RF Exposure report

FCC ID: 2AFRJNKP01

RF Exposure Info

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FCCID_4394545

RF EXPOSURE EVALUATION

EUT Specification
EUT                           Noke KeyPad
Model Number                  NKP01
FCC ID                        2AFRJNKP01
Antenna gain (Max)            3dBi for BT and 2.4G
Operation Frequency           2402-2480MHz for BT and 2.4G
Input Rating                  DC 24V
Modulation                    GFSK for BT and 2.4G
Max. output power             -0.51dBm(0.000889W) for BT



Test Requirement:
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       Electric Field   Magnetic           Power      Average
Range(MHz)      Strength(V/m)      Field      Density(mW/cm2)   Time
                               Strength(A/m)
              (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


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

Where
Pd= Power density in mW/cm2
Pout=output power to antenna in mW
G= Numeric gain of the antenna relative to isotropic antenna
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 nd total
power input to the antenna, through the calculation, we will know the distance
where the MPE limit is reached.


    11.2 Measurement Result
Antenna gain: 3 dBi

BLE:
                                                Antenn                    Power
                    Measu   Tune-     Max
         Channe                                    a       Evaluation     density
                      red     up    tune-up
 Mode    l Freq.                                 Gain        result        Limits
                    power   power    power
          (MHz)                                 Numeri     (mW/cm2 )      (mW/c
                    (dBm)   (dBm)    (dBm)
                                                   c                        m2 )
 GFSK        2402   -0.51    0±1       1         1.995      0.000500         1
 GFSK        2440   -0.76   -1±1       0         1.995      0.000397         1
 GFSK        2480   -1.07   -1±1       0         1.995      0.000397         1




Signature:




 Alan He
 Date: 2019-08-06



Document Created: 2019-08-09 19:23:29
Document Modified: 2019-08-09 19:23:29

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