Attachment RF Exposure Analysis

This document pretains to SES-MOD-20151222-00951 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2015122200951_1118268

FCC OET-65 RF Exposure Study - Satellite Uplink Facility KING 5.6 meter Digital Ku-band uplink – Calculation for worst case roof-top exposure FCC Maximum Permissible Exposure Levels Source Units Public/uncontrolled area exposure limit 47CFR §1.1310 1 mW/cm2 Occupational/controlled area exposure limit 47CFR §1.1310 5 mW/cm2 Input Data Antenna Diameter datasheet 560.0 cm Antenna surface area calculated 246301 cm2 Sub-reflector diameter measured 50.800 cm Sub-reflector area calculated 2027 cm2 Feed flange diameter measured 13.970 cm2 Feed flange area calculated 153 Frequency (entry) 14250 MHz Wavelength (speed of light = 299,792,458 m/s) calculated 2.104 cm Transmit power at flange Application 23600 milliwatts Antenna gain datasheet 56.66 dBi Antenna gain factor calculated 463447 Height of base of antenna above ground/roof measured 0.6 m Height of center of antenna above ground/roof measured 2.8 m Minimum Elevation Angle (entry) 9.7 degrees Minimum Elevation Angle calculated 0.16930 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 0.38 mW/cm Below FCC MPE Below FCC MPE Power density at subreflector Eq. 11 Pg 27 46.58 mW/cm2 Potential Hazard Potential Hazard Power density at feed flange Eq. 11 Pg 27 615.87 mW/cm2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 37266 cm Maximum near-field power density Eq. 13 Pg 28 0.25 mW/cm2 Below FCC MPE Below FCC MPE Aperture efficiency Eq. 14 Pg 28 0.66 Distance to beginning of far-field Eq. 16 Pg 29 89437.87 cm Power density at end of the transition regiion Eq. 17 Pg 29 0.11 mW/cm2 Below FCC MPE Below FCC MPE Maximum far-field power density Eq. 18 Pg 29 0.109 mW/cm2 Below FCC MPE Below FCC MPE Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 295.02 meters Height at minimum antenna elevation angle calculated 52.51 meters Horizontal distance calculated 290.8 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 131.94 meters Height at minimum antenna elevation angle calculated 25.03 meters Horizontal distance calculated 130.05 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 Maximum off-axis near field power density Eq. 13 Pg 28 0.0025 mW/cm2 Below FCC MPE Below FCC MPE Public/uncontrolled exposure off-axis distance Diam/or Eq 17 5.6 meters Occupatonal/controlled exposure off-axis distance Diam/or Eq 17 5.6 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) 5 degree(s) Off-axis antenna gain factor OET-65 Pg 30* 28 Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 ** 894.38 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. Prepared by Doug Lung, NBC Universal, December 14, 2015


Document Created: 2019-04-13 08:01:39
Document Modified: 2019-04-13 08:01:39
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