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MPE

Dongguan Chuangtong Shiji Technology Co.,Ltd. C702 Car DVR Dash Cam 2BOQG-C702 2BOQGC702 c702

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Document DEVICE REPORTGetApplicationAttachment.html?id=8200123 
FCC ID:2BOQG-C702

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)

Frequency range (MHz)

Electric field strength (V/m)

Magnetic field strength (A/m)

Power density (mW/cm2)

Averaging time (minutes)

(A) Limits for Occupational/Controlled Exposures

0.3­3.0

614

1.63

*(100)

6

3.0­30

1842/f

4.89/f

*(900/f2)

6

30­300

61.4

0.163

1.0

6

300­1500

f/300

6

1500­100,000

5

6

(B) Limits for General Population/Uncontrolled Exposure

0.3­1.34

614

1.63

*(100)

30

1.34­30

824/f

2.19/f

*(180/f2)

30

30­300

27.5

0.073

0.2

30

300­1500

f/1500

30

1500­100,000

1.0

30

f = frequency in MHz 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 id the limit of MPE, 1 mW/cm2. 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

Mode

Frequency

Output power

(MHz)

(dBm)

802.11b

2412

13.119

802.11g

2437

12.428

802.11n20

2437

11.788

802.11n40

2452

11.766

Note: Antenna Gain = 1.73dBi

2.4G WIFI

Tune-up Max tune-up Max tune-up

power

power

power

(dBm) 13±1 12±1 11±1 11±1

(dBm) 14 13 12 12

(mW) 25.12 19.95 15.85 15.85

Power Density at R=20cm (mW/cm2) 0.007443 0.005912 0.004696 0.004696

Limit
(mW/cm2) 1.0 1.0 1.0 1.0

Result
PASS PASS PASS PASS

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