Attachment Exhibit_B

This document pretains to SES-LIC-20101013-01294 for License on a Satellite Earth Station filing.

IBFS_SESLIC2010101301294_844940

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Dia. (D)=1.2 Meters 3.937 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)=.0211 meters Power at output of HPA flange=18.451 dB Path Loss to OMT (IL)=.6 dB Power at OMT Flange (P)=60.967 watts Antenna Gain at 14.250 GHz (G)=43.5 dBi (2 port antenna gain) Antenna Gain given in Power Ratio (GES)=2.239E+04 Antenna Aperture Efficiency (N)=.6982 Region Radiation Level Hazard Assessment Far Field (Rf) 40.948 m 134.35 ft 6.478 mW/cm sq Potential Hazard Near Field (W1P) 17.062m 55.979 ft 15.055 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Potential Hazard Ru<Rt<Rf 15.055 mW/cm sq Between Main Reflector and N/A (no subreflector) Subreflector (Ws) Main Reflector Region (Wm) 10.781 mW/cm sq Potential Hazard Power Density Between Reflector 5.391 mW/em sq Potential Hazard and Ground Far Field Off Axis (WF) ..065 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) .151 mW/cem 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 (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—lonizing Radiation Antenna Diameter, (D)=.................c.c.ccscsckk e D:=1.2 meters D. 3.281 =3.937 Feet Antenna Surface Area, (Sa)= ........................ Sa ::n.@ Sa=1.131 sq meters 4 Subreflector Diameter, (Ds)=.......................... Ds :=0 ocm Ds—.3937 =0 Inch‘s . Ds—Ds Area of Subreflector, (AS)=...................lcl...}}.. As :=I As =0 sq cm Center Frequency, (Cf)=.................l.lcccceee}. 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 :=70 watts P2 :=log(P1)—10 P2=18.451 dB Path Loss from HPA or VPC to OMT, (Lossy=.. Loss :=.6 dB P3 :=P2—Loss P3 =17.851 OMT Pwr in dB Power at OMT , (P)=........22. 222. .ne2essseerecsseverees P3 P :=10"° P =60.967 OMT Puwr in watts Antenna Gain at (Cf), (Gain)=..............c.2ll.ll}. Gain :=43.5 dBi Gain Antenna Gain Converted to Power Ratio, (Ges). geg:=10 ‘° Ges=2.23910° Ratio Antenna Aperture Efficiency, (n)=..................... n :=.6982 Far Field (Rf)= Rf ::m Rf =40.948 meters Rf3.281 =134.35 Feet Lambda Far Field Pwr Density (WFf)= Wf ::—GCLP-—-.I Wf = 6.478 mw sq cm 4—1—(RFfRf) NearField (Rn)= Rn:=—*?— Rn=17.062 meters Rn3.281 =55.979 Feet 4 —Lambda Near Field Pwr Density (Wn)= Wn := 8P .1 wn=15.055 mw sq cm 1(DD) Transition Region (Rt)= Rt:=Wn—1 Rt=15.055 mw sq cm (Equal to or less then) Pwr Density at Sub Reflector (Ws)= (N/A No Sub Reflector) Main Reflector Region Pwr Density (Wm)= Wm :z?-.l Wm =10.781 mw sq cm a Pwr Density between main reflector and ground (Wg)= Wg ::Si-.l Wg =5.391 mw sq cm a Far Field Off Axis (WF)= WF := WFf—.01 WF =0.065 mw sq ocm Near Field Off Axis (WN)= WN := Wn—.01 WN =0.151 mw sq cm


Document Created: 2010-09-30 17:13:34
Document Modified: 2010-09-30 17:13:34
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC