Attachment Exhibit B

This document pretains to SES-LIC-20110210-00136 for License on a Satellite Earth Station filing.

IBFS_SESLIC2011021000136_868071

_ Exhibit B Radiation Hazard Report Page1 of 4 Analysis of Non—lonizing Radiation for a 1.2—Meter Earth Station System This report analyzes the non—ionizing radiation levels for a 1.2—meter earth station system. The analysis and calculations performed in this report comply with the methods described in the FCC Office of Engineering and Technology Bulletin, No. 65 first published in 1985 and revised in 1997 in Edition 97—01..The radiation > safety limits used in the analysis are in conformance with the FCC R&O 96—326. Bulletin No. 65 and the ~ — FCC R&O specifies that there are two separate tiers of exposure limits that are dependant on the situation in which the exposuretakes place and/or the status of the individuals who are subject to the exposure. The Maximum Permissible Exposure (MPE) limits for persons in a General Population/Uncontrolled environment are shown in Table 1. The General Population/Uncontrolled MPE is a function of transmitfrequency and is > for an exposure period of thirty minutes or less. The MPE limits for persons in an Occupational/Controlied environment are shown in Table 2. The Occupational MPE is a function of transmit frequency and is for an exposure period of six minutes or less. The purpose of the analysis described in this report is to determine the power flux density levels of the earth station in the far—field, near—field, transition region, between the subreflector or feed and main reflector surface, at the main reflector surface, and between the antenna edge and the 'ground and to compare these levels to the specified MPEs. > Table 1. Limits for General Population/Uncontrolled Exposure (MPE) Frequency Range (MHz) _Power Density (mW/icm*) 30—300 0.2 300—1500 Frequency (MHz)*(0.871200) 1500—100,000 1.0 Table 2. Limits for Occupational/Controlled Exposure (MPE) Frequency Range (MHz) _Power Density (mWi/icm*) 30—300 1.0 300—1500 _ Frequenicy (MHz)*(4.0/1200) 1500—100,000 5.0 Table 3. Formulas and Parameters Used for Determining Power Flux Densities Parameter Formula Value . Units Antenna Diameter Input 1.2 m Antenna Surface Area zx D/ 4 1.13 m Feed Flange Diameter Input 7.6 ocm Area of Feed Flange Afa x D; *4 45.36 cm* Frequency F _ Input 14250 ‘MHz Wavelength A 300 / F 0.021053 . m Transmit Power P Input 1.00 W Antenna Gain (dBi) CGe Input 42.4 dBi Antenna Gain(factor) G 4 gces" _17378.0 n/a Pi T Constant 3.1415927 n/a Antenna Efficiency m G/(1°D") 0.54 n/a

Radiation Hazard Report Page 2 of 4 1. Far Field Distance Calculation The distance to the beginning of the far field can be determined from the following eq'uation: | Distance to the Far Field Region — Ry =0.60 D/A (1) — — ‘ =41.0 m The maximum main beam power density in the far field can be determined from the following equation: | On—Axis Power Density in the Far Field S; =GP/(4 1 Ry") (2) . = 0.821 W/im* = 0.082 mW/cm* 2. Near Field Calculation Power flux density is considered to be at a maximum value throughout the entire length of the defined Near Field region. The region is contained within a cylindrical volume having the same diameter as the antenna. Past the boundary of the Near Field region, the power density from the antenna decreases linearly with respect to increasing distance. The distance to the end of the Near Field can be determined from the following equation: Extent of the Near Field | — Re = D*J (4 2) (3). ‘ =17.1 m The maximum power density in the Near Field can be determined from the following equation: Near Field Power Density ‘ Sy = 16.0 1 P / (x D) (4) | = 1.917 Wim® < = 0.192 mW/icm* )l {10. 3. Transition Region Calculation | "The Transition region is located between the Near and Far—Field regions. The power density . — ~begins to decrease linsarly with increasing distance in the Transition region. While the power . density decreases inversely with distance in the Transition region, the power density decreases‘ ~inversely with the square of the distance in the Far Field region. The maximum power density in .— the Transition region will not exceed that calculated for the NearField region. The power density calculated in Section 1 isthe highest power density the antenna can producein anyof the regions away from the antenna. The power density at a distance R, can be determined from the following equation: * Transition Region Power Density S; = Sn Rnr/ Ri (5) =0.192 mWicm*

Radiation Hazard Report | Page 3 of 4 g4 4. Reglon between the Feed Assembly and the Antenna Reflector Transmlssmns from the feed assembly are directed toward the.antennareflector surface, and are confined within a conical shape defined by the type of feed assembly. The most common feed assemblies are waveguide flanges, horns or subreflectors. The energy between the feed assembly. . and. reflector surface can be calculated by determining the power densnty at the feed assembly — surface. This can be determined from the followmg equation: P — PowerDensxtyat the Feed Flange AsC _ S = 4000 P/Afa. C e (6) 02 — = 88:174 mWicm* . 5. Main Reflector Region ~ ‘The power density in the main reflector is determined in the sémé manner as the power density at the feed assembly. The area is now the area of the reflector apz,rture and can be determined from the following equation: Power Density at the Reflector Surface Ssurtace 7 4 P / Asurface (7) 4 c =3.537 Wim = 0.354 mW/icm* 6. Region between the Reflector and the Ground Assuming uniform illumination of the reflector surface, the power density between the antenna and the ground can be determined from the following equation: Power Density between Reflector and Ground _ = P / Asurface (8) = 0.884 W/im* = 0.088 mW/em*

Radiation Hazard Report Page 4 of 4 'l 7. _ Summary of Calculations Table 4 Summary of Expected Radiat'ion levels for Uncontrblled Environment Calculated Maximum Radiation Power Density Level Region (mW/icm*) Hazard Assessment 1. Far Field (R; = 41.0 m) > _ S¢ © 0.082 Satisfies FCC MPE~ 2. Near Field (Ry4 2# 17.1‘m) ' > Sn 0.192 Satisfies FCC MPE 3. Transition Region (Ry < R, < Rg) .S; 0.192 Satisfies FCC MPE: 4. Between FEeed Assembly and Sia ©88.174 Potential Hazard Antenna Reflector _3 : 5. Main Reflectot‘ ho s Ssurface 0.354 Satisfies FCC MPE 6. Between Reflebtor and Ground | Sp 0.088 _ Satisfies FCC: MPE Table 5. Summary of Expected Radiation levels for Controlled Environment Calculated Maximum Radiation Power Density - . Region Level (mW/icm*) Hazard Assessment 1. Far Field (R;= 41.0 m) S¢ 0.082 Satisfies FCC MPE 2. Near Field (Ry= 17.1 m) Srnt 0.192 Satisfies FCC MPE 3. Transition Region (Ry <R, < Rg) S; 0.192 Satisfies FCC .MPE 4. Between Feed Assembly and Sta 88.174 Potential Hazard Antenna Reflector : 5. Main Reflector Ssurface 0.354 Satisfies FCC MPE 6. Between Reflector and Ground Sy 0.088 Satisfies FCC MPE It is the applicant‘s responsibility to ensure that the public and operational personnel are not exposed to harmful levels of radiation. ; 8. Conclusions Based on the above analysis it is concluded that harmful levels of radiation will not exist in regions normally occupied by the public or the earth station‘s operating personnel. The transmitter will be turned off during antenna maintenance so that the FCC MPE of 5.0 mW/cm2 will be complled with for those regions with close proxnmlty to the reflector that exceed acceptable levels. .


Document Created: 2011-02-09 16:49:07
Document Modified: 2011-02-09 16:49:07
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