Attachment Attachment 1

This document pretains to SES-AMD-20120216-00175 for Amended Filing on a Satellite Earth Station filing.

IBFS_SESAMD2012021600175_939797

RF RADIATION HAZARD ANALYSIS Exhibit A Antenna Dia. (D) = 2.4 Meters (7.874 feet) Antenna Surface Area (SA) = 4.523893 meters2 Subreflector Dia. (DS) = 51.435 cm 20.25 inches Subreflector Surface Area (AS) = 2077.817 cm2 KU Wavelenght at 14.250 Ghz ( )= 0.0211 meters Power at output of VPC flange = 28.129 dB Path Loss to OMT (IL) = 1.1 dB Power at OMT Flange (P) = 504.561 watts Antenna Gain at 14.250 Ghz (G) = 49.4 dBi Antenna Gain given in Power Ratio (GES) = 0.87096E+05 Antenna Aperture Efficiency (N)=0.679 Region Radiation Level Hazard Assessment Far Field (RF) 163.79 m (537.368 ft) 13.035 mW/cm2 Potential Hazard Near Field (WF) 68.24 m (223.917 ft) 30.292 mW/cm2 Potential Hazard Transition Region (RT) 30.292 mW/cm2 Potential Hazard Ru<Rt<Rf Between Main Reflector and 485.664 mW/cm2 Potential Hazard Subreflector (WS) Main reflector Region (WM) 22.306 mW/cm2 Potential Hazard Power Density Between Reflector 11.153 mW/cm2 Potential Hazard and ground Conclusion: Based on the above analysis, harmful areas of Radiation do exist in areas around the antenna and in the path of the antenna pointed toward the satellite. The area occupied by the general public will not exceed the ANSI limit of 1.0 mW/cm2 because the antenna is mounted on top of the truck, which is at lease 10 feet above the ground, and safety increases with look angles used by the Satellites in the United States on Dom. Sat. Arch. 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. Therefore, the roof is not accessible to the general public. See Page 2 for calculations.

RF RADIATION HAZARD ANALYSIS Exhibit A Page 2 Analysis of Non-Ionizing Radiation Antenna Diameter, (D) = D = 2.4 meters (7.874 ft) Antenna Surface Area, (Sa) = Sa = D2/4 = 4.524 meters2 Subreflector Diameter, (Ds) = Ds = 51.435 cm (20.25 inches) Area of Subreflector, (As) = As = Ds2/4 = 2.078x103 cm2 Center Frequency, (Cf) = Cf = 14.250 GHz Wavelength at (Cf), ( ) = = 0.0211 meters C-Band=0.049 Ku-Band=0.0211 Transmit Power at HPA or VPC Flange, (P1) = P1=650 watts, P2=log(P1) *10 = 28.129 dB Path Loss from HPA or VPC to OMT, (Loss) = Loss = 1.1 dB P3=P2-Loss, P3=27.029, OMT Pwr in dB Power at OMN, (P) = P = 10P3/10= 504.561, OMT Pwr in watts Antenna Gain at (Cf), (Gain) = Gain = 49.4 dBi Antenna Gain Converted to Power Ratio, (Ges) = Ges = 10Gain/10=8.71x104, Ratio Antenna Aperture Efficiency, (n) = n = 0.679 Far Field (Rf) = Rf = 0.60 (D2)/ = 163.791 meters (537.4 ft) Far Field Pwr Density (Wf) = Wf = [Ges x P/4 (Rf2)] x 0.1 = 13.035 mw/cm2 Near Field (Rn) = Rn = D2/4 = 68.246 meters (223.917 ft) Near Field Pwr Density (Wn) = Wn = [(16 x n x P)/ D2 ]x0.1=30.292 mw/cm2 Transition Region (Rt) = Rt 30.292 mw/cm2 Pwr Density at Sub Reflector (Ws) = Ws = [(2 x P)/As] x 1000 = 485.664 mw/cm2 Main Reflector Region Pwr Density (Wm) = Wm = [(2 x P)/Sa] x 0.1 = 22.306 mw/cm2 Pwr Density between main reflector and ground (Wg) = Wg =[P/Sa] x 0.1 = 11.153 mw/cm2

6.46 METERS FIGURE 1 KTVX(TV) SALT LAKE CITY, UTAH 5.26 METERS ° °


Document Created: 2012-02-08 11:08:20
Document Modified: 2012-02-08 11:08:20
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