Attachment RADHAZ

This document pretains to SES-LIC-20140430-00327 for License on a Satellite Earth Station filing.

IBFS_SESLIC2014043000327_1044331

EXHHIBIT RF RADIATION HAZARD ANALYSIS Antenna Dia. (D) = 4.5 M Antenna Surface Area (SA) = 15.9 Sq M Wavelength at 6.175 GHz (2) = 0.0486 M Power at output of HPA flange (P2) =28.45 dBm Path Loss to OMT (IL) = 1.92 dB Power at OMT Flange (P) = 450 watts Antenna Gain at 6.175 GHz (G) = 46.4 dBi Antenna Gain given in Power Ratio (Ges) = 43,652 Antenna Aperture Efficiency (N) = 0.52 Region Distance Radiation Level Hazard Assessment Far Field (WF) (Rf) 250 m 2.5 mw/cm* Potenial Hazard Near Field (Wn) (Rn) 104 m 5.88 mw/icm* Potenial Hazard Transistion Region Rn<(Rt)<Rf <5.88 mw/icm* Potenial Hazard Main Reflector (Wm) 5.66 mw/icm* Potenial Hazard Power Density between 2.83 mw/cm* Potenial Hazard Reflector and Ground (Wg) Far Field Off Axis (WF) 0.025 mwicm* Meets ANSI Near Field Off Axis (WN) 0.059 mw/cm* Meets ANSI 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 %0 q 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 (20 dB) 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 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 not accessible by the general public. Note: See Exhibit #Ba for how the above calculations were made.

SXHIGI ANALYSIS OF NON—IONIZING RADIATION Antenna Diameter (D) = 4.5 M DZ Angtenna Surface Area (Sa) = ”[T} = 15.9 Sq M Center Frequency (Cf) = 6.175 GHz Wavelength at Center Frequency(2) = 0.0486 M Maximum Transmit Power in Watts (P1) = 700 W Maximum Transmit Power in dB (P2) = 10Log(P1) = 28.45 dBm WIG loss from Transmitter to Feed, (IL) = 1.92 dBm Total Feed Input Powerin dB (P3) = P2—Loss = 26.53 dBm Total Feed Input Power in Watts (P) = 10‘ = 450 W Antenna Isotropic Gain (G) = 46.4 dBi Antenna Gain Converted to Power Ratio (Ges) = 10%= 43,652 Antenna Nominal Efficiency (N) = 0.60 Far Field (RF) = 0—6&”——) =250 M 2 Far Field Power Density (WB = °x 0.1 = 2.5 mwiem* Ar(Rf)‘ Near Field (Rn) = % =104M 2 Near Field Power Density (Wn) = [%%1]0.1 = 5.88 mwiom*

Transistion Region (Rt) = Wn = 5.88 mwfcm* Main Reflector Region Power Density (Wm) = [zv" 80 ]0.1 = 5.66 mwicm* Power Density between Main Reflector and Ground (Wg) = [—}f—}o.l =2.83 mwiem* Sa Far Field Off Axis (WF) = WH(0.01) = 0.025 mwicm* Near Field Off Axis (WN) = Wn(0.01) = 0.059 mw/cm*


Document Created: 2014-04-24 16:22:39
Document Modified: 2014-04-24 16:22:39
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC