Attachment Rad Hazard Study

This document pretains to SES-AMD-20100407-00406 for Amended Filing on a Satellite Earth Station filing.

IBFS_SESAMD2010040700406_809533

Radiation H i Study (1.8m Qualinks E/S 2.5MHz BW 1) Parameters: Table 1. Summary of Expected Radiation levels for UNCONTROLLED ENVIRONMENT Antenna Diameter D 1.8 m Calculated Maximum Rediation power No. Region Density Level Hazard Assessment Antenna Surface Area Asurface 2.545 m Feed Flange Diameter Dra 9.1 cm 1_|Far Field Rf = 92.34 m S# 0.213 mW/cnt! Area of Feed Flange Afa 65.039 onf 2 |Near Field Raf = 38.475 m Snt 0.498 mW/ent Frequency F 14250 MHz 3 |Transition Region Re< Rr< Rir St 0.498 mW/nl Wavelength A $.021 m 4. |Between Feed Assembly and Abtenna Reflector [Sra 307.509 mW/eni| Potential Hazard Antenna Flange Input Power P 5.0 W 5 |Main Reflector Ssurface 0.786 mW/ent Antenna Gain (dBi) Ges 46.6 dBi 6 {Between Reflector and Ground (Sq 0.196 mW/ont Maximum EIRP EIRPmax 53.59 dBW Power Density Limits for General Population/Uncontrolled Exposure (MPE) = 1.0mW/or Feed Loss Floss 0.8 dB Table 2. Summary of Expected Radiation levels for:CONTROLLED ENVIRONMENT Antenna Gain (Factor) G 45708.819 Calculated Maximum Rediation power| No. Region Density Level Hazard Assessment Pi I 3.142 Antenna Efficiency n 0.634 1 _|Far Field Rr= 92.34 m Sr 0.213 mW/ent 2) Far Fleld Distance Calculation 2 |Near Field Rat = 38.475 m Snt 0.498 mW/erd Distance to the Far field Regioi Rrf 92.34 m 3 |Transition Region Rf< Re< Re St 0.498 mW/erd On—Axis Power density in the F Sy 2133 W/nt 4 |Between Feed Assembly and Abtenna Refleator |Sra 307.509 mW/onf| Potential Hazard 0.213 mW/ont 5 |Main Reflector Ssurface 0.786 mW/ert 3) Near Field Calculation 6 |Between Reflector and Ground Sq 0.196 mW/cnt Extent of the Near Field Rat 38.475 m Power Density Limits for General Occupational/Controlled Exposure (MPE) = 5.0mW/ert Near field Power Density Sat 4.979 W/nd 8) Conclusions — 0.498 mW/on! Based on this analysis it is concluded that the FCC RF Guidelines have been exceeded in the specific 4) Transition Region Calculation regions of table 1 and 2. We proposes to comply with the maximum Permissible Exposure(MPE) fimits Rt 38475 m of 1.0mW/erd for the uncontrolled areas and the MPE limits of 5.0mW/en for the contralled areas by Transition Region Power Densi St 0.4979 mW/ont one or more of followina methods: 5) Region between the Feed Assembly and the Antenna Reflector Means of Compliance Uncontrolled Areas Power Density at the Feed Fla Sra 307.500 mW/orf The area around this antenna will be roped off. The roped off area will be sufficient to prohibit access 6) Main Reflector Region to the areas that exceed the MPE limits. The general public will not have access to areas within Power Density at the Reflecto Ssurface 7.860 W/rd 1/2diameter removed from the edge of the antenna. 0.786 mW/onl Since one diameter removed from the main beam of the antenna or 1/2diameter removed from the 7) Region between the Reflector and the Ground edge of the antenna the RF levels are reduced by a factor of 100 or 20dB. None of the areas S9 1.965 W/rf exceeding the MPE levels will be accessible by the general public. 0.196 mW/onf Radiation hazard signs will be posted while this earth station is in operation. We will ensure that no buildings or other obstacles will be in the areas that exceed the MPE levels. Means of Compliance Controlled Areas The earth station‘s operational personal will not have access to the areas that exceed the MPE levels while the earth station is in operation. The transmitters will be turned off during antenna maintenance.

RadiationHazardStudyQuaLinks.2.5MHzBW} 1) Parameters Tabl ie 7. Summary of Expected Rediation levels for UNCONTROLLED ENVIRONMENT Antenna Diameter D 1.2 m Calculated Maximum Rediation power\ No. Region Density Level Hazard Assessment Antenna Surface Area Asurface 1131 rf Feed Flange Diameter Dfa 9.1 cm 1 |Far Field Rr = 41.04 m S 1.012 mW/cni} Potential Hazard Area of Feed Flange Afa §5.039 ont 2. |Near Field Rar = 17.100 m Sar 2.363 mW/cri| Potential Hazard Frequency F 14250 MHz 3 |Transition Region Ri < Rt< Rif St 2.363 mW/cm| Potential Hazard Wavelength A 0.021 m 4 |Between Feed Assembly and Abtenna Reflector |Sta 660.476 mW/cr| Potential Hazard Antenna Flange Input Power P 10.7 W 5 |Main Reflector Ssurface 3.798 mW/cni| Potential Hazard Antenna Gain (dBi) Ges 43.0 dBi 6 |Between Reflector and Ground Sg 0.950 mW/en Maximum EIRP EIRPmax 53.31 dBw Power Density Limits for General Population/Uncontrelied Exposure (MPE) = 1.0mW/ent Feed Loss Floss 0.48 dB Table 2. Summary of Expected Radiation levels for CONTROLLED ENVIRONMENT Antenna Gain (Factor) G 19952.623 No. Region Catculated N::r:::rym'_:::luatmn °°**"Hazard Assessment Pi T 3.142 Antenna Efficiency n 0.622 1 [Far Field Re =_ 41.04 m Sr 1.012 mW/ort 2) Far Field:Distance Calculation 2. |Near Field Rat = 17.100 m Sat 2.363 mW/enl Distance to the Far field RegioRef 41.04 m 3 |Transition Region Rr< Rt« Re St 2.363 mW/orl On—Axis Power density in the F S 10.124 W/ni 4 |Between Feed Assemibly. and Abtenna Reflector |Sta 660.476 mW/onl| Potential Hazard 1.012 mW/orf 5 |Main Reflector Ssurface 3.798 mW/ort 3) Near Field Calculation 6 |Between Reflector and Ground S4 0.950 mW/or Extent of the Near Field Rnt 17.100 m Power Density Limits for General Occupational/Controlled Exposure (MPE) = 5.0mW/cnt Near field Power Density Snt 23.634 W/n! 8) Conclusions — 2.363 mW/on Based on this analysis it is concluded that the FCC RF Guidelines have been exceeded in the specific 4) Transition Region Calculation regions of table 1 and 2. We proposes to comply with the maximum Permissible Exposure(MPE)fimits Re 17.100 m of 1.0mW/erf for the uncontrolled areas and the MPE limits of 5.0mW/onf for the controlled areas by Transition Region Power Densi St 2.3634 mW/ent one or more of followina methods: 5) Region between the Feed.Assembly.and the Antenna.Reflector 4. Means of Compliance Uncontrolled Areas Power Density at the Feed Fla Sra 660.476 mW/em The area around this antenna will be roped off. The roped off area will be sufficient to prohibit access 6) Main Reflector Region to the areas that exceed the MPE limits. The general public will not have access to areas within Power Density at the Reflecto Ssurface 37.982 W/nt 1/2diameter removed from the edge of the antenna. 3.798 mW/crd Since one diameter removed from the main beam of the antenna or 1/2diameter removed from the 7) Region between the Reflector and the Ground edge of the antenna the RF levels are reduced by a factor of 100 or 20dB. None of the areas So 9.495 W/nt exceeding the MPE levels will be accessible by the general public. 0.950 mW/ont Radiation hazard signs will be posted while this earth station is in operation. We will ensure that no buildings or other obstacles will be in the areas that exceed the MPE levels. Means of Compliance Controlled Areas The earth station‘s operational personal will not have access to the areas that exceed the MPE levels while the earth station is in operation. The transmitters will be turned off during antenna maintenance.


Document Created: 2010-04-07 11:57:21
Document Modified: 2010-04-07 11:57:21
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