MPE Report

FCC ID: 2AHJX-ALPHA2

RF Exposure Info

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FCCID_3047435

$FCC ID: 2AHJX-ALPHA2 RF EXPOSURE EVALUATION According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency(RF) Radiation as specified in §1.1307(b) Limits for Maximum Permissible Exposure (MPE) Frequency Electric Field Magnetic Field Power Average Time Range(MHz) Strength(V/m) Strength(A/m) Density(mW/cm2) (A) Limits for Occupational/Control Exposures 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 300-1500 -- -- F/1500 6 1500-100000 -- -- 1 30 11.1 Friis transmission formula: Pd= (Pout*G)\ (4*pi*R2) Where Pd= Power density in mW/cm2 Pout=output power to antenna in mW G= Numeric gain of the antenna relative to isotropic antenna Pi=3.1416 R= distance between observation point and center of the radiator in cm(20cm) Pd the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. mW=10^(dBm/10)$

11.2 Measurement Result
Operation Frequency: WIFI 802.11b/g/n HT20: 2412-2462MHz,
Power density limited: 1mW/ cm2
Antenna Type: Coaxial Antenna
Antenna gain: 1.84dBi,
R=20cm
mW=10^(dBm/10)
802.11b/g/n:

Power
Channe conducted conducted Max Antenna Evaluation
Tune-up density
l Freq. modulation power power tune-up power Gain result
power (dBm) Limits
(MHz) (mW) (dBm) (dBm) Numeric (mW/cm2 )
(mW/cm2)

1.53
2412 802.11b 17.30 12.38 0.0053 1
13±1 14
1.53
2437 802.11b 18.71 12.72 0.0057 1
13±1 14
1.53
2462 802.11b 20.00 13.01 0.0061 1
13±1 14
1.53
2412 802.11g 8.24 9.16 0.0025 1
10±1 11
1.53
2437 802.11g 9.02 9.55 0.0027 1
10±1 11
1.53
2462 802.11g 8.41 9.25 0.0026 1
10±1 11
802.11n 1.53
2412 5.74 7.59 0.0017 1
H20 8±1 9
802.11n 1.53
2437 6.25 7.96 0.0019 1
H20 8±1 9
802.11n 1.53
2462 5.65 7.52 0.0017 1
H20 8±1 9

Operation Frequency: 2402MHz~2480MHz
Power density limited: 1mW/ cm2
Antenna Type: PCB Antenna
Antenna gain: 1.84dBi,
R=20cm
mW=10^(dBm/10)

Bluetooth DSS:
conducted conducted Power density
Max Antenna Evaluation result
power power Limits
Channel Tune-up
Freq. modulation power tune-up
(mW) (dBm) Gain (mW/cm2) (mW/cm2 )
(MHz) (dBm) power
(dBm) Numeric
2402 1.54 1.87 2±1 3 1.53 0.0005 1
2441 GFSK 1.59 2.01 2±1 3 1.53 0.0005 1
2480 1.58 2.00 2±1 3 1.53 0.0005 1
2402 1.77 2.48 2±1 3 1.53 0.0005 1
π/4- 2±1
2441 1.81 2.57 3 1.53 0.0005 1
DQPSK
2480 1.82 2.60 2±1 3 1.53 0.0005 1
2402 1.97 2.95 3±1 4 1.53 0.0006 1
2441 8DPSK 2.00 3.02 3±1 4 1.53 0.0006 1
2480 2.00 3.02 3±1 4 1.53 0.0006 1

Conclusion:
For the max result : 0.0061≤ 3.0 for 1g SAR, No SAR is required.

Document Created: 2016-06-28 17:01:47
Document Modified: 2016-06-28 17:01:47