Attachment Exhibit C

This document pretains to SES-MOD-INTR2019-01474 for Modification on a Satellite Earth Station filing.

IBFS_SESMODINTR201901474_1680821

ISAT US Inc. FCC Form 312 Exhibit C L3 GCS Panther II 60 and Panther II 96 Radiation Hazard Analysis I. Introduction This Exhibit analyzes the non-ionizing radiation levels for the two L3 GCS Panther II terminal earth stations included in this application. The analysis and calculations performed in this Exhibit 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 determined the power flux density levels of the earth station in the 1) far-field, 2) near- field, and 3) transition region. The analysis also examined the safe distance required to meet both the controlled and uncontrolled exposure limits. The summary of results and discussion is provided in Section 2 and the detailed analyses are provided in Section 3. II. Summary of Results The Tables below summarize the results for the proposed Panther II terminals. The analysis of the non- ionizing radiation levels, provided in Section 3, assumed the maximum allowed input power to antenna of 7W and a 100% duty cycle resulting in worst case radiation levels. In a significant number of deployments, the terminal duty cycle would be below 100% and the actual power required would be lower than the 7W maximum resulting in lower radiation levels than those calculated. 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. As one moves around the antenna to the side lobes and back lobes the radiation levels decrease significantly. Thus, the maximum radiation level from an antenna occurs in a limited area in the direction the antenna is pointed to. This is especially true in the case of the Panther II terminals, as they utilize small, dish antennas that result in a very narrow main beam, resulting in higher calculated power density in the main beam but a sharp drop off in energy as one moves toward the side lobes. The Panther II terminals are for commercial and government use and are not intended to be operated by the general public. The terminal is cost prohibitive for purchase by the general public, therefore it will only be operated by trained professional personnel. The antenna installers will be aware of the antenna’s radiation environment and use measures best suited to maximize protection to anyone who may come into the proximity of the terminal.

As summarized in the tables below, the Panther II 60 terminal meets the FCC’s MPE levels for uncontrolled or controlled environments beyond separation distances of about 34.16 m and 15.28 m, respectively. The Panther II 96 terminal meets the FCC’s MPE levels for uncontrolled or controlled environments beyond separation distances of about 57.02 m and 25.50 m, respectively. Based on these calculations, the Panther II 60 meets the FCC’s MPE level for controlled environments in the far field and slightly exceeds the level for controlled environments in the near field and transition region of the antenna. The Panther II 60 exceeds the MPE levels for uncontrolled environments in the near field, far field and the transition region of the antenna. The Panther II 96 meets the FCC’s MPE levels for controlled environments in the near field, far field, and transition region. The Panther II 96 only slightly exceeds the MPE levels for uncontrolled environments in the far field region and exceeds the MPE levels for uncontrolled environments in the near field and transition regions. Training of personnel with access to the terminal would include consideration of the operational modes of the antenna and information on how to prevent radiation exposure, including disabling the communications system. Additionally, there are various safety features associated with the operation and installation of the terminals that will prevent radiation exposure. For example, the terminals are designed to cease transmitting if the receive signal from the satellite is blocked, which could be caused by a person standing in front of the terminal or from other blockage. If the receive signal is blocked, the transmitter is shut down nearly instantaneously and will not resume operating until the signal from the satellite is reacquired. In fact there is a double shut down protection in the event that someone or something obstructs the RF path to the satellite. Not only does the terminal automatically turn off its Transmit capability if it loses the satellite Receive signal, i.e. the transmission path is compromised, but the radio frequency amplifier is additionally muted via its monitor and control so that no radio frequency can be transmitted. Especially given the small size of these antennas and their operational elevation angle, there is a high probability that any person passing close enough to the antenna to be exposed to its main beam would also block the RF path between the terminal and the satellite triggering the automatic shutdown mechanism. As a result of this automatic shutdown mechanism, the maximum continuous time that a person could be exposed to the main beam transmissions at any power level would be significantly less than one second before the antenna would cease transmitting. The antenna will be operated only at locations not accessible by the general population. Given that the antenna will not operate below elevation angles of five degrees, and that the terminal will be pointed upward toward the satellite - persons are unlikely to be exposed to the main beam of the antenna. Any areas where the limits for uncontrolled environments could be exceeded will be restricted to trained personnel. Furthermore, the manuals for these terminals will provide warnings regarding potential for radiation hazard. In conclusion, the results of the analysis combined with the design and operational characteristics of the terminals show that the Panther II terminals, when deployed, and used under the proper mitigation procedures, meet the guidelines specified in § 1.1310 of the Regulations. 2

Panther II 60 Terminal Calculated Limit Controlled Limit Uncontrolled Power Region Distance (m) Environment Environment Density ≤ 5 mW/cm2 ≤ 1 mW/cm2 (mW/cm2) Safe Range for ≥34.16 1.0 Meets Limit Meets Limit Uncontrolled Safe Range for ≥15.28 5.0 Meets Limit Exceeds Limit Controlled Near Field 9.00 5.84 Exceeds Limit Exceeds Limit Far Field 21.60 2.5 Meets Limit Exceeds Limit Transition Region 9.00 5.84 Exceeds Limit Exceeds Limit Panther II 96 Terminal Calculated Limit Controlled Limit Uncontrolled Power Region Distance (m) Environment Environment Density ≤ 5 mW/cm2 ≤ 1 mW/cm2 (mW/cm2) Safe Range for 1.0 Meets Limit Meets Limit Uncontrolled ≥57.02 Safe Range for 5.0 Meets Limit Exceeds Limit Controlled ≥25.50 Near Field 23.04 2.48 Meets Limit Exceeds Limit Far Field 55.3 1.06 Meets Limit Exceeds Limit Transition Region 23.04 2.48 Meets Limit Exceeds Limit III. Detailed Calculations Panther II 60 Terminal Input Parameter Value Units Symbol Antenna Diameter 0.6 m D Antenna Transmit Gain 43.21 dBi G Transmit Frequency 30000 MHz f Power Input to the Antenna 7 Watts P Calculated Parameter Value Units Symbol Formula Antenna Efficiency 0.59 real η gλ²/(π²D²) Gain Factor 20941.12 real g 10^(G/10) Wavelength 0.01 m λ 300/f 3

Antenna Field Distancs Calculated Parameter Value Units Symbol Formula Near-Field Distance 9.00 m Rnf D²/(4λ) Distance to Far-Field 21.60 m Rff 0.6D²/λ Distance of Transition Range 9.00 m Rt Rt=Rnf Power Flux Density Calculated Parameter Value Units Symbol Formula Power Density in the Near Field 5.84 mW/cm² Snf 16ηP/(πD²) Power Density in the Far Field 2.50 mW/cm² Sff gP/(4πRff²) Power Density in the Transition Region 5.84 mW/cm² St Snf*Rnf/Rt Panther II 96 Terminal Input Parameter Value Units Symbol Antenna Diameter 0.96 m D Antenna Transmit Gain 47.66 dBi G Transmit Frequency 30000 MHz f Power Input to the Antenna 7 Watts P Calculated Parameter Value Units Symbol Formula Antenna Efficiency 0.64 real η gλ²/(π²D²) Gain Factor 58344.51 real g 10^(G/10) Wavelength 0.01 m λ 300/f Antenna Field Distances Calculated Parameter Value Units Symbol Formula Near-Field Distance 23.04 m Rnf D²/(4λ) Distance to Far-Field 55.30 m Rff 0.6D²/λ Distance of Transition Range 23.04 m Rt Rt=Rnf Power Flux Density Calculated Parameter Value Units Symbol Formula Power Density in the Near Field 2.48 mW/cm² Snf 16ηP/(πD²) Power Density in the Far Field 1.06 mW/cm² Sff gP/(4πRff²) Power Density in the Transition Region 2.48 mW/cm² St Snf*Rnf/Rt 4


Document Created: 2010-01-01 00:00:00
Document Modified: 2010-01-01 00:00:00
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