Attachment RadHaz

This document pretains to SES-LIC-20120308-00246 for License on a Satellite Earth Station filing.

IBFS_SESLIC2012030800246_943182

EXHIBIT A (Page 1 of 3) RADIATION HAZARD STUDY This radiation hazard study describes the R.F. radiation environment of the permanent fixed Ku-band uplink operated by Educational Media Foundation. This fixed earth station uplink is located at a lattitude of 38d - 48m - 56s North and a longitude of 121d - 16m - 41s West, in Rocklin, CA. This study is done to comply with the requirements of Section 1.1307(b) of the rules of the Federal Communications Commission. All calculations conform to the proceedures presented in OET Bulletin No. 65 for aperature antennas. Transmit antenna: ASC 4.5 meter KU-band R/T antenna Antenna Diameter D 4.5. m Antenna Efficency η 67. % Transmitter: 40 watt output flange SSPA Transmit Power P 40. watt mw watt P = 40 watt 1000 at 14.0 GHz at 14.5 GHz Antenna Gain G1 53.40 G2 53.80 Wavelength λ1 2.14285. cm λ2 2.06896. cm Calculations for the Near Field (Fresnel Region) Extent of the Near Field 2 2 D D R n1 R n2 4. λ 1 4. λ 2 R n1 = 236.251 m R n2 = 244.688 m Maximum Near Field Power Density 16. η. P Sn 2 π. D mw S n = 0.674 2 cm

Calculations for the Far Field (Fraunhofer Region) (Page 2 of 3) at 14.0 GHz at 14.5 GHz 2 2 0.6. D 0.6. D Distance to Far Field R f1 R f2 λ1 λ2 R f1 = 567.002 m R f2 = 587.252 m G1 G2 10 10 Absolute Gain of Antenna G a1 10 G a2 10 P. G a1 P. G a2 Maximum Far Field Power S f1 S f2 2 2 Density 4. π. R f1 4. π. R f2 mw mw S f1 = 0.217 S f2 = 0.221 2 2 cm cm Calculations for the Transition Zone The farthest point in the near field is the beginning of the transition zone - R t1 R n2 R t1 = 244.688 m The end of the Transition Zone is the beginning of the Far Field - R t2 R f2 R t2 = 587.252 m Beginning End S n. R n2 S n. R n2 Transition Zone Power Density S t1 S t2 R t1 R t2 mw mw S t1 = 0.674 S t2 = 0.281 2 2 cm cm

Calculations at the Reflector Surface: (Page 3 of 3) 2 D Area of Reflector A π. 2 2 A = 15.904 m P Power Density at the S ref 2. Reflector Surface A mw S ref = 0.503 2 cm Calculations between the Antenna and the Ground: Power Density between P S ga Antenna and Ground A mw S ga = 0.252 2 cm Conclusions The power densities in the Near Field, Far Field, Transition Zone, at the Surface of the Reflector, and between the Reflector and the Ground are all below the allowable limit. Nowhere do they exceed the level of 5 mw/cm2 as listed in OET Bulletin No. 65. Thus, this transmit earth terminal meets FCC requirements for human exposure to radio frequency energy.

EXHIBIT B (Page 1 of 3) ENVIRONMENTAL IMPACT STATEMENT Transmit/Receive In regard to Section 1.1307(a) of the Commission's rules: This site is not in a designated wilderness area or wildlife preserve; it does not threaten endangered species or critical habitats; nor does it affect sites, structures, or habitats which are significant in American history, architecture, archeology, engineering or culture that are listed or are eligible for listing in the National Registry of Historic Places; it does not affect Indian religious sites or flood plains; nor does it cause significant change in wetland fill, deforestation, or water diversion. In regard to section 1.1307(b) of the Commission's rules: We have prepared the calculations of radio frequency radiation for this transmitter and antenna combination, under the operating conditions specified in this application, with these results: Region Radiation level Hazard assessment (mw/cm 2) ________ ______________ _________________ Near field 0.674 Complies with guidelines Far field 0.217 Complies with guidelines Transition zone 0.674 Complies with guidelines At reflector surface 0.503 Complies with guidelines Between the rim of the 0.252 Complies with guidelines antenna and the ground

(Page 2 of 3) Conclusions: Based on the study, which is summarized above, we conclude that in the regions of concern, the radiation level complies with the guidance; the level is less than 5 milliwatts per square centimeter. Accordingly, this action does not have a significant environmental impact as described in the Commission's rules and does not require the preparation of an environmental assessment. Michael Kirk (name) Satellite Engineer (title or position) 01/22/12 (date)

(Page 3 of 3) It is the applicant's responsibility to ensure that the public and operational personnel are not exposed to harmful levels of radiation. Further Conclusions: Based on this analysis it is concluded that the FCC RF Guidelines have not been exceeded in the specific regions shown in this report. The applicant proposes to comply with the Maximum Permissible Exposure (MPE) limits of 1 mW/cm2 for the Uncontrolled areas, and the MPE limits of 5 mW/cm2 for the Controlled areas by one or more of the following methods: Means of Compliance Uncontrolled Areas: This antenna will be located in a secured area. This area will be sufficient to prohibit access by the general public to the areas that exceed the MPE limited. The general public will not have access to areas within ½ diameter removed from the edge of the antenna. Since one diameter removed from the main beam of the antenna, or ½ diameter removed from the edge of the antenna, the RF levels are reduced by a factor of 100 or 20 dB. None of the areas exceeding the MPE levels will be accessible by the general public. Radiation hazard signs will be posted while this earth station is in operation. The applicant will ensure that no buildings or other obstacles will be in the area that exceed the MPE levels. Means of Compliance Controlled Areas: The earth station’s operational personnel will not have access to the areas that exceed the MPE levels while the earth station is in operation. The transmitters will be turned off during antenna maintenance.

EXHIBIT C (Page 1 of 1) FAA INFORMATION The proposed 4.5 meter Ku band R/T antenna, which is the subject of this application, is a fixed earth station that will be operated from the ground. The maximum height of this antenna will be about 5.5 meters above the ground. Therefore since the proposed antenna does not extend more than 6 meters above the ground, notice to the FAA is not required pursuant to Section 17.4 of the Commission's rules.


Document Created: 2012-01-22 01:49:50
Document Modified: 2012-01-22 01:49:50
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC