RF Exposure Info

FCC ID: PBLWL531M

RF Exposure Info

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FCCID_475937

                Ecom Sertech Corp.
                                                                   FCC ID :PBLWL531M
                Rm. 258, Bldg. 17, NO.195, Sec. 4 Chung Hsing
                Rd.,Chu
                   - Tung Chen, Hsinchu, Taiwan 310, R.O.C
                                                                   Report No.:ER04-06-031FRF
                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 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 :PBLWL531M
                      Rm. 258, Bldg. 17, NO.195, Sec. 4 Chung Hsing
                      Rd.,Chu
                         - Tung Chen, Hsinchu, Taiwan 310, R.O.C
                                                                         Report No.:ER04-06-031FRF
                      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 1.5dBi
                                   linear scale.


          Output Power into Antenna & RF Exposure Evaluation Distance


                   Channel   Output Average                            Power Density
                                                          Antenna                            LIMITS
  Channel         Frequency Power to Antenna                              at 20cm
                                                           Gain                             (mW/cm2)
                    (MHz)        (dBm)                                   (mW/cm2)
    CH1            2412.00               14.52                1.5          0.005633              1
    CH6            2437.00               13.84                1.5          0.004816              1
    CH11           2462.00               13.03                1.5          0.003997              1
Note :
         1. For 802.11b mode (11Mbps).
         2. The power density Pd (4th column) at a distance of 20cm calculated from the fries transmission
            formula is far below the limit of 1 mW/cm2 . The EUT is classified as mobile product. So, RF
            exposure limit warning or SAR test are not required.




                   Channel   Output Average                            Power Density
                                                          Antenna                            LIMITS
  Channel         Frequency Power to Antenna                              at 20cm
                                                           Gain                             (mW/cm2)
                    (MHz)        (dBm)                                   (mW/cm2)
    CH1            2412.00               11.41                1.5          0.002753              1
    CH6            2437.00               10.89                1.5          0.002442              1
    CH11           2462.00               10.09                1.5          0.002031              1
Note :
         1. For 802.11g mode (6Mbps).
         2. The power density Pd (4th column) at a distance of 20cm calculated from the fries transmission
            formula is far below the limit of 1 mW/cm2 . The EUT is classified as mobile product. So, RF
            exposure limit warning or SAR test are not required.



Document Created: 2004-08-31 11:39:56
Document Modified: 2004-08-31 11:39:56

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