Attachment rad haz WB C14

This document pretains to SES-LIC-20140912-00723 for License on a Satellite Earth Station filing.

IBFS_SESLIC2014091200723_1058687

Radiation Hazard Analysis 7.3 Meter C-14 Mount Airy, Maryland 21771 Introduction A radiation hazard anaylsis is presented for a 7.3 meter C band aperture antenna to be installed in Mount AiryMaryland at the SES Woodbine ES. 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 8/20/2014 1 of 2 rad haz WB C14.xls

Radiation Hazard Analysis Operator: SES Location Designation: Woodbine ES FCC Callsign: County: Carroll SES ID: C-14 Town: Mount Airy STA: State/Zip: Maryland 21771 Input Values Value Unit Band Frequency D = Aperture Diameter 7.30 Meters L 1000-2000 d = Subreflector Diameter 1.07 Meters S 2000-4000 G = Antenna Gain 51.6 dBi C 4000-8000 FCC Designation C Band X 8000-12500 F = Frequency 6.175 GHz Ku 12500-18000 P = Transmitter Power Watts: 1715 Watts K 18000-25500 R ua = closest point to uncontrolled area 11 meters Ka 26500-40000 Elevation angle at closest point R ua 10 Degrees O 40000-50000 Height (AGL) 1.91 meters V 50000-75000 OET 65 Calculated Values Formula Value Unit c λ= Wavelength 0.0486 meters F (G/10) G = Antenna Gain 10 144543.9771 (W) linear Gλ2/4π η = Apperture Efficiency 65% percentage πD2/4 A = Area of reflector πR2 41.854 meters 2 a = area of subreflector πr2 8992.024 cm 2 D2 274.404 meters R nf = Near-Field Region 4λ 48 Meters AGL >Rnf 274.404 >meters R t = Transition Region <Rff 658.571 <meters R ff = Far Field Region 0.6D2 658.571 meters λ 114 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 762.898 mW/cm2 a Note 1 Note 2 4P >FCC MPE See >FCC MPE See 2 Antenna Surface 16.390 mW/cm2 A Note 1 Note 2 P >FCC MPE See 3 Main Reflector Ground 4.098 mW/cm2 <FCC MPE A Note 1 4η P >FCC MPE See >FCC MPE See 4 S nf =Near-Field Power Density 10.618 mW/cm2 A Note 1 Note 2 >FCC MPE See >FCC MPE See 5 S t = Max Transition Power Density < Snf 10.618 mW/cm2 Note 1 Note 2 PG >FCC MPE See 6 S ff = Max Far field Power Density 4.548 mW/cm2 <FCC MPE 4πRff2 Note 3 7 Off Access Level Near Field Snf - 20 dB 0.10618 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 1.91 meters above ground level at the minimum elevation angle which is not accessable to the general public. Generated 8/20/2014 2 of 2 rad haz WB C14.xls


Document Created: 2014-08-20 11:30:40
Document Modified: 2014-08-20 11:30:40
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