RF Exposure Info

FCC ID: U2M-OC36600802

RF Exposure Info

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FCCID_1034732

FCC ID: U2M-OC36600802 RF EXPOSURE REPORT REPORT NO.: SA971103L12 MODEL NO.: ZF2741 ACCORDING: FCC Guidelines for Human Exposure IEEE C95.1 Applicant’s Company Senao Networks, Inc. Applicant Address 3F, No. 529, Chung Cheng Rd., Hsintien, Taipei, Taiwan FCC ID U2M-OC36600802 Manufacturer’s Company Senao Networks, Inc. Manufacturer Address 3F, No. 529, Chung Cheng Rd., Hsintien, Taipei, Taiwan ISSUED BY : Advance Data Technology Corporation LAB ADDRESS : No. 47, 14th Ling, Chia Pau Tsuen, Lin Kou Hsiang, Taipei Hsien 244, Taiwan, R.O.C. TEST LOCATION : No. 19, Hwa Ya 2nd Rd, Wen Hwa Tsuen, Kwei Shan Hsiang, Taoyuan Hsien 333, Taiwan, R.O.C. Report No: SA971103L12 1

FCC ID: U2M-OC36600802 RF EXPOSURE MEASUREMENT (MOBILE DEVICE) 1. INTRODUCTION In this document, we try to prove the safety of radiation harmfulness to the human body for our product. The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The Gain of the antenna used in this product is measured in a Fully Anechoic Chamber (FAC) calibrated for antenna measurement in ADT, and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis transmission formula is a far field assumption, the calculated result of that is an over-prediction for near field power density. We will take that as the worst case to specify the safety range. 2. RF EXPOSURE LIMIT According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of human exposure to radio-frequency (RF) radiation as specified in 1.1307(b) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) FREQUENCY ELECTRIC FIELD MAGNETIC FIELD POWER DENSITY AVERAGE TIME 2 RANGE (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 EXPOSURE 300-1500 … … F/1500 30 1500-100,000 … … 1.0 30 F = Frequency in MHz Report No: SA971103L12 2

FCC ID: U2M-OC36600802 3. 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 If we know the maximum Gain of the antenna and the total power input to the antenna, through the calculation, we will know the MPE value at distance r. Ref.: David K. Cheng, Field and Wave Electromagnetics, Second Edition, Page 640, Eq. (11-133). 4. EUT OPERATING CONDITION The software provided by Manufacturer enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. 5. CLASSIFICATION The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. Warning statement to the user for keeping at least 20cm or more separation distance with the antenna should be included in users manual. So, this device is classified as Mobile Device. Report No: SA971103L12 3

FCC ID: U2M-OC36600802 6. TEST RESULTS 6.1 ANTENNA GAIN The maximum Gain measured in Fully Anechoic Chamber are 5dBi or 3.162278(numeric) and 9dBi or 7.943282(numeric). 6.2 OUTPUT POWER INTO ANTENNA & RF EXPOSURE VALUE AT DISTANCE 20cm: Internal antenna with 5dBi gain: 802.11b DSSS MODULATION Limit of CHANNEL PEAK POWER PEAK POWER Power Density Power CHANNEL FREQUENCY OUTPUT (mW) OUTPUT (dBm) (mW/cm2) Density (MHz) (mW/cm2) 1 2412 202.768 23.07 0.064 1.000 6 2437 504.661 27.03 0.159 1.000 11 2462 161.808 22.09 0.051 1.000 802.11g OFDM MODULATION Limit of CHANNEL PEAK POWER PEAK POWER Power Density Power CHANNEL FREQUENCY OUTPUT (mW) OUTPUT (dBm) (mW/cm2) Density (MHz) (mW/cm2) 1 2412 402.717 26.05 0.127 1.000 6 2437 405.509 26.08 0.128 1.000 11 2462 401.791 26.04 0.127 1.000 External antenna with 9dBi gain: 802.11b DSSS MODULATION Limit of CHANNEL PEAK POWER PEAK POWER Power Density Power CHANNEL FREQUENCY 2 OUTPUT (mW) OUTPUT (dBm) (mW/cm ) Density (MHz) (mW/cm2) 1 2412 101.158 20.05 0.160 1.000 6 2437 201.372 23.04 0.318 1.000 11 2462 90.782 19.58 0.143 1.000 802.11g OFDM MODULATION Limit of CHANNEL PEAK POWER PEAK POWER Power Density Power CHANNEL FREQUENCY OUTPUT (mW) OUTPUT (dBm) (mW/cm2) Density (MHz) (mW/cm2) 1 2412 360.579 25.57 0.570 1.000 6 2437 357.273 25.53 0.565 1.000 11 2462 255.859 24.08 0.404 1.000 Report No: SA971103L12 4


Document Created: 2008-11-21 18:22:59
Document Modified: 2008-11-21 18:22:59
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