Attachment Description

This document pretains to SES-STA-20100401-00383 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2010040100383_808774

Special Temporary Authority for VSAT Terminal Operations, 30 Day Extension of SES-STA-20100324-00351 04/01/2010 Submitted by Ronald E Center The Boeing Company Frequency Management Services MC: 2T-22 P.O. Box 3707 Seattle, WA 98124-2207 206-544-6044 Office 866-248-1493 Toll Free This is request for an extension of the Special Temporary Authority SES-STA- 20100324-00351, and Boeing requests a start date of April 22, 2010 to allow for uninterrupted operation for an additional 30 days in support of this temporary communications requirement. This STA extension supports temporary use of a C-band satellite terminal using leased satellite service from a U.S. licensed provider, via satellite Galaxy-13/Horizon-1. The earth terminal to be used is a Prodelin 2.4 Meter dish, Model 1244. The system will be operated from Milford, OH. The specifications of the operation are listed below. The RadHaz study is provided following the technical data. General Information: Site Location: 39-10-53.8N; 84-17-2.4W, NAD 83 Ground Elevation AMSL: 176.1 Meters Satellites: Galaxy-13/Horizon-1, located at 127 Degrees West Period: April 22, 2010 through May 22, 2010.

Special Temporary Authority for VSAT Terminal Operations, 30 Day Extension of SES-STA-20100324-00351 Antenna Data Quantity: 1 Antenna Manufacturer: Prodelin Model: 1244 Antenna Size: 2.4 Meters Antenna Transmit Gain: 42 dBi at 6137.5 MHz Antenna Receive Gain: 38 dBi at 3912.5 MHz Antenna Power Limits Antenna Height Above Ground Level: 3 Meters Antenna Height Above Sea Level: 179.1 Meters Building Height: N/A – Antenna operated at ground level. Total Input Power at Antenna Flange: 6.4 Watts Antenna Height Above Rooftop: N/A Total EIRP for all Carriers: 50.06 dBW Frequency Limits Satellite Arc, Eastern Limit: 127 Degrees West Satellite Arc, Western Limit: 127 Degrees West Antenna Elevation Angle, Eastern Limit: 27 Degrees Antenna Elevation Angle, Western Limit: 27 Degrees Earth Station Azimuth Limit, Eastern Limit: 235.6 Degrees True Earth Station Azimuth Limit, Western Limit: 235.6 Degrees True Maximum EIRP density towards the Horizon (dBW/4KHz): -23.77 dBW/4KHz

Special Temporary Authority for VSAT Terminal Operations, 30 Day Extension of SES-STA-20100324-00351 Particulars of Operation Frequency Band of Operation: Transmit: 5927 - 5963 MHz Receive: 3700 - 4200 MHz Antenna Polarization: Linear Band MHz T/R Mode Emission Max EIRP dBW Max EIRP Density dBW/4KHz 3700 - 4200 R 1M28G7D 0 0 5927 - 5963 T 1M28G7D 50.06 dBW 25.01 dBW/4KHz

3/30/2010 Page 1 Analysis of Non-Ionizing Radiation for a 2.4M Prodelin 1244 This report presents an analysis of the non-ionizing radiation levels for a 2.4M Prodelin 1244 system. 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. 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

3/30/2010 Page 2 2.4M Prodelin 1244 Table 3 contains formulas, equations and parameters that were used in determining the Power Flux Density levels for the 2.4M Prodelin 1244: Data Type Data Data Formula Data Value Unit of Symbol Measure Power Input P Input 6.4 W Antenna Size D Input 2.4 M Antenna Area A A = (Π D 2 ) ÷ 4 4.52 M2 Subreflector Size Sub Input 12.7 cm Subreflector Area Asub Asub = (ΠSub 2 ) ÷ 4 126.68 cm2 Gain dBi Gdbi Input 42 dBi Gain Factor G G = 10Gdbi/10 15848.93 Gain Factor Frequency f Input 6175 MHz Wavelength λ 299.79 / f 0.048549 Meters Aperture Efficiency η η = [(Gλ 2 ) ÷ (4Π )] ÷ A .66 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 3 1. Far Field Analysis The distance to the far field can be calculated using the following formula: 0.6 D 2 R ff = = 71.19 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 = = 0.159 mW/cm2 4Π R ff 2

3/30/2010 Page 3 2. Near Field Analysis The extent of the Near Field region can be calculated using the following formula: D2 Rnf = = 29.66 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 = = 0.373 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 = = 0.373 mW/cm2 R 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 = = 0.566 mW/cm2 A

3/30/2010 Page 4 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 = = 202.084 mW/cm2 Asub 6. Power Density between Reflector and Ground Analysis The power density between the reflector and the ground 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. P S ground = = 0.142 mW/cm2 A Tables 4 and 5 present a summary of the radiation hazard findings on the 2.4M Prodelin 1244 terminal 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 71.19 0.159 mW/cm2 Meets FCC Requirement Near Field 29.66 0.373 mW/cm2 Meets FCC Requirement Transition Region 29.66 – 71.19 0.373 mW/cm2 Meets FCC Requirement Main Reflector Surface N/A 0.566 mW/cm2 Meets FCC Requirement Sub-reflector Surface N/A 202.084 mW/cm2 Potential Hazard Area between Reflector N/A 0.142 mW/cm2 Meets FCC and Ground Requirement Table 4

3/30/2010 Page 5 MPE Limits for Occupational/Controlled Area Area Range Meters Power Density Finding (mW/cm2) Far Field 71.19 0.159 mW/cm2 Meets FCC Requirement Near Field 29.66 0.373 mW/cm2 Meets FCC Requirement Transition Region 29.66 – 71.19 0.373 mW/cm2 Meets FCC Requirement Main Reflector Surface N/A 0.566 mW/cm2 Meets FCC Requirement Sub-reflector Surface N/A 202.084 mW/cm2 Potential Hazard Area between Reflector N/A 0.142 mW/cm2 Meets FCC and Ground Requirement Table 5 Based on the above finding there is a potential hazard of radio frequency exposure with use of the 2.4M Prodelin 1244. In order to mitigate the risk of these hazards, this terminal will only be operated in a controlled area. Additionally, the unit will be shut down prior to performing maintenance in any of the occupational hazard areas.


Document Created: 2010-04-01 08:15:54
Document Modified: 2010-04-01 08:15:54
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC