Attachment radhaz

This document pretains to SES-LIC-20000301-00267 for License on a Satellite Earth Station filing.

IBFS_SESLIC2000030100267_129051

From : Sistel di Claudio Re To : Mr. Frank R. Jazzo lngegnere eletbonico Fletcher, Heald & Hildreth, P.LC. Consulenze tecniche in Aftorneys at Law Scienze delle Telecomunicationi Ilth Floor , 1300 North 17’h Street Arlington, Virginia 22209 Strada Valpiana, 8 10132 TORINO - My Tel. *39-0ll-899.64.06/899.48.65 Fax. +39-011-698.11.71 Cellphone : +39-337-229773 Gsm : +39-335-6107300 ANALYSIS OF NON - IONWJNG RADIATION FOR A 3:. aMElTER EARTH STATION This report analyzes the non - ionizing radiation levels for a 3 - &leter earlh station . The Office of Engineering and Technology Bulletin , No. 65 , edition 97-O1 , specifies (hai there are two separate liers of exposure limits that are dependent on Ihe situation in which exposure take place and/or the status of the individuals who are subject to Lheexposure I The Maximum Permissible Exposure (h4PE) limit for person in a Uncontrolled/Public environment to non - ionizing radiation over a thtihy minute period is a power density equal lo 1 mW/cm **2 ( one milliwatt per centimeler squared ) . The Maximum Permissible Exposure (MPE) limit for persons in a Controlled/Occupational environment to non - ionizing radiation over a six minute period is a power density equal to 5 mW/cm * *2 ( five milliwatts per centimeter squared ) . It is the purpose of [his report to determine Ihe power flux densities of the earth station in the far field , near field , transition region , between the feed horn and the main reflector surface , at the main reflector surTace, and between the antenna edge and the ground . The parameters that where used to calculate the various power flux densities for this earth stations, together wirh Ihe results of the calculations and the Hazard Assessmentsare listed in the following table .

SYSTEM SPECS I . Antenna diameter D 3.600 m Antennasurfacearea Sa 11.335 m-2 Feed Horn Diameter Ds 12.000 cm Area of Feed Horn As 113.040 cm”2 Frequency f 6175.00 Tvlhz 0 Wavelenght lambd 0.049 m Transmit Power at Flange ; 4.000 W Antenna Gain dBi G 45.680 Antenna Gain (Times ) Ges 38725.7 64 Antenna aperture efkiency eta 0.550 IFar Field Calculations I I Dislance lo the Far Field Region On-Axis Power Densitv in the Far Rf Wt 178.334 0.380 kIl”2 I Near Field Calculations

Transition Region Calculations Main reflector and Feed Horn Main reflector Region Main Reflector and Ground 1 SYSTEM PARAMETERS 1 Antenna diameter D 2.400 m Antenna surface area Sa 4.522 m**2 Feed Horn Diameter DS 12.000 cm Area of Feed Horn A5 113.040 cm”2 Frequency f 6175.000 MttZ Wavelenght lambda 0.049 Transmit Power at Flange P 4.000 Ii Antenna Gain dBi G 48,100 Antenna Gain ( Times ) Ges 64565.423 Antenna aperture efficiency eta 0.550 3

EXPECTED RADIATION HAZARD ASSESSMENT HAZARD ASSESSMENT LEVELS MPE for Uncontrolled Environment MPE for Controlled Environment LIMIT = 1 mWlcm”2 LIMIT = 5 mWkm”2 Far Field Calculations Distance lo the Far Field Rf 71.136 m Region On-Axis Power Density in the Wf 4.063 W/m”2 Far Field I Transition Region Calculations Main reflector and Feed Horn Main reflector Region I Power Density at Main Reflector Surface Wm 3.539 W/m”2 I Main Reflector and Ground

Based on this analysis it is concluded that the FCC RF Guidelines have been exceeded only in the region between the feed horn and the antenna surface . The applicant proposes to colnply with the Maximum Permissible Exposure @WE) limits of I mWkm2 for the Uncontrolled areas and the MPE limits of 5 mW/cm2 for the Controlled areas by one or more of the following methods : MEANS OF COMPLIANCE UNCONTROLLED AREAS This antenna will be located in a fenced area , The fenced area will be sufkient to prohibit access to the areas that exceed the IvfPE limits . The general public will not have access to areas within !4 diameter removed from the edge of the anlenna .

Since one diameter removed from the main beam of the antenna or % diameter removed From the edge of the antenna the RF levels are reduced by a factor of 100 ( 20 dB) . None of the areas exceeding the MF’E levels will be accessible by the general public . Radiation hazard signs will be posted while this earth station is in operation . The applicant will ensure that no buildings or other obstacles will be in the areas that exceed the MPE levels MEANS OF COMPLLANCE CONTROLLED AREAS The earth station’s operational will not have’access to the areas that exceed the MPE levels while the earth slation is in operalion . The transmitter will be turned off during antenna maintenance . 6

CERTIFICATION I hereby certify that I am lhe technically qualified person responsible for the preparation of the hazard assessment, and that I have rewiewed this radiation hazard assessment, and that it is complete and correct to the best of my knowledge . BY : Claudio Re Claudio Fulvio Roberto Re University Degree in Electronics and Telecommunications Sk tel DATED : August 10 , 1999 EJ 0 7 I- N


Document Created: 2000-03-02 17:21:06
Document Modified: 2000-03-02 17:21:06
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