Attachment Mayo.pdf

This document pretains to SES-LIC-20100125-00111 for License on a Satellite Earth Station filing.

IBFS_SESLIC2010012500111_796005

                                   RF RADIATION ANALYSIS
                                               Exhibit A

Antenna Dia. (D) =                                      2.4 Meters                7.8744 Feet
Antenna Surface Area (SA) =                          4.524 sq meters
Subreflector Dia. (DS) =                               N/A (prime focus offset)
Subreflector Surface Area (AS) =                       N/A
KU Wavelength at 14.250 GHz (Lambda) =              0.0211 meters
Power at output of HPA flange =                     17.782 dB
Path Loss to OMT (IL)                                 0.48 dB
Power at OMT Flange (P) =                           53.722 watts
Antenna Gain at 14.250 GHz (G) =                      49.2 dBi
Antenna Gain given in Power Ratio (GES)= 8.318E+04
Antenna Aperture Efficiency (N)=                    0.6484


Region                                                Radiation Level         Hazard Assessment

Far Field (Rf)       163.791 m      537.4 ft         1.325 mW/icm sq          Potential Hazard
Near Field (Wf)      68.246 m     223.917 ft          3.08 mW/cm sq           Potential Hazard
Transition Region (Rt)                             equal to or less than
  Ru<Rt<Rf                                            3.08 mW/cm sq           Potential Hazard
Between Main Reflector                             N/A (no subreflector)
  and Subreflector (Ws)
Main Reflector Region (Wm)                           2.375 mW/cm sq           Potential Hazard
Power Density Between Reflector                      1188 mW/icm sq           Potential Hazard
  and Ground
Far Field Off Axis (WF)                              0.013 mWi/icm sq         Meets ANSI Requirements
Near Field Off Axis (WN)                             0.031 mW/cm sq           Meets ANSI Requirements

Conclusion: Based on the above analysis, harmful areas of radiation do exist in areas around the antenna
and in the path of the antenna toward the satellite at which it is pointed. The area occupied by the general
public will not exceed the ANSI limit of 1 mW cm sq. because the antenna is mounted on top of a building,
which does not have access by the general public. The areas on the ground and behind the antenna are
100 times less power (20 dB) when at a min. of the dia. of the reflector, this is reflected in the Off Axis
figures as seen above (WF) & (WN).
The antenna area 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
insure that the antenna path is clear at all times while the transmitter is in operation.

See Exhibit B for how the calculations were made


                                           ANALYSIS OF NON—IONIZING RADIATION
                                                        Exhibit B

Antenna Diameter (D)                                     D=                  2.4 meters            7.874 Feet

Antenna Surface Area (Sa)                               Sa= m ——                          Sa=      4.524 sq meters
                                                                       4
Subreflector diameter (Ds)                               Ds=0 cm                          Ds =         0 inches
                                                                  Ds —Ds
Area of Subreflector (As)                               As= t                             As=          0 sq cm
                                                                       4
Center Frequency (Cf)                                   CF = 14.250 GHz

Wavelength at (Cf), (Lambda)                             Lambda = 0.0211 meters           C band=0.049, Ku band=0.0211m

Transmit Power at HPA or VPC Flange (P1)                 P1=                 60 watts     P2=log(P1) 10          P2=     17.782 db

Path Loss from HPA or VPC to OMT (Loss)                  Loss=          0.48 db

Power at OMT (P)                                         P3=P2—Loss                       P3=     17.302 db

Antenna Gain at (Cf), (Gain)                            Gain=           49.2 dBi
                                                                      Gain
Antenna Gain Converted to Power Ratio, (Ges).            Ges =10710                       Ges= 8.318E+04         Ratio

Antenna Aperature Efficiency (n})                         0.6484
                                                             :0.60~(D-D)
Far Field (RF)                                          Rf                                Rf=    163.791 meters
                                                                Lambda
                                                             _ GesP _
Far Field Pwr Density (Wf)                                                                Wf=      1.325 mw sq cm
                                                              ~4 t (RFRA)
                                                               DD
Near Field (Rn)                                          Rn= —————                        Rn=     68.246 meters
                                                          n 4 —Lambda
                                                      _ 16:.n—P
Near Field Pwd Density (Wn)                          n=         +0.                       Wn=       3.08 mw sq cm
                                                        x (D—D)
Transition Region (Rt)                                   Rt= Wn—1                         Rt=       3.08 mw sq cm (equal to or less than)

Pwr Density at Sub Reflector (Ws)                       (N/A — No subreflector)
                                                                  2P
Main Reflector Region Pwr Density (Wm)                  Wm:=———+
                                                          m  En 0.1
                                                                  0.                      Wm=      2.375 mw sq cm
                                                                  P
Pwr Density between main reflector and ground (Wg)      Wg:= —+0.1                        Wo=      1.188 mw sq ocm
                                                          9 Sa
Far Field Off Axis (WF)                                                                   WF=      0.013 mw sq cm
                                                        WF := Wf:0.01
Near Field Off Axis (WN)                                                                  WN=      0.031 mw sq cm
                                                        WN:= Wn—0.01



Document Created: 2019-04-14 18:18:52
Document Modified: 2019-04-14 18:18:52

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