Attachment Exhibit C

This document pretains to SES-MOD-20160720-00669 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2016072000669_1143955

ISAT US Inc. FCC Form 312 Exhibit C Radiation Hazard Analysis 1.0 Introduction This Exhibit analyzes the non-ionizing radiation levels for the QCT90 GX and CCT120 GX 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 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 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. The summary of results and discussion is provided in Section 2 and the detailed analyses is provided in Section 3. Section 2.0 – Summary of Results The terminals proposed in this application are for commercial and government uses and intended to be operated by professional personnel. The analysis of the non-ionizing radiation levels, for each of the terminals, provided in Section 3 assumed the maximum allowed input power to antenna of 5W 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 5W 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. The terminals proposed in this application 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 and will not resume operating until the signal from the satellite is reacquired. This operational feature of the terminal minimizes the potential for human radiation exposure. The terminals will be turned off prior to any maintenance being conducted when a person may need to be in close proximity to the feed flange and main reflector.

The Table below summarize the result for the proposed terminals. QCT90 GX Limit Controlled Calculated Environment Limit Uncontrolled Distance Region (m) Power Density ≤ 5 mW/cm2 Environment (mW/cm2) ≤ 1 mW/cm2 Near Field 14.1 2.4 Meets Limit Exceeds Limit Far Field 33.8 1.0 Meets Limit Meets Limit Transition Region 14.1 2.4 Meets Limit Exceeds Limit Feed Flange NA 873.3 Exceeds Limit Exceeds Limit Main Reflector NA 4.5 Meets Limit Exceeds Limit CCT120 GX Limit Controlled Calculated Environment Limit Uncontrolled Distance Region (m) Power Density ≤ 5 mW/cm2 Environment (mW/cm2) ≤ 1 mW/cm2 Near Field 25 1.5 Meets Limit Exceeds Limit Far Field 60 0.6 Meets Limit Meets Limit Transition Region 25 1.5 Meets Limit Exceeds Limit Feed Flange NA 1640.4 Exceeds Limit Exceeds Limit Main Reflector NA 3.2 Meets Limit Exceeds Limit As shown the antenna terminals meet the controlled environment limit of ≤ 5 mW/cm except at the feed flange. The feed flange is a very small area of the terminal antenna and it is extremely unlikely that a person would be near the feed flange or the main reflector while the terminal is in operation. Any blockage of the signal from the satellite in these areas would cause the terminal to cease transmitting until the blockage is removed and the signal from the satellite is reacquired. Also, in a controlled environment technicians are trained and procedures are put in place to ensure that a safe distance is maintained from the antenna while in operation. The terminals when operating with maximum input power and a 100% duty cycle varies in meeting the uncontrolled environment limit of ≤ 1 mW/cm2. As described above the maximum radiation levels occur in a limited area in the direction the antenna is pointed to and the automatic shut off capability of the terminal when the satellite receive signal is blocked will reduce potential human exposure. In addition, the terminal proposed in this application are for commercial and government use and, given the price points, are not intended to be used by consumers or widely deployed for use by the general public. Personnel operating these terminals will be trained in how to operate the terminal safely. Furthermore, the manuals for these terminals will explicitly indicate that precautions, such has not standing in front of the terminal, that are necessary to limit potential exposure.

Section 3.0 – Detailed calculations 3.1 QCT90 GX Terminal Input Parameter Value Units Symbol Antenna Diameter 0.75 m D Antenna Transmit Gain 44.6 dBi G Transmit Frequency 30000 MHz f Antenna Feed Flange Diameter 5.4 cm d Power Input to the Antenna 5 Watts P Calculated Parameter Value Units Symbol Formula Antenna Surface Area 0.4418 m² A πD²/4 Area of Antenna Flange 22.9015 cm² a πd²/4 Antenna Efficiency 0.5195 real η gλ²/(π²D²) Gain Factor 28840.3150 real g 10^(G/10) Wavelength 0.0100 m λ 300/f Calculated Parameter Value Units Symbol Formula Near-Field Distance 14.0625 m Rnf D²/(4λ) Distance to Far-Field 33.75 m Rff 0.6D²/λ Distance of Transition Range 14.0625 m Rt Rt=Rnf Calculated Parameter Value Units Symbol Formula Power Density in the Near Field 2.3520 mW/cm² Snf 16ηP/(πD²) Power Density in the Far Field 1.0075 mW/cm² Sff gP/(4πRff²) Power Density in the Transition Region 2.3520 mW/cm² St Snf*Rnf/Rt Calculated Parameter Value Units Symbol Formula Power Density at the Feed Flange 873.3039 mW/cm² Sfa 4P/a Calculated Parameter Value Units Symbol Formula Power Density at Main Reflector 4.5272 mW/cm² Ssurface 4P/A Calculated Parameter Value Units Symbol Formula Power Density between Reflector and Ground 1.1318 mW/cm² Sg P/A

3.2 CCT120 GX Terminal Input Parameter Value Units Symbol Antenna Diameter 1 m D Antenna Transmit Gain 47.6 dBi G Transmit Frequency 30000 MHz f Antenna Feed Flange Diameter 5.4 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 22.9015 cm² a πd²/4 Antenna Efficiency 0.5831 real η gλ²/(π²D²) Gain Factor 57543.9937 real g 10^(G/10) Wavelength 0.0100 m λ 300/f 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 Calculated Parameter Value Units Symbol Formula Power Density in the Near Field 1.4848 mW/cm² Snf 16ηP/(πD²) Power Density in the Far Field 0.6360 mW/cm² Sff gP/(4πRff²) Power Density in the Transition Region 1.4848 mW/cm² St Snf*Rnf/Rt Calculated Parameter Value Units Symbol Formula Power Density at the Feed Flange 873.3039 mW/cm² Sfa 4P/a Calculated Parameter Value Units Symbol Formula Power Density at Main Reflector 2.5466 mW/cm² Ssurface 4P/A Calculated Parameter Value Units Symbol Formula Power Density between Reflector and Ground 0.6366 mW/cm² Sg P/A


Document Created: 2016-07-20 13:09:57
Document Modified: 2016-07-20 13:09:57
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC