Attachment RadHaz

This document pretains to SES-MOD-20130522-00440 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2013052200440_997186

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 Fisher 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 66.05 dBW. The facility employs a AvL model 1200 USA 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 3.0 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.

du Treil, Lundin & Rackley, Inc. Consulting Engineers 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 = 0.70 P = power fed to antenna = 180,000 mW D = diameter of antenna = 120 cm and, therefore, Snf = 44.4 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 0.444 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 Paragraph 2 on Page 31 of OET Bulletin No. 65.

du Treil, Lundin & Rackley, Inc. Consulting Engineers Page 3 of 3 The FCC maximum permissible exposure (MPE) levels for the 14,000- 14,500 MHz (Ku Band) are 5 mW/cm2 for occupational / controlled environments and 1 mW/cm2 for general population / uncontrolled exposure. Thus, RF energy levels within and about the SNG vehicle at ground level will be well below the FCC MPE for general population / uncontrolled environments. Therefore, the proposed facility meets the requirements of Section 1.1307(b) concerning human exposure to RF energy. Work Rules for Control of RF Exposure All personnel must adhere to the following work rules for compliance with the FCC guidelines for human exposure RF energy during the operation of the SNG vehicle. 1. No personnel shall be on the roof of the SNG vehicle during the operation of the transmitting antenna. 2. All personnel shall remain inside the SNG vehicle or at ground level around the vehicle during the operation of the transmitting antenna. 3. No human beings shall be located within a forward distance of 590 feet (180 m) on the axis of the main beam of the transmitting antenna during its operation. Louis R. du Treil, Jr., P.E. du Treil, Lundin & Rackley, Inc. 201 Fletcher Ave. Sarasota, Florida 34237 (941)329-6000 May 15, 2013


Document Created: 2013-05-15 11:41:44
Document Modified: 2013-05-15 11:41:44
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