Attachment Radiation Hazard

This document pretains to SES-MOD-20140723-00614 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2014072300614_1054101

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Diameter, (D) = 1.5 meters / 4.9215 Feet Antenna Surface Area (Sa) = 1.7671 sq meters Subreflector Diameter (Ds) = 0.0000 centimeters Ku Wavelength at 14.250 GHz (LAMBDA) = 0.21038067 meters Power output of VPC Flange= 20.000 dB Path Loss to OMT (IL) = 0.6 dB Power at OMT, (P) = 87.10 Watts Antenna Gain at 14.250GHz (G) = 45.90 dBi (2 port antenna gain) Antenna Gain given in Power Ration, (Ges) = 3.89E+04 Antenna Aperture Efficiency (N) = 0.670 Region Radition Level Hazard Assessment Far Field, (Rf) = 6.417 meters / 21.05 Feet 654.839 mW/cm sq Potential Hazard Near Field, (Wf) = 2.674 meters / 8.772 Feet 13.209 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Ru<Rt<Rf 13.209 mW/cm sq Potential Hazard Between Main Reflector N/A (no subreflector) and Subreflector (Ws) Main Reflector Region (Wm) 9.857 mW/cm sq Potential Hazard Power Density Between Reflector 4.929 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 6.548 mW/cm sq Potential Hazard Near Field Off Axis (WN) 0.132 mW/cm sq Meets ANSI Requirements Conclusion: Based on the above analysis, harmful areas of Radiation do exist in the 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 1mW 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 ensure 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 ladder that is not accessible by the general public. Note: See Exhibit #Ba for how the above calculations were made.

Exhibit Ba Analysis on Non-Ionizing Radiation Antenna Diameter, (D) = D: = 1.5 meters D*3.281 = 4.922 Feet Antenna Surface Area, (Sa) = Sa: = p* D*D Sa = 1.767 sq meters 4 Subreflector Diameter, (Ds) = Ds: = 0 cm Ds*.3937 0.000 Inches Ds*Ds Area of Subreflector, (As) = As: = p* As= 0.000 sq meters 4 Center Frequency, (Cf) = Cf: = 14.250 GHz Wavelength at (Cf), (Lambda) = Lambda = 0.2103806709 meters Tansmit Power at HPA or VPC Flange, (P1) = P1= 100.00 watts P2:=log(p1)*10 P2= 20.000 dB Path Loss from HPA or VPC to OMT, (IL) = Loss: = 0.6 P3:= P2-Loss P3= 19.400 OMT Pwr in dB P3 P:= 10 P= 87.096 OMT Pwr in watts 10 Antenna Gain at (Cf), (Gain) = Gain: = 45.90 dBi Gain Antenna Gain Converted to Power Ratio (Ges)= Ges: = 10 Ges = 3.89E+04 Ratio 10 Antenna Aperture Efficiency, (n) = n: = 0.6700 .60 * (D*D) Rf = 6.417 meters Far Field (Rf) = Rf= Lambda Rf*3.281= 21.054 feet Ges*P Far Field Power Density (Wf) = Wf= * .1 Wf = 654.839 mw sq cm 4* p * (Rf*Rf) (D*D) Rn= 2.674 meters Near Field (Rn) = Rn= 4*Lambda Rf*3.281= 8.772 feet 16*n*P Near Field Power Density (Wn) = Wn= * .1 Wn = 13.209 mw sq cm p* (D*D) mw sq cm Transition Region (Rt) = Rt = Wn*1 Rt= 13.209 (Equal to or less than) 2*P Pwr Density at Sub Reflector (Ws) = Ws= *1000 Ws = N/A As Main Reflector Region Pwr Density (Wm) = Wm= 2*P *.1 Wm = 9.857 mw sq cm Sa Pwr Density between main reflector and P Wg= *.1 Wg = 4.929 mw sq cm ground (Wg) = Sa Far Field Off Axis (WF) = WF:= Wf*.01 WF = 6.548 mw sq cm Near Field Off Axis (WN) = WN:= Wn*.01 WN = 0.132 mw sq cm

Form 312 Blocks Information Project number: 3056 Customer: News 12 Westchester Customer Contact: Chris Bacon Date: 7/15/2014 Enter this information in the following FCC Form 312 Blocks Nomenclature Value Unit of Measure Form 312 Block Power at OMT 87.096 watts B5(g) Total EIRP 65.30 dBw B5(h) Maximum EIRP Density toward the Horizon -5.00 dBw/4KHz B6(i) Maximum EIRP per Carrier 62.15 dBw B7(f) Maximum EIRP Density per Carrier 22.60 dBw/4KHz B7(g)

Variable Data Project number: 3056 Customer: News 12 Westchester Customer Contact: Chris Bacon Date: 7/15/2014 Required Data Antenna Model GD Satcom C150M Amplifier Model Advantech SSPBM-K100-CRE Antenna Diameter (D) 1.5 meters Subreflector Diameter (Ds) 0 cm Center Frequency (Cf) 14.250 GHz (14.250 GHz for Ku-Band) Transmit Power at HPA or VPC Flange (P1) 100.00 watts Path Loss from HPA or VPC to OMT (IL) 0.6 dB (0.6 for Hub Mount, 2.0 for Rack Mount) Anntena Gain at (Cf) (Gain) 45.90 dBi Anntena Aperture Efficiency (n) 0.67 Bandwidth of Transmission 9 MHz


Document Created: 2014-07-15 10:01:26
Document Modified: 2014-07-15 10:01:26
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