Attachment Hazard Study

This document pretains to SES-MOD-20170809-00896 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017080900896_1259469

FCC OET-65 RF Exposure Study - Satellite Uplink Facility 4226-TWC-KC FCC Maximum Permissible Exposure Levels Source Units 2 Public/uncontrolled area exposure limit 47CFR §1.1310 1 mW/cm 2 Occupational/controlled area exposure limit 47CFR §1.1310 5 mW/cm Input Data Antenna Diameter datasheet 150.0 cm 2 Antenna surface area calculated 17671 cm Sub-reflector diameter measured N/A cm Sub-reflector area calculated N/A cm2 2 Feed flange diameter measured 7.300 cm Feed flange area calculated 42 Frequency (entry) 14125 MHz Wavelength (speed of light = 299,792,458 m/s) calculated 2.122 cm Transmit power at flange Application 108870 milliwatts Antenna gain datasheet 45 dBi Antenna gain factor calculated 31623 Height of base of antenna above ground measured 2.921 m Height of center of antenna above ground measured 2.171 m Minimum Elevation Angle (entry) 15 degrees Minimum Elevation Angle calculated 0.26180 radians FCC Maximum Permissible Exposure (MPE) Results calculated using FCC Bulletin OET-65 (Edition 97-01 August 1997) Uncontrolled Controlled 2 Maximum power density at antenna surface Eq. 11 Pg 27 24.643127 mW/cm Potential Hazard Potential Hazard Power density at subreflector Eq. 11 Pg 27 0 mW/cm 2 N/A N/A Power density at feed flange Eq. 11 Pg 27 10404.7731 mW/cm 2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 2650 cm Maximum near-field power density Eq. 13 Pg 28 16.0180325 mW/cm 2 Potential Hazard Potential Hazard Aperture efficiency datasheet 0.65 Distance to beginning of far-field Eq. 16 Pg 29 6360.65034 cm Power density at end of the transition region Eq. 17 Pg 29 6.67418022 mW/cm 2 Potential Hazard Potential Hazard Maximum far-field power density Eq. 18 Pg 29 6.772 mW/cm 2 Potential Hazard Potential Hazard Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 165.519505 meters Height at minimum antenna elevation angle calculated 45.0106003 meters Horizontal distance calculated 159.879565 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 74.0225731 meters Height at minimum antenna elevation angle calculated 21.3294517 meters Horizontal distance calculated 71.500315 meters Off-Axis Near Field/Transition Region safe exposure distances from antenna (20 dB reduction in power density at distances greater than one antenna diameter from the main beam center.) OET-65 Pg 30 2 Maximum off-axis near field power density Eq. 13 Pg 28 0.1602 mW/cm Below FCC MPE Below FCC MPE Public/uncontrolled exposure off-axis distance Diam/or Eq 17 1.5 meters Occupatonal/controlled exposure off-axis distance Diam/or Eq 17 1.5 meters Off-Axis Far Field safe exposure distances from the antenna (Based on side lobe attenuation required by FCC 25.209(a)(2)) Angle off main beam axis (1 to 48 degrees) (entry) 15 degree(s) Off-axis antenna gain factor OET-65 Pg 30* 2 Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 ** 63.6065034 meters * Gain converted from dBi to linear multiple ** If calculated distance is less than the start of the far field region, the distance to the start of the far field region is used.


Document Created: 2017-05-26 11:59:26
Document Modified: 2017-05-26 11:59:26
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