Attachment RF Exposure Analysis

This document pretains to SES-MOD-20190507-00570 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2019050700570_1666029

FCC OET-65 RF Exposure Study - Satellite Uplink Facility NBC Universal Englewood Cliffs C-Band 9 meter Uplinks 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 900.0 cm Antenna surface area calculated 636173 cm2 Sub-reflector diameter measured 122.000 cm Sub-reflector area calculated 11690 cm2 Feed flange diameter measured 40.284 cm Feed flange area calculated 1275 cm2 Frequency (entry) 6175 MHz Wavelength (speed of light = 299,792,458 m/s) calculated 4.855 cm Transmit power at flange Application 1000000 milliwatts Antenna gain datasheet 53.7 dBi Antenna gain factor calculated 234423 Height of base of antenna above ground measured 0.1 m Height of center of antenna above ground measured 4.15 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 Maximum power density at antenna surface Eq. 11 Pg 27 6.29 mW/cm2 Potential Hazard Potential Hazard Power density at subreflector Eq. 11 Pg 27 342.18 mW/cm2 Potential Hazard Potential Hazard Power density at feed flange Eq. 11 Pg 27 3138.38 mW/cm2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 41710 cm Maximum near-field power density Eq. 13 Pg 28 4.35 mW/cm2 Potential Hazard Below FCC MPE Aperture efficiency Eq. 14 Pg 28 0.69 Distance to beginning of far-field Eq. 16 Pg 29 100104.25 cm Power density at end of the transition regiion Eq. 17 Pg 29 1.81 mW/cm2 Potential Hazard Below FCC MPE Maximum far-field power density Eq. 18 Pg 29 1.862 mW/cm2 Potential Hazard Below FCC MPE Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 1365.83 meters Height at minimum antenna elevation angle calculated 357.65 meters Horizontal distance calculated 1319.29 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 610.82 meters Height at minimum antenna elevation angle calculated 162.24 meters Horizontal distance calculated 590 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 0.0435 mW/cm2 Below FCC MPE Below FCC MPE Public/uncontrolled exposure off-axis distance Diam/or Eq 17 9 meters Occupatonal/controlled exposure off-axis distance Diam/or Eq 17 9 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 ** 1001.04 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. NOTE: Areas identified as “Potential Hazard” are secured by fence and locked gate or otherwise inaccessible to the public. Prepared by Doug Lung, NBC Universal, April 25, 2019


Document Created: 2019-05-27 14:22:18
Document Modified: 2019-05-27 14:22:18
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