Attachment SURFBOY-Uplink-RF_Ex

This document pretains to SES-LIC-20090218-00188 for License on a Satellite Earth Station filing.

IBFS_SESLIC2009021800188_696220

FCC OET-65 RF Exposure Study - Satellite Uplink Facility NBC "Surfboy" satellite news gathering truck with Vertex 1.8m SMK-LT antenna 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 Sub-reflector diameter measured N/A cm Sub-reflector area calculated N/A cm2 Feed flange diameter measured 8.855 cm Feed flange area calculated 62 Frequency (entry) 14250 MHz Wavelength (speed of light = 299,792,458 m/s) calculated 2.104 cm Transmit power at flange Application 400000 milliwatts Antenna gain datasheet 45.9 dBi Antenna gain factor calculated 38905 Height of base of antenna above ground measured 3.48 m Height of center of antenna above ground measured 4.98 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 62.8760269 mW/cm2 Potential Hazard Potential Hazard Power density at subreflector Eq. 11 Pg 27 N/A mW/cm2 Power density at feed flange Eq. 11 Pg 27 25980.827 mW/cm2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 3850 cm Maximum near-field power density Eq. 13 Pg 28 33.8572759 mW/cm2 Potential Hazard Potential Hazard Aperture efficiency Eq. 14 Pg 28 0.53847671 Distance to beginning of far-field Eq. 16 Pg 29 9240.39257 cm Power density at end of the transition region Eq. 17 Pg 29 14.1071983 mW/cm2 Potential Hazard Potential Hazard Maximum far-field power density Eq. 18 Pg 29 14.503 mW/cm2 Potential Hazard Potential Hazard Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 351.904697 meters Height at minimum antenna elevation angle calculated 96.0596377 meters Horizontal distance calculated 339.913835 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 157.376565 meters Height at minimum antenna elevation angle calculated 45.7120522 meters Horizontal distance calculated 152.014088 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 0.3386 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) 15 degree(s) Off-axis antenna gain factor OET-65 Pg 30* 2 Minimum distance for uncontrolled MPE limit calculated 2.40608513 meters Not valid if distance less the start of the far field Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 ** 92.4039257 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, 02/10/2009


Document Created: 2009-02-18 09:29:45
Document Modified: 2009-02-18 09:29:45
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