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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