Attachment RadiationHazardStudy

This document pretains to SES-LIC-20041112-01680 for License on a Satellite Earth Station filing.

IBFS_SESLIC2004111201680_404921

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Dia. (D)=2.4 Meters 7.874 Feet Antenna Surface Area (SA)=4.524 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=13.979 dB Path Loss to OMT (IL)= .5 dB Power at OMT Flange (P)=22.281 watts Antenna Gain at 14.250 GHz (G)=47.6 dBi (2 port antenna gain) Antenna Gain given in Power Ratio (GES)=5.754E+04 Antenna Aperture Efficiency (N)=.6484 Region Radiation Level Hazard Assessment Far Field (Rf) 163.791 m 537.4 ft 0.38 mW/cm sq Meets ANSI Requirements Near Field (Wf) 68.246m 233.917 ft 1.277 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Potential Hazard Ru<Rt<Rf 1.277 mW/cm sq Between Main Reflector and N/A (no subreflector) Subreflector (Ws) Main Reflector Region (Wm) 0.985 mW/cm sq Meets ANSI Requirements Power Density Between Reflector 0.493 mW/cm sq Meets ANSI Requirements and Ground Far Field Off Axis (WF) 0.004 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) 0.013 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 building, which does 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. Note: See Exhibit #Ba for how the above calculations were made.

Exhibit Ba Analysis of Non-Ionizing Radiation Antenna Diameter, (D)=.................................. D 2.4 meters D. 3.281 = 7.874 Feet D. D Antenna Surface Area, (Sa)= ........................ Sa π. Sa = 4.524 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 25 watts P2 log( P1 ) . 10 P2 = 13.979 dB Path Loss from HPA or VPC to OMT, (Loss)=.. Loss .5 dB P3 P2 Loss P3 = 13.479 OMT Pwr in dB Power at OMT, (P)=....................................... P3 10 P 10 P = 22.281 OMT Pwr in watts Antenna Gain at (Cf), (Gain)=.......................... Gain 47.6 dBi Gain Antenna Gain Converted to Power Ratio, (Ges). Ges 10 10 Ges = 5.754 10 4 Ratio Antenna Aperture Efficiency, (n)=..................... n .6484 ___________________________________________________________________________________ .60. ( D. D ) Far Field (Rf)= Rf Rf = 163.791 meters Rf. 3.281 = 537.4 Feet Lambda Ges . P . Far Field Pwr Density (Wf)= Wf .1 Wf = 0.38 mw sq cm 4. π . ( Rf. Rf ) D. D Near Field (Rn)= Rn Rn = 68.246 meters Rn . 3.281 = 223.917 Feet 4. Lambda 16. n . P . Near Field Pwr Density (Wn)= Wn .1 Wn = 1.277 mw sq cm π . ( D. D ) Transition Region (Rt)= Rt Wn . 1 Rt = 1.277 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 = 0.985 mw sq cm Sa P. Pwr Density between main reflector and ground (Wg)= Wg .1 Wg = 0.493 mw sq cm Sa Far Field Off Axis (WF)= WF Wf. .01 WF = 0.004 mw sq cm Near Field Off Axis (WN)= WN Wn . .01 WN = 0.013 mw sq cm


Document Created: 2019-04-24 00:03:50
Document Modified: 2019-04-24 00:03:50
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