RF Exposure

FCC ID: X4YHACSN4U1

RF Exposure Info

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FCCID_4421456

                              RF Exposure evaluation

FCC ID: X4YHACSN4U1

1. Reference
According to §1.1307(b)(1), systems operating under the provisions of this section shall be
operated in a manner that ensures that the public is not exposed to radio frequency energy
level in excess of the Commission’s guidelines.
According to §1.1310 and §2.1091 RF exposure is calculated.
KDB447498 D01: Mobile and Portable Devices RF Exposure Procedures and Equipment
Authorization Policies

2. Limit
Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure
   Frequency      Electric Field    Magnetic Field     Power Density         Averaging Time
  Range(MHz)      Strength(V/m)      Strength(A/m)        (mW/cm²)              (minute)
                      Limits for Occupational/Controlled Exposure
    0.3 – 3.0          614                1.63              (100) *                  6
    3.0 – 30          1842/f             4.89/f            (900/f2)*                 6
    30 – 300           61.4              0.163                1.0                    6
   300 – 1500            /                  /                f/300                   6
1500 – 100,000           /                  /                  5                     6

Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure
   Frequency      Electric Field    Magnetic Field     Power Density         Averaging Time
  Range(MHz)      Strength(V/m)      Strength(A/m)        (mW/cm²)              (minute)
                      Limits for Occupational/Controlled Exposure
    0.3 – 3.0           614               1.63              (100) *                 30
    3.0 – 30           824/f             2.19/f            (180/f2)*                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
*=Plane-wave equivalent power density


3. MPE Calculation Method
Predication of MPE limit at a given distance
Equation from page 18 of OET Bulletin 65, Edition 97-01

S=PG/4πR²
Where: S=power density
        P=power input to antenna
        G=power gain of the antenna in the direction of interest relative to an isotropic radiator
        R=distance to the center of radiation of the antenna

4. Result
As declared by the Applicant, the EUT is a wireless device used in a fix application, at least
20 cm from any body part of the user or nearby persons; from the maximum EUT RF output
power, the minimum separation distance, r =20cm, as well as the gain of the used antenna is
0dBi, the RF power density can be obtained.
                 Max.          Max.                        Power            Power
                                           Antenna
Frequency       Output        Output                      Density         Density           Test
                                             Gain
  (MHz)         Power         Power                       At 20 cm        Limit FCC        Results
                                          (Numeric)
                (dBm)          (mW)                      (mW/cm2)         (mW/cm2)
   2402         4.707          2.956        1.0000         0.00058             1            PASS


5. Conclusion
The SAR evaluation is not required.



Document Created: 2019-08-29 16:40:53
Document Modified: 2019-08-29 16:40:53

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