Attachment Radiation Analysis

This document pretains to SES-LIC-INTR2009-07567 for License on a Satellite Earth Station filing.

IBFS_SESLICINTR200907567_782395

RF RADIA nON HAZARD ANALYSIS Exhibit#B Antenna Diameter, (D) = 4.6 meters / 15.093 Feet Antenna Surface Area, (Sa) = 16.619 sq meters Subreflector Diameter, CDs)= 22 centimeters KU Wavelength at 14.5 GHz (LAMBDA) = 0.0211 meters Power at output ofVPC flange = 28.189 dB Path Loss to OMT (IL) = 0.6 dB Power at OMT, (P) = 573.97 Watts Antenna Gain at 14.250 GHz, (G)= 54.4 dBi (2 port antenna gain) Antenna Gain given in Power Ratio, (Ges) = 2.773E+05 Antenna Aperture Efficiency (N) = 0.698 Region Radiation Level Hazard Assessment Far Field, (Rt) = 601.706 meters / 1974.198 Feet 3.499 mW/cm sq Potential Hazard Near Field, (Wt) = 250.711 meters / 822.582 Feet 9.645 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Potential Hazard Ru<Rt<Rf 9.645 mW/cm sq Between Main Reflector and 3019.814 mW/cm sq Potential Hazard Subreflector (Ws) Main Reflector Region (Wm) 6.907 mW/cm sq Potential Hazard Power Density Between Reflector 3.454 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 0.035 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) 0.096 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 target satellite. The Area occupied by the general public will not exceed the ANSI limit of I mW em sq. when the minimum safe distance is observed. The minimum safe distance in front of the antenna is calculated at 12.9meters when the antenna is operated at a minimum elevation angle of 15 degrees, assuming a height of 2 meters for an average person. The safety margin increases with look angles used by the Satellites in the United States on Dom. Sat. arch. The areas to the sides 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 antenna and trailer will be marked with the standard radiation hazard warnings. The warning signs will warn personnel to avoid the area around and in front of the reflector when the transmitter is operating. Additionally a barrier fence that extends 4.5 meters on each side and 13 meters in front of the dish is strongly recommended in order to establish a controlled access perimeter around the hazardous area. 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, in accordance with industry standard lockoutltagout procedures. 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. The only access to the roof of the truck is a stored ladder which will be used only when the transmitter is off and not accessible by the general public. Note: See Exhibit #Ba for how the above calculations were made.

Exhibit Ba Analysis of Non-Ionizing Radiation Antenna Diameter, (D) = D := 4.6 meters D ·3.281 = 15.093 Feet D·D Antenna Surface Area, (Sa) = Sa:=ff'-- Sa = 16.619 sq meters 4 Subreflector Diameter, (Ds) = Ds := 22 em Ds ·.3937 = 8.661 Inches As := ff . Ds . Ds Area of Subreflector, (As) = As = 380.133 sq em 4 Center Frequency, (Cf) = Cf:= 14.500 GHz Wavelength at (Cf), (Lambda) = Lambda:= 0.02l! meters C-Band ~ .049 Ku-Band ~ .0211 Transmit Power at HPA or VPC Flange, (PI) = PI:= 659.00 watts P2:= 10g(PI) ·10 P2 = 28.189 dB Path Loss from HPA or VPC to OMT, (IL) = Loss := 0.6 dB Power at OMT, (P)= P3 := P2 - Loss P3 = 27.589 OMT Pwr in dB P3 P:= 10 10 P= 573.97 OMT Pwr in watts Antenna Gain at (Cf), (Gain)= Gain := 54.43 dBi Gain Antenna Gain Converted to Power Ratio, (Ges)= Ges:= 10 10 Ges = 2.773E+05 Ratio Antenna Aperture Efficiency, (n )= n:= 0.6982 Rf:= .60· (D ·D) 601.706 meters Far Field (Rf)= Rf= Lambda Rf·3.281= 1974.20 feet Far Field Power Density (Wf)= Wf:= Ges·P .. 1 Wf= 3.499 mw sq em 4·ff·(Rf-Rf) Near Field (Rn) = Rn:= (D·D) Rn = 250.7l! meters 4·Lambda Rf ·3.281 = 822.582 feet 16·n·P Near Field Power Density (Wn)= Wn:= ·.1 Wn = 9.645 mw sq em ff·(D·D) Transition Region (Rt)= Rt:= Wn·l Rt = 9.645 mw sq cm (Equal to or less than) 2·P Pwr Density at Sub Reflector (Ws)= Ws := --·1000 Wm= 3019.814 mw sq cm As 2·P Main Reflector Region Pwr Density (Wm)= Wm:=--·.I Wm = 6.907 mw sq em Sa p Pwr Density between main reflector and ground (Wg )= Wg:=-·.I Wg = 3.454 mw sq em Sa Far Field Off Axis (WF)= WF:= Wf·.OI WF= 0.035 mw sq em Near Field Off Axis (WN)= WN:= Wn·.OI WN= 0.096 mw sq em


Document Created: 2019-04-09 19:26:39
Document Modified: 2019-04-09 19:26:39
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