Attachment Attachment B

This document pretains to SES-STA-20071120-01599 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2007112001599_606560

EXHIBIT B Radiation Hazard Report Page 1 of 5 Analysis of Non—lonizing Radiation for a 12.5—Meter Earth Station System This report analyzes the non—ionizing radiation levels for a 12.5—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/Uncontrolled 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. Table 1. Limits for General Population/Uncontrolled Exposure (MPE) Frequency Range (MHz) Power Density ({mWicm*) 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 Frequency (MHz)*(4.0/1200) 1500—100,000 _ | 5.0 Table 3. Formulas and Parameters Used for Deterrhining Power Flux Densities Parameter Symbol Formula Value _ Units Antenna Diameter D Input 12.5 m Antenna Surface Area Asurface 1 D/ 4 122.72 m* Subreflector Diameter Dsr Input 154.0 cm Area of Subreflector Asr x Ds, /4 18626.50 cm* Frequency F Input 14250 MHz Wavelength A 300 / F 0.021053 m Transmit Power P Input 540.00 W Antenna Gain (dBi) ‘Geg Input 64.1 dBi Antenna Gain (factor) G 10ces" 2570395.8 n/a Pi T Constant 3.1415927 n/a Antenna Efficiency n G(1D) _ 0.74 n/a

EXHIBIT B Radiation Hazard Report L Page 2 of 5 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 R; = 0.60 D@/ a (1) | — = 4453.1 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/(4rRy*) (2) - = 5.570 W/im* = 0.557 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, thepower 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 Ry =D/(42) (3) = 1855.5 m The maximum power density in the Near Field can be determined from the following equation: Near Field Power Density Sy = 16.0 n P / (nD) (4) = 13.003 W/m* = 1.300 mW/cm* 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 Ry/R (5) = 1.300 mW/cm*

EXHIBIT B Radiation Hazard Report Page 3 of 5 4. Regibn 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 / AS,F (6) ~o =—= 115.964 mW/icm* 5. Main Reflector Region The power density in the main reflector is determined in the same manner as the power density at the subreflector. The area is now the area of the main reflector aperture and can be determined from the following equation: | ' Power Density at the Main Reflector Surface Ssurtace 7 4 P / Asurface (7) = 17.601 W/m" = 1.760 mW/cm* 6. Region between the Main Reflector and the Ground Assuming uniform illumination of the reflector surface, the powe'r density between the antenna and the ground can be determined from the following equation: Power Density between Reflector and Ground Sg =P / Agurface (8) = 4.400 W/im* _ = 0.440 mW/cm*

EXHIBIT B Radiation Hazard Report Page 4 of 5 7. Summary of Calculations Table 4. Summary of Expected Radiation levels for Uncontrolled Environment Calculated Maximum Radiation Power Density Level Region ({mWicm*) _: .___Hazard Assessment 1. Far Field (Rg; = 4453.1 m) _ S¢ 0.557 Satisfies FCC MPE 2. Near Field (R,; = 1855.5 m) _ _: Sar 1.300 Potential Hazard 3. Transition Region (R»; < R, < Rg) S, 1.300 Potential Hazard 4. Between Main Reflector and Ssr 115.964 Potential Hazard Subreflector | — — 5. Main Reflector Ssurface 1.760 Potential Hazard 6. Between Main Reflector and Ground Sq 0.440 Satisfies FCC MPE Table 5. Summary of Expected Radiation levels for Controlled Environment Calculated Maximum Radiation Power Density Region . Level (mW/cm*) Hazard Assessment 1. Far Field (Rg = 4453.1 m) S¢ 0.557 Satisfies FCC MPE 2. Near Field (Ry; = 1855.5 m) Sn _1.300 Satisfies FCC MPE 3. Transition Region (Ry < R, < Rg) S, 1.300 Satisfies FCC MPE 4. Between Main Reflector and Ssr 115.964 Potential Hazard Subreflector | . 5. Main Reflector ' ' Sgurface 1.760 Satisfies FCC MPE 6. Between Main Reflector and Ground «_ Sy 0.440 Satisfies FCC MPE It is the. applicant‘s responsibilify to ensure that the public and operati‘onal personnel are not exposed to harmful levels of radiation. ' 8. Conclusions Based on the above analysis it is concluded that the FCC MPE guidelines have been exceeded (or met) in the regions of Table 4 and 5. The applicant proposes to comply with the MPE limits by one or more of the following methods. Means of Compliance Uncontrolled Areas This antenna will be located in a fenced area. The fenced are will be sufficient to prohibit the general public from having access the areas that exceed the MPE limits Since one diameter removed from the main beam of the antenna or 14 diameter removed from the edge of the antenna the RF levels are reduced by a factor of 100 or 20 dB. None of the areas exceeding the MPE levels will be accessible by the general public. Radiation hazard signs will be posted while this earth station is in operation.

EXHIBIT B Radiation Hazard Report ‘ , Page5of5 The applicant will ensure that no buildings or other obstacles will be in the areas that exceed the MPE levels. Means of Compliance Controlled Areas The earth station‘s operational personnel will not have access to the areas that exceed the MPE levels while the earth station is in operation. _ The transmitters will be turned off during antenna maintenance.‘


Document Created: 2007-11-21 08:55:55
Document Modified: 2007-11-21 08:55:55
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