Attachment RadHaz.pdf

This document pretains to SES-LIC-20050404-00382 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005040400382_426050

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 WMBV in Dixon Mills, AL. This fixed earth station uplink is located at a lattitude of 32d - 07m - 45s North and a longitude of 87d - 44m - 16s West, in Dixon Mills, AL. 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: Prodelin 2.4 meter KU-band Antenna Diameter D 2.4. m Antenna Efficency η 67. % Transmitter: 4 watt output flange SSPA, operated at 50% power Transmit Power P 4. watt. 50. % mw watt P = 2 watt 1000 at 14.0 GHz at 14.5 GHz Antenna Gain G1 49.10 G2 49.30 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 = 67.2 m R n2 = 69.6 m Maximum Near Field Power Density 16. η. P Sn 2 π. D mw S n = 0.118 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 = 161.281 m R f2 = 167.04 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 = 0.05 S f2 = 0.049 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 = 69.6 m The end of the Transition Zone is the beginning of the Far Field - R t2 R f2 R t2 = 167.04 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 = 0.118 S t2 = 0.049 2 2 cm cm

Calculations at the Reflector Surface: (Page 3 of 3) 2 D Area of Reflector A π. 2 2 A = 4.524 m P Power Density at the S ref 2. Reflector Surface A mw S ref = 0.088 2 cm Calculations between the Antenna and the Ground: Power Density between P S ga Antenna and Ground A mw S ga = 0.044 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.


Document Created: 2005-03-31 14:41:00
Document Modified: 2005-03-31 14:41:00
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