Attachment Exhibit C

This document pretains to SES-LIC-20140224-00098 for License on a Satellite Earth Station filing.

IBFS_SESLIC2014022400098_1035317

Exhibit C – Analysis of Non-Ionizing Radiation This report analyzes the non-ionizing radiation levels for the 1.0-meter and 0.65-meter earth stations included in this application. The analysis and calculations performed in this Annex 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. Bulletin No. 65 and the FCC R&O 96-326 specifies two Maximum Permissible Exposure (MPE) 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. These are described below: • General Population/Uncontrolled environment MPE limit is 1 mW/cm2. The General Population / Uncontrolled MPE is a function of transmit frequency and is for an exposure period of thirty minutes or less. • Occupational/Controlled environment MPE limit is 5 mW/cm2. The Occupational MPE is a function of transmit frequency and is for an exposure period of six minutes or less. The analysis provided in this report determined the power flux density levels of the earth station in the 1) far-field, 2) near-field, 3) transition region, 4) region between the feed and main reflector surface, 5) at the main reflector surface, and 6) between the antenna edge and the ground. Section A.1 – Calculations for the 1.0 m antenna Input Parameter Value Units Symbol Antenna Diameter 1 m D Antenna Transmit Gain 47.1 dBi G Transmit Frequency 30000 MHz F Antenna Feed Flange Diameter 6 Cm D Power Input to the Antenna 5 Watts P Calculated Parameter Value Units Symbol Formula Antenna Surface Area 0.7854 m² A πD²/4 Area of Antenna Flange 28.2735 cm² A πd²/4 Antenna Efficiency 0.5197 Real Η gλ²/(π²D²) Gain Factor 51286.1384 Real G 10^(G/10) Wavelength 0.0100 m Λ 300/f Antenna Field Distances Calculated Parameter Value Units Symbol Formula Near-Field Distance 25 m Rnf D²/(4λ) Distance to Far-Field 60 m Rff 0.6D²/λ Distance of Transition Range 25 m Rt Rt=Rnf

Power Density Calculated Parameter Value Units Symbol Formula Power Density in the Near Field 1.3234 mW/cm² Snf 16ηP/(πD²) Power Density in the Far Field 0.5669 mW/cm² Sff gP/(4πRff²) Power Density in the Transition Region 1.3234 mW/cm² St Snf*Rnf/Rt Power Density at the Feed Flange 707.3762 mW/cm² Sfa 4P/a Power Density at Main Reflector 2.5466 mW/cm² Ssurface 4P/A Power Density between Reflector and Ground 0.6366 mW/cm² Sg P/A Section A.2 – Calculations for the 0.65 m antenna Input Parameter Value Units Symbol Antenna Diameter 0.65 m D Antenna Transmit Gain 43.4 dBi G Transmit Frequency 30000 MHz f Antenna Feed Flange Diameter 6 cm d Power Input to the Antenna 5 Watts P Calculated Parameter Value Units Symbol Formula Antenna Surface Area 0.3318 m² A πD²/4 Area of Antenna Flange 28.2735 cm² a πd²/4 Antenna Efficiency 0.5247 real η gλ²/(π²D²) Gain Factor 21877.6162 real g 10^(G/10) Wavelength 0.0100 m λ 300/f Antenna Field Distances Calculated Parameter Value Units Symbol Formula Near-Field Distance 10.5625 m Rnf D²/(4λ) Distance to Far-Field 25.35 m Rff 0.6D²/λ Distance of Transition Range 10.5625 m Rt Rt=Rnf Power Flux Density Calculated Parameter Value Units Symbol Formula Power Density in the Near Field 3.1625 mW/cm² Snf 16ηP/(πD²) Power Density in the Far Field 1.3546 mW/cm² Sff gP/(4πRff²) Power Density in the Transition Region 3.1625 mW/cm² St Snf*Rnf/Rt Power Density at the Feed Flange 707.3762 mW/cm² Sfa 4P/a Power Density at Main Reflector 6.0273 mW/cm² Ssurface 4P/A Power Density between Reflector and Ground 1.5068 mW/cm² Sg P/A

Section A.3 – Summary of Results 1.0 m Antenna Region Calculated Limit Controlled Limit Uncontrolled Power Environment Environment Density ≤ 5 mW/cm2 ≤ 1 mW/cm2 (mW/cm2) Near Field 1.3234 meets limit exceeds limit Far Field 0.5669 meets limit meets limit Transition Region 1.3234 meets limit exceeds limit Feed Flange 707.3762 exceeds limit exceeds limit Main Reflector 2.5466 meets limit exceeds limit Between Reflector and Ground 0.6366 meets limit meets limit 0.65 m Antenna Region Calculated Limit Controlled Limit Uncontrolled Power Environment Environment Density ≤ 5 mW/cm2 ≤ 1 mW/cm2 (mW/cm2) Near Field 3.1625 meets limit exceeds limit Far Field 1.3546 meets limit exceeds limit Transition Region 3.1625 meets limit exceeds limit Feed Flange 707.3762 exceeds limit exceeds limit Main Reflector 6.0273 exceeds limit exceeds limit Between Reflector and Ground 1.5068 meets limit exceeds limit As summarized in the above tables the 1.0 m and 0.65 m antennas meet the FCC’s MPE levels for controlled environments except for at the feed flange for both antennas as well as at the main reflector for 0.65 m antenna. Since the antennas will be enclosed within a radome, these areas will not be accessible while the antennas are in operation. Training of personnel with access to the antenna would include consideration of the operation mode of the antenna and information on how to prevent radiation exposure, including disabling the communications system. When maintenance of the antenna is required and the radome is removed, the trained technicians will turn off the transmit power before performing work in these areas. In addition, the antennas will be installed at an elevation that is not accessible by the general population on the vessels, and any areas where the limits for uncontrolled environments could be exceeded will be restricted to trained personnel. Therefore, the general population will be protected. In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in § 1.1310 of the Regulations. Moreover, the applicant agrees to take all necessary measures to ensure that the antenna does not create potential exposure of humans to radiofrequency radiation in excess of the FCC exposure limits


Document Created: 2014-02-14 13:54:41
Document Modified: 2014-02-14 13:54:41
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC