Attachment RadHaz

This document pretains to SES-RWL-20100830-01108 for Renewal on a Satellite Earth Station filing.

IBFS_SESRWL2010083001108_837156

Radiation Hazard Report                                                             Page 1 of 5


      Analysis of Non—lonizing Radiation for a 9.3-Méter Earth
                          Station System
This report analyzes the non—ionizing radiation levels for a 9.3—meter earth station system. The
analysis and calculations performed in this report 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. The radiation safety timits used in the analysis are in conformance with the FCC
R&O 96—326. Bulletin No. 65 and the FCC R&O specifies that there are two separate tiers of
exposure limits that are dependant on the situation in which the exposure takes place and/or the
status of the individuals who are subject to the exposure. The Maximum Permissible Exposure
{MPE) limits for persons in a General Population/Uncontrolied environment are shown in Table 1.
The General Population/Uncontrolled MPE is a function of transmit frequency and is for an
exposure period of thirty minutes or less. The MPE limits for persons in an
Occupational/Controlled environment are shown in Table 2. The Occupational MPE is a function of
transmit frequency and is for an exposure period of six minutes or less. The purpose of the
analysis described in this report is to determine the power flux density levels of the earth station in
the far—field, near—field, transition region, between the subreflector or feed and main reflector
surface, at the main reflector surface, and between the antenna edge and the ground and to
compare these levels to the specified MPEs.

               Table 1. Limits for General Population/Uncontrolled Exposure (MPE)
                  Frequency Range (MHz)          Power Density (mW/icm")
                             30—300                              0.2
                            300—1500               Frequency (MHz)®(0.8/1200)
                         1500—100,000                            1.0

                    Table 2. Limits for Occupational/Controlled Exposure (MPE)
                  Frequency Range (MHz)          Power Density (mW/icm")
                             30—300                              1.0
                            300—1500               Frequency (MHz)*(4.0/1200)
                         1500—100,000                            5.0

          Table 3. Formulas and Parameters Used for Determining Power Flux Densities

    Parameter                     Symbol            Formula                Value           Units
    Antenna Diameter                 D                Input                 9.3            m
    Antenna Surface Area           Asurface          1 D/ 4                67.93           m*
     Subreflector Diameter            Ds              Input                 110.0          ocm
    Area of Subreflector              Asr            x Ds /4              9503.32          om"
     Frequency                         F              Input                14250           MHz
    Wavelength                         A             300 /F              0.021053          m
    Transmit Power                     P              Input                750.00          W
    Antenna Gain (dBi)                Gee             Input                 61.0           dBi
    Antenna Gain (factor)              G             19Ce=">             1258925.4         n/a
     Pi                                x            Constant             3.1415927         n/a
    Antenna Efficiency                 n           GM(RD)                   0.65           n/a


Radiation Hazard Report                                                          Page 2 of 5



1.       Far Field Distance Calculation

The distance to the beginning of the far field can be determined from the following equation:

     Distance to the Far Field Region                       Ry =0.60 D/A                        (1)
                                                               = 2465.0 m

The maximum main beam power density in the far field can be determined from the following
equation:

     On—Axis Power Density in the Far Field                 S; =GP/(4 1 Ry")                    (2)
                                                               = 12.366 W/m*
                                                               = 1.237 mWicm*

2.      Near Field Calculation

Power flux density is considered to be at a maximum value throughout the entire length of the
defined Near Field region. The region is contained within a cylindrical volume having the same
diameter as the antenna. Past the boundary of the Near Field region, the power density from the
antenna decreases linearly with respect to increasing distance.

The distance to the end of the Near Field can be determined from the following equation:

     Extent of the Near Field                               Ry = D/ (4 2)                       (3)
                                                               = 1027.1 m

The maximum power density in the Near Field can be determined from the following equation:

     Near Field Power Density                               Sir = 16.0 1 P / (x D)              (4)
                                                                = 28.868 W/m*
                                                                = 2.887 mW/icm*

3.      Transition Region Calculation

The Transition region is located between the Near and Far Field regions. The power density
begins to decrease linearly with increasing distance in the Transition region. While the power
density decreases inversely with distance in the Transition region, the power density decreases
inversely with the square of the distance in the Far Field region. The maximum power density in
the Transition region will not exceed that calculated for the Near Field region. The power density
calculated in Section 1 is the highest power density the antenna can produce in any of the regions
away from the antenna. The power density at a distance R; can be determined from the following
equation:

     Transition Region Power Density                        S = Sy Rar/ Re                      (5)
                                                              = 2.887 mW/cm*


Radiation Hazard Report                                                           Page 3 of 5


4.      Region between the Main Reflector and the Subreflector

Transmissions from the feed assembly are directed     toward the subreflector surface, and are
reflected back toward the main reflector. The most    common feed assemblies are waveguide
flanges, horns or subreflectors. The energy between   the subreflector and the reflector surfaces
can be calculated by determining the power density    at the subreflector surface. This can be
determined from the following equation:

     Power Density at the Subreflector                    Ss = 4000 P / Ag                      (6)
                                                              = 315.679 mW/cm"

5.      Main Reflector Region

The power density in the main reflectoris determined in the same manner as the power density at
the subreflector. The area is now the area of the main reflector aperture and can be determined
from the following equation:

     Power Density at the Main Reflector Surface      Ssurtace = 4 P / Asurtace                 (7)
                                                              = 44.164 Wim"
                                                              = 4.416 mWi/icm*


6.      Region between the Main Reflector and the Ground

Assuming uniform illumination of the reflector surface, the power density between the antenna and
the ground can be determined from the following equation:

     Power Density between Reflector and Ground           Sy =P / Asuface                       (8)
                                                             = 11.041 W/im*
                                                             = 1.104 mW/icm*


Radiation Hazard Report                                                             Page 4 of 5


7.       Summary of Calculations

           Table 4. Summary of Expected Radiation levels for Uncontrolled Environment
                                             Calculated Maximum
                                        Radiation Power Density Level
Region                                                    (mW/icm?)               Hazard Assessment
1. Far Field (Ry = 2465.0 m)                        S¢           1.237              Potential   Hazard
2. Near Field (Ry= 1027.1 m)                        Sn           2.887              Potential   Hazard
3. Transition Region (Ry<R,< R;)                    S,           2.887              Potential   Hazard
4. Between        Main  Reflector and               Ss         315.679              Potential   Hazard
    Subreflector
5. Main Reflector                                   Ssurtace     4.416              Potential Hazard
6. Between Main Reflector and Ground                Sq           1.104              Potential Hazard

            Table 5. Summary of Expected Radiation levels for Controlled Environment
                                                Calculated Maximum
                                              Radiation Power Density
Region                                              Level (mW/icm*}               Hazard Assessment
1. Far Field (R§ = 2465.0 m)                        Sy         1.237               Satisfies FCC MPE
2. Near Field (Ry=1027.1 m)                         Sn        2.887                Satisfies FCC MPE
3. Transition Region (Ry < R, < Ry)                 S,           2.887            Satisfies FCC MPE
4. Between       Main   Reflector     and           Ssr        315.679              Potential Hazard
    Subreflector
5. Main Reflector                                   Ssurface     4.416            Satisfies FCC MPE
6. Between Main Reflector and Ground                S;           1.104            Satisfies FCC MPE

It is the applicant‘s responsibility to ensure that the public and operational personnel are not
exposed to harmful levels of radiation.


8.     Conclusions

Based on the above analysis it is concluded that the FCC MPE guidelines have been exceeded (or
met) in the regions of Table 4 and 5. The applicant proposes to comply with the MPE limits by one
or more of the following methods.

Means of Compliance Uncontrolled Areas

This antenna will be located in a fenced area. The fenced area will be sufficient to prohibit access
to the areas that exceed the MPE limits. The general public will not have access to areas within %
diameter removed from the edge of the antenna.

Since one diameter removed from the main beam of the antenna or % diameter removed from the
edge of the antenna reduces RF levels by a factor of 100 or 20 dB, none of the areas exceeding
the MPE limits will be accessible by the general public.

Radiation hazard signs will be posted while this earth station is in operation.


Radiation Hazard Report                                                        Page 5 of 5

The applicant will ensure that no buildings or other obstacles will be in the areas that exceed the
MPE limits.

Means of Compliance Controlled Areas

The earth station‘s operational personnel will not have access to the areas that exceed the MPE
limits while the earth station is in operation.

The transmitters will be turned off during antenna maintenance.


Radiation Hazard Report

      Analysis of Non—lonizing Radiation for a 4.5—Meter Earth
                          Station System
This report analyzes the non—ionizing radiation levels for a 4.5—meter earth station system. The
analysis and calculations performed in this report 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. The radiation safety limits used in the analysis are in conformance with the FCC
R&O 96—326. Bulletin No. 65 and the FCC R&O specifies that there are two separate tiers of
exposure limits that are dependant on the situation in which the exposure takes place and/or the
status of the individuals who are subject to the exposure. The Maximum Permissible Exposure
«{MPE) limits for persons in a General Population/Uncontrolled environment are shown in Table 1.
The General Population/Uncontrolied MPE is a function of transmit frequency and is for an
exposure period of thirty minutes or less. The MPE limits for persons in an
Occupational/Controlled environment are shown in Table 2. The Occupational MPE is a function of
transmit frequency and is for an exposure period of six minutes or less. The purpose of the
analysis described in this report is to determing the power flux density levels of the earth station in
the far—field, near—field, transition region, between the subreflector or feed and main reflector
surface, at the main reflector surface, and between the antenna edge and the ground and to
compare these levels to the specified MPEs.

                Table 1. Limits for General Population/Uncontrolled Exposure (MPE)
                   Frequency Range {MHz)         Power Density (mW/icm*)
                              30—300                             0.2
                             300—1500               Frequency (MHz)*(0.8/1200)
                          1500—100,000                           1.0

                    Table 2. Limits for Occupational/Controlied Exposure (MPE)
                  Frequency Range (MHz)          Power Density (mW/icm")
                             30—300                             1.0
                            300—1500                FErequency (MHz)*(4.0/1200)
                          1500—100,000                          5.0
          Table 3. Formulas and Parameters Used for Determining Power Flux Densities
     Parameter                    Symbot            Formula                Value          Units
     Antenna Diameter                D                Input                 4.5           m
     Antenna Surface Area          Asurtace          1 D"/ 4                15.90         m
     Subreflector Diameter             Dyr            Input                 61.0          m
     Area of Subreflector              Asr           x Ds /4              2922.47         cm*
     Frequency                          F             Input               14250           MHz
     Wavelength                         A            300/F               0.021053         m
     Transmit Power                     P             input               250.00          W
     Antenna Gain (dBi)                Ges            Input                54.9           dBi
     Antenna Gain (factor)              G            109C                309029.5         n/a
     Pi                                 x           Constant             3.1415927        n/a
     Antenna Efficiency                 n           Gr2(@D")                0.69          n/a


Radiation Hazard Report



1;      Far Field Distance Calculation

The distance to the beginning of the far field can be determined from the following equation:

     Distance to the Far Field Region                       Ry =0.60 D/A                        (1)
                                                                  =577.1 m

The maximum main beam power density in the far field can be determined from the following
equation:

     On—Axis Power Density in the Far Field                 Sr          GP/(4 1 Ry)             (2)




                                                                 11
                                                                        18.458 W/im*




                                                                 modl
                                                                        1.846 mW/cm*

2.      Near Field Calculation

Power flux density is considered to be at a maximum value throughout the entire length of the
defined Near Field region. The region is contained within a cylindrical volume having the same
diameter as the antenna. Past the boundary of the Near Field region, the power density from the
antenna decreases linearly with respect to increasing distance.

The distance to the end of the Near Field can be determined from the following equation:

     Extent of the Near Field                               Ry = D* / (4 A)                     (3)
                                                                  = 240.5 m

The maximum power density in the Near Field can be determined from the following equation:

     Near Field Power Density                               Sar = 16.0 1 P / (x D)              (4)
                                                                  = 43.090 W/im"
                                                                  = 4.309 mW/cm"

3.      Transition Region Calculation

The Transition region is located between the Near and Far Field regions. The power density
begins to decrease linearly with increasing distance in the Transition region. While the power
density decreases inversely with distance in the Transition region, the power density decreases
inversely with the square of the distance in the Far Field region. The maximum power density in
the Transition region will not exceed that calculated for the Near Field region. The power density
calculated in Section 1 is the highest power density the antenna can produce in any of the regions
away from the antenna. The power density at a distance R, can be determined from the following
equation:

     Transition Region Power Density                        S =SrRa/R                           (5)©
                                                              =4.309 mW/icm?*


Radiation Hazard Report


4.       Region between the Main Reflector and the Subreflector

Transmissions from the feed assembly are directed toward the subreflector surface, and are
reflected back toward the main reflector, The most common feed assemblies are waveguide
flanges, homs or subreflectors. The energy between the subreflector and the reflector surfaces
can be calculated by determining the power density at the subreflector surface.        This can be
determined from the following equation:

      Power Density at the Subreflector                   Ss, = 4000 P / Ag,                  (6)
                                                               =342.177 mWicm*

5.       Main Reflector Region

The power density in the main reflector is determined in the same manner as the power density at
the subreflector. The area is now the area of the main reflector aperture and can be determined
from the following equation:

      Power Density at the Main Reflector Surface     Ssurtace = 4 P / Asurtace               (7)
                                                               = 82.876 Wim"
                                                               = 6.288 mW/icm*


6.       Region between the Main Reflector and the Ground

Assuming uniform ilumination of the reflector surface, the power density between the antenna and
the ground can be determined from the following equation:

     . Power Density between Reflector and Ground         S             P 1 Asurtace          (8)
                                                              ll ll t




                                                                        15.719 Wim*
                                                                        1.572 mWicm*


 Radiation Hazard Report


 7.       Summary of Calculations

            Table 4. Summary of Expected Radiation levels for Uncontrolled Environment
                                                Calculated Maximum
                                           Radiation Power Density Level
 Region                                                  (mWIcmz)              Hazard Assessment
 1. Far Field (Rg = 577.1 m)                       S¢          1.846             Potential Hazard
 2. Near Field (R;y= 240.5 m)                      S            4.309            Potential Hazard
 3. Transition Region (Ry <R,< Ry)                 S;           4.309            Potential Hazard
 4. Between       Main   Refiector and             Ssr        342.177            Potential Hazard
     Subreflector
 5. Main Reflector                                 Ssurtace     6.288            Potential Hazard
 6. Between Main Reflector and Ground              Sq           1.572            Potential Hazard

             Table 5. Summary of Expected Radiation levels for Controlied Environment
                                             Calculated Maximum
                                           Radiation Power Density
 Region                                            Level (mWicm*)             Hazard Assessment
 1. Far Field (Ry = 577.1 m)                       Sz           1.846          Satisfies FCC MPE
 2. Near Field (Ry, = 240.5 m)                     Sre          4.309          Satisfies FCC MPE
 3. Transition Region (Ry < R; < R&)               S;           4.309          Satisfies FCC MPE
 4. Between       Main   Reflector   and           Sy         342.177           Potential Hazard
     Subreflector
 5. Main Reflector                                 Seurface     6.288           Potential Hazard
 6. Between Main Reflector and Ground              Sy           1.572          Satisfies FCC MPE

 It is the applicant‘s responsibility to ensure that the public and operational personnel are not
 exposed to harmful levels of radiation.



 8.     Conclusions

 Based on the above analysis it is concluded that the FCC MPE quidelines have been exceeded (or
 met) in the regions of Table 4 and 5. The applicant proposes to comply with the MPE limits by one
 or more of the following methods.


 Means of Compliance Uncontrolled Areas

 This antenna will be tocated in a fenced area. The fenced area will be sufficient to prohibit access
 to the areas that exceed the MPE limits. The general public will not have access to areas within 14
 diameter removed from the edge of the antenna.

 Since one diameter removed from the main beam of the antenna or %% diameter removed from the
—edge of the antenna reduces RF levels by a factor of 100 or 20 dB, none of the areas exceeding
 the MPE limits will be accessible by the general public.


Radiation Hazard Report

Radiation hazard signs will be posted while this earth station is in operation.

The applicant will ensure that no buildings or other obstacles will be in the areas that exceed the
MPE limits.                                                                                           i



Means of Compliance Controlled Areas


The earth station‘s operational personnel will not have access to the areas that exceed the MPE       |
limits while the earth station is in operation.
The transmitters will be turned off during antenna maintenance.




                                                                                                      |


Radiation Hazard Report

      Analysis of Non—lonizing Radiation for a 5.5—Meter Earth
                                           Station System

This report analyzes the nom—ionizing radiation levels for a 5.5—meter earth station system. The
analysis and calculations performed in this report 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. The radiation safety limits used in the analysis are in conformance with the FCC
R&O 96—326, Bulletin No. 65 and the FCC R&O specifies that there are two separate tiers of
exposure limits that are dependant on the situation in which the exposure takes place and/or the
status of the individuals who are subject to the exposure. The Maximum Permissible Exposure
{MPE) limits for persons in a General Population/Uncontrolled environment are shown in Table 1.
The General Population/Uncontrolled MPE is a function of transmit frequency and is for an
exposure period of thirty minutes or less. The MPE limits for persons in an
Occupational/Controlled environment are shown in Table 2. The Occupational MPE is a function of
transmit frequency and is for an exposure peried of six minutes or less. The purpose of the
analysis described in this report is to determing the power flux density levels of the earth station in
the far—field, near—fleld, transition region, between the subreflector or feed and main reflector
surface, at the main reflector surface, and between the antenna edge and the ground and to
compare these levels to the specified MPEs.

               Table 1. Limits for General Population/Uncontrolled Exposure (MPE)
                  Frequency Range (MHz)          Power Density (mW/icm")
                             30—300                                 0.2
                            300—1500                Frequency (MHz)*(0.8/1200)
                          1500—100,000                              1.0

                    Table 2. Limits for Occupational/Controlled Exposure (MPE)
                  Frequency Range (MHz)          Power Density (mW/cm*)
                             30—300                                 1.0
                            300—1500                Frequency (MHz)*(4.0/1200)
                          1500—100,000                              5.0

          Table 3. Formulas and Parameters Used for Determining Power Flux Densities
     Parameter                    Symbol            Formula                 Value          Units
     Antenna Diameter                D                Input                  5.5           m
     Antenna Surface Area          Asurtace          1D*/ 4                 23.76          m
     Subreflector Diameter            Dsr             Input                 88.9           cm
    Area of Subreflector              Asr            x D."/4               6207.17         cm"
    Frequency                          F              Input                 14250         MHz
    Wavelength                         A             300/F      .         0.021053        m
     Transmit Power                    P              Input                250.00         W
     Antenna Gain (dBi)               Gee             Input                 56.3          dBi
    Antenna Gain (factor)              G             10c°"°               426579.5        n/a
     Pi                                x            Constant              3.1415927       n/a
    Antenna Efficiency                 n           GNIGD)                   0.63          n/a


Radiation Hazard Report



1.       Far Field Distance Calculation

The distance to the beginning of the far field can be determined from the following equation:

      Distance to the Far Field Region                      R; =0.60D°/A                        (1)
                                                               = 862.1 m

The maximum main beam power density in the far field can be determined from the following
equation:

      On—Axis Power Density in the Far Field                S4; =GP/(4x Rfiz)                     (2)
                                                                = 11.418 W/im*
                                                                =1.142 mWi/cm*

2.       Near Field Calculation

Power flux density is considered to be at a maximum value throughout the entire length of the
defined Near Field region. The region is contained within a cylindrical volume having the same
diameter as the antenna. Past the boundary of the Near Field region, the power density from the
antenna decreases linearly with respect to increasing distance.

The distance to the end of the Near Field can be determined from the following equation:

      Extent of the Near Field                              Ra =D*/ (4 2)                        (3)
                                                               =359.2 m
The maximum power density in the Near Field can be determined from the following equation:

     . Near Field Power Density                             Sir = 16.0 1 P / (x D)              ©(4)
                                                                = 26.655 W/m*
                                                               =2,665 mW/cm"

3.       Transition Region Calculation

The Transition region is located between the Near and Far Field regions. The power density
begins to decrease linearly with increasing distance in the Transition region. While the power
density decreases inversely with distance in the Transition region, the power density decreases
inversely with the square of the distance in the Far Field region. The maximum power density in
the Transition region will not exceed that calculated for the Near Field region. The power density
calculated in Section 1 is the highest power density the antenna can produce in any of the regions
away from the antenna. The power density at a distance R, can be determined from the following
equation:

     Transition Region Power Density                        S = Sy Ru/R                         (5)
                                                               =2.665 mW/icm"


Radiation Hazard Report


4.       Region between the Main Reflector and the Subreflector

Transmissions from the feed assembly are directed     toward the subreflector surface, and are
reflected back toward the main reflector. The most    common feed assemblies are waveguide
flanges, horns or subreflectors. The energy between   the subreflector and the reflector surfaces
can be calculated by determining the power density    at the subreflector surface. This can be
determined from the following equation:

     Power Density at the Subreflector                    Ss; = 4000 P / As                 (8)
                                                              = 161.104 mW/icm*

5.       Main Reflector Region

The power density in the main reflectoris determined in the same manner as the power density at
the subreflector. The area is now the area of the main reflector aperture and can be determined
from the following equation:

     Power Density at the Main Reflector Surface      Seurtace =4 P / Asurtice              (7)
     >                                                        =42.091 W/im"
                                                              =4.209 mW/cm*


6.       Region between the Main Reflector and the Ground

Assuming uniform illumination of the reflector surface, the power density between the antenna and
the ground can be determined from the following equation:

     Power Density between Reflector and Ground           Sg =P / Asurtace                  (8)
                                                              = 10.523 W/im"
                                                              =1.052 mWicm*


Radiation Hazard Report


7.     Summary of Calculations

           Table 4. Summary of Expected Radiation levels for Uncontrolled Environment
                                                Calculated Maximum
                                           Radiation Power Density Level
Region                                                (mWiem‘)                Hazard Assessment
1. Far Field (Ry = 862.1 m)                       S¢        1.142               Potential Hazard
2. Near Field (Ry = 359.2 m)                      Sar       2.665               Potential Hazard
3. Transition Region (Ry < R; < Rg)               S,        2.665               Potential Hazard
4. Between        Main   Reflector  and           Ssr     161.104               Potential Hazard
    Subreflector
5. Main Reflector                                  Ssurface     4.209           Potential Hazard
6. Between Main Reflector and Ground               S            1.052           Potential Hazard

            Table 5. Summary of Expected Radiation levels for Controlled Environment
                                            Calculated Maximum
                                              Radiation Power Density
Region                                            Level (mW/icm*)            Hazard Assessment
1. Far Field (Ry = 862.1 m)                        S¢           1.142         Satisfies FCC MPE
2. Near Field (R,; = 359.2 m)                      Sn           2.665         Satisfies FCC MPE
3. Transition Region (Ry; < R, < R;)               S            2.665         Satisfies FCC MPE
4.  Between     Main  Reflector and                Ssr        161.104           Potential Hazard
    Subreflector
5. Main Reflector                                  Ssurface     4.209         Satisfies FCC MPE
6. Between Main Reflector and Ground               S,           1.052         Satisfies FCC MPE

It is the applicant‘s responsibility to ensure that the public and operational personnel are not
exposed to harmful levels of radiation.




8.     Conclusions

Based on the above analysis it is concluded that the FCC MPE guidelines have been exceeded (or
met) in the regions of Table 4 and 5. The applicant proposes to comply with the MPE limits by one
or more of the following methods.

Means of Compliance Uncontrolled Areas

This antenna will be located in a fenced area. The fenced area will be sufficient to prohibit access
to the areas that exceed the MPE limits. The general public will not have access to areas within %%
diameter removed from the edge of the antenna.

Since one diameter removed from the main beam of the antenna or %% diameter removed from the
edge of the antenna reduces RF levels by a factor of 100 or 20 dB, none of the areas exceeding
the MPE limits will be accessible by the general public.


Radiation Hazard Report
Radiatibn hazard signs will be posted while this earth station is in operation.

The applicant will ensure that no buildings or other obstacles will be in the areas that exceed the
MPE limits.

Means of Compliance Controlied Areas

The earth station‘s operational personnel will not have access to the areas that exceed the MPE
limits while the earth station is in operation.

The transmitters will be turned off during antenna maintenance.



Document Created: 2019-04-28 03:00:50
Document Modified: 2019-04-28 03:00:50

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