RF Exposure

FCC ID: S8J-WR3000

RF Exposure Info

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FCCID_2519620

RF EXPOSURE EVALUATION

EUT Specification
EUT                       300Mbps Wireless N Router
FCC ID                    S8J-WR3000
Frequency            band    WLAN: 2.412GHz ~ 2.462GHz
(Operating)                  WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz
                             WLAN: 5.745GHz ~ 5825GHz
                             Others
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         15.71dBm for 802.11b;
                          12.36dBm for 802.11g;
                          15.27dBm for 802.11/n(HT20);
                          14.38dBm for 802.11n(HT40);
Antenna gain (Max)        5.0dBi ( for per antenna port Max)
                          8.01dBi for MIMO(Ant0+Ant3 Directional Gain)
Evaluation applied           MPE Evaluation
                             SAR Evaluation




                                   1


Applicable Standard:

   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
levels in excess limit for maximum permissible exposure. In accordance with
47 CFR FCC Part 2 Subpart J. Section 2.1091 this device has been defined as
a mobile device whereby a distance of 0.2m Normally can be maintained
between the user and the device.

Limits for Maximum Permissible Exposure(MPE)

 Frequency        Electric Field Magnetic Field          Power              Average
Range(MHz)       Strength(V/m) Strength(A/m)       Density(mW/cm2)           Time
                  (A) Limits for Occupational/Control Exposures
   0.3-3.0             614              1.63              (100)*                  6
   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
1500-100000             --               --                  5                    6
             (B) Limits for General Population/Uncontrol Exposures
    0.3-1.34             614            1.63              (100)*                  30
    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
 1500-100000              --             --                  1                    30


 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 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.




                                       2


            Measurement Result
            Max power Result:

            Operation     Channel      Channel          Measurement Level   Limit
             Mode         Number     Frequency               (dBm)         (dBm) Verdict
                                        (MHz)          Ant0   Ant3    Sum
                             1           2412         14.97  15.71     --    30    PASS
             802.11b         6           2437         15.34  15.43     --    30    PASS
                            11           2462         15.15  15.41     --    30    PASS
                             1           2412         11.65  12.36     --    30    PASS
             802.11g         6           2437         11.23  12.18     --    30    PASS
                            11           2462         11.36  12.06     --    30    PASS
                             1           2412         11.07  12.21   14.69   30    PASS
             802.11n
                             6           2437         12.13  12.38   15.27   30    PASS
             (HT20)
                            11           2462         12.04   12.11  15.09   30    PASS
                             3           2422         10.48   11.58  14.08   30    PASS
             802.11n
                             6           2437         11.02   11.37  14.21   30    PASS
             (HT40)
                             9           2452         11.45   11.29  14.38   30    PASS
            Note: For MIMO system, Maximum Conducted Output Power is summed at the total
                 transmit power delivered to all antennas.

            Antenna 0:

                          Tune up                                                   Power
                                                   Output                                         Power
                         tolerance   Max tune up               Ant.                density at
Operating    Test                                  Peak                Ant. Gain                 density
                           (dBm)      conducted                Gain                  20cm
 Mode       Channel                                power               (numeric)                  Limits
                                     power(dBm)                (dBi)                 (mW/
                                                   (mW)                                         (mW/cm2 )
                                                                                     cm2 )
                1         15±1           16            39.81    5       3.162      0.025043        1
802.11b         6         15±1           16            39.81    5       3.162      0.025043        1
               11         15±1           16            39.81    5       3.162      0.025043        1
                1         12±1           13            19.95    5       3.162      0.012551        1
802.11g         6         11±1           12            15.85    5       3.162      0.009970        1
               11         11±1           12            15.85    5       3.162      0.009970        1
                1         11±1           12            15.85    5       3.162      0.009970        1
802.11n
                6         12±1           13            19.95    5       3.162      0.012551        1
 (H20)
               11         12±1           13            19.95    5       3.162      0.012551        1
                3         10±1           11            12.59    5       3.162      0.007919        1
802.11n
                6         11±1           12            15.85    5       3.162      0.009970        1
 (H40)
                9         11±1           12            15.85    5       3.162      0.009970        1



                                                   3


             Antenna 3:

                           Tune up                                                   Power
                                                     Output                                        Power
                          tolerance   Max tune up               Ant.                density at
Operating     Test                                   Peak               Ant. Gain                 density
                            (dBm)      conducted                Gain                  20cm
 Mode        Channel                                 power              (numeric)                  Limits
                                      power(dBm)                (dBi)                 (mW/
                                                     (mW)                                        (mW/cm2 )
                                                                                      cm2 )
                 1         16±1           17            50.12    5        3.162     0.031528         1
802.11b          6         15±1           16            39.81    5        3.162     0.025043         1
                11         15±1           16            39.81    5        3.162     0.025043         1
                 1         12±1           13            19.95    5        3.162     0.012551         1
802.11g          6         12±1           13            19.95    5        3.162     0.012551         1
                11         12±1           13            19.95    5        3.162     0.012551         1
                 1         12±1           13            19.95    5        3.162     0.012551         1
802.11n
                 6         12±1           13            19.95    5        3.162     0.012551         1
 (H20)
                11         12±1           13            19.95    5        3.162     0.012551         1
                 3         12±1           13            19.95    5        3.162     0.012551         1
802.11n
                 6         11±1           12            15.85    5        3.162     0.009970         1
 (H40)
                 9         11±1           12            15.85    5        3.162     0.009970         1

             MPE Result:

 Operation     Channel       Channel      Power density at 20cm (mW/ cm2 )            Power
  Mode         Number       Frequency       Ant0         Ant3       Sum              density
                                                                                                  Verdict
                              (MHz)                                                   Limits
                                                                                    (mW/cm2 )
                   1           2412       0.025043         0.031528         --          1         PASS
  802.11b          6           2437       0.025043         0.025043         --          1         PASS
                  11           2462       0.025043         0.025043         --          1         PASS
                   1           2412       0.012551         0.012551         --          1         PASS
  802.11g          6           2437       0.009970         0.012551         --          1         PASS
                  11           2462       0.009970         0.012551         --          1         PASS
                   1           2412       0.009970         0.012551     0.022521        1         PASS
  802.11n
                   6           2437       0.012551         0.012551     0.025102        1         PASS
  (HT20)
                  11           2462       0.012551         0.012551     0.025102        1         PASS
                   3           2422       0.007919         0.012551      0.02047        1         PASS
  802.11n
                   6           2437       0.009970         0.009970      0.01994        1         PASS
  (HT40)
                   9           2452       0.009970         0.009970      0.01994        1         PASS




                                                    4



Document Created: 2015-01-29 13:31:56
Document Modified: 2015-01-29 13:31:56

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