratories approved transmitting equipment
Why FCC rules (97.13(c)) require you to evaluate your station for RF exposure, and that evaluation only describes the station as it existed when you did it. Change the power, mode, duty cycle, antenna type, antenna height or its location, and the exposure levels around the station change too, so a new evaluation is needed. Keeping the evaluation current with the station is what keeps you in compliance.
Watch out Low SWR is an efficiency and equipment-protection matter and says nothing about how much RF energy reaches people; a perfectly matched antenna can still overexpose a neighbor. The FCC does not require you to file station changes or to use UL-listed transmitters.
Change the rig, the antenna, or the power? Re-run the exposure evaluation. The station changes, the paperwork changes.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of T0C

  1. T0C01 What type of radiation are radio signals?
  2. T0C02 Which of the following bands has the lowest maximum permissible exposure for RF safety?
  3. T0C03 How does the allowable power density for RF safety change if duty cycle changes from 100 percent to 50 percen…
  4. T0C04 What factors affect the RF exposure of people near an amateur station antenna?
  5. T0C05 Why do exposure limits vary with frequency?
  6. T0C06 Which of the following is an acceptable method to determine whether your station complies with FCC RF exposur…
  7. T0C07 What hazard is created by touching an antenna during a transmission?
  8. T0C08 Which of the following actions can reduce exposure to RF radiation?
  9. T0C09 How can you make sure your station stays in compliance with RF safety regulations?
  10. T0C10 Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
  11. T0C11 What is the definition of duty cycle during the averaging time for RF exposure?
  12. T0C12 How does RF radiation differ from ionizing radiation (radioactivity)?
  13. T0C13 Who is responsible for ensuring that no person is exposed to RF energy above the FCC exposure limits?
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