Attachment Form 312 Exhibits B

This document pretains to SES-LIC-20080318-00321 for License on a Satellite Earth Station filing.

IBFS_SESLIC2008031800321_629894

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Diameter, (D) = 1.8 meters / 5.906 Feet Antenna Surface Area, (Sa) = 2.545 sq meters Subreflector Diameter, (Ds) = 0 centimeters KU Wavelength at 14.25 GHz (LAMBDA) = 0.0211 meters Power at output of VPC flange = 23.01 dB Path Loss to OMT (IL) = 0.2 dB Power at OMT, (P) = 191 Watts Antenna Gain at 14.250 GHz, (G)= 46.7 dBi (2 port antenna gain) Antenna Gain given in Power Ratio, (Ges) = 4.677E+04 Antenna Aperture Efficiency (N) = 0.698 Region Radiation Level Hazard Assessment Far Field, (Rf) = 92.133 meters / 302.287 Feet 8.375 mW/cm sq Potential Hazard Near Field, (Wf) = 38.389 meters / 125.953 Feet 20.962 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Potential Hazard Ru<Rt<Rf 20.962 mW/cm sq Rf ⋅ 3 . 281 = Between Main Reflector and N/A (no subreflector) Subreflector (Ws) Main Reflector Region (Wm) 15.012 mW/cm sq Potential Hazard Power Density Between Reflector 7.506 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 0.084 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) 0.21 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 that it is pointed at. 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 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 insure 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 stored ladder which will only be used when the transmitter is off and not accessible by the general public. Note: See Exhibit #Ba for how the above calculations were made.

Exhibit Ba Analysis of Non-Ionizing Radiation Antenna Diameter, (D ) = D := 1.8 meters D ⋅ 3.281 = 5.906 Feet D⋅D Antenna Surface Area, (Sa ) = Sa := π ⋅ Sa = 2.545 sq meters 4 Subreflector Diameter, (Ds ) = Ds := 0 cm Ds ⋅ .3937 = 0.000 Inches Ds ⋅ Ds Area of Subreflector, (As ) = As := π ⋅ As = 0.000 sq cm 4 Center Frequency, (Cf ) = Cf := 14.250 GHz Wavelength at (Cf ), (Lambda ) = Lambda := 0.0211 meters C-Band = .049 Ku-Band = .0211 Transmit Power at HPA or VPC Flange, (P1) = P1 := 200.00 watts P 2 := log( P1) ⋅ 10 P2 = 23.010 dB Path Loss from HPA or VPC to OMT, (IL) = Loss := 0.2 dB Power at OMT, (P )= P3 := P2 - Loss P3 = 22.810 OMT Pwr in dB P3 P := 10 10 P = 191.00 OMT Pwr in watts Antenna Gain at (Cf ), (Gain)= Gain := 46.70 dBi Gain Antenna Gain Converted to Power Ratio, (Ges )= Ges := 10 10 Ges = 4.677E+04 Ratio Antenna Aperture Efficiency, (n )= n := 0.6982 .60 ⋅ ( D ⋅ D ) Far Field (Rf )= Rf := Rf = 92.133 meters Lambda Rf ⋅ 3.281 = 302.29 feet Ges ⋅ P Far Field Power Density (Wf )= Wf := ⋅ .1 Wf = 8.375 mw sq cm 4 ⋅ π ⋅ ( Rf ⋅ Rf ) ( D ⋅ D) Near Field (Rn ) = Rn := Rn = 38.389 meters 4 ⋅ Lambda Rf ⋅ 3.281 = 125.953 feet 16 ⋅ n ⋅ P Near Field Power Density (Wn )= Wn := ⋅ .1 Wn = 20.962 mw sq cm π ⋅ ( D ⋅ D) Transition Region (Rt )= Rt := Wn ⋅ 1 Rt = 20.962 mw sq cm (Equal to or less than) 2⋅P Pwr Density at Sub Reflector (Ws )= Ws := ⋅ 1000 N/A As 2⋅ P Main Reflector Region Pwr Density (Wm )= Wm := ⋅ .1 Wm = 15.012 mw sq cm Sa P Pwr Density between main reflector and ground (Wg )= Wg := ⋅ .1 Wg = 7.506 mw sq cm Sa Far Field Off Axis (WF )= WF := Wf ⋅ .01 WF = 0.084 mw sq cm Near Field Off Axis (WN )= WN := Wn ⋅ .01 WN = 0.210 mw sq cm


Document Created: 2008-03-18 14:39:44
Document Modified: 2008-03-18 14:39:44
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