Attachment E110055RADHAD.pdf

E110055RADHAD.pdf

SUPPLEMENT submitted by IHLAS HABER AJANSI IHA

NEW RAD HAD

2011-07-22

This document pretains to SES-LIC-20110406-00403 for License on a Satellite Earth Station filing.

IBFS_SESLIC2011040600403_907251

ANALYSIS OF A NON-IONIZING RADIATION FOR A 1.2 METER EARTH STATION SYSTEM This report analysis the non-ionizing radiation levels for a 1.2-m earth station system. The analysis and calculations in this report comply with the methods described in the 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 separate tiers of exposure limits that are dependent on the situation in which the exposure takes place and/or the status of the individuals who are subject to the exposure. The Maximum Permissible Exposure (MPE) limits for person in a General Population/Uncontrolled environment are shown in Table 1. MPE limits for persons in an Occupation/Controlled environment 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 Antenna Diameter 1.2 meters Antenna Surface Area 1.13097336 meter sq. Feed Flange Diameter 12 cm Area of Feed Flange 113.097336 cm sq. Frequency 14250 MHz Wavelength 0.02105263 m Transmit Power 20 W Antenna Gain 43.20 dBi Antenna Gain Factor 20892.96 Pi 3.14159265 Antenna Efficiency 0.65155419

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 = 1.974 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 = 4.609 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 = 4.609 mW/cm2 , 4- Region between the Main Reflector and Subrefletor Not applicable 5- Main Reflector Region Power density at the Main reflector Surface Ssurface (Ssurface) is calculated as below Ssurface = 7.074 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 = 1.768 mW/cm2 7- SUMMARY OF CALCULATIONS Table 4. Summary of expected Radiation Levels for Uncontrolled Environment Distance Density Uncontrolled (m) (mW/cm2) Far Field 41.04 1.974 Potential Hazard Near Field 17.1 4.609 Potential Hazard Transition Region 4.609 Potential Hazard feed assembley and 707.96 Potential Hazard Antenna Ref Main Reflector 7.074 Potential Hazard

Between Main 1.768 Potential Hazard Reflector & Ground Table 5. Summary of Expected Ration Levels for Controlled Environment Distance Density Controlled (m) (mW/cm2) Satisfies FCC Far Field 41.04 1.974 MPE Satisfies FCC Near Field 17.1 4.609 MPE Satisfies FCC Transition Region 4.609 MPE feed assembley and 707.96 Potential Hazard Antenna Ref Main Reflector 7.074 Potential Hazard Between Main Satisfies FCC 1.768 Reflector & Ground MPE 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 on top of the applicant’s truck. The applicant will mark the earth station with the standard radiation hazard warnings. Since one diameter removed from the center of the main beam the levels are down at least 20 dB, or by a factor of 100, these potential hazards do not exist for either the public, or for earth station personnel. The applicant will ensure that the main beam of the antenna will be pointed at least one diameter away from any buildings or other obstacles in those areas that exceed the MPE levels. Finally the earth station’s operation personnel 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 maintenance, so that MPE standards will be complied with for those regions in close proximity to the main reflector, which could be occupied by operating personnel.


Document Created: 2011-07-22 14:33:45
Document Modified: 2011-07-22 14:33:45
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