Attachment RAD HAZ

This document pretains to SES-LIC-20020722-01126 for License on a Satellite Earth Station filing.

IBFS_SESLIC2002072201126_266863

EXHIBIT A – Page 1of 4 RADIATION HAZARD STUDY SITE: State of South Dakota Temporary Fixed Earth Station APPLICANT: State of South Dakota

EXHIBIT A – Page 2 of 4 RADIATION HAZARD STUDY REGION RADIATION HAZARD ASSESSMENT LEVEL mw/cm2 Far Field, RF=41.14 0.161 Complies with guidelines meters Near Field, 0.424 “ “ “ RN=17.14meters Transition Region, RT 0.424 “ “ “ Rn<Rt<Rf Reflector Surface 0.177 “ “ “ Between Antenna and 0.00177 “ “ “ Ground Between Main Reflector 43.86 Potential Hazard and Feed CONCLUSION: Based on the above analysis it is concluded that harmful levels of radiation will not exist in regions normally occupied by the public or the earth station’s operating personnel. The earth station will be marked with the standard radiation hazard warnings, on the antenna itself, warning personnel to avoid the area in front of the reflector when the transmitter is operational. To ensure compliance with the safety limits, the earth station transmitter will be turned off whenever maintenance and repair personnel are required to work in an area where the radiation level exceeds the level recommended by applicable guidelines. Additionally, the earth station is secured and access is controlled.

EXHIBIT A – PAGE 3 OF 4 SUPPORTING CALCULATIONS REF: FCC BULLETIN #65 A. Far Field: 0.6 D 2 0.6 x(1.2) 2 = = 41.14 meters Rf= λ .021 PG 2 x1.710 4* S= = = 1.61W / m 2 4πR 2 4 x3.14(41.14) 2 S=0.161 mW/cm2 B. Near Field D2 (1.2) 2 Rn = = = 17.14 meters 4λ (4) x(.021) S=0.424mW/cm2 C. Transition Region: Since the transition extends between Rn and Rf the power density can never exceed the power density in the near field. S (nf ) xR(nf ) S= R D. Reflector Surface: Assuming an even distribution of energy over the surface of the dish: P 2 x10 3 S= = = .177 mW / cm 2 πr 2 π (60) 2

EXHIBIT A - PAGE 4 OF 4 E. Between Antenna and Ground: Nearest point is more than 1 diameter removed from the center of the main beam. S (reflector surface) S= = 0.0017mW / cm 2 100 F. Between Main Reflector and Feed: The diameter of the feed aperture is 7.62 cm. The highest density will be at the aperture. P 2 x10 3 S= = = 43.86 mW / cm 2 πr 2 π (3.81) 2


Document Created: 2002-07-24 08:55:51
Document Modified: 2002-07-24 08:55:51
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