RF Exposure

FCC ID: I4L-MS3871

RF Exposure Info

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FCCID_1276719

Report No. 103090R-RFUSP29V01 RF Exposure Evaluation declaration Product Name WLAN 802.11b/g/n 1T1R+BT2.1 EDR Combo Slim Module Model No. MS-3871 FCC ID I4L-MS3871 Applicant MICRO-STAR INT'L Co., LTD. Address No. 69, Li-De St., Jung-He City, Taipei Hsien, Taiwan, R.O.C. Date of Receipt March 04, 2010 Date of Declaration April 09, 2010 Report No. 103090R-RFUSP29V01 The declaration results relate only to the samples calculated. The declaration shall not be reproduced except in full without the written approval of QuieTek Corporation. This report must not be used to claim product endorsement by NVLAP any agency of the U.S. Government Page: 1 of 4

Report No. 103090R-RFUSP29V01 1. RF Exposure Evaluation 1.1. Limits According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Range Electric Field Magnetic Field Power Density Average Time 2 (MHz) Strength (V/m) Strength (A/m) (mW/cm ) (Minutes) (A) Limits for Occupational/ Control Exposures 300-1500 -- -- F/300 6 1500-100,000 -- -- 5 6 (B) Limits for General Population/ Uncontrolled Exposures 300-1500 -- -- F/1500 6 1500-100,000 -- -- 1 30 F= Frequency in MHz Friis Formula Friis transmission formula: Pd = (Pout*G)/(4*pi*r2) Where Pd = power density in mW/cm2 Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm2 . If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. 1.2. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. The temperature and related humidity: 18℃and 78％ RH. Page: 2 of 4

Report No. 103090R-RFUSP29V01 1.3. Test Result of RF Exposure Evaluation Product : WLAN 802.11b/g/n 1T1R+BT2.1 EDR Combo Slim Module Test Item : RF Exposure Evaluation Test Site : No.3 OATS Antenna Gain Antenna Gain: The maximum Gain measured in fully anechoic chamber is 1.93 dBi in logarithm scale. 802.11b (1Mbps) Output Power Into Antenna & RF Exposure Evaluation Distance (1.93dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 01 2412.00 43.7522 0.013575 06 2437.00 44.8745 0.013923 11 2462.00 42.3643 0.013144 802.11g (6Mbps) Output Power Into Antenna & RF Exposure Evaluation Distance (1.93dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 01 2412.00 151.3561 0.046960 06 2437.00 152.4053 0.047286 11 2462.00 138.3566 0.042927 802.11n-20MHz (7.2Mbps) Output Power Into Antenna & RF Exposure Evaluation Distance (1.93dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 01 2412.00 126.7652 0.039331 06 2437.00 129.7179 0.040247 11 2462.00 118.5769 0.036790 Page: 3 of 4

Report No. 103090R-RFUSP29V01 802.11n-40MHz (15Mbps) Output Power Into Antenna & RF Exposure Evaluation Distance (1.93dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 01 2422.00 117.2195 0.036369 04 2437.00 128.8250 0.039970 07 2452.00 123.3105 0.038259 The distance r (4th column) calculated from the Fries transmission formula is far shorter than 20 cm separation requirement. Page: 4 of 4


Document Created: 2010-05-03 16:43:09
Document Modified: 2010-05-03 16:43:09
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