MPE Calculation

FCC ID: SWX-SR4C

RF Exposure Info

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FCCID_679714

Ubiquiti Networks Electromagnetic Compatibility SR4C CFR Title 47, Part 90, Subpart Y Electromagnetic Compatibility RF Exposure Requirements §1.1307 RF Exposure Requirements RF Exposure Requirements: §90.1217, §1.1307(b)(1) and §1.1307(b)(2): Systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess of the Commission’s guidelines. RF Radiation Exposure Limit: §1.1310: As specified in this section, the Maximum Permissible Exposure (MPE) Limit shall be used to evaluate the environmental impact of human exposure to radiofrequency (RF) radiation as specified in Sec. 1.1307(b), except in the case of portable devices which shall be evaluated according to the provisions of Sec. 2.1093 of this chapter. MPE Limit Calculation: EUT’s operating frequencies @ 4940-4990 MHz; highest conducted power = 32.6dBm (peak) therefore, Limit for Uncontrolled exposure: 1 mW/cm2 or 10 W/m2 EUT maximum antenna gain = 26 dBi. EUT Minimum antenna gain = 9 dBi. Equation from page 18 of OET 65, Edition 97-01 EUT with 26dBi Antenna S = PG / 4πR2 or R = √PG / 4πS where, S = Power Density (1 mW/cm2) P = Power Input to antenna (1819.7mW) G = Antenna Gain (398.1 numeric) R = (1819.7*398.1/4*3.14) 1/2 = (724422.9/12.56) 1/2 = 240.1cm _in order to comply with 1 mW/cm2 EUT with 9dBi Antenna S = PG / 4πR2 or R = √PG / 4πS where, S = Power Density (1 mW/cm2) P = Power Input to antenna (1819.7mW) G = Antenna Gain (7.94 numeric) R = (1819.7*7.94/4*3.14) 1/2 = (14448.4/12.56) 1/2 = 33.9cm _in order to comply with 1 mW/cm2 MET Report: EMCS19815-FCC90 © 2006, MET Laboratories, Inc. Page 53 of 63 DOC-EMC700 7/9/04


Document Created: 2006-06-30 12:06:34
Document Modified: 2006-06-30 12:06:34
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