Attachment Exhibit E

This document pretains to SES-MFS-20100329-00375 for Modification w/ Foreign Satellite (earth station) on a Satellite Earth Station filing.

IBFS_SESMFS2010032900375_808227

‘ Exhibit E Radiation Hazard Réeport ~ Page 1 of 4 Analysis of Non-lonizing Radiation for a 9.0-Mefer'Earth Station System This report analyzes the non—ionizing. radiation levels for a 9.0—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 exposure takes 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/Uncontrolied environment are shown in Table 1. The General Population/Uncontrolled MPE is a function of transmit frequency and is for an exposure period of thirty minutes or less. The MPE limits for persons in an Occupational/Controlled 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. e + Table 1. Limits for General Population/Uncontrolled Exposure (MPE) Frequency Range (MHz) Power Density(mW/icm") 30—300 0.2 . 300—1500 Frequency(MHz)*(0.8/1200) 1500—100,000 1.0 Table 2. Limits for Occupational/Controlled Exposure (MPE) Frequency Range(MHz) __Power Density(mW/cm*) 30—300 1.0 300—1500 _ Freguency (MHz)*(4.0/1200) 1500—100,000 5.0 { Table 3. Formulas and Parameters Used for Determining Power Flux Densities _ Parameter Symbol Formula .____Value Units Antenna Diameter D Input 9.0 m Antenna Surface Area Asurtace x D/ 4 63.62 m* Subreflector Diameter Dsr Input . 116.8 cm Area of Subreflector Asr 1 Ds "/4 10714.59 ~ cm* Frequency F Input 14250 MHz Wavelength A 300 / F 0.021053 m Transmit Power _ P Input 150.00 W Antenna Gain(dBi) Ges Input 60.4 dBi Antenna Gain(factor) G [ 1096478.2 n/a Pi T Constant 3.1415927 °_ n/a Antenna Efficiency n__ GA/(r°D") 0.61 n/a

Exhibit E 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 equation: Distance to the Far Field Region oc Re=060D0b/a _ (1) , = 2308.5 m The maximum main beam power density in thefar field can be determined from the following equation: h On—Axis Power Density in the Far Field S; =GP/(4 1 R;*) (2)" — — | = 2.456 W/m* = 0.246 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 offthe Near Field can be determined from the following equation: Extent of the Near Field Ry = D/ (4 ) (3) = 961.9 m . The maximum power density in the Near Field can be determined from the following equation: Near Field Power Density . Sa = 16.0 m P/ (@D") 4 = 5.733 W/im* \= 0.573 mW/icm* 3. Transition Region Calculation The Transition region is located between the Near and Far Field regions. The power density begins to decrease linearly 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 Near Field region. The power density calculated in Section 1 is the highest power density the antenna can produce in any of 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 =Sy BRy/R (5) = 0.573 mW/icm*

Exhibit E Radiation Hazard Report Page 3 of 4 4. Region between the Main Reflector and the Subreflector Transmissions from the feed assembly are directed toward the subreflector surface, and are reflected back toward the main reflector. The most common feed assemblies are waveguide flanges, horns or subreflectors. The energy between the subreflector and the reflector surfaces can be calculated by determining the power density at the subreflector surface. This can be determined from the following equation: Power Density at the Subreflector - Ss, = 4000 P / Asr | (6) = 55.998 mW/cm* . 5. Main Reflector Region Thé power density in the main reflector is determined in the same manner as the power density at the subreflector. Thearea is now the area of the main reflector aperture and can be determined from the following equation: — Power Density at the Main Reflector Surface Scurtace 7 4 P / Asurtace (7) . ~ = 9.:431 W/im* + = 0.943 mW/cm* 6. Region between the Main Reflector and the Ground Assuming uniform iflumination of the reflector surface, the power density between the antenna and the ground can be determined from the following equation: Power Dens1ty between Reflector and Ground Sg = P / Asurface (8) = 2.358 W/m* = 0.236 mW/cm*

. Exhibit E Radiation Hazard Report Page 4 of 4 7. Summary of Calculations — ~ Table 4. Summary of Expected Radiation levels for Uncontrolled Environment Calculated Maximum Radiation Power Density Level Region (mW/icm*) - 1. Far Field (R;=2308.5 m) Sq¢ 0.246 Satisfies FCC MPE 2. Near Field(R,y; = 961.9 m) Sn 0.573 Satisfies FCC MPE 3. Transition Region (Ry < R, < Rg) S; 0.573 Satisfies FCC MPE 4. Between Main Reflector and Ssr 55.998 Potential Hazard Subreflector > | — 5. Main Reflector | Ssurface 0.943 Satisfies FCC MPE 6. Between Main Reflector and Ground Sq 0.236° Satisfies FCC MPE . Table 5. Summary of Expected Radiation levels for Controlled Environment Calculated Maximuim Radiation Power Density Region Level (mW/em") Hazard Assessment 1. Far Field (Rg= 2308.5 m) Sg 0.246 Satisfies FCC MPE 2. Near Field (Ry;= 961.9 m) Saf 0.573 Satisfies FCC MPE 3. Transition Region(Ry; <R, < Ryg) S; 0.573 Satisfies FCC MPE 4. Between Main Reflector and Ser 55.998 Potential Hazard Subreflector | 5. Main Reflector Ssurface 0.943 . Satisfies FCC MPE 6. Between Main Reflector and Ground Sq 0.236 Satisfies FCC MPE It is thé 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 complied with . for those regions with close proximity to the reflector that exceed acceptable levels.


Document Created: 2010-03-29 10:47:47
Document Modified: 2010-03-29 10:47:47
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