Attachment Rad Haz Study

This document pretains to SES-LIC-20111223-01501 for License on a Satellite Earth Station filing.

IBFS_SESLIC2011122301501_929236

uQ(“‘- RF RADIATION HAZARD ANALYSIS Exhibit Antenna Diameter, (D) = 1.25 meters / 4.10125 Feet Antenna Surface Area (Sa) = 1.2272 sq meters Subreflector Diameter (Ds) = 0.0000 centimeters Ku Wavelength at 14.250 GHz {LAMBDA) = 0.21038067 meters Power output of VPC Flange= 19.031 dB Path Loss to OMT (IL) = 0.6 d8 Power at OMT, (P) = 69.68 Watts Antenna Gain at 14.250GHz (6G)= 43.40 dBi {2 port antenna gain} Antenna Gain given in Power Ration, (Ges) = 2.19£+04 Antenna Aperture Efficiency {N) = 0.650 Region Radition Level Hazard Assessment Far Field, (Rf) = 4.456 meters / 14.62 Feet 610.871 mW/em sq Potential Hazard Near Field, (Wf) = 1.857 meters / 6.092 Feet 14.762 mW/cem sq Potential Hazard Transition Region (Rt) equal to or less than Ru<Rt<Rf 14.762 mW/cem sq Potential Hazard Between Main Reflector N/A (no subreflector} and Subreflector (Ws) Main Reflector Region (Wm) 11.356 mW/cem sq Potential Hazard Power Density Between Reflector 5.678 mwW/em sq Potential Hazard and Ground Far Field Off Axis (WF) 6.109 mW/em sq Potential Hazard Near Field Off Axis (WN) 0.148 mwW/em sq Meets ANSI Requirements Conclusion: Based on the above analysis, harmful areas of Radiation do exist in the areas around the antenna and in the path of the antenna toward the satellite that it is pointed at. The Area occupied by the general public will not exceed the ANSt limit of 1 mW em sq. because the antenna is mounted on top of the truck, which is at least 8 feet above the ground, and safety increases with look angles used by the Satellites in the United States on Dom. Sat. arch. The areas on the ground 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 SNG 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 ensure 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 ladder that is not accessible by the general public. Note: See Exhibit #8Ba for how the above calculations were made.

[ Antenna Diameter, (D) = D: = 1.25 meters D*3.281= 4.101 Feet | Antenna Surface Area, (Sa) = Sare om" D*D Sa = 1.227 sq meters 4 f Subreflector Diameter, (Ds) = Ds: = 0 cm Ds*.3937 0.000 Inches ; 222 Ds*Ds Area of Subreflector, (As) = As:= 7 As= 0.000 sq meters { Center Frequency, {Cf) = Cf:= 14.250 GHz ] Wavelength at {Cf], (Lambda) = Lambda= 0.2103806709 meters Tansmit Power at HPA or VPC Flange, {P1) = Pi= 80.00 watts P2:=log(p1)*10 P2= 19.031 d8 Path Loss from HPA or VPC to OMT, (It) = Loss: = 0.6 P3:=P2—Loss P3= 18.431 OMT Pwr in dB Pi= 10 ;3} P= 69.677 OMT Pwr in watts Antenna Gain at (Cf}, (Gain) = Gain: = 43.40 dBi Antenna Gain Converted to Power Ratio (Ges)= Ges:t= 10 fgm Ges = 2.19E+04 Ratio Antenna Aperture Efficiency, {n} = ni= 0.6500 mommmonmnnmemommemmmm Far Field (RFf) = Rf= .60* (1y* (D*D) Rf = 4.456 meters Lambda RF*3.281= 14.621 feet . . Ges*P Far Field Power Density (Wf) = Wi= * .1 WE = 610.871 mw sq cm 4* mo* (RE*RF) Near Field (Rn) = Rn= (D+D) An= 1857 meters 4*Lambda Rf*3.281= 6.092 feet . ; 16*n*P Near Field Power Density (Wn) = Wn= * .1 Wn = 14.762 mw sq cm T. (D*D) h s g mw sq cm Transition Region (Rt) = Rt= Wn*l Rt= 14.762 (Equal to or less than} . 2*P Pwr Density at Sub Reflector (Ws) = We= *1000 Ws = N/A As Main Reflector Region Pwr Density (Wm) = Wm= ZS*P *4 Wm = 11.356 mw sq cm a Pwr Density between main reflector and we— P *4 we= 5.678 mw sq em ground (Wg) = Sa [ Far Field Off Axis (WF) = WF:= wi*.01 WF = 6.109 mw sq cm | [ Near Field Off Axis (WN) = WN:= Wn*.01 WN= 0.148 mw sq cm |


Document Created: 2011-12-05 14:48:03
Document Modified: 2011-12-05 14:48:03
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