Attachment Rad Haz Analysis

This document pretains to SES-LIC-20170726-00809 for License on a Satellite Earth Station filing.

IBFS_SESLIC2017072600809_1233982

Radiation Hazard Analysis 6.3 Meter Duluth, MN 55811 Introduction A radiation hazard anaylsis is presented for a 6.3 meter Ka band aperture antenna to be installed in DuluthMN at the SESDuluth. 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 6/3/2017 1 of 2 rad haz auto report-tk-mod

Radiation Hazard Analysis Operator: SES Location Designation: Duluth FCC Callsign: County: SES ID: Town: Duluth STA: State/Zip: MN 55811 Input Values Value Unit Band Frequency D = Aperture Diameter 6.30 Meters L 1000-2000 d = Subreflector Diameter 0.7 Meters S 2000-4000 G = Antenna Gain 62.8 dBi C 4000-8000 FCC Designation Ka Band X 8000-12500 F = Frequency 28.000 GHz Ku 12500-18000 P = Transmitter Power Watts: 447 Watts K 18000-25500 R ua = closest point to uncontrolled area 50 meters Ka 26500-40000 Elevation angle at closest point R ua 10 Degrees O 40000-50000 Height (AGL) 2.50 meters V 50000-75000 OET 65 Calculated Values Formula Value Unit c λ= Wavelength 0.0107 meters F (G/10) G = Antenna Gain 10 1905460.718 (W) linear 2 Gλ /4π η = Apperture Efficiency 56% percentage πD2/4 A = Area of reflector πR2 31.172 meters 2 πr 2 2 a = area of subreflector 3848.451 cm 2 D 926.718 meters R nf = Near-Field Region 4λ 161 Meters AGL >Rnf 926.718 >meters R t = Transition Region <Rff 2224.123 <meters 0.6D2 2224.123 meters R ff = Far Field Region λ 386 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 464.603 mW/cm2 a Note 1 Note 2 4P >FCC MPE See >FCC MPE See 2 Antenna Surface 5.736 mW/cm2 A Note 1 Note 2 P >FCC MPE See 3 Main Reflector Ground 1.434 mW/cm2 <FCC MPE A Note 1 4η P >FCC MPE See 4 S nf =Near-Field Power Density 3.199 mW/cm2 <FCC MPE A Note 1 >FCC MPE See 5 S t = Max Transition Power Density < Snf 3.199 mW/cm2 <FCC MPE Note 1 PG >FCC MPE See 6 S ff = Max Far field Power Density 1.370 mW/cm2 <FCC MPE 4πRff2 Note 3 7 Off Access Level Near Field Snf - 20 dB 0.03199 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 2.5 meters above ground level at the minimum elevation angle which is not accessable to the general public. Generated 6/3/2017 2 of 2 rad haz auto report-tk-mod


Document Created: 2017-06-03 07:58:35
Document Modified: 2017-06-03 07:58:35
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