RF exposure letter

FCC ID: 2ASBG-YH8230L

RF Exposure Info

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FCCID_4309616

FCC ID : 2ASBG-YH8230L

1. RF EXPOSURE

1.1.The Requirement
System 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
of the Commission’s guidelines. See Section 15.247(b)(4) and Section 1.1307(b)(1)

1.2.Limit For Maximum Permissible Exposure (MPE)

Limits for General Population/ Uncontrolled Exposure
Power Density Averaging Time
Frequency Electric Field Magnetic Field
(S) 2 2
Range Strength (E) Strength (H) E ,H or S
2
(MHz) (V/m) (A/m) ( mW/cm )
(minutes)
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
1500-100,000 1.0 30

F = frequency in MHz, * Plane-wave equivalent power density

1.3.MPE Calculation Method
Predication of MPE limit at a given distance
Equation from page 18 of OET Bulletin 65, Edition 97-01
S=PG/4πR²

Where: S=power density
P=power input to antenna
G=power gain of the antenna in the direction of interest relative to an isotropic
radiator
R=distance to the center of radiation of the antenna

From the peak EUT RF output power, the minimum mobile separation
distance, d=0.2m, as well as the gain of the antenna is 2dBi, the RF power
density can be obtained.

1.4.TEST RESULTS
Maximum measured transmitter power

We recorded the worse case
Test Minimum Output Target Target Antenna Power Power
Frequency Separation Power power power Gain Density Density Test
Distance (dBm) (dBm) (mW) (Numeric) At 20 cm Limit Results
（MHz）
(cm) (mW/cm2) (mW/cm2)
2480 20.00 6.03 6±1 5.012 1.585 0.0016 1.000 Pass

Antenna Gain = 2dBi

The measurement results comply with the FCC Limit per 47 CFR 2.1091 for the
uncontrolled RF Exposure.

1.5.FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. In order to avoid the possibility of exceeding the FCC radio
frequency exposure limits, Human proximity to the antenna shall not be less than
20cm(8 inches) during normal operation. Proposed RF exposure safety information to
include in User’s Manual.

Document Created: 2019-06-06 15:48:12
Document Modified: 2019-06-06 15:48:12

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