Attachment rad haz WB K9 DBS

This document pretains to SES-LIC-20140605-00427 for License on a Satellite Earth Station filing.

IBFS_SESLIC2014060500427_1048182

                                            Radiation Hazard Analysis


                                                         13.1 Meter K9
                                                   Mount Airy, Maryland 21771

         Introduction
         A radiation hazard anaylsis is presented for a 13.1 meter Ku band aperture antenna to be installed in Mount
         AiryMaryland at the SES Woodbine ES. This Radiation Analysis calculates the non-ionizing radiation levels
         expected to be emitted from the earth station on a worse cases basis and is performed in accordance with the
         Federal Communications Commissions Office of Engineering and Technology (OET) Bulletin, No. 65.


         Requirements
         OET 65 outlines the maximum permissible exposure limits in two cases for operation in this frequency range.

            1. The first case is the maximum level that a person may be exposed to in the general population. The
               exposure limit is defined as a non-ionizing power level equal to 1 milliwatt per centimeter squared
               averaged over a thirty minute period.
            2. The second case is a controlled environment where the maximum permissible exposure limit must not
               exceed 5 milliwatts per centimeter squared averaged over any six minute period.

         Summary
         The results indicate that no significant hazard will be presented to the general population and will be fully
         mitigated in the controlled area by the use of procedures that require the removal of transmit power before
         accessing the area around the main reflector.


         Analysis
         This analysis was performed on seven zones with the results shown in Radiation Hazard Zones. The Table
         labeled Input Values provides the - input data required to perform the analysis. The table labeled OET 65
         Calculated Values provides the intermediate calculation used to perform the assessment in accordance with
         OET 65. The Analysis is performed for each a the each of seven radiation zones as shown in figure 1 –
         Analysis Zones. These zones are:
            1. Point between the feed and the sub-reflector
            2. The power at the surface of the antenna
            3. The power level between the main reflector and ground
            4. The near-field or Fresnel region in which the maxima can be reached before the field starts to diminish
               with distance
            5. The Transition region where power begins to decrease inversely with distance from the antenna
            6. The Far Field or Fraunhofer region where power decreases inversely with the square of the distance.
               This is the point at which the antenna beam is fully collimated
            7. The off axis level in the near field. This is defined as the area outside of the main beam removed and at
               least one antenna diameter removed from the main beam




Generated 5/23/2014                                           1 of 2                                        rad haz WB K9 DBS.xls


                                                        Radiation Hazard Analysis




                                      Operator:             SES
                           Location Designation:            Woodbine ES                       FCC Callsign:
                                        County:             Carroll                                SES ID: K9
                                          Town:             Mount Airy                                STA:
                                      State/Zip:            Maryland        21771
                        Input Values                            Value           Unit                            Band         Frequency
                            D = Aperture Diameter                13.10           Meters                          L            1000-2000
                         d = Subreflector Diameter               1.37            Meters                          S            2000-4000
                                G = Antenna Gain                 63.7                dBi                         C            4000-8000
                                 FCC Designation                  Ku             Band                            X           8000-12500
                                    F = Frequency               17.300            GHz                            Ku         12500-18000
                      P = Transmitter Power Watts:                400            Watts                           K          18000-25500
                R ua = closest point to uncontrolled area          30           meters                           Ka         26500-40000
                Elevation angle at closest point R ua              10           Degrees                          O          40000-50000
                                      Height (AGL)               5.21            meters                          V          50000-75000

                OET 65 Calculated Values                      Formula            Value            Unit
                                                                  c
                                      λ= Wavelength                              0.0173     meters
                                                                  F
                                 G = Antenna Gain              10 (G/10)      2344228.815   (W) linear
                                                                   2
                                                               Gλ /4π
                         η = Apperture Efficiency                                    42%    percentage
                                                               πD2/4
                                                                πR
                                                                    2
                              A = Area of reflector                              134.782    meters 2
                           a = area of subreflector              πr2           14741.138    cm
                                                                                               2

                                                                 D2             2475.695    meters
                         R nf = Near-Field Region
                                                                 4λ                430      Meters AGL
                                                                >Rnf           2475.695     >meters
                           R t = Transition Region
                                                                <Rff            5941.667    <meters
                                                                      2
                           R ff = Far Field Region             0.6D             5941.667    meters
                                                                  λ               1032      Meters AGL

                                                                                                                   Exposure Limits
            Radiation Analysis Zone                           Formula            Level           Value    General Public   Occupational
                                                                                                            <1mW/cm2        <5mW/cm2
                                                                  4P                                       >FCC MPE See    >FCC MPE See
    1                           Power Subreflector                              108.540         mW/cm2
                                                                   a                                          Note 1          Note 2
                                                                  4P                                       >FCC MPE See
    2                              Antenna Surface                               1.187          mW/cm2                       <FCC MPE
                                                                   A                                          Note 1
                                                                   P
    3                     Main Reflector Ground                                  0.297          mW/cm2      <FCC MPE         <FCC MPE
                                                                   A
                                                                 4η P
    4            S nf =Near-Field Power Density                                  0.493          mW/cm2      <FCC MPE         <FCC MPE
                                                                   A
    5        S t = Max Transition Power Density                  < Snf           0.493          mW/cm2      <FCC MPE         <FCC MPE
                                                                  PG
    6         S ff = Max Far field Power Density                                 0.211          mW/cm2      <FCC MPE         <FCC MPE
                                                                4πRff2
    7           Off Access Level Near Field                   Snf - 20 dB       0.00493         mW/cm2      <FCC MPE         <FCC MPE

  Notes
        1. The antenna is installed in a controlled location access is restricted to authorized personnel only. The antenna is
          marked with RF Radiation Hazard signage.
        2. Inside the controlled area, MPE levels exceed the MPE exposure for occupational levels. The levels will be reduced
          to safe MPE by removing power to the transmitters when work is performed on or around the antenna. This area
          can only be accessed by qualified personnel.
        3. The field develops 5.21 meters above ground level at the minimum elevation angle which is not accessable to the
          general public.




Generated 5/23/2014                                                         2 of 2                                   rad haz WB K9 DBS.xls



Document Created: 2014-05-23 11:46:15
Document Modified: 2014-05-23 11:46:15

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