MPE Estimate

FCC ID: LDK102051

RF Exposure Info

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FCCID_375459

REPORT NO: 03U2286-2 DATE: OCTOBER 30, 2003 EUT: 802.11a/g PCI adapter FCC ID: LDK102051 7.3. MAXIMUM PERMISSIBLE EXPOSURE LIMITS §15.247 (b) (5) 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. See §1.1307(b)(1) of this chapter. CALCULATIONS Given E = √ (30 * P * G) / d and S = E ^ 2 / 3770 where E = Field Strength in Volts / meter P = Power in Watts G = Numeric antenna gain d = distance in meters S = Power Density in milliwatts / square centimeter Combining equations and rearranging the terms to express the distance as a function of the remaining variables yields: d = √ ((30 * P * G) / (3770 * S)) Changing to units of mW and cm, using: P (mW) = P (W) / 1000 and d (cm) =100 * d (m) yields d = 100 * √ ((30 * (P / 1000) * G) / (3770 * S)) d = 0.282 * √ (P * G / S) where d = distance in cm P = Power in mW G = Numeric antenna gain S = Power Density in mW / cm^2 Page 21 of 59 COMPLIANCE CERTIFICATION SERVICES DOCUMENT NO: CCSUP4031A 561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA TEL: (408) 463-0885 FAX: (408) 463-0888 This report shall not be reproduced except in full, without the written approval of CCS. This document may be altered or revised by Compliance Certification Services personnel only, and shall be noted in the revision section of the document.

REPORT NO: 03U2286-2 DATE: OCTOBER 30, 2003 EUT: 802.11a/g PCI adapter FCC ID: LDK102051 Substituting the logarithmic form of power and gain using: P (mW) = 10 ^ (P (dBm) / 10) and G (numeric) = 10 ^ (G (dBi) / 10) yields d = 0.282 * 10 ^ ((P + G) / 20) / √ S Equation (1) where d = MPE distance in cm P = Power in dBm G = Antenna Gain in dBi S = Power Density Limit in mW / cm^2 Equation (1) and the measured peak power is used to calculate the MPE distance. LIMITS S = 1.0 mW / cm^2 from 1.1310 Table 1 RESULTS No non-compliance noted: Power Density Limit Output Power Antenna Gain MPE Distance (mW/cm^2) (dBm) (dBi) (cm) 1.0 15.05 0.93 1.78 NOTE: For mobile or fixed location transmitters, the minimum separation distance is 20 cm, even if calculations indicate that the MPE distance would be less. Page 22 of 59 COMPLIANCE CERTIFICATION SERVICES DOCUMENT NO: CCSUP4031A 561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA TEL: (408) 463-0885 FAX: (408) 463-0888 This report shall not be reproduced except in full, without the written approval of CCS. This document may be altered or revised by Compliance Certification Services personnel only, and shall be noted in the revision section of the document.


Document Created: 2003-11-21 16:01:11
Document Modified: 2003-11-21 16:01:11
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