MPE_Report

FCC ID: 2AFSH-CINEVOX-A

RF Exposure Info

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                                                                             FCC ID: 2AFSH-CINEVOX-A


RF Exposure Evaluation
Limits
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)
                        Electric field
Frequency range                            Magnetic field strength      Power density       Averaging time
                          strength                                                      2
      (MHz)                                             (A/m)             (mW/cm )             (minutes)
                           (V/m)
                              (A) Limits for Occupational/Controlled Exposures
     0.3–3.0                614                         1.63                *(100)                  6
                                                                                    2
      3.0–30               1842/f                       4.89/f             *(900/f )                6
     30–300                 61.4                        0.163                1.0                    6
    300–1500                                                                f/300                   6
  1500–100,000                                                                5                     6
                          (B) Limits for General Population/Uncontrolled Exposure
     0.3–1.34               614                         1.63                *(100)                  30
                                                                                    2
     1.34–30                824/f                       2.19/f             *(180/f )                30
     30–300                 27.5                        0.073                0.2                    30
    300–1500                                                                f/1500                  30
  1500–100,000                                                               1.0                    30
f = frequency in MHz
                                                    2
Friis transmission formula: Pd = (Pout*G)/(4*pi*r )


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

                                   2
Pd id the limit of MPE, 1 mW/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 distance r where the MPE limit is reached.
Test Procedure
Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest
channel individually.


Test Result of RF Exposure Evaluation


WiFi 2.4Gmode

                                Output power to        Power Density at           Limit
          Channel                                                      2                  2    Result
                                 antenna (mW)         R=20cm (mW/cm )          (mW/cm )

     Lowest (2412MHz)                78.70                  0.0157                1.0          PASS

     Middle (2437MHz)                65.16                  0.0130                1.0          PASS

     Highest (2462MHz)               64.12                  0.0128                1.0          PASS

Remark: antenna gain=0dBi


5G mode

                                Output power to        Power Density at           Limit
          Channel                                                      2                  2    Result
                                 antenna (mW)         R=20cm (mW/cm )          (mW/cm )

     Lowest (5180MHz)                16.11                  0.0032                1.0          PASS

     Middle (5200MHz)                19.10                  0.0038                1.0          PASS

     Highest (5240MHz)               18.97                  0.0038                1.0          PASS

Remark: antenna gain=0dBi


5.8G mode

                                Output power to        Power Density at           Limit
          Channel                                                      2                  2    Result
                                 antenna (mW)         R=20cm (mW/cm )          (mW/cm )

     Lowest (5745MHz)                 6.14                  0.0012                1.0          PASS

     Middle (5785MHz)                 8.49                  0.0017                1.0          PASS

     Highest (5825MHz)               11.89                  0.0024                1.0          PASS


Remark:
1.   Antenna gain=0dBi
2.   The max power density is less than SAR exempt limit, so SAR evaluation is not required.



Document Created: 2019-03-12 03:30:39
Document Modified: 2019-03-12 03:30:39

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