Attachment SESMOD2018051600627R

SESMOD2018051600627R

DECISION submitted by STATE OF NEW YORK

RAD HAD

0000-00-00

This document pretains to SES-MOD-20180516-00627 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2018051600627_1398508

RF RADIATION HAZARD ANALYSIS Exhibit #B Antenna Diameter, (D) = 1.2 meters / 3,9372 Feet Antenna Surface Area (Sa) = 1.1310 sq meters Subreflector Diameter (Ds) = 0.0000 centimeters Ku Wavelength at 14.250 GHz (LAMBDA} = 0.02103807 meters Power output of VPC Flange= 20.000 d8 Path Loss to OMT (IL) = 0.6 aB Power at OMT, (P) = 87.10 Watts Antenna Gain at 14.250GHz (G) = 43.30 dBi (2 port antenna gain) Antenna Gain given in Power Ration, (Ges) = 2.146+04 Antenna Aperture Efficiency (N) = 0.650 Region Radition Level Hazard Assessment Far Field, (Rf) = 41.068 meters / 134.75 Feet 8.786 mW/cm sq Potential Hazard Near Field, (Wf) = 17.112 meters / 56.144 Feet 20.023 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Ru<Rt<Rf 20.023 mW/cm sq Potential Hazard Between Main Reflector N/A (no subreflector) and Subreflector (Ws) Main Reflector Region (Wm) 15.402 mW/cm sq Potential Hazard Power Density Between Reflector 7.701 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 0.088 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) 0.200 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 (20d8) 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—lonizing Radiation Antenna Diameter, (D]= ___D.= 12 meters brszei= 3937 reet Antenna Surface Area, (Sa)= Sa:= 7 * Sas 431 sq meters Subreflector Diameter, (Ds)=___Ds:= 0 cm bs" 3037 0000 —inches Srex of ubrefieion (asls aaie on _0_54_05_ As= —0.000 sqmerers Center Frequency, (C) = ¢ 5 14.250 GHz Wavelength at (CF), (Lambda) = Lambda= 00210380671 meters Tansmit Power at HPA or VPC Flange, (P1) = P1= 100.00 watts P2:=log{p1)10 p2= 20.000 as Path Loss from HPA or VPC to OMT, (1L) = Loss:= 0.6 P3:= P2—Loss p3= 19.400 OMT Purin dB p= 10 + p= 87.096 OMT Pur in watts Antenna Gain at (C1), (Gain) = Gain:= 4330 ob Antenna Gain Converted to Power Ratio (Ges)= Ges:= 10 fg‘"— Ges= 214604 Ratio Antenna Aperture Efficiency, (n}=__n= 0.6500 iwfsi@h— We 60— (o°D) __Ri= arose meters Lambda asrgi= 134 745 feet Far Field Power Density (W) = Wi=>, Ges*P ——C5——— 5 1 wih= 8786 mw sq em an n (Reern Near Fiekd (Rn] s fns (ot0) Rn= 17112 meters 4"tambda ap3rgi= s6.144 feet Near Field Power Density (Wn) = 16n*r Wn= ———*2—2——————— z a wn= 20.023 mw sq em T (D"D) mw sq em Transition Region (Rt) = Rt= wn*i Re 20023 (Equal to or less than) Pwr Density at Sub Reflector (We)= Wez 2P ——*——— ©1000 we= N/A As Main Reflector Region Pwr Density (Wm) = Wim= + +1 Wim= 15.402 m sq em a Pwr Density between main reflector and wl p ma m nespms ground (we) = 5o Far Field Off Axis (WF) = __WF= wir on wr= o.o8s mw sq cm Near Field Off Zods (WN) = WN:= wn.o1 wn= 0200 mw sq cm


Document Created: 2018-05-17 15:36:42
Document Modified: 2018-05-17 15:36:42
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