Attachment RadiationHazardExB.p

This document pretains to SES-LIC-20050111-00029 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005011100029_412829

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Dia. (D)=1.8 Meters 5.906 Feet Antenna Surface Area (SA)=2.545 sq meters Subreflector Dia. (DS)=N/A (prime focus offset) Subreflector Surface Area (AS)=N/A KU Wavelength at 14.250 GHz (LAMBDA)=.0211 meters Power at output of HPA flange=22.553 dB Path Loss to OMT (IL)=.06 dB Power at OMT Flange (P)=156.773 watts Antenna Gain at 14.250 GHz (G)=46.7 dBi (4 port antenna gain) Antenna Gain given in Power Ratio (GES)=4.677E+04 Antenna Aperture Efficiency (N)=.6678 Region Radiation Level Hazard Assessment Far Field (Rf) 92.133 m 302.287 ft 6.874 mW/cm sq Potential Hazard Near Field (Wf) 38.389m 125.953 ft 16.457 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Potential Hazard Ru<Rt<Rf 16.457 mW/cm sq Between Main Reflector and N/A (no subreflector) Subreflector (Ws) Main Reflector Region (Wm) 12.322 mW/cm sq Potential Hazard Power Density Between Reflector 6.161 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) .069 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) .165 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 10 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 (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 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 Inch's Ds. Ds Area of Subreflector, (As)=............................. As π. As = 0 sq cm 4 Center Frequency, (Cf)=................................. CF 14.250 GHz Wavelenght at (Cf), (Lambda)=....................... Lambda .0211 meters C-Band=.049 Ku-Band=.0211 Transmit Power at HPA or VPC Flange, (P1)=.. P1 180 watts P2 log( P1) . 10 P2 = 22.553 dB Path Loss from HPA or VPC to OMT, (Loss)=.. Loss .6 dB P3 P2 Loss P3 = 21.953 OMT Pwr in dB Power at OMT, (P)=....................................... P3 10 P 10 P = 156.773 OMT Pwr in watts Antenna Gain at (Cf), (Gain)=.......................... Gain 46.7 dBi Gain Antenna Gain Converted to Power Ratio, (Ges). Ges 10 10 Ges = 4.677 10 4 Ratio Antenna Aperture Efficiency, (n)=..................... n .6678 _______________________________________________________________________________ .60. ( D. D ) Far Field (Rf)= Rf Rf = 92.133 meters Rf. 3.281 = 302.287 Feet Lambda Ges. P . Far Field Pwr Density (Wf)= Wf .1 Wf = 6.874 mw sq cm 4. π . ( Rf. Rf) D. D Near Field (Rn)= Rn Rn = 38.389 meters Rn. 3.281 = 125.953 Feet 4. Lambda 16. n . P . Near Field Pwr Density (Wn)= Wn .1 Wn = 16.457 mw sq cm π . ( D. D ) Transition Region (Rt)= Rt Wn . 1 Rt = 16.457 mw sq cm (Equal to or less then) Pwr Density at Sub Reflector (Ws)= (N/A No Sub Reflector) 2. P . Main Reflector Region Pwr Density (Wm)= Wm .1 Wm = 12.322 mw sq cm Sa P. Pwr Density between main reflector and ground (Wg)= Wg .1 Wg = 6.161 mw sq cm Sa Far Field Off Axis (WF)= WF Wf . .01 WF = 0.069 mw sq cm Near Field Off Axis (WN)= WN Wn . .01 WN = 0.165 mw sq cm


Document Created: 2005-01-11 08:15:09
Document Modified: 2005-01-11 08:15:09
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