Attachment 8.1m Hazard Analysis

This document pretains to SES-LIC-INTR2019-00513 for License on a Satellite Earth Station filing.

IBFS_SESLICINTR201900513_1628807

                                                     Radiation Hazard Analysis



                                                          8.1 Meter Sunset Beach Temp
                                                                Haleiwa, 96712

              Introduction
              A radiation hazard anaylsis is presented for a 8.1 meter ku band aperture antenna to be installed in
              Haleiwa96712SESSunset Beach, HI. 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 2/25/2019                                                   1 of 2                                                      8.1m Haz. Analysis


                                                          Radiation Hazard Analysis

                                        Operator:             SES
                             Location Designation:            Sunset Beach, HI                  FCC Callsign:
                                          County:             Honolulu                               SES ID: Sunset Beach Temp
                                            Town:             Haleiwa                                   STA:
                                        State/Zip:            96712
                          Input Values                            Value             Unit                          Band          Frequency
                              D = Aperture Diameter                8.10             Meters                         L            1000-2000
                           d = Subreflector Diameter               1.05             Meters                          S           2000-4000
                                  G = Antenna Gain                 59.8                 dBi                        C            4000-8000
                                   FCC Designation                  ku              Band                           X           8000-12500
                                      F = Frequency               14.250             GHz                           Ku          12500-18000
                        P = Transmitter Power Watts:               350              Watts                          K           18000-25500
                  R ua = closest point to uncontrolled area         50             meters                          Ka          26500-40000
                  Elevation angle at closest point R ua             10             Degrees                         O           40000-50000
                                        Height (AGL)               9.00             meters                         V           50000-75000

                  OET 65 Calculated Values                       Formula            Value           Unit
                                                                      c
                                        λ= Wavelength                               0.0210    meters
                                                                      F
                                                                      (G/10)
                                   G = Antenna Gain              10              954992.586   (W) linear
                                                                      2
                                                                  Gλ /4π
                           η = Apperture Efficiency                                     65%   percentage
                                                                  πD2/4
                                A = Area of reflector              πR2             51.530     meters 2
                                                                    πr
                                                                       2                         2
                             a = area of subreflector                             8659.015    cm
                                                                      2
                                                                    D             779.639     meters
                           R nf = Near-Field Region
                                                                    4λ              135       Meters AGL
                                                                   >Rnf           779.639     >meters
                             R t = Transition Region
                                                                   <Rff           1871.132    <meters
                                                                  0.6D2           1871.132    meters
                             R ff = Far Field Region
                                                                     λ              325       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                               161.681        mW/cm2
                                                                     a                                           Note 1          Note 2
                                                                    4P                                        >FCC MPE See
      2                              Antenna Surface                                2.717         mW/cm2                        <FCC MPE
                                                                     A                                           Note 1
                                                                    P
      3                     Main Reflector Ground                                   0.679         mW/cm2       <FCC MPE          <FCC MPE
                                                                     A
                                                                   4η P                                       >FCC MPE See
      4            S nf =Near-Field Power Density                                   1.774         mW/cm2                        <FCC MPE
                                                                     A                                           Note 1
                                                                                                              >FCC MPE See
      5        S t = Max Transition Power Density                  < Snf            1.774         mW/cm2                        <FCC MPE
                                                                                                                 Note 1
                                                                    PG
      6         S ff = Max Far field Power Density                                  0.760         mW/cm2       <FCC MPE          <FCC MPE
                                                                  4πRff2
      7           Off Access Level Near Field                   Snf - 20 dB        0.01774        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 9 meters above ground level at the minimum elevation angle which is not accessable to the
            general public.




Generated 2/25/2019                                                            2 of 2                                          8.1m Haz. Analysis



Document Created: 2019-02-25 16:39:25
Document Modified: 2019-02-25 16:39:25

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