Attachment KSAT RF Hazard Study

This document pretains to SES-LIC-20131210-01181 for License on a Satellite Earth Station filing.

IBFS_SESLIC2013121001181_1028512

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Diameter, (D) = 1.25 meters / 4.10125 Feet Antenna Surface Area (Sa) = 1.2272 sq meters Subreflector Diameter (Ds) = 0.0000 centimeters Ku Wavelength at 14.250 GHz (LAMBDA) = 0.21038067 meters Power output of VPC Flange= 20.969 dB Path Loss to OMT (IL) = 0.6 dB Power at OMT, (P) = 108.87 Watts Antenna Gain at 14.250GHz (G) = 43.40 dBi (2 port antenna gain) Antenna Gain given in Power Ration, (Ges) = 2.19E+04 Antenna Aperture Efficiency (N) = 0.650 Region Radition Level Hazard Assessment Far Field, (Rf) = 4.456 meters / 14.62 Feet 954.485 mW/cm sq Potential Hazard Near Field, (Wf) = 1.857 meters / 6.092 Feet 23.066 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Ru<Rt<Rf 23.066 mW/cm sq Potential Hazard Between Main Reflector N/A (no subreflector) and Subreflector (Ws) Main Reflector Region (Wm) 17.743 mW/cm sq Potential Hazard Power Density Between Reflector 8.872 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 9.545 mW/cm sq Potential Hazard Near Field Off Axis (WN) 0.231 mW/cm sq Meets ANSI Requirements Conclusion: Based on the above analysis, harmful areas of Radiation do exist in the areas around the antenna and in the path of the antenna toward the satellite that it is pointed at. The Area occupied by the general public will not exceed the ANSI limit of 1mW cm sq. because the antenna is mounted on top of the truck, which is at least 8 feet above the ground, and safety increases with look angles used by the Satellites in the United States on Dom. Sat. arch. The areas on the ground and behind the antenna are 100 times less power (20dB) when at a min. of the dia. of the reflector. This is reflected in the Off Axis figures as seen above (WF) & (WN). The SNG will be marked with the standard radiation hazard warnings, and on the antenna itself. The warning signs will warn personnel to avoid the area around and in front of the reflector when the transmitter is operating. To ensure compliance with safety limits, the earth station transmitter will be turned off and marked to remain off whenever maintenance and repair personnel are required to work in the areas of potential hazard as defined in the above study. Additionally, the earth station personnel will be trained to ensure that the antenna path is clear at all times while the transmitter is in operation. The only access to the roof of the truck is a ladder that is not accessible by the general public. Note: See Exhibit #Ba for how the above calculations were made.

Exhibit Ba Analysis on Non-Ionizing Radiation Antenna Diameter, (D) = D: = 1.25 meters D*3.281 = 4.101 Feet Antenna Surface Area, (Sa) = Sa: = D*D Sa = 1.227 sq meters p* 4 Subreflector Diameter, (Ds) = Ds: = 0 cm Ds*.3937 0.000 Inches Ds*Ds Area of Subreflector, (As) = As: = p* As= 0.000 sq meters 4 Center Frequency, (Cf) = Cf: = 14.250 GHz Wavelength at (Cf), (Lambda) = Lambda = 0.2103806709 meters Tansmit Power at HPA or VPC Flange, (P1) = P1= 125.00 watts P2:=log(p1)*10 P2= 20.969 dB Path Loss from HPA or VPC to OMT, (IL) = Loss: = 0.6 P3:= P2-Loss P3= 20.369 OMT Pwr in dB P3 P:= 10 P= 108.870 OMT Pwr in watts 10 Antenna Gain at (Cf), (Gain) = Gain: = 43.40 dBi Gain Antenna Gain Converted to Power Ratio (Ges)= Ges: = 10 Ges = 2.19E+04 Ratio 10 Antenna Aperture Efficiency, (n) = n: = 0.6500 .60 * (D*D) Rf = 4.456 meters Far Field (Rf) = Rf= Lambda Rf*3.281= 14.621 feet Ges*P Far Field Power Density (Wf) = Wf= * .1 Wf = 954.485 mw sq cm 4* p* (Rf*Rf) (D*D) Rn= 1.857 meters Near Field (Rn) = Rn= 4*Lambda Rf*3.281= 6.092 feet 16*n*P Near Field Power Density (Wn) = Wn= * .1 Wn = 23.066 mw sq cm p* (D*D) mw sq cm Transition Region (Rt) = Rt = Wn*1 Rt= 23.066 (Equal to or less than) 2*P Pwr Density at Sub Reflector (Ws) = Ws= *1000 Ws = N/A As 2*P Main Reflector Region Pwr Density (Wm) = Wm= *.1 Wm = 17.743 mw sq cm Sa Pwr Density between main reflector and P Wg= *.1 Wg = 8.872 mw sq cm ground (Wg) = Sa Far Field Off Axis (WF) = WF:= Wf*.01 WF = 9.545 mw sq cm Near Field Off Axis (WN) = WN:= Wn*.01 WN = 0.231 mw sq cm


Document Created: 2013-11-21 12:42:08
Document Modified: 2013-11-21 12:42:08
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