Attachment Exhibit C

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


                                                 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.




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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




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

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