Attachment Exhibit C

This document pretains to SES-MOD-20171010-01126 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017101001126_1278607

Exhibit C

Exhibit C – Analysis of Non-Ionizing Radiation 1.0 Analysis for the KA30 earth station. 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 specify 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 1 – Calculations for KA30 Input Parameter Value Units Antenna Diameter 0.3048 m Antenna Transmit Gain 37.43 dBi Transmit Frequency 30000 MHz Antenna Feed Flange Diameter 1.07 cm Power Input to the Antenna 8.2 Watts Calculated Parameter Value Units Antenna Surface Area 0.0730 m² Area of Antenna Flange 0.8992 cm² Antenna Efficiency 0.6035 real Gain Factor 5533.5011 real Wavelength 0.0100 m Calculated Parameter Value Units Near-Field Distance 2.322576 m Distance to Far-Field 5.5741824 m Distance of Transition Range 2.322576 m

Calculated Parameter Value Units Power Density in the Near Field 27.1308 mW/cm² Power Density in the Far Field 11.6213 mW/cm² Power Density in the Transition Region 27.1308 mW/cm² Power Density at the Feed Flange 36477.8485 mW/cm² Power Density at Main Reflector 44.9538 mW/cm² Power Density between Reflector and Ground 11.2385 mW/cm² Distance to 1 mW/cm² Power Density 19 m Distance to 5 mW/cm² Power Density 8.5 m Section A.2 – Summary of Results Region Distance Calculated Limit Limit Uncontrolled (m) Power Controlled Environment Density Environment ≤ 1 mW/cm2 (mW/cm2 ) ≤ 5 mW/cm2 Safe Range for ≥ 19 meets limit meets limit Uncontrolled 1.0 Safe Range for ≥ 8.5 meets limit exceeds limit Controlled 5.0 Near Field 2.3 29.1 exceeds limit exceeds limit Far Field 5.6 11.6 exceeds limit exceeds limit Transition Region 2.3 27.1 exceeds limit exceeds limit Feed Flange N/A 36478 exceeds limit exceeds limit Main Reflector N/A 45 exceeds limit exceeds limit The KA30 terminals proposed in this application are for commercial and government uses on aircraft and intended to be operated only by professional personnel. As summarized in the above table the KA30 antenna does not meet the FCC’s MPE levels for controlled or uncontrolled environments until separation distances of 19 m and 8.5 m respectively. However, given that the antenna will not operate below elevation angles of five degrees, that its mounting location on the fuselage of the aircraft, that is approximately ten meters above the ground and that the terminal will be pointed upward toward the satellite - persons on the ground near the aircraft are unlikely to be exposed to the main beam of the antenna. As with any directional antenna the maximum level of non-ionizing radiation is in the main beam of the antenna that is pointed to the satellite, therefore the levels of power density will be significantly reduced from those calculated. In addition, the antenna will be enclosed within a radome during operation. Therefore, the feed flange and main reflector, where the levels are highest, will not be physically accessible. When maintenance of the antenna is required, the trained technicians will turn off the transmit power before removing the radome and performing maintenance activities. Training of personnel with access to the antenna will include consideration of the operation mode of the antenna and information on how to prevent radiation exposure, including disabling the communications system. In conclusion, the results show that the KA30 antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in § 1.1310 of the Regulations.


Document Created: 2017-09-19 15:57:04
Document Modified: 2017-09-19 15:57:04
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