Attachment Hazard evaluation

This document pretains to SES-LIC-20101203-01492 for License on a Satellite Earth Station filing.

IBFS_SESLIC2010120301492_854840

VIETNAM INTERNATIPONAL NETWORK ASSOCIATION LLC. 2841 Rogers Drive, Falls Church, Virginia 22042 (O) 703-635-7799 (F) 703-730-3625 Radiation Hazard Evaluation This report is for propose satellite antenna for Vietnam International Network Association LLC. This antenna is located at 2841 Rogers Dr, Falls Church, Virginia 22042. 1 Earth Station Technical Parameters - Input Data 1 Antenna Diameter - Standard Parabola 1.8 meters 2 G = Antenna Isotropic Gain 46.8 dBi 3 h = Nominal Antenna Efficiency 65 Percent 4 Nominal Frequency 14.25 GHz 5 Maximum Transmit Power Amplifier Size 10 Watts 6 Number of Carriers 1 each 7 W/G Loss from Transmitter to Feed 0.5 dB 8 Multicarrier Fixed Backoff 3 dB 9 Desired Object Clearance Height 2 meters 2 Earth Station Technical Parameters - Calculated Data 10 A = Antenna Surface Area 2.54 sq meters 10 A Standard Parabolic Reflector 2.544690049 sq meters 10B Elliptical Reflector 0.00 sq meters 11 D = Effective Antenna Diameter 1.8 meters 12 Total Transmit Power 10 Watts 13 P = Total Feed Input Power (watts) 4.47 Watts 14 E = Maximum E/S EIRP - Calculated 53.30 dBW 15 λ = Wavelength (= c/f in m/GHz) 0.0210 m/GHz 16 p = Pi 3.14159 17 Rnf = Near Field Limit (D2/4λ) 39 meters 128 feet 18 Rff = Far Field Limit (Rff=0.6D2/λ ) 92 meters 302 feet 19 Rnf to Rff = Transition Region 39 to 92 meters 128 to 302 feet 3 Power Density at the Antenna Surface : Controlled Environment (less than 5 mW/cm2 in 6 minutes): SAFE Uncontrolled environment (less than 1 mW/cm2 in 30 minutes): SAFE 4 On-Axis Density in the Near Field Region Evaluation: Controlled Environment (less than 5 mW/cm2 in 6 minutes): SAFE

Uncontrolled environment (less than 1 mW/cm2 in 30 minutes): SAFE 5 On-Axis Power Density in the Transition Region Evaluation: Controlled Environment Safe Operating Distance, meters: 4 meters Uncontrolled environment Safe Operating Distance, meters : 18 meters 6 On-Axis Power Density in the Far Field Region Evaluation: Controlled Environment (less than 5 mW/cm2 in 6 minutes): SAFE Uncontrolled environment (less than 1 mW/cm2 in 30 minutes): SAFE 7 Off-Axis Power Density Levels at the Far Field Limit and Beyond Evaluation: Considering that satellite antenna beams are aimed skyward, power density in the far field will usually not be a problem except at low look angles. In these cases, off axis gain reduction techniques may be used to further reduce the power density levels. 8 Evaluation of Safe Occupancy Area in Front of the Antenna Safe distance for the following elevation angles (a): a - Elevation Angle 40 degree is 2.92 meters b - Elevation Angle 50 degree is 2.43 meters


Document Created: 2010-12-03 09:58:52
Document Modified: 2010-12-03 09:58:52
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