Attachment Exhibit B

This document pretains to SES-LIC-20110627-00745 for License on a Satellite Earth Station filing.

IBFS_SESLIC2011062700745_899837

                                                                                            EXHIBIT B



Radiation Hazard Report                                                                      Page 1 of 5

      Analysis of Non—lonizing Radiation for a 3.8—Meter Earth
                          Station System
This report analyzes the non—lonizing radiation levels for a 8.8—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. 85 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 tlers 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 envirenment are shown in Table 1.
The General Population/Unconirolled 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/Contralled 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 Denslty (mWicm")
                           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/iem")
                           30—300                                  1.0
                          300—1500                      Frequency (MHz)*(4.0/1200)
                        1500—100,000                               5.0

           Table 3. Formulas and Paramaters Used for Determining Power Flux Densities
     Parameter                       Symbol              Formula                 Value              Units
     Antenna Diameter                   D                  Input                  3.8               m
     Antenna Surface Area             Asurtace            x D*/ 4                11.34              m
     FEsed Flangs Diameter              Dr                    Inout                  19.1           cm
     Area of Feed Flange                Arg               xz Dy 44              286.52              om"
     Frequency                           F                 Input                 6175               MHz
     Wavelength                          A                300 /F               0.048583             m
     Transmit Power                      P                 Input                $50,00              W
     Antenna Gain (dBi)                 Glss               Input                 46.0               dBi
     Antenna Gain (factor)              a                 19c                  39810.7              na
     Pi                                  i               Constant             3.1415927             n/a
     Antenna Efficiency                  1              GMIRD®)                      0.66           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)
                                                                            = 178.3 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 n Rfia)                     (2)
      i
                                                                            = 34.865 W/m*
                                                                            = 3.487 mW/cm*

  i       2.      Near Field Calculation

          Power flux density is considered to be at a maximum value throughout the entire length of the
  ;       defined Near Fleld region. The region is contained within a cylindrical volume having the same
  |       diameter as the antenna. Past the boundary of the Near Fleld 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                               Rar = D* 7 (4 A)                     (8)
  i                                       .                                 = 74.3 m

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

bol            Near Fleld Power Density                               Sy = 16.0 71 P / (1 D°)              (4)
bol                                                                         = 81.390 W/m*
                                   ‘                                        =8.139 mWiem*
          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
          censity decreases inversely with distance in the Trangition region, the power density decreases
          inversely with the square of the distancein the Far Fleld region. The maximum power density in
          the Transition region will not excesd 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                        $ = Sn BuZ P                         (5)
                                                                        = 8139 mW/cm®


Radiation Hazard Report                                                           Page 8 of 5


4.      Region between the Feed Assembly and the Antenna Reflector

Transmissions from the feed assembly are directed toward the antenna reflector surface, and are
confined within a conical shape defined by the type of feed assembly. The most common feed
assemblies are wavegulde flanges, homs or subreflectors. The energy between the feed assembly
and reflector surface can be calculated by determining the power density at the feed assembly
surface. This can be determined from the following equation:

     Power Density at the Feed Flange                     Sy =4000 P / Arg                      (6)
                                                               = 4886.202 mW/cm*

5.      Main Reflector Region

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

     Power Density at the Reflector Surface            Ssurtace =4 P / Asurtace                 (7)
                                                                = 128444 W/m"
                                                               = 12844 mW/iem"


6.      Region between the Reflector and the Ground

Assuming uniform lllumination 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 / Asurtace                      (8)
                                                               =80.861 W/im*
                                                               = 8.086 mW/em*


 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                                                (mWicm*)                Hazard Assessment
 1. Far Field (ARg= 178.3 m}                       Sy        8.487               Potential Hazard
 2, Neat Field (Ry «74.3 m)                        Sy        8.139               Potential Hazard
 3. Transition Region (Ry < R< Ry)                 $         8.139               Potentlal Hazard
 4. Between Feed          Assembly and             Ste    4886.202               Potential Hazard
     Antenna Reflector
 5. Main Reflector                                 Scutece     __12.344          Potential Hazard
 6. Between Reflector and Ground                   S            3.086            Potential Hazard

             Table 5. Summary of Expected Radiation levels for Controlled Environment
                                                Calculated Maximum
                                              Radlation Power Density
_Region                                            Level (mW/cm)              Hazard Assessment
1. Far Field (Ry= 178.3 m)                         Sr           8487           Satisties FCC MPE
2. Near Field (R,; = 74.3 m)                       Su           8.189           Potential Hazard
3. Transition Region (Ry < R; < Ry)                S,           8139            Potential Hazard
4.  Between Feed Assembly and                      S,        4886.202           Potential Hazard
    Antenna Reflector
5. Main Reflector                                  Scutace     12344             Potential Hazard
6. Between Reflector and Ground                    S.          . 3.086         Satisfies FCC MPE _

 it is the applicant‘s responsibility to ensure that the public and operational personnel are not
 exposed to harmful levals 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 propeses to comply with the MPE limits by one
 or motre of the fellowing methods.


 Means of Compliance Uncontrolled Areas

 This antenna will be located on the rooftop of a building. The rooftop will be not be accessible by
 the general public. The rocftop area will be sufficient to prohiblt the general public from having
 access the areas that exceed the MPE limits

 Since one diamater removed from the main beam of the antenna or 14 diameter removed from the
 edgs of the antenra the RF levels are reduced by a factor of 100 or 20 dB. None of the areas
 exceeding the MPE levels will be accassible by the general public.


Radiation Hazard Report                                                           Page 5 of 5

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 lavels.


Means of Compliance Controlled Areas


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

The transmitters will be turned off during antenna maintenance.



Prepared By


Timothy 0. Crutcher
Frequency Planner
COMSEARCH
19700 Janelia Farm Boulevard
Ashbum, VA 20147


DATED: June.10, 2011




                                                                                                      |
                                                                                                      1
                                                                                                      i
                                                                                                       i
                                                                                                       I
                                                                                                       I



Document Created: 2019-04-14 22:24:45
Document Modified: 2019-04-14 22:24:45

© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC