Attachment RAD HAZ 4.5 meter KU

This document pretains to SES-LIC-20041223-01880 for License on a Satellite Earth Station filing.

IBFS_SESLIC2004122301880_411115

EXHIBIT A – Page 1of 4 RADIATION HAZARD STUDY SITE: McClelland Iowa APPLICANT: SCOLA

EXHIBIT A – Page 2 of 4 RADIATION HAZARD STUDY REGION RADIATION HAZARD ASSESSMENT LEVEL mw/cm2 Far Field, RF= 578 meters 3.1 Complies with guidelines Near Field, RN=240 meters 0.604 “ “ “ Transition Region, RT <0.604 “ “ “ Rn<Rt<Rf 2.5 “ “ “ Reflector Surface Between Antenna and 0.025 Complies with guidelines Ground Between Main Reflector and 8,771 Potential Hazard 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(4.5) 2 Rf= = = 578 meters λ 0.021 PG 400 x3.24 x10^5 S= = = 30.9W / m 2 4πR 2 4π (578) 2 S=3.09mW/cm2 B. Near Field D2 (4.5) 2 Rn= = = 240 meters 4λ (4) x(0.021) S= 16 nP2 = ( 16 )(. 6 )( 400 ) = 60 . 4 W / m 2 πD π ( 4 .5 ) 2 S=.604mW/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 400 x103 S= = = 2.5mW / cm2 πr 2 π (2.25 x10 ) 2 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= = 0.025mW / cm 2 100 F. Between Main Reflector and Feed: The diameter of the feed aperture is 7.62cm. The highest density will be at the aperture. P 400 x103 S= = = 8,771 mW / cm2 πr 2 π (3.81) 2


Document Created: 2004-12-22 17:10:21
Document Modified: 2004-12-22 17:10:21
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