47 CFR 18.305

§ 18.305 Field strength limits.

United States · 47 CFR — Telecommunication · Status: effective

Cite this

Citation: 47 CFR 18.305, § 18.305 Field strength limits, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/234563
Permanent ID: ys:prov:234563@1
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Full text

(a) ISM equipment operating on a frequency specified in § 18.301 is permitted unlimited radiated energy in the band specified for that frequency. (b) The field strength levels of emissions which lie outside the bands specified in § 18.301, unless otherwise indicated, shall not exceed the following: (c) The field strength limits for RF lighting devices shall be the following: 1. The tighter limit shall apply at the boundary between two frequency ranges. 2. Testing for compliance with these limits may be made at closer distances, provided a sufficient number of measurements are taken to plot the radiation pattern, to determine the major lobes of radiation, and to determine the expected field strength level at 30, 300, or 1600 meters. Alternatively, if measurements are made at only one closer fixed distance, then the permissible field strength limits shall be adjusted using 1/d as an attenuation factor.

Legislative history

This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.