Attachment Rad.Haz.Report

This document pretains to SES-LIC-20171031-01222 for License on a Satellite Earth Station filing.

IBFS_SESLIC2017103101222_1297919

Radiation Hazard Analysis 7.3 Meter South Mountain, Somis, California 93066 Introduction A radiation hazard anaylsis is presented for a 7.3 meter C band aperture antenna to be installed in South Mountain, SomisCalifornia at the SES,SM-C1. 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 10/30/2017 1 of 2 rad haz auto report-tk-mod-sm

Radiation Hazard Analysis Operator: SES, Location Designation: SM-C1 FCC Callsign: County: Ventura SES ID: Town: South Mountain, Somis STA: State/Zip: California 93066 Input Values Value Unit Band Frequency D = Aperture Diameter 7.30 Meters L 1000-2000 d = Subreflector Diameter 0.9 Meters S 2000-4000 G = Antenna Gain 51.8 dBi C 4000-8000 FCC Designation C Band X 8000-12500 F = Frequency 6.125 GHz Ku 12500-18000 P = Transmitter Power Watts: 1000 Watts K 18000-25500 R ua = closest point to uncontrolled area 50 meters Ka 26500-40000 Elevation angle at closest point R ua 5.48 Degrees O 40000-50000 Height (AGL) 2.00 meters V 50000-75000 OET 65 Calculated Values Formula Value Unit c λ= Wavelength 0.0489 meters F (G/10) G = Antenna Gain 10 151356.1248 (W) linear 2 Gλ /4π η = Apperture Efficiency 69% percentage πD2/4 A = Area of reflector πR2 41.854 meters 2 πr 2 2 a = area of subreflector 6361.725 cm 2 D 272.182 meters R nf = Near-Field Region 4λ 26 Meters AGL >Rnf 272.182 >meters R t = Transition Region <Rff 653.238 <meters 0.6D2 653.238 meters R ff = Far Field Region λ 62 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 628.760 mW/cm2 a Note 1 Note 2 4P >FCC MPE See >FCC MPE See 2 Antenna Surface 9.557 mW/cm2 A Note 1 Note 2 P >FCC MPE See 3 Main Reflector Ground 2.389 mW/cm2 <FCC MPE A Note 1 4η P >FCC MPE See >FCC MPE See 4 S nf =Near-Field Power Density 6.589 mW/cm2 A Note 1 Note 2 >FCC MPE See >FCC MPE See 5 S t = Max Transition Power Density < Snf 6.589 mW/cm2 Note 1 Note 2 PG >FCC MPE See 6 S ff = Max Far field Power Density 2.823 mW/cm2 <FCC MPE 4πRff2 Note 3 7 Off Access Level Near Field Snf - 20 dB 0.06589 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 meters above ground level at the minimum elevation angle which is not accessable to the general public. Generated 10/30/2017 2 of 2 rad haz auto report-tk-mod-sm


Document Created: 2017-10-30 15:50:29
Document Modified: 2017-10-30 15:50:29
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