Attachment E030086UPDATERADHAZ.

E030086UPDATERADHAZ.

SUPPLEMENT submitted by CBS COMMUNICATIONS SERVICES INC.

UDATED RADIATION HAZARD STUDY

2011-09-09

This document pretains to SES-MOD-20110819-00971 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2011081900971_916116

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) = 0.0211 meters Power output of VPC Flange= 20.969 dB Path Loss to OMT (IL) = 0.6 dB Power at OMT, (P) = 108.87 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) = 0.650 Region Radition Level Hazard Assessment Far Field, (Rf) = 63.981 meters / 209.92 Feet 8.234 mW/cm sq Potential Hazard Near Field, (Wf) = 26.659 meters / 87.467 Feet 16.018 mW/cm sq Potential Hazard Transition Region (Rt) equal to or less than Ru<Rt<Rf 16.018 mW/cm sq Potential Hazard Between Main Reflector N/A (no subreflector) and Subreflector (Ws) Main Reflector Region (Wm) 12.322 mW/cm sq Potential Hazard Power Density Between Reflector 6.161 mW/cm sq Potential Hazard and Ground Far Field Off Axis (WF) 0.082 mW/cm sq Meets ANSI Requirements Near Field Off Axis (WN) 0.160 mW/cm sq Potential Hazard 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. becuase 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.


Document Created: 2011-09-09 15:38:52
Document Modified: 2011-09-09 15:38:52
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