Attachment Rad Study

This document pretains to SES-LIC-20131209-01183 for License on a Satellite Earth Station filing.

IBFS_SESLIC2013120901183_1029926

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                                                            RF RADIATION HAZARD ANALYSIS
                                                                          Exhibit
         Antenna Diameter, (D) =                                   1.25 meters /         4.10125 Feet
         Antenna Surface Area (Sa) =                             1.2272 sq meters
         Subreflector Diameter (Ds) =                            0.0000 centimeters
         Ku Wavelength at 14.250 GHz {LAMBDA) =              0.21038067 meters
         Power output of VPC Flange=                             19.031 dB
         Path Loss to OMT (IL) =                                    0.6 d8
         Power at OMT, (P) =                                      69.68 Watts
         Antenna Gain at 14.250GHz (6G)=                          43.40 dBi {2 port antenna gain}
         Antenna Gain given in Power Ration, (Ges) =           2.19£+04
         Antenna Aperture Efficiency {N) =                        0.650


         Region                                                                       Radition Level             Hazard Assessment
         Far Field, (Rf) =                 4.456 meters /        14.62 Feet           610.871        mW/em sq    Potential Hazard
         Near Field, (Wf) =                1.857 meters /       6.092 Feet            14.762         mW/cem sq   Potential Hazard
         Transition Region (Rt)                                                       equal to or less than
                Ru<Rt<Rf                                                              14.762      mW/cem sq      Potential Hazard
         Between Main Reflector                                                       N/A (no subreflector}
         and Subreflector (Ws)
         Main Reflector Region (Wm)                                                   11.356        mW/cem sq    Potential Hazard
         Power Density Between Reflector                                              5.678         mwW/em sq    Potential Hazard
              and Ground
         Far Field Off Axis (WF)                                                      6.109         mW/em sq     Potential Hazard
         Near Field Off Axis (WN)                                                     0.148         mwW/em sq    Meets ANSI Requirements




         Conclusion: Based on the above analysis, harmful areas of Radiation do exist in the areas around the antenna and in the
         path of the antenna toward the satellite that it is pointed at. The Area occupied by the general public will not exceed the
         ANSt limit of 1 mW em sq. because the antenna is mounted on top of the truck, which is at least 8 feet above the ground,
         and safety increases with look angles used by the Satellites in the United States on Dom. Sat. arch. The areas on the
         ground and behind the antenna are 100 times less power (20dB) when at a min. of the dia. of the reflector. This is
         reflected in the Off Axis figures as seen above (WF) & (WN). The SNG will be marked with the standard radiation hazard
         warnings, and on the antenna itself. The warning signs will warn personnel to avoid the area around and in front of the
         reflector when the transmitter is operating. To ensure compliance with safety limits, the earth station transmitter will
         be turned off and marked to remain off whenever maintenance and repair personnel are required to work in the areas
         of potential hazard as defined in the above study. Additionally, the earth station personnel will be trained to ensure that
         the antenna path is clear at all times while the transmitter is in operation. The only access to the roof of the truck is a
         ladder that is not accessible by the general public.




         Note: See Exhibit #8Ba for how the above calculations were made.


    [                                 Antenna Diameter, (D) =       D: =                         1.25 meters                  D*3.281=     4.101      Feet                           |

                                Antenna Surface Area, (Sa) =       Sare      om"        D*D                                         Sa =    1.227     sq meters
                                                                                            4

    f                          Subreflector Diameter, (Ds) =        Ds: =                            0 cm                      Ds*.3937    0.000      Inches                         ;

                                                                             222       Ds*Ds
                                 Area of Subreflector, (As) =      As:=                  7                                          As=    0.000      sq meters

    {                                 Center Frequency, {Cf) =     Cf:=                        14.250 GHz                                                                            ]

                             Wavelength at {Cf], (Lambda) =        Lambda=          0.2103806709 meters


                 Tansmit Power at HPA or VPC Flange, {P1) =        Pi=                          80.00 watts
                                                                   P2:=log(p1)*10                                                   P2=    19.031     d8
                    Path Loss from HPA or VPC to OMT, (It) =       Loss: =                        0.6
                                                                   P3:=P2—Loss                                                      P3=    18.431     OMT Pwr in dB

                                                                    Pi=      10         ;3}                                          P=    69.677     OMT Pwr in watts

                               Antenna Gain at (Cf}, (Gain) =      Gain: =                      43.40 dBi

              Antenna Gain Converted to Power Ratio (Ges)=         Ges:t= 10 fgm                                                  Ges =    2.19E+04   Ratio

                          Antenna Aperture Efficiency, {n} =       ni=                         0.6500

                                                                                                              mommmonmnnmemommemmmm

                                               Far Field (RFf) =    Rf=             .60*      (1y*
                                                                                            (D*D)                                   Rf =   4.456      meters
                                                                                      Lambda                                  RF*3.281=    14.621     feet

                                   .               .                                  Ges*P
                              Far Field Power Density (Wf) =       Wi=                                                 * .1        WE =    610.871             mw sq cm
                                                                            4*         mo*              (RE*RF)



                                             Near Field (Rn) =      Rn=               (D+D)                                         An=    1857       meters
                                                                                     4*Lambda                                 Rf*3.281=    6.092      feet

                                  .                 ;                                 16*n*P
                            Near Field Power Density (Wn) =        Wn=                                                 * .1       Wn =     14.762              mw sq cm
                                                                            T.        (D*D)

                                            h       s   g                                                                                                      mw sq cm
                                      Transition Region (Rt) =      Rt=                     Wn*l                                    Rt=    14.762
                                                                                                                                                       (Equal to or less than}

                                  .                                                    2*P
                         Pwr Density at Sub Reflector (Ws) =       We=                                       *1000                Ws =     N/A
                                                                                        As

                  Main Reflector Region Pwr Density (Wm) =         Wm=                 ZS*P                       *4             Wm =      11.356              mw sq cm
                                                                                         a

        Pwr Density between main reflector                 and     we—                     P                  *4                  we=      5.678               mw sq em
                                               ground (Wg) =                            Sa

[                                   Far Field Off Axis (WF) =      WF:=            wi*.01                                         WF =     6.109               mw sq cm          |
[                                 Near Field Off Axis (WN) =       WN:=            Wn*.01                                         WN=      0.148               mw sq cm          |



Document Created: 2013-12-09 16:08:54
Document Modified: 2013-12-09 16:08:54

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