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G0A03

ELECTRICAL AND RF SAFETY · - RF safety principles, rules, and guidelines; routine station evaluation

G0A03§ 97.13(c)(1)G0A →

How can you determine that your station complies with FCC RF exposure regulations?

  1. ABy calculation based on FCC OET Bulletin 65
  2. BBy calculation based on computer modeling
  3. CBy measurement of field strength using calibrated equipment
  4. DAll these choices are correct
Why Section 97.13(c)(1) requires that a station be evaluated for compliance with the RF exposure limits, but it does not dictate a single method. The FCC accepts calculations using the formulas and tables in OET Bulletin 65 (and its amateur supplement B), calculations from antenna modeling software that predicts field strength at nearby locations, and direct measurement with properly calibrated field strength or power density instruments. Any of these, done honestly, satisfies the routine station evaluation requirement, and you keep the results on file for yourself rather than filing them with the FCC.
Watch out Each single-method choice is a legitimate technique, so picking just one ignores the fact that the rule permits all of them; calibrated measurement equipment in particular is accurate but expensive and is not required.
Calculate, model, or measure: the FCC takes any of the three. OET Bulletin 65 is the amateur's go-to reference.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
47 CFR 97.13(c)(1) Restrictions on station location.

(a) Before placing an amateur station on land of environmental importance or that is significant in American history, architecture or culture, the licensee may be required to take certain actions prescribed by §§ 1.1305-1.1319 of this chapter.

(b) A station within 1600 m (1 mile) of an FCC monitoring facility must protect that facility from harmful interference. Failure to do so could result in imposition of operating restrictions upon the amateur station pursuant to § 97.121. Geographical coordinates of the facilities that require protection are listed in § 0.121(c) of this chapter.

(c) Before causing or allowing an amateur station to transmit from any place where the operation of the station could cause human exposure to RF electromagnetic field levels in excess of those allowed under § 1.1310 of this chapter, the licensee is required to take certain actions.

(1) The licensee shall ensure compliance with the Commission's radio frequency exposure requirements in §§ 1.1307(b), 2.1091, and 2.1093 of this chapter, where applicable. In lieu of evaluation with the general population/uncontrolled exposure limits, amateur licensees may evaluate their operation with respect to members of his or her immediate household using the occupational/controlled exposure limits in § 1.1310, provided appropriate training and information has been accessed by the amateur licensee and members of his/her household. RF exposure of other nearby persons who are not members of the amateur licensee's household must be evaluated with respect to the general population/uncontrolled exposure limits. Appropriate methodologies and guidance for evaluating amateur radio service operation is described in the Office of Engineering and Technology (OET) Bulletin 65, Supplement B.

(2) If the routine environmental evaluation indicates that the RF electromagnetic fields could exceed the limits contained in § 1.1310 of this chapter in accessible areas, the licensee must take action to prevent human exposure to such RF electromagnetic fields. Further information on evaluating compliance with these limits can be found in the FCC's OET Bulletin Number 65, “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields.”

eCFR text as of 1 Sep 2026 · read on ecfr.gov
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The rest of G0A

  1. G0A01 What is one way that RF energy can affect human body tissue?
  2. G0A02 Which of the following is used to determine RF exposure from a transmitted signal?
  3. G0A03 How can you determine that your station complies with FCC RF exposure regulations?
  4. G0A04 What does "time averaging" mean when evaluating RF radiation exposure?
  5. G0A05 What must you do if an evaluation of your station shows that the RF energy radiated by your station exceeds p…
  6. G0A06 What must you do if your station fails to meet the FCC RF exposure exemption criteria?
  7. G0A07 What is the effect of modulation duty cycle on RF exposure?
  8. G0A08 Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?
  9. G0A09 What type of instrument can be used to accurately measure an RF field strength?
  10. G0A10 What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF …
  11. G0A11 What precaution should be taken if you install an indoor transmitting antenna?
  12. G0A12 What stations are subject to the FCC rules on RF exposure?
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