Attachment WMAQ-MC9-1.2m_OET65_

This document pretains to SES-LIC-20120502-00413 for License on a Satellite Earth Station filing.

IBFS_SESLIC2012050200413_949216

FCC OET-65 RF Exposure Study - Satellite Uplink Facility
WMAQ-TV Digital Ku-band transportable uplink - “MC #9”

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                120.0 cm
Antenna surface area                                      calculated              11310 cm2
Sub-reflector diameter                                    measured          N/A          cm
Sub-reflector area                                        calculated        N/A          cm2
Feed flange diameter                                      estimated                5.400 cm2
Feed flange area                                          calculated                  23
Frequency                                                 (entry)                 14125 MHz
Wavelength (speed of light = 299,792,458 m/s)             calculated               2.122 cm
Transmit power at flange                                  Application            125000 milliwatts
Antenna gain                                              datasheet                 43.2 dBi
Antenna gain factor                                       calculated              20893
Height of base of antenna above ground                    measured                  2.91 m
Height of center of antenna above ground                  measured                  3.51 m
Minimum Elevation Angle                                   (entry)                      5 degrees
Minimum Elevation Angle                                   calculated            0.08727 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                44.21 mW/cm2      Potential Hazard       Potential Hazard
Power density at subreflector                          Eq. 11 Pg 27                     0 mW/cm2           N/A                    N/A
Power density at feed flange                           Eq. 11 Pg 27             21831.95 mW/cm2      Potential Hazard       Potential Hazard
Extent of near-field                                   Eq. 12 Pg 27                 1696 cm
Maximum near-field power density                       Eq. 13 Pg 28                29.28 mW/cm2      Potential Hazard             Potential Hazard
Aperture efficiency                                    Eq. 14 Pg 28                  0.66
Distance to beginning of far-field                     Eq. 16 Pg 29              4070.82 cm
Power density at end of the transition regiion         Eq. 17 Pg 29                  12.2 mW/cm2     Potential Hazard             Potential Hazard
Maximum far-field power density                        Eq. 18 Pg 29               12.541 mW/cm2      Potential Hazard             Potential Hazard

Main Beam Far-field region safe exposure distances
Minimum distance for public/uncontrolled exposure         Eq. 18 Pg 29            144.16 meters
   Height at minimum antenna elevation angle              calculated               16.07 meters
   Horizontal distance                                    calculated              143.61 meters

Minimum distance for occupational/controlled exposure     Eq. 18 Pg 29             64.47 meters
   Height at minimum antenna elevation angle              calculated                9.13 meters
   Horizontal distance                                    calculated               64.23 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               0.2928 mW/cm2      Below FCC MPE                Below FCC MPE
Public/uncontrolled exposure off-axis distance         Diam/or Eq 17                  1.2 meters
Occupatonal/controlled exposure off-axis distance      Diam/or Eq 17                  1.2 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 public/uncontrolled exposure    Eq. 18 Pg 29 **          40.71 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, April 10, 2012



Document Created: 2019-04-21 02:11:19
Document Modified: 2019-04-21 02:11:19

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