Attachment Radiation Hazard Rep

This document pretains to SES-LIC-20171121-01269 for License on a Satellite Earth Station filing.

IBFS_SESLIC2017112101269_1306140

Radiation Hazard Analysis 0.85 Meter - Mountain View, California 94035 Introduction A radiation hazard anaylsis is presented for a 0.85 meter Ku band aperture antenna to be installed in Mountain View, California at the SES Networks Customer Facility. 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. The results of this is shown in Radiation Hazard Zones. The Table labeled Input Values provides the input data used 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 of the 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 2. Main Reflector 1.Subreflector 4.Near Field 5. Transition 6. Far Field 3. Main Reflector Ground 7.Off Axis Near Field Figure 1 – Analysis Zones Generated 11/21/2017 Page 1 of 1 Rad Haz Base file Ku-band

Radiation Hazard Analysis Operator: SES Networks Location Designation: Customer Facility FCC ID: County: Santa Clara SES ID: Town: Mountain View, STA: State/Zip: California 94035 Input Values Value Unit Band Frequency GHz D = Aperture Diameter 0.85 Meters L 1000-2000 d = Subreflector Diameter 0.1 Meters S 2000-4000 67% percentage C 4000-8000 FCC Designation Ku Band X 8000-12500 F = Frequency 14282 MHz Ku 12500-18000 P = Transmitter Power Watts: 20 Watts K 18000-25500 p = Number Transmitters: 1 Ka 26500-40000 R ua = closest point to uncontrolled area 20 meters O 40000-50000 Elevation angle at closest point R ua 41.4 Degrees V 50000-75000 OET 65 Calculated Values Formula Value Unit λ= Wavelength c/F 0.0210 meters P 1 = Total Antenna Input Power P*p 20 watts G = Antenna Gain 10817.01665 linear Antenna Gain dB 40.34107498 dBi A = Area of reflector 0.5671625 meters 2 a = area of subreflector 0.00785 meters 2 R nf = Near-Field Region 8.60 meters 8.598954167 >meters Transition Region 20.63749 <meters 20.63749 meters R ff = Far Field Region 14 Meters AGL Exposure Limits Radiation Analysis Zone Formula Level Value General Public Occupational 2 2 <1mW/cm <5mW/cm 2 >FCC MPE See >FCC MPE See 1 Power Subreflector 1019.108 mW/cm Note 1 Note 2 2 >FCC MPE See >FCC MPE See 2 Antenna Surface 14.105 mW/cm Note 1 Note 2 2 >FCC MPE See 3 Main Reflector Ground 3.526 mW/cm <FCC MPE Note 1 2 >FCC MPE See >FCC MPE See 4 Snf =Near-Field Power Density 18.901 mW/cm Note 1 Note 2 2 >FCC MPE See >FCC MPE See 5 Max Transition Power Density 18.901 mW/cm Note 1 Note 2 >FCC MPE See 6 Max Far field Power Density 4.044 mW/cm 2 Note 3 <FCC MPE 2 7 Off Access Level Near Field 0.18901 mW/cm <FCC MPE <FCC MPE Notes 1. The antenna is installed in a controlled location access is restricted to authorized personnel only. The area is 2. Inside the controlled area, MPE levels exceed the MPE exposure for occupational levels. The levels will be 3. The far field develops 14 meters above ground level at the minimum elevation angle which is not accessable to the Generated 11/21/2017 Page 1 of 1 Rad Haz Base file Ku-band


Document Created: 2017-11-21 15:57:22
Document Modified: 2017-11-21 15:57:22
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