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© Hexagon Mining
8
Appendix B: FCC Maximum Permissible Exposure
Calculations
Reference:
FCC document ‘Evaluating Compliance with FCC Guidelines for Human Exposure to
Radiofrequency Electromagnetic Fields.
From herein this document is referred to as the ‘FCC
Guideline to MPE’ document.
8.1
OAS-LV Intentional Radiators
The OAS-LV units comprise the following RF intentional radiators
8.1.1 Wi-Fi
Radio: Max Power 16 dBm (39.81 mW)
Antenna: 2.5 dBi, 2400 GHz to 2500 MHz
– 3.0 dBi, 4900 MHz to 5900 MHz
Reference documents:
Refer Supplied Wi-Fi radio and Wi-Fi antenna data sheets.
8.1.2 GSM (LTE, 4G)
Radio: LTE and UMTS module, Max Power 23 dBm (200 mW)
Antenna: Gain 2.9 dBi, 698-960MHz, 4.3dBi 1710-2690MHz
Refer supplied Product Technical Specification and Antenna Specification for further information.
8.2
MPE Calculations
8.2.1 MPE Formula
The FCC Guide to MPE document section 3
‘Methods of Predicting Human Exposure’ page 17,
advises to use the following formula
S = P
•G / 4•π•R
2
R = (P
•G / 4•π•S)
0.5
Where
S = Power Density (MPE) mW/cm
2
P = Power input to antenna (power output from radio) (mW)
G = Power gain of antenna relative to isotropic radiator (converted from dBi)
R = Distance from antenna (cm)
8.2.2 Wi-Fi MPE and LTE (LTE, 4G) Calculations
8.2.2.1
LTE 300 to 1500 MHz
Referring to The FCC Guide to MPE document, Appendix A, Table 1 (B) Limits for General
Population/Uncontrolled exposure (300 MHz to 1500 MHz).
