Attachment RadHaz_MtAiry287rpt

This document pretains to SES-MFS-20130925-00836 for Modification w/ Foreign Satellite (earth station) on a Satellite Earth Station filing.

IBFS_SESMFS2013092500836_1013694

Radiation Hazard Analysis 13.1 Meter K8 Mt. Airy, Maryland 21771 Introduction A radiation hazard anaylsis is presented for a 13.1 meter Ku band aperture antenna to be installed in Mt. AiryMaryland at the SES Woodbine E/S. This Radiation Analysis calculates the non-ionizing radiation levels expected to be emitted from the earth station on a worse cases basis and is performed in accordance with the Federal Communications Commissions Office of Engineering and Technology (OET) Bulletin, No. 65. Requirements OET 65 outlines the maximum permissible exposure limits in two cases for operation in this frequency range. 1. The first case is the maximum level that a person may be exposed to in the general population. The exposure limit is defined as a non-ionizing power level equal to 1 milliwatt per centimeter squared averaged over a thirty minute period. 2. The second case is a controlled environment where the maximum permissible exposure limit must not exceed 5 milliwatts per centimeter squared averaged over any six minute period. Summary The results indicate that no significant hazard will be presented to the general population and will be fully mitigated in the controlled area by the use of procedures that require the removal of transmit power before accessing the area around the main reflector. Analysis This analysis was performed on seven zones with the results shown in Radiation Hazard Zones. The Table labeled Input Values provides the - input data required to perform the analysis. The table labeled OET 65 Calculated Values provides the intermediate calculation used to perform the assessment in accordance with OET 65. The Analysis is performed for each a the each of seven radiation zones as shown in figure 1 – Analysis Zones. These zones are: 1. Point between the feed and the sub-reflector 2. The power at the surface of the antenna 3. The power level between the main reflector and ground 4. The near-field or Fresnel region in which the maxima can be reached before the field starts to diminish with distance 5. The Transition region where power begins to decrease inversely with distance from the antenna 6. The Far Field or Fraunhofer region where power decreases inversely with the square of the distance. This is the point at which the antenna beam is fully collimated 7. The off axis level in the near field. This is defined as the area outside of the main beam removed and at least one antenna diameter removed from the main beam Generated 9/24/2013 1 of 2 RadHaz_MtAiry287rpt.xls

Radiation Hazard Analysis Operator: SES Location Designation: Woodbine E/S FCC Callsign: E050287 County: Carroll SES ID: K8 Town: Mt. Airy STA: State/Zip: Maryland 21771 Input Values Value Unit Band Frequency D = Aperture Diameter 13.10 Meters L 1000-2000 d = Subreflector Diameter 1.37 Meters S 2000-4000 G = Antenna Gain 63.5 dBi C 4000-8000 FCC Designation Ku Band X 8000-12500 F = Frequency 14.500 GHz Ku 12500-18000 P = Transmitter Power Watts: 238.78 Watts K 18000-25500 R ua = closest point to uncontrolled area 30 meters Ka 26500-40000 Elevation angle at closest point R ua 8 Degrees O 40000-50000 Height (AGL) 4.18 meters V 50000-75000 OET 65 Calculated Values Formula Value Unit c λ= Wavelength 0.0207 meters F (G/10) G = Antenna Gain 10 2238721.139 (W) linear Gλ2/4π η = Apperture Efficiency 57% percentage πD2/4 A = Area of reflector πR2 134.782 meters 2 a = area of subreflector πr2 14741.138 cm 2 D2 2075.004 meters R nf = Near-Field Region 4λ 289 Meters AGL >Rnf 2075.004 >meters R t = Transition Region <Rff 4980.010 <meters R ff = Far Field Region 0.6D2 4980.010 meters λ 693 Meters AGL Exposure Limits Radiation Analysis Zone Formula Level Value General Public Occupational <1mW/cm2 <5mW/cm2 4P >FCC MPE See >FCC MPE See 1 Power Subreflector 64.793 mW/cm2 a Note 1 Note 2 4P 2 Antenna Surface 0.709 mW/cm2 <FCC MPE <FCC MPE A P 3 Main Reflector Ground 0.177 mW/cm2 <FCC MPE <FCC MPE A 4η P 4 S nf =Near-Field Power Density 0.400 mW/cm2 <FCC MPE <FCC MPE A 5 S t = Max Transition Power Density < Snf 0.400 mW/cm2 <FCC MPE <FCC MPE PG 6 S ff = Max Far field Power Density 0.172 mW/cm2 <FCC MPE <FCC MPE 4πRff2 7 Off Access Level Near Field Snf - 20 dB 0.00400 mW/cm2 <FCC MPE <FCC MPE Notes 1. The antenna is installed in a controlled location access is restricted to authorized personnel only. The antenna is marked with RF Radiation Hazard signage. 2. Inside the controlled area, MPE levels exceed the MPE exposure for occupational levels. The levels will be reduced to safe MPE by removing power to the transmitters when work is performed on or around the antenna. This area can only be accessed by qualified personnel. 3. The field develops 4.18 meters above ground level at the minimum elevation angle which is not accessable to the general public. Generated 9/24/2013 2 of 2 RadHaz_MtAiry287rpt.xls


Document Created: 2013-09-24 14:21:34
Document Modified: 2013-09-24 14:21:34
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