Attachment RADHAZ SES-LIC-20121017-00935

Attachment RADHAZ

This document pretains to SES-LIC-20121017-00935 for License on a Satellite Earth Station filing.

IBFS_SESLIC2012101700935_971251

du Treil, Lundin & Rackley, Inc.
Consulting Engineers

ENGINEERING STATEMENT
RADIO FREQUENCY EXPOSURE EVALUATION
TEMPORARY FIXED EARTH STATION

This Engineering Statement was prepared on behalf of Weigel
Broadcasting Company, in support of an evaluation of the radio frequency (RF)
environment in the vicinity of the antenna of a temporary fixed earth station to be
employed for satellite news gathering (SNG). This statement details compliance with
Section 1.1307(b) of the FCC Rules concerning human exposure RF energy. This
statement also details the RF safety work rules for the safe operation of the proposed
SNG facility.

Background

The proposed facility will transmit in the Ku Band with a maximum EIRP
of 63.0 dBW. The facility employs a MotoSat model Messenger 1.2M 1.2-meter aperture
antenna, which is mounted on the rear roof of a cargo van. When operational, the antenna
center of radiation is located 3.8 m above ground.

Calculated RF Exposure Levels

Calculations of RF exposure were conducted pursuant to the FCC’s OET
Bulletin No. 65, Evaluating Compliance with FCC Guidelines for Human Exposure to
Radiofrequency Electromagnetic Fields. Personnel in proximity of the transmitting
antenna will be located inside the vehicle or around the outside of the vehicle at ground
level. Work rules, further detailed below, prohibit personnel to be on or near the roof of
the vehicle when the antenna is operational.

1

$du Treil, Lundin & Rackley, Inc. Consulting Engineers Radiation Hazard Statement Page 2 of 3 All areas near the antenna, inside the vehicle, or about the vehicle at ground level, are within the near field region of the antenna. Using Equation 13 of OET Bulletin 65, the maximum near field, on-axis, power density level in the main beam of the antenna is calculated as follows: 16P S nf  D 2 where,  = aperture efficiency = 0.62 P = power fed to antenna = 100,000 mW D = diameter of antenna = 120 cm and, therefore, Snf = 22.0 mW/cm2. At one antenna diameter distance (1.2 m) off-axis from the antenna main beam, the power density level would be at least a factor of 20 dB less than the equivalent value calculated in the main beam.* This gives an RF energy level of less than 0.22 mW/cm2 at 2 m above ground around the vehicle. Furthermore, RF energy levels at locations within the vehicle will be well attenuated below this level by the metallic skin of the vehicle. While electromagnetic wave diffraction will occur off the edges of the vehicle the diffraction levels will be attenuated significantly below the incident RF levels. * See ¶2 on Page 31 of OET Bulletin No. 65. 2$

Document Created: 2012-10-16 15:09:23
Document Modified: 2012-10-16 15:09:23