Attachment RF Exposure Study

This document pretains to SES-MOD-20160721-00670 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2016072100670_1143988

FCC OET-65 RF Exposure Study - Satellite Uplink Facility NBC News Channel – Washington D.C. 3.7 meter Digital Ku-band uplink 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 370.0 cm Antenna surface area calculated 107521 cm2 Sub-reflector diameter measured 48.260 cm Sub-reflector area calculated 1829 cm2 Feed flange diameter measured 17.145 cm2 Feed flange area calculated 231 Frequency (entry) 14275 MHz Wavelength (speed of light = 299,792,458 m/s) calculated 2.100 cm Transmit power at flange Application 125000 milliwatts Antenna gain datasheet 54 dBi Antenna gain factor calculated 251189 Height of base of antenna above ground measured 32.2 m Height of center of antenna above ground measured 34.2 m Minimum Elevation Angle (entry) 10 degrees Minimum Elevation Angle calculated 0.17453 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 4.65 mW/cm Potential Hazard Below FCC MPE Power density at subreflector Eq. 11 Pg 27 273.34 mW/cm2 Potential Hazard Potential Hazard Power density at feed flange Eq. 11 Pg 27 2165.73 mW/cm2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 16297 cm Maximum near-field power density Eq. 13 Pg 28 3.81 mW/cm2 Potential Hazard Below FCC MPE Aperture efficiency Eq. 14 Pg 28 0.82 Distance to beginning of far-field Eq. 16 Pg 29 39112.01 cm Power density at end of the transition regiion Eq. 17 Pg 29 1.59 mW/cm2 Potential Hazard Below FCC MPE Maximum far-field power density Eq. 18 Pg 29 1.633 mW/cm2 Potential Hazard Below FCC MPE Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 499.86 meters Height at minimum antenna elevation angle calculated 121 meters Horizontal distance calculated 492.27 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 223.55 meters Height at minimum antenna elevation angle calculated 73.02 meters Horizontal distance calculated 220.15 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 0.0381 mW/cm2 Below FCC MPE Below FCC MPE Public/uncontrolled exposure off-axis distance Diam/or Eq 17 3.7 meters Occupatonal/controlled exposure off-axis distance Diam/or Eq 17 3.7 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) 10 degree(s) Off-axis antenna gain factor OET-65 Pg 30* 5 Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 ** 391.12 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, July 20, 2016


Document Created: 2019-04-25 11:09:02
Document Modified: 2019-04-25 11:09:02
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