Attachment RadHazEXHIBIT.pdf

This document pretains to SES-LIC-20150122-00020 for License on a Satellite Earth Station filing.

IBFS_SESLIC2015012200020_1073856

RADIATION HAZARD EVALUATION EXHIBIT A For 2.4 Meter Earth Station Page 1 of 2 This Radiation Hazard Evaluation is based upon information provided by the satellite transmit antenna and modulator manufacturers and is calculated I.A.W. FCC OET Bulletin 65, Section 2 (Aperture Antennas) . Formulas used in calculating the power density for each "Region" of concern are from Section 2 of the OET Bulletin. The proposed facility is within the required ANSI Maximum Power Density Limits for such installation. REGION OET FORMULA FROM THIS SECTION USED Antenna Surface (11) Ssurtace = 4P/A 24/20 .43 = 1.17 Surface power density is 1.17 P = power fed to antenna (6 watts) A = physical area of the aperture antenna (2.4m) Near—Field Region (12) R.,;= D2/4A 5.76/.0844 = 68 .246m Extent of Near—Field is <_68 .246 (13) Sar = 1l6nP/mD‘ 96/18.09 = 5.31 (using 100% aperture efficiency for Worst—Case scenario) Near—Field power density = 5.31 Rpr = extent of near field Sir = maximum near—field power density D = maximum dimension of antenna (2.4m) A = wavelength (at 14.25GHz = .0211m) P = power fed to the antenna (6 watts) 1 = aperture efficiency (actual for this antenna 0.6) Transition Region (16) R:: = 0.6 D/A 3.456/.0211 = 163 .79m Any point of interest which falls between R,.; and Rr;g is located within the Transition Region The Transition Region is > 68 .246 and < 163.79.

EXHIBIT A Page 2 of 2 To determine the power density of any location within the Transition Region, use of the following formula should be used. (17) St = Sasg Rar/R Rrg = distance to beginning of far—field D = antenna diameter (2.4m) A= wavelength {at 14.25GHz = .0Zl1nm) St = power density in the transition region Sars = maximum power density for near—field ( formula 13 ) = extent of near—field ( formula 12 ) 3 F I 3 R = distance to point of interest Far—Field Region (18) S;s = PG/AnR (using the beginning of the R:r;g (163.79)) 6x49.2/4x3.14x163.792 or 295.2/336,949.18 = 0.00088 S;¢g = power density {on axis) P = power fed to antenna (6 watts) G = power gain of antenna in direction of interest (49.2) R = distance to the point of interest


Document Created: 2019-04-20 18:25:24
Document Modified: 2019-04-20 18:25:24
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