Attachment nexstar rf rad haz s

nexstar rf rad haz s

EXHIBIT

rf rad study from previous license SES-LIC-20031005-01372

2019-02-26

This document pretains to SES-LIC-20190211-00094 for License on a Satellite Earth Station filing.

IBFS_SESLIC2019021100094_1628982

WTNH Broadcasting, Inc. FCC From 312, Exhibit B RF RADIATION HAZARD ANALYSIS Antenna Diameter (D) =1.2 Meters 3.937 Feet Antenna Surface Area (SA) =1.131 sq meters Subreflector Diameter (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 VPC flange =20.969 dB Path Loss to OMT (IL) =.6 dB Power at OMT Flange (P) =108.87 watts Antenna Gain at 14.250 GHz (G) =43.5 dBi (4 port antenna gain) Antenna Gain given in Power Ratio (GES) =2.239E+04 Antenna Aperture Efficiency (N) =.7233 Region Radiation Level Hazard Assessment Far Field (Rf) 40.948 m 134.35 ft 11.567 mW/cm sq Potential Hazard 27.851 mW/cm sq Potential Hazard Near Field (Wf) 17.062m 55.979 ft Transition Region (Rt) equal to or less than Ru<Rt<Rf 27.851 mW/cm sq Potential Hazard Between Main Reflector and Subreflector (Ws) N/A (no subreflector) Main Reflector Region (Wm) 19.253 mW/cm sq Potential Hazard 9.626 mW/cm sq Potential Hazard Power Density Between Reflector and Ground Far Field Off Axis (WF) . 116 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) . 279 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 the truck, which is at least 10 feet above the ground, and safety increases with look angles used by the Satellites in the United States on Domestic Satellite arch. FCC Form 312, Exhibit B Page 2

The areas on the ground and behind the antenna are 100 times less power (20 dB) when at a mininimum of the diaameter 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 is not accessible by the general public. Note: See Exhibit #Ba for how the above calculations were made.

Exhibit Ba Analysis of Non-Ionizing Radiation Antenna Diameter, (D)=.................................. 1.2 D meters D 3.281. = 3.937 Feet . . DD 4 Antenna Surface Area, (Sa)= ........................ Sa π Sa = 1.131 sq meters 0 Subreflector Diameter, (Ds)=.......................... . Ds cm Ds .3937. =0 . DsDs Inch's 4 14.250 Area of Subreflector, (As)=............................. Lambda As π As = 0 sq cm P1 125 watts Center Frequency, (Cf)=................................. CF GHz Loss .6 dB Wavelenght at (Cf), (Lambda)=....................... .0211 meters C-Band=.049 Ku-Band=.0211 P2 Loss P3 Transmit Power at HPA or VPC Flange, (P1)=.. 10 P2 log()P1 10. P2 = 20.969 dB 10 Path Loss from HPA or VPC to OMT, (Loss)=.. Gain 43.5 P3 P3 = 20.369 OMT Gain Pwr in dB 10 Power at OMT, (P)=....................................... 10 .7233 P P = 108.87 OMT Pwr in watts Antenna Gain at (Cf), (Gain)=.......................... dBi Antenna Gain Converted to Power Ratio, (Ges). Ges Ges = 2.239 104 Ratio Antenna Aperture Efficiency, (n)=..................... n _________________________________________________________________________________ Far Field (Rf)= Rf .60 (. D D. ) Rf = 40.948 meters Rf 3.281.= 134.35 Feet Lambda Ges P. Far Field Pwr Density (Wf)= Wf ..1 Wf = 11.567 mw sq cm 4.π.(Rf Rf.) D D. Near Field (Rn)= Rn Rn = 17.062 meters Rn 3.281. = 55.979 Feet 4.Lambda 16.n P. Near Field Pwr Density (Wn)= Wn ..1 Wn = 27.851 mw sq cm π.(D D. )

Transition Region (Rt)= Rt Wn 1. Rt = 27.851 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 = 19.253 mw sq cm Sa P ..1 Wg = 9.626 mw sq cm Pwr Density between main reflector and ground (Wg)= Wg Sa Far Field Off Axis (WF)= WF Wf .01. WF = 0.116 mw sq cm Near Field Off Axis (WN)= WNWn .01. WN = 0.279 mw sq cm


Document Created: 2019-02-26 11:55:03
Document Modified: 2019-02-26 11:55:03
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