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RF Exposure Evaluation for Amateur Radio Operators

Overview. This presentation is meant to be a brief introduction to RF exposure (RFE) rules promulgated by the FCC in1998 and RFE evaluation as it applies to amateur stations.For a comprehensive treatment of the FCC rules and evaluation techniques, see

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RF Exposure Evaluation for Amateur Radio Operators

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    1. RF Exposure Evaluation for Amateur Radio Operators Marc C. Tarplee, Ph.D. Technical Coordinator, SC Section

    2. Overview This presentation is meant to be a brief introduction to RF exposure (RFE) rules promulgated by the FCC in1998 and RFE evaluation as it applies to amateur stations. For a comprehensive treatment of the FCC rules and evaluation techniques, see RF Exposure and You, by Ed Hare, W1RFI. The book is available from ARRL for $15.

    3. A Brief Review of the FCC RF Exposure Rules

    4. The FCCs RF Exposure Rules On 1 January 1998, new FCC rules regarding RF Exposure (RFE) went into effect. RFE rules were not new the first FCC rules for RFE date back to 1985. The new rules no longer exempted amateurs from MPE limits. The rules set new limits on the maximum permissible exposure (MPE) allowed from radio transmitters.

    5. Major Points of the New Rules Set RF exposure limits that are consistent with the manner in which the human body absorbs RF. Require stations regulated by the FCC to meet the guidelines or file an environmental assessment. Permit amateurs to perform their own evaluation of their station. Provide categorical exemptions from RFE evaluation for stations whose power, frequency, duty cycle, etc. are such that compliance may be assumed.

    6. RF Environments The FCC rules define two classes of RF environments: Controlled: an environment in which people are aware of their RF exposure and are able to take action to reduce their exposure if necessary. Exposure in this environment is averaged over a 6 minute period. Uncontrolled: an environment accessible by the general public, who may not be aware of their RF exposure. Exposure in this environment is averaged over a 30 minute period.

    7. RF Environments Typically, the controlled environment is an amateurs residence and yard. The uncontrolled environment is everything else

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