Attachment RADHAZ

This document pretains to SES-RWL-20101014-01289 for Renewal on a Satellite Earth Station filing.

IBFS_SESRWL2010101401289_845278

Environmental Assessment Boeing Proprietary The Boeing Company Submitted by: Nathan A Miller The Boeing Company Frequency Management Service Seattle, WA (206) 544-6045 Per CFR 47, section 1.1307.b(1), Table 1, all applications for experimental operations with an ERP greater than 100 watts require evaluation for compliance with human exposure limits defined in section 1.1310, and if exceeded require submission of an Environmental Assessment as defined in section 1.1311. This report presents an analysis of the non-ionizing radiation levels for a Prodelin 2.4 meter and Vertex 3.8 meter. The calculations used in this analysis were derived from and comply with the procedures outlined in the Federal Communication Commission, Office of Engineering and Technology Bulletin Number 65, which establishes guidelines for human exposure to Radio Frequency Electromagnetic Fields. Bulletin 65 defines exposure levels in two separate categories, the General Population/Uncontrolled Areas limits, and the Occupational/Controlled Area limits. The Maximum Permissible Exposure (MPE) limit of the General Population/Uncontrolled Area is defined in Table (1), and represents a maximum exposure limit averaged over a 30 minute period. The MPE limit of the Occupational/Controlled Area is defined in Table (2), and represents a maximum exposure limit averaged over a 6 minute period. The purpose of this report is to provide an analysis of the earth station power flux densities, and to compare those levels to the specified MPE’s. This report provides predicted density levels in the near field, far field, transition region, main reflector surface area, area between the main reflector and sub reflector or feed assembly, as well as the area between the antenna edge and ground.

Environmental Assessment Boeing Proprietary MPE Limits for General Population/Uncontrolled Area Frequency Range (MHz) Power Density (mW/cm2) 1500 – 100,000 1.0 Table 1 MPE Limits for Occupational/Controlled Area Frequency Range (MHz) Power Density (mW/cm2) 1500 – 100,000 5.0 Table 2 Prodelin 2.4 Meter Table 3 contains formulas, equations and parameters that were used in determining the Power Flux Density levels for Prodelin 2.4 Meter: Data Type Data Data Formula Data Value Unit of Measure Symbol Power Input P Input 16 W Antenna Size D Input 2.4 M Antenna Area A A = (Π D 2 ) ÷ 4 4.52 M2 Subreflector Size Sub Input 12.4 cm Subreflector Area Asub Asub = (ΠSub 2 ) ÷ 4 120.76 cm2 Gain dBi Gdbi Input 49.2 dBi Gain Factor G G = 10Gdbi/10 83176.38 Gain Factor Frequency f Input 14250 MHz Wavelength λ 299.79 / f 0.021038 Meters Aperture Efficiency η η = [(Gλ 2 ) ÷ (4Π )] ÷ A 0.65 n/a Pi Π Input 3.14159 Numeric Constant M/Sec Input 299,792,458 Numeric Conversion W to mW mW mW = W × 1000 n/a n/a Conversion M to cm cm cm = M × 100 n/a n/a Conversion M2 to cm2 cm2 cm2 = M 2 × 10000 n/a n/a Conversion W/M2 to mW/cm2 mW/cm2 = W / M 2 ÷ 10 n/a n/a mW/cm2

Environmental Assessment Boeing Proprietary Table 3 1. Far Field Analysis The distance to the far field can be calculated using the following formula: 0.6 D 2 R ff = = 164.27 Meters λ The power density in the far field can be calculated using the following formula. Note: this formula requires the use of power in milliwatts and far field distance in centimeters, or requires a post calculation conversion from W/M2: PG S ff = = 0.392 mW/cm2 4Π R ff 2 2. Near Field Analysis The extent of the Near Field region can be calculated using the following formula: D2 Rnf = = 68.45 Meters 4λ The power density of the near field can be calculated using the following formula. Note: this formula requires the use of power in milliwatts and diameter in centimeters, or requires a post calculation conversion from W/M2: 16ηP S nf = = 0.916 mW/cm2 ΠD 2 3. Transition Region Analysis The transition region extends from the end of the near field out to the beginning of the far field. The power density in the transition region decreases inversely with distance from the antenna, while power density in the far-field decreases inversely with the square of the distance. However the power density in the transition region will not exceed the density in the near field, and can be calculated for any point in the transition region (R), using the following formula. Note: This formula requires the use of distance in centimeters, or requires a post calculation conversion from W/M2. S nf Rnf St = = 0.916 mW/cm2 R

Environmental Assessment Boeing Proprietary 4. Main Reflector Surface Area Analysis The maximum power density at the antenna surface area can be calculated using the following formula. Note: this formula requires the use of Power in milliwatts and Area in centimeters squared, or requires a post calculation conversion from W/M2. 4P S surface = = 1.415 mW/cm2 A 5. Subreflector Area Analysis The area between the sub reflector and main reflector presents a potential hazard, with the highest density being located at the sub reflector area. The power density at the sub reflector can be calculated using the following formula. Note: this formula requires the use of Power in milliwatts and Area in centimeters squared, or requires a post calculation conversion from W/M2. 4P Subsurface = = 529.964 mW/cm2 Asub Tables 4 and 5 present a summary of the radiation hazard findings on the Prodelin 2.4 Meter for both the General Population/Uncontrolled Area, as well as the Occupational/Controlled area environments. MPE Limits for General Population/Uncontrolled Area Area Range Meters Power Density Finding (mW/cm2) Far Field 164.27 0.392 mW/cm2 Meets FCC Requirements Near Field 68.45 0.916 mW/cm2 Meets FCC Requirements Transition Region 68.45 – 164.27 0.916 mW/cm2 Meets FCC Requirements Main Reflector Surface N/A 1.415 mW/cm2 Potential Hazard Sub-reflector Surface N/A 529.964 mW/cm2 Potential Hazard Table 4

Environmental Assessment Boeing Proprietary MPE Limits for Occupational/Controlled Area Area Range Meters Power Density Finding (mW/cm2) Far Field 164.27 0.392 mW/cm2 Meets FCC Requirements Near Field 68.45 0.916 mW/cm2 Meets FCC Requirements Transition Region 68.45 – 164.27 0.916 mW/cm2 Meets FCC Requirements Main Reflector Surface N/A 1.415 mW/cm2 Meets FCC Requirements Sub-reflector Surface N/A 529.964 mW/cm2 Potential Hazard Table 5 Based on the above finding there is a potential hazard of radio frequency exposure with use of the Prodelin 2.4 Meter. In order to mitigate the risk of these hazards, this terminal will only be operated in a controlled area, which is confined to Boeing Property. The antenna beam will be directed into the target on the ground, or into the dirt hillside. During the experimental operation, the test area will be continuously monitored and controlled to prevent personnel entry into the hazard area. Additionally, the unit will be shut down prior to performing maintenance in any of the occupational hazard areas.

Environmental Assessment Boeing Proprietary Vertex 3.8 Meter Table 3 contains formulas, equations and parameters that were used in determining the Power Flux Density levels for Vertex 3.8 Meter: Data Type Data Data Formula Data Value Unit of Measure Symbol Power Input P Input 16 W Antenna Size D Input 3.8 M Antenna Area A A = (Π D 2 ) ÷ 4 11.34 M2 Subreflector Size Sub Input 12.4 cm Subreflector Area Asub Asub = (ΠSub 2 ) ÷ 4 120.76 cm2 Gain dBi Gdbi Input 53 dBi Gain Factor G G = 10Gdbi/10 199526.23 Gain Factor Frequency f Input 14250 MHz Wavelength λ 299.79 / f 0.021038 Meters Aperture Efficiency η η = [(Gλ 2 ) ÷ (4Π )] ÷ A 0.62 n/a Pi Π Input 3.14159 Numeric Constant M/Sec Input 299,792,458 Numeric Conversion W to mW mW mW = W × 1000 n/a n/a Conversion M to cm cm cm = M × 100 n/a n/a Conversion M2 to cm2 cm2 cm2 = M 2 × 10000 n/a n/a Conversion W/M2 to mW/cm2 mW/cm2 = W / M 2 ÷ 10 n/a n/a mW/cm2 Table 6 1. Far Field Analysis The distance to the far field can be calculated using the following formula: 0.6 D 2 R ff = = 411.82 Meters λ The power density in the far field can be calculated using the following formula. Note: this formula requires the use of power in milliwatts and far field distance in centimeters, or requires a post calculation conversion from W/M2: PG S ff = = 0.150 mW/cm2 4Π R ff 2

Environmental Assessment Boeing Proprietary 6. Near Field Analysis The extent of the Near Field region can be calculated using the following formula: D2 Rnf = = 171.59 Meters 4λ The power density of the near field can be calculated using the following formula. Note: this formula requires the use of power in milliwatts and diameter in centimeters, or requires a post calculation conversion from W/M2: 16ηP S nf = = 0.350 mW/cm2 Π D 2 7. Transition Region Analysis The transition region extends from the end of the near field out to the beginning of the far field. The power density in the transition region decreases inversely with distance from the antenna, while power density in the far-field decreases inversely with the square of the distance. However the power density in the transition region will not exceed the density in the near field, and can be calculated for any point in the transition region (R), using the following formula. Note: This formula requires the use of distance in centimeters, or requires a post calculation conversion from W/M2. S nf Rnf St = = 0.350 mW/cm2 R 8. Main Reflector Surface Area Analysis The maximum power density at the antenna surface area can be calculated using the following formula. Note: this formula requires the use of Power in milliwatts and Area in centimeters squared, or requires a post calculation conversion from W/M2. 4P S surface = = 0.564mW/cm2 A 9. Subreflector Area Analysis The area between the sub reflector and main reflector presents a potential hazard, with the highest density being located at the sub reflector area. The power density at the sub reflector can be calculated using the following formula. Note: this formula requires the

Environmental Assessment Boeing Proprietary use of Power in milliwatts and Area in centimeters squared, or requires a post calculation conversion from W/M2. 4P Subsurface = = 529.964 mW/cm2 Asub Tables 7 and 8 present a summary of the radiation hazard findings on the Vertex 3.8 Meter for both the General Population/Uncontrolled Area, as well as the Occupational/Controlled area environments. MPE Limits for General Population/Uncontrolled Area Area Range Meters Power Density Finding (mW/cm2) Far Field 411.82 0.150mW/cm2 Meets FCC Requirements Near Field 171.59 0.350 mW/cm2 Meets FCC Requirements Transition Region 171.59 – 411.82 0.350 mW/cm2 Meets FCC Requirements Main Reflector Surface N/A 0.564 mW/cm2 Potential Hazard Sub-reflector Surface N/A 529.964 mW/cm2 Meets FCC Requirements Table 7 MPE Limits for Occupational/Controlled Area Area Range Meters Power Density Finding (mW/cm2) Far Field 411.82 0.150mW/cm2 Meets FCC Requirements Near Field 171.59 0.350 mW/cm2 Meets FCC Requirements Transition Region 171.59 – 411.82 0.350 mW/cm2 Meets FCC Requirements Main Reflector Surface N/A 0.564 mW/cm2 Potential Hazard Sub-reflector Surface N/A 529.964 mW/cm2 Meets FCC Requirements Table 8 Based on the above finding there is a potential hazard of radio frequency exposure with use of the Vertex 3.8 Meter. In order to mitigate the risk of these hazards, this terminal

Environmental Assessment Boeing Proprietary will only be operated in a controlled area, which is confined to Boeing Property. The antenna beam will be directed into the target on the ground, or into the dirt hillside. During the experimental operation, the test area will be continuously monitored and controlled to prevent personnel entry into the hazard area. Additionally, the unit will be shut down prior to performing maintenance in any of the occupational hazard areas.


Document Created: 2010-10-14 13:06:41
Document Modified: 2010-10-14 13:06:41
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