Attachment RF Hazard Study

This document pretains to SES-MOD-20110628-00752 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2011062800752_899273

FCC OET-65 RF Exposure Study - Satellite Uplink Facility NBC Universal Englewood Cliffs C-Band 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. Prepared by Doug Lung, NBC Universal, June 24, 2011


Document Created: 2019-04-13 17:59:27
Document Modified: 2019-04-13 17:59:27
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