Attachment RF Radiation Analysi

This document pretains to SES-LIC-20080818-01065 for License on a Satellite Earth Station filing.

IBFS_SESLIC2008081801065_659019

F RADIATION HAZARD ANALYSIS Exhibit #1 Antenna Dia. (D)=2.4 Meters 7.874 Feet Antenna Surface Area (SA)#4.523893 sq meteors Subreflector Dia. (DS)=§51.435 ocm 20.25 Inches Subreflector Surface Area (AS)=«2077.81 7 sq cm KU Wavelength at 14.250 GHz (LAMBDA)s.0211 meters Power at output of HPA flange=25.441 dB Path Loss to OMT (IL)=.6 dB Power at OMT Flange (P)=304.837 watts Antenna Gain at 14.250 GHz (G)=49.4 dBi Antenna Gain given in Power Ratio (GES)=.87096E+05 Antenna Aperture Efficiency (N)=.679 Region Radiation Level _HazardAssessment Far Field (RF) 163.79 m 537.368 ft 7.875 mW/icm sq Potential Hazard Near Fleld (WF) 68.24m 223.917 ¢ 18.301 mWi/icm sq Potential Hazard Transition Region (RT) equal to or less than Potential Hazard RuSRt«<Rf 18.301 mWi/icm sq Potential Hazard Between Main Reflector and ©2093.421 mWicm sq Potentlial Hazard Subreflector (WS) Main Reflector Region (WM) 18.477 mWiecm sq Potential Hazard Power Density Between Reflector 6.738 mWicm sq Potential Hazard and Ground Power Density 2.4 meters off axis from center of beam 2.808 mW/icm sq No Hazard Concluslon: 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 that it is pointed at, but safe when 2.4 meters off axis from the antenna look angle. The Area occupled by the general public will not exceed the ANSI limit of 5§ mW em sq. because the antenna is mounted on top of the truck, which is at least 9 feet above the ground, and . safety Increases with loock angles used by the Satellites in the United States on Dom. Sat. arch. 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 insure that the antenna path is clear at all times while the trangmitter is In operation. The only access to the roof of the truck, is a stored ladder which will only be used when the transmitter is off and not accessible by the general public, Note: See Exhibit #2 for how the above calculations were made.

Analysis of Non—lonizing Radiation Exhibit Ant@nn@ DI@Met@r, (D)S........,....0 0c ecrrerems » D —2.4 meters D:3.281 =7.874 Feet Antenna Surface Area, (Sa)® ................... m S0 -x-%-g Sa =4.524 sq meters Subreflector Diameter, (OD#8)=......................... Ds ~51.435 ocm Ds.3937=20.250 Inch‘s Ar®® Of SUDT@fI@CIOF, (AS}®.............ccsclccen As > ,‘.9'4‘)‘ As =2.07810 sq om Cant@er FF@qUONCY, (CT)Z..))...0....0.00.m mm CF ©14.250 GHz Wavelenght at (Cf), (Lambda)=................. o Lambda ~.0211 meters C—Band=.040 Ku—Band=.0211 Transmit Power at HPA or VPC Flange, (P1)=.. P 350 & watts P2 =log(P1) 10 P2 =25.441 dB Path Loss from HPA or VPC to OMT, (Losg)=.. Loss *.6 dB P3 «P2 — Loss P3 #24.84| OMT Pwr in dB Power at OMT, (P)=...............o en p3 P srg!® P =304.837 OMT Pwr in watts Antenna Gain at (CT), (Ga@in)®...................ov} Gain +49.4 dBi Cxi Antenna Gain Converted to Power Ratio, (Ge§): 5,, . 10*’_"’9 Ges =8.71°10° Ratio Antenna Aperture Efficiency, (n)®................... n 5.679 Far Field (RFQ)#® Rf = '-61:95%?- Rf = 163.791 meters Rf:3.281 = §37.4 Feet Far Field Pwr Density (WQ= Wf—= ~~-q-°-?g—-—-.l Wf = T.875 mw sq m 4: x( RFRF) Near Flald (Rn)® ~34gihy, Rn=68,246 metere Rn3.281=223.917 Feet Near Field Pwr Density (Wn)= Wnn = 1-§"-"-'~P~~.l Wa = 18301 mw sq cm *{DD) Transition Region (Rt)s Rt = Wal Rt=18.301 mw sq cm (Equal to or lesgs then) Pwr Density at Sub Reflector (We)= 2P W3 > As 1000 Ws =293.421 mw sq ¢m Main Reflector Region Pwr Density (Wm)s Wm 2S'Pl Wm = 13.477 mw sq em Pwr Density between main reflector and ground (Wg)= We §2v.l We =6.738 mw sq cm Pwr Density between reflector eage and ground (WM)= W1 We 6 WI=2,808 mw sq cm


Document Created: 2008-08-18 10:19:02
Document Modified: 2008-08-18 10:19:02
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