Attachment Rad Haz Report

This document pretains to SES-LIC-20170417-00390 for License on a Satellite Earth Station filing.

IBFS_SESLIC2017041700390_1205551

                                                       Radiation Hazard Analysis


                                                                         1.6 Meter
                                                                             ,

                  Introduction
                  A radiation hazard anaylsis is presented for a 1.6 meter ku band aperture antenna to be installed in SESVarious.
                  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 4/14/2017                                                      1 of 2                                                    1.6m Haz. Analysis.xls


                                                             Radiation Hazard Analysis


                                           Operator: SES
                                Location Designation: Various                                    FCC Callsign:
                                             County:                                                  SES ID:
                                               Town:                                                     STA:
                                           State/Zip:
                             Input Values                  Value                        Unit                          Band          Frequency
                                   D = Aperture Diameter            1.60            Meters                             L            1000-2000
                                d = Subreflector Diameter           0.056           Meters                              S           2000-4000
                                       G = Antenna Gain             45.3                dBi                            C            4000-8000
                                        FCC Designation               ku             Band                              X           8000-12500
                                           F = Frequency           14.125            GHz                               Ku          12500-18000
                             P = Transmitter Power Watts:             40             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)           2.00            meters                             V           50000-75000

                     OET 65 Calculated Values                    Formula            Value            Unit
                                                                     c
                                           λ= Wavelength                            0.0212     meters
                                                                     F
                                                                     (G/10)
                                      G = Antenna Gain            10             33884.41561   (W) linear
                                                                  Gλ2/4π
                              η = Apperture Efficiency                                  60%    percentage
                                                                   πD2/4
                                   A = Area of reflector            πR2              2.011     meters 2
                                a = area of subreflector             πr
                                                                      2
                                                                                    24.630     cm 2
                                                                     D2             30.153     meters
                              R nf = Near-Field Region
                                                                     4λ                5       Meters AGL
                                                                    >Rnf            30.153     >meters
                                R t = Transition Region
                                                                    <Rff            72.368     <meters
                                R ff = Far Field Region            0.6D2            72.368     meters
                                                                      λ               13       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                           6496.120         mW/cm2
                                                                      a                                              Note 1           Note 2
                                                                     4P                                           >FCC MPE See     >FCC MPE See
         2                              Antenna Surface                             7.958          mW/cm2
                                                                      A                                              Note 1           Note 2
                                                                      P                                           >FCC MPE See
         3                      Main Reflector Ground                               1.989          mW/cm2                           <FCC MPE
                                                                      A                                              Note 1
                                                                    4η P                                          >FCC MPE See
         4            S nf =Near-Field Power Density                                4.808          mW/cm2                           <FCC MPE
                                                                      A                                              Note 1
                                                                                                                  >FCC MPE See
         5        S t = Max Transition Power Density               < Snf            4.808          mW/cm2                           <FCC MPE
                                                                                                                     Note 1
                                                                     PG                                           >FCC MPE See
         6         S ff = Max Far field Power Density                               2.059          mW/cm2                           <FCC MPE
                                                                   4πRff2                                            Note 3
         7           Off Access Level Near Field                 Snf - 20 dB       0.04808         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 2 meters above ground level at the minimum elevation angle which is not accessable to the
               general public.




Generated 4/14/2017                                                            2 of 2                                              1.6m Haz. Analysis.xls



Document Created: 2017-04-14 11:04:34
Document Modified: 2017-04-14 11:04:34

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