RF Exposure

FCC ID: 2AOK9-MIDRIVED04

RF Exposure Info

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FCCID_4389610

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RKSA190523004-00B

FCC §1.1310 & §2.1091 –MAXIMUM PERMISSIBLE EXPOSURE (MPE)
Applicable Standard

According to subpart §2.1091 and subpart §1.1310, 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.

Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091)

(B) Limits for General Population/Uncontrolled Exposure

Frequency Range Electric Field Magnetic Field Power Density Averaging Time
(MHz) Strength (V/m) Strength (A/m) (mW/cm2) (minutes)

0.3-1.34 614 1.63 *(100) 30
1.34-30 824/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;

According to §1.1310 and §2.1091 RF exposure is calculated.

Calculated Formulary:
Predication of MPE limit at a given distance
S = PG/4πR² = power density (in appropriate units, e.g. mW/cm2);
P = power input to the antenna (in appropriate units, e.g., mW);
G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is
normally numeric gain;
R = distance to the center of radiation of the antenna (appropriate units, e.g., cm);

Calculated Data:

Tune-up
Frequency Antenna Gain Conducted Evaluation Power
MPE Limit
Mode Range Power Distance Density
(mW/cm2)
(MHz) (cm) (mW/cm2)
(dBi) (numeric) (dBm) (mW)
802.11b 1.00 1.26 19.00 79.43 20 0.0199 1.0
802.11g 2412~2462 1.00 1.26 20.00 100.00 20 0.0251 1.0
802.11
1.00 1.26 19.50 89.13 20 0.0223 1.0
n-HT20
802.11
2422~2452 1.00 1.26 19.50 89.13 20 0.0223 1.0
n-HT40

Note: The tune-up conducted power was declared by the manufacturer.

Conclusion: The device meets MPE at distance 20cm.

FCC Part 15.247 Page 12 of 60

Document Created: 2019-08-07 11:26:19
Document Modified: 2019-08-07 11:26:19

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