Attachment RadiationHazardAnaly

This document pretains to SES-LIC-20050426-00489 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005042600489_428784

RF RADIATION ANALYSIS Exhibit A Antenna Dia. (D) = 1.2 Meters 3.9372 Feet Antenna Surface Area (SA) = 1.131 sq meters Subreflector Dia. (DS) = N/A (prime focus offset) Subreflector Surface Area (AS) = N/A KU Wavelength at 14.250 GHz (Lambda) = 0.0211 meters Power at output of HPA flange = 17.782 dB Path Loss to OMT (IL) 0.48 dB Power at OMT Flange (P) = 53.722 watts Antenna Gain at 14.250 GHz (G) = 43.2 dBi Antenna Gain given in Power Ratio (GES)= 2.089E+04 Antenna Aperture Efficiency (N)= 0.6874 Region Radiation Level Hazard Assessment Far Field (Rf) 40.948 m 134.35 ft 5.327 mW/cm sq Potential Hazard Near Field (Wf) 17.062 m 55.979 ft 13.061 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Ru<Rt<Rf 13.061 mW/cm sq Potential Hazard Between Main Reflector N/A (no subreflector) and Subreflector (Ws) Main Reflector Region (Wm) 9.5 mW/cm sq Potential Hazard Power Density Between Reflector 4.75 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 0.053 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) 0.131 mW/cm sq Meets ANSI Requirements Conclusion: Based on the above analysis, harmful areas of radiation do exist in areas around the antenna and in the path of the antenna toward the satellite at which it is pointed. The area occupied by the general public will not exceed the ANSI limit of 1 mW cm sq. because the antenna is mounted on top of a building, which does not have access by the general public. The areas on the ground and behind the antenna are 100 times less power (20 dB) when at a min. of the dia. of the reflector, this is reflected in the Off Axis figures as seen above (WF) & (WN). The antenna area 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 insure that the antenna path is clear at all times while the transmitter is in operation. See Exhibit B for how the calculations were made

ANALYSIS OF NON-IONIZING RADIATION Exhibit B Antenna Diameter (D) D= 1.2 meters 3.937 Feet D⋅D Antenna Surface Area (Sa) Sa = π ⋅ Sa= 1.131 sq meters 4 Subreflector diameter (Ds) Ds=0 cm Ds = 0 inches Ds ⋅ Ds Area of Subreflector (As) As = π ⋅ As= 0 sq cm 4 Center Frequency (Cf) CF = 14.250 GHz Wavelength at (Cf), (Lambda) Lambda = 0.0211 meters C band=0.049, Ku band=0.0211m Transmit Power at HPA or VPC Flange (P1) P1= 60 watts P2 = log(P1) ⋅ 10 P2= 17.782 db Path Loss from HPA or VPC to OMT (Loss) Loss= 0.48 db Power at OMT (P) P3=P2-Loss P3= 17.302 db Antenna Gain at (Cf), (Gain) Gain= 43.2 dBi Gain Antenna Gain Converted to Power Ratio, (Ges). Ges = 10 10 Ges= 2.089E+04 Ratio Antenna Aperature Efficiency (n) 0.6874 0.60 ⋅ (D ⋅ D) Far Field (Rf) Rf = Rf= 40.948 meters Lambda Ges⋅ P Far Field Pwr Density (Wf) Wf = ⋅ 0.1 Wf= 5.327 mw sq cm 4 ⋅ π ⋅ (Rf ⋅ Rf) D ⋅D Near Field (Rn) Rn = Rn= 17.062 meters 4 ⋅ Lambda 16 ⋅ n ⋅ P Near Field Pwd Density (Wn) Wn = ⋅ 0.1 Wn= 13.061 mw sq cm π ⋅ (D ⋅ D) Transition Region (Rt) Rt = W n ⋅ 1 Rt= 13.061 mw sq cm (equal to or less than) Pwr Density at Sub Reflector (Ws) (N/A - No subreflector) 2 ⋅P Main Reflector Region Pwr Density (Wm) W m := ⋅ 0.1 Wm= 9.5 mw sq cm Sa P Pwr Density between main reflector and ground (Wg) W g := ⋅ 0.1 Wg= 4.75 mw sq cm Sa Far Field Off Axis (WF) WF= 0.053 mw sq cm W F := W f ⋅ 0.01 Near Field Off Axis (WN) WN= 0.131 mw sq cm W N := W n ⋅ 0.01


Document Created: 2005-04-26 13:59:13
Document Modified: 2005-04-26 13:59:13
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