Attachment Exhibit 1

This document pretains to SES-LIC-20100420-00460 for License on a Satellite Earth Station filing.

IBFS_SESLIC2010042000460_811542

SCHLUMBERGER TECHNOLOGY CORPORATION Q. 28, Form 312 Page 1 of 4 EXHIBIT 1 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 are in compliance 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 FCC R&O 96—326. Bulletin No. 65 and FCC R&O 96—236 each specifies that there are two (2) separate tiers of exposure limits that are dependent 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 below. The General Population/ Uncontrolled MPE is a function of transmit frequency and is for an exposure period of 30 minutes or less. The MPE limits for persons in an Occupational/Controlled environment are shown in Table 2 below. The Occupational MPE is a function of transmit frequency and is for an exposure period of six (6) 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 (MH;) Power Density (mWatts/em**2) 30—300 0.2 300—1 500 Frequency ((MH;) *(0.8/1200) 1500 — 100,000 1.0 Table 2. Limits for Occupational/Controlled Exposure (MPE) Frequency Range (MH;) Power Density (mWatts/ecm**2) 30—300 1.0 300—1 500 Frequency (MH;) *(4.0/1200) 1500 — 100,000 5.0 Table 3 contains the parameters that are used to calculate the various power densities for the . earth stations. DALLAS 1704842v1

SCHLUMBERGER TECHNOLOGY CORPORATION Q. 28, Form 312 Page 2 of 4 Table 3. Formulas and Parameters Used for Determining Power Flux Densities Parameter Abbreviation Value Units Antenna Diameter ' D 1.2 meters Antenna Surface Area Sa II * D**2/4 meters**2 Subreflector Diameter Ds 19.0 cm Area of Subreflector As II * Ds**2/4 cm**2 Frequency Frequency 14250 MHz Wavelength lambda 300/frequency (MH;z) meters Transmit Power P 4.00 Watts Antenna Gain Ges 43.0 dBi Pi II 3.1415927 n/a Antenna Efficiency n 0.62 n/a 1. Far Field Distance Calculation The distance to the beginning of the far field can be determined from the following equation: (1) Distance to the Far Field Region, (Rf) = 0.60 * D**2 / lambda (1) = 41.0 meters The maximum main beam power density in the Far Field can be determined from the following equation: (2) On—Axis Power Density in the Far Field, (Wf) = Ges * P /4 * II * / Rf**2 (2) = 3.771 Watts/meters**2 0.377 mWatts/em**2 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: (3) Extent of the Near Field, (Rn) =D**2 / (4 * lambda) (3) =17.1 meters The maximum power density in the Near Field can be determined from the following equation: (4) Near Field Power Density, (Wo)= 16.0 * n * P / II * D**2 (4) = 8.803 Watts/meters**2 = 0.880 mWatts/cm**2 DALLAS 1704842v1

SCHLUMBERGER TECHNOLOGY CORPORATION Q. 28, Form 312 Page 3 of 4 3. Transition Region Calculations The Transition region is located between the Near and Far Field regions. As stated in Section 2 above, 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 above is the highest power density that the antenna can produce in any of the regions away from the antenna. The power density at a distance Rt can be determined from the following equation: (5) Transition region Power Density, (Tt)= Wnn * Rn / Rt (5) 4, Region between Main Reflector and 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 calculation can be determined from the following equation: (6) Power Density at Feed Flange, (Ws) = 4 * P / As (6) = 56.432 mWatts/ecm**2 5. Main Reflector Region The power density in the main reflector is determined in the same manner as the power density at the subreflector, in Section 4 above, but the area is now the area of the main reflector aperture and can be determined from the following equation: (7) Power Density at the Main Reflector Surface, (Wm)= 4 * P / Sa (7) = 14.147 Watts/meters**2 1.415 mWatts/ecm**2 6. Region between Main Reflector and Ground Assuming uniform illumination of the reflector surface, the power density between the antenna and ground can be determined from the following equation: (8) Power Density between Reflector and Ground, (Wg) = P / Sa (8) = 3.537 Watts/meters**2 = 0.354 mWatts/cm**2 DALLAS 1704842v1

SCHLUMBERGER TECHNOLOGY CORPORATION Q. 28, Form 312 Page 4 of 4 Table 4. Summary of Expected Radiation levels for Uncontrolled Environment Calculated Maximum Radiation Region Power Density Level (mWatts/ecm**2) Hazard Assessment 1. Far Field (Rf) = 41.0 meters 0.377 Satisfies FCC MPE 2. Near Field (Rn) = 17.1 meters 0.880 Satisfies FCC MPE 3. Transition Region 0.880 Rn <Rt< Rf, (Rt) Satisfies FCC MPE 4. Between Main Reflector 56.432 Potential Hazard and Subreflector 5. Main Reflector 1.415 | Potential Hazard 6. Between Main Reflector 0.354 Satisfies FCC MPE and Ground Table 5. Summary of Expected Radiation levels for Controlled Environment Calculated Maximum Radiation Region Power Density Level (mWatts/cm**2) Hazard Assessment 1. Far Field (Rf) =41.0 meters 0.377 Satisfies FCC MPE 2. Near Field (Rn) = 17.1 meters 0.880 Satisfies FCC MPE 3. Transition Region Rn < Rt, < Rf, (Rt) 0.$80 Satisfies FCC MPE 4. Between Main Reflector 56.432 Potential Hazard and Subreflector 5. Main Reflector 1.415 Satisfies FCC MPE 6. Between Main Reflector 0.354 Satisfies FCC MPE and Ground It is the responsibility of Schlumberger Technology Corporation to ensure that public and operational personnel are not exposed to harmful levels of radiation. DALLAS 1704842v1


Document Created: 2019-04-18 21:48:10
Document Modified: 2019-04-18 21:48:10
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC