MPE Calculation

FCC ID: SWX-SRX

RF Exposure Info

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FCCID_876508

Electromagnetic Compatibility Ubiquiti Networks Intentional Radiators SRX CFR Title 47, Part 15, Subpart B & C; ICES-003 & RSS-210 Electromagnetic Compatibility Criteria for Intentional Radiators § 15.247(b) Peak Power Output and RF Exposure RF Exposure Requirements: §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 @ 2400-2483.5 MHz; highest conducted power = 25.1dBm (peak) therefore, Limit for Uncontrolled exposure: 1 mW/cm2 or 10 W/m2 EUT maximum antenna gain = 5.5 dBi. Equation from page 18 of OET 65, Edition 97-01 S = PG / 4πR2 or R = √PG / 4πS where, S = Power Density (1 mW/cm2) P = Power Input to antenna (323.5mW) G = Antenna Gain (3.54 numeric) S = (323.5*3.54/4*3.14*202 )= (1145.19 /5024) = 0.22 mW/cm2 MPE Limit Calculation: EUT’s operating frequencies @ 5725 - 5850 MHz; highest conducted power = 19.5dBm (peak) therefore, Limit for Uncontrolled exposure: 1 mW/cm2 or 10 W/m2 EUT maximum antenna gain = 1.5 dBi. Equation from page 18 of OET 65, Edition 97-01 S = PG / 4πR2 or R = √PG / 4πS where, S = Power Density (1 mW/cm2) P = Power Input to antenna (89.12mW) G = Antenna Gain (1.41numeric) S = (89.12*1.41/4*3.14*202 )= (125.65 /5024) = 0.025 mW/cm2 MET Report: EMCS80375B-FCC247 © 2007, MET Laboratories, Inc.


Document Created: 2007-12-03 13:38:45
Document Modified: 2007-12-03 13:38:45
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