Attachment FCC-OET65-RF-Exposur

This document pretains to SES-LIC-20180214-00113 for License on a Satellite Earth Station filing.

IBFS_SESLIC2018021400113_1337823

FCC OET-65 RF Exposure Study - Satellite Uplink Facility NBC Digital Ku-band transportable uplink - “Cowboy-Jr” Antenna Vendor/Model AVL 1810K Antenna Size: 1.8m Amplifier Make/Model: CPI-400W Amplifier Power at output flange: 350w. Feed Flange Power after system loss of 0.25 dB 330.4w 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 180.0 cm Antenna surface area calculated 25447 cm2 Feed flange diameter estimated 7.303 cm2 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 330400 milliwatts Antenna gain datasheet 46.5 dBi Antenna gain factor calculated 44668 Height of base of antenna above ground measured 3.51 m Height of center of antenna above ground measured 4.29 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 Maximum power density at antenna surface Eq. 11 Pg 27 51.94 mW/cm2 Potential Hazard Potential Hazard Power density at feed flange Eq. 11 Pg 27 31554.92 mW/cm2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 3816 cm Maximum near-field power density Eq. 13 Pg 28 32.68 mW/cm2 Potential Hazard Potential Hazard Aperture efficiency Eq. 14 Pg 28 0.63 Distance to beginning of far-field Eq. 16 Pg 29 9159.34 cm Power density at end of the transition regiion Eq. 17 Pg 29 13.62 mW/cm2 Potential Hazard Potential Hazard Maximum far-field power density Eq. 18 Pg 29 13.999 mW/cm2 Potential Hazard Potential Hazard Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 342.7 meters Height at minimum antenna elevation angle calculated 63.8 meters Horizontal distance calculated 337.49 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 153.26 meters Height at minimum antenna elevation angle calculated 30.9 meters Horizontal distance calculated 150.93 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 0.3268 mW/cm2 Below FCC MPE Below FCC MPE Public/uncontrolled exposure off-axis distance Diam/or Eq 17 1.8 meters Occupatonal/controlled exposure off-axis distance Diam/or Eq 17 1.8 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 ** 91.59 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, NBCUniversal, February 12, 2018


Document Created: 2019-04-12 21:57:59
Document Modified: 2019-04-12 21:57:59
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