Attachment Radiation report

This document pretains to SES-LIC-20110207-00119 for License on a Satellite Earth Station filing.

IBFS_SESLIC2011020700119_861156

ANALYSIS OF A NON-IONIZING RADIATION FOR A 1.2 METER EARTH STATION SYSTEM This report analysis the non-ionozing radiation levels for a 1.2-m earth station system. The analysis and calculations in this report comply with the methods described in th FCC Office of Engineering and Technology Bulletin, No.65. The radiation safety limits used in the analysis are in conformance with the FCC R&O 96-326. Bulletin No.65 and the FCC R&O specifies that there are two seperate tiers of exposure limits that are dependant on the situation in which the exposure takes place and/or the status of the individuals who are subject to the explosure. The Maximum Permissible Exposure (MPE) limits for person in a General Population/Uncontrolled enviroment are shown in Table 1. MPE limits for persons in an Occupation/Controlled enviromenment are shown in Table 2. The purpose of the analysis of this report is to determine the power flux density levels and to compare these levels to the specified MPEs Table 1 – Limits for General Population/Uncontrolled Exposure Frequency Range (MHz) Power Density (mW/cm2) 30-300 0.2 300-1500 Frequency (MHz)*(0.8/1200) 1500-100,000 1.0 Table 2 – Limits for General Occupational/Controlled Exposure (MPE) Frequency Range (MHz) Power Density (mW/cm2 30-300 1.0 300-1500 Frequency (MHz)*(0.8/1200) 1500-100,000 5.0 Table 3 – Formulas and Parameters Used for Determining Power Flux Densities Parameter Value Units Antenna Diameter 1.2 m Antena Surface Area 1,130973355 m2 Subreflector Diameter 0 cm Area of Subreflector 0 cm2 Frequency 14240 MHz Wavelength 0.02105263 m Transmit Power 22 W Antenna Gain (dBi) 43.00 dBi Antenna Gain (factor) 19952,62 n/a Pi 3.1415927 n/a Antenna Efficiency 0.622229 n/a

1 – Far Field Distance Calculation The distance to the beginning of the far field (Rff) and the on-axis power density (Sff) are calculated as below Rff = 41.040 m Sff = 2.074 mW/cm2 2 – Near Field Distance Calculation The distance to the end of the Near Field (Rnf) and the maximum power density in the Near Field (Snf) are calculated as below Rnf = 17.100 m Snf = 4.842 mW/cm2 3 – Transition Region Calculation The Transit Region is located between Near Field and Far Field Regions. The maximum power density in the Transit Region will not exceed that calculated for the Near Field region. The power density in the Transit Region (St) at a distance Rt is calculated as below St = 4.842 mW/cm2 , 4- Region Between the Main Reflector and Subrefletor No Subreflector used in this system. 5- Main Reflector Region Power density at the Main reflector Surface Ssurface (Ssurface) is calculated as below Ssurface = 7.781 mW/cm2 6- Region Between the main reflector and the Ground Power density between the Main Reflector and the Ground (Sg) is calculated as below Sg = 0.830 mW/cm2 7- SUMMARY OF CALCULATIONS Table 4. Summary of expected Radiation Levels for Uncontrolled Enviroment Expected Maximum Distance Region Radiation Power Hazard Assesement (m) Density Level mW/cm2 Far Field (Sff) 41,04 2.074 Potential Hazard Near Field (Snf) 17,1 4,842 Potential Hazard Transition Region (St) 4.842 Satisfiecs FCC MPE Main Reflector 14,147 Potential Hazard (Ssurface) Between Main Reflector & Ground 3,537 Potential Hazard (Sg)

Table 5. Summary of Expected Ration Levels for Controlled Enviroment Expected Maximum Distance Region Radiation Power Controlled (m) Density Level mW/cm2 Far Field 41,04 2.074 Satisfies FCC MPE Near Field 17,1 4,842 Satisfies FCC MPE Transition Region 4.842 Satisfies FCC MPE Main Reflector 14,147 Potential Hazard Between Main 3,537 Satisfies FCC MPE Reflector & Ground 8. CONCLUSION Based upon the above analysis it’s concluded that FCC RF Guidelines have been exceeded in the specific region(s) of Table 4. The applicant proposes to comply with MPE limits of Uncontrolled and Controlled areas. The antenna will be installed at the applicants facility on the roof of NPC Building, Washington DC. Since it’s a roof top with limited access only for the employee of the Building and Applicant, no general population will be present or near the direct path of main beam. The applicant will mark the earth station with the standart radiation hazard warnings. Finally the earth station’s operation personel will not have access to areas that exceeds the MPE levels, while the earth station is in operation. The transmitter will be turned off during the periods of maintanance, so that MPE standarts will be complied with for those regions in close proximity to the main reflector, which could be occupied by operating personnel.


Document Created: 2009-03-25 10:42:51
Document Modified: 2009-03-25 10:42:51
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