18_VA-VD002 RFExp r2

FCC ID: 2AFDGVA-VD002A

RF Exposure Info

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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)

FCC ID: 2AFDGVA-VD002A
EUT Specification
EUT                            DASH CAM
Frequency band (Operating)        WLAN: 2.412GHz ~ 2.462GHz
                                  WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz
                                  WLAN: 5.745GHz ~ 5825GHz
                                  Others: 2.402GHz~2.480GHz (BT4.1)
Device category                   Portable (<20cm separation)
                                  Mobile (>20cm separation)
                                  Others ___
Exposure classification           Occupational/Controlled exposure (S = 5mW/cm2)
                                  General Population/Uncontrolled exposure (S=1mW/cm2)
Antenna diversity                 Single antenna
                                  Multiple antennas
                                  Tx diversity
                                  Rx diversity
                                  Tx/Rx diversity
Max. output power              17.43 dBm (0.0553W) for Wifi
                               -0.824 dBm (0.00083W) for BT
Antenna gain (Max)             3 dBi
Evaluation applied                MPE Evaluation
                                  SAR Evaluation

Limits for Maximum Permissible Exposure(MPE)

  Frequency     Electric Field Magnetic Field         Power               Average
                                                               2
 Range(MHz)    Strength(V/m) Strength(A/m) Density(mW/cm )                 Time
                (A) Limits for Occupational/Control Exposures
  300-1500            --              --              F/300                  6
 1500-100000          --              --                5                    6
           (B) Limits for General Population/Uncontrol Exposures
  300-1500            --              --             F/1500                  6
 1500-100000          --              --                1                    30


    Friis transmission formula: Pd=(Pout*G)\(4*pi*R2)

  Where
                                2
  Pd= Power density in mW/cm
  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 the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and
  total power input to the antenna, through the calculation, we will know the distance
  where the MPE limit is reached.

  Measurement Result

            Channel     Measured    Tune up      Max. Tune    Antenna   Power density    Power density
Operating
            Frequency    Power      tolerance     up Power     Gain       at 20cm           Limits
 Mode                                                                            2                2
             (MHz)       (dBm)       (dBm)         (dBm)       (dBi)     (mW/ cm )        (mW/cm )
              2412       17.43      17.43±1        18.43         3         0.0277             1
802.11b       2437       15.92      15.92±1        16.92         3         0.0195             1
              2462       15.58      15.58±1        16.58         3         0.0181             1
              2412       16.47      16.47±1        17.47         3         0.0222             1
802.11g       2437       16.89      16.89±1        17.89         3         0.0244             1
              2462       16.41      16.41±1        17.41         3         0.0219             1
              2412       16.66      16.66±1        17.66         3         0.0232             1
802.11n
              2437       16.77      16.77±1        17.77         3         0.0238             1
 (HT20)
              2462       16.29      16.29±1        17.29         3         0.0213             1
              2402       -2.484     -2.484±1       -1.484        3         0.0003             1
 BT 4.1       2440       -2.314     -2.314±1       -1.314        3         0.0003             1
              2480       -0.824     -0.824±1       0.176         3         0.0004             1



Document Created: 0400-06-03 00:00:00
Document Modified: 0400-06-03 00:00:00

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