MPE Calculation

FCC ID: N89-WR114

RF Exposure Info

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FCCID_344052

Ecom Sertech Corp. FCC ID ：N89-WR114 Rm. 258, Bldg. 17, NO.195, Sec. 4 Chung Hsing Rd.,Chu - Tung Chen, Hsinchu, Taiwan 310, R.O.C Report No.：ER03-05-032FRF TEL:886 - 3 - 5918012 FAX : 886 - 3- 5825720 Page 1 of 2 RF EXPOSURE EVALUATION 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 (MHz) Strength (V/m) Strength (A/m) (mW/cm2) (A) Limits for Occupational / Control Exposures 300-1,500 -- -- F/300 6 1,500-100,000 -- -- 5 6 (B) Limits for General Population / Uncontrol Exposures 300-1,500 -- -- F/1500 6 1,500-100,000 -- -- 1 30 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. EUT Operating Condition A software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually.

Ecom Sertech Corp. FCC ID ：N89-WR114 Rm. 258, Bldg. 17, NO.195, Sec. 4 Chung Hsing Rd.,Chu - Tung Chen, Hsinchu, Taiwan 310, R.O.C Report No.：ER03-05-032FRF TEL:886 - 3 - 5918012 FAX : 886 - 3- 5825720 Page 2 of 2 Test Result of Rf Exposure Evaluation Test Item ： RF Exposure Evaluation Data Test Mode ： Normal Operation Antenna Gain Antenna Gain：The maximum Gain measured in fully anechoic chamber is 2dBi linear scale. Output Power Into Antenna & Rf Exposure Evaluation Distance Power density in Output Power to Channel Frequency mW/cm2 at Friis Channel Antenna LIMITS (MHz) formula when (dBm) r=20cm(mW/cm2) CH1 2412.00 15.18 0.028822 1 CH6 2437.00 15.17 0.031098 1 CH11 2462.00 15.06 0.030742 1 The power density Pd (4th column) at a distance of 20cm calculated from the Friis transmission formula is far belowthe limit of 1 mW/cm2 . So, RF exposure limit warning or SAR test are not required.


Document Created: 2003-07-30 08:51:33
Document Modified: 2003-07-30 08:51:33
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