RF Exposure

FCC ID: YR8ES810CM

RF Exposure Info

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FCCID_3927457

FCC §1.1310 & §2.1091- MAXIMUM PERMISSIBLE EXPOSURE (MPE)

Applicable Standard

According to subpart 1.1310, 2.1091 systems operating under the provisions of this section shall be operated
in a manner that ensures the public is not exposed to RF energy level in excess of the communication
guidelines.

Limits for General Population/Uncontrolled Exposure
Frequency Range Electric Field Magnetic Field Power Density Averaging Time
(MHz) Strength (V/m) Strength (A/m) (mW/cm ) 2
(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

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 Evaluation Power
Antenna Gain Conducted MPE Limit
Mode Range Distance Density
(MHz) Power 2
(mW/cm2)
(cm) (mW/cm )
(dBi) (numeric) (dBm) (mW)
GPRS 850 824~849 2.66 1.845 29 794.33 20 0.2917 0.55

EDGE 850 824~849 2.66 1.845 24 251.19 20 0.0922 0.55

GPRS 1900 1850~1910 5.50 3.548 27 501.19 20 0.3539 1.00

EDGE 1900 1850~1910 5.50 3.548 23 199.53 20 0.1409 1.00

Band 2 1850-1910 5.50 3.548 21.50 141.254 20 0.100 1.00

Band 4 1710-1755 5.22 3.327 21.50 141.254 20 0.093 1.00

Band 5 824-849 2.66 1.845 23.50 223.872 20 0.082 0.55

Band 12 699-716 1.65 1.462 23.00 199.526 20 0.058 0.47

Band 13 777-787 1.09 1.285 23.00 199.526 20 0.051 0.52

Band 26 814-849 2.66 1.845 23.00 199.526 20 0.073 0.54

Note: For GPRS Mode, the time based average power is relevant, the difference in between depends on the
duty cycle of the TDMA signal.

Number of Time slot 1 2 3 4
Duty Cycle 1:8 1:4 1:2.66 1:2
Time based Ave. power compared to
-9 dB -6 dB -4.25 dB -3 dB
slotted Ave. power

Result: The device meet FCC MPE at 20 cm distance.

Document Created: 2018-07-16 14:04:02
Document Modified: 2018-07-16 14:04:02

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