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HomeMy WebLinkAboutDOC010.prn 4 BE Exposure lysis for Proposed New 1 r Wireless PCS LLC Antenna Facility Site IID- LI-1025 Jan 10,2010 Prepared by Azad Karim RF o Engineer `l I Bechtel Communications,Ine. New Cingular Wireless PCS,LLC 1, Introduction This report constitutes an 1U* exposure analysis for the proposed Corgular Wireless antenna facility to be located at , 1040-B Homes Up Southhold New York, This analysis uses site-specific engineering data to determine the predicted levels of radio frequency(RI')electromagnetic energy in the vicinity of the proposed facility and compares those levels with the Maximum Permissible Exposure (MFE) limits established by the Federal Communications Commission. 2, Site Data AT&T Site Name: Southold Villagee Number of simultaneously operating channels GSM850: GSMIPO(k LJM`pSl900: 1-1-1 UNTE5850: 1-1-1 T e of ant DBXLH-8585A-R2M Power per channel(Watts ERP) GSM850:500 Watts GSM1900:800 Wafts 51900:800 Watts UM`r5850:500 Watts Antenna Center Line(feet AGQ 73 feet Ant4,24 feet 3 New Cingular Wireless PCN,LLC 3, RF Exposure Prediction The following equations established by the FCC,in conjunction with the site data,were used to determine the levels of RF electromagnetic energy present in the vicinity of the proposed facility': 0.64*N*EIR)"(9) PowerDensity= 9*R 2 parsaxistil Eq.I-Farzodd Where,N=Number of channels,JW distance in can from the ED (Radiation Center) of antenna, and ELRFOS -The isotropic power expressed in saillinsints in the direction of prediction point. PowerDearrity=— P,, Ich*2V*10' _(reareari Eq.2-Nearweedd 2*cr"R*h"a/360 Where Rah=Input power to supreme terminals in watts/ch,R=distance to center of radiation, h=aperture height in meters, a —3 dB band-width of horizontal process. 4. FCC Guidelines for Evaluating the Environmental Effects of RF Radiation In 1985,the FCC established rules to regulate radio frequency CRF)expoccus from FCC licensed antenna facilities. In 1996,the FCC updated these rates,which were further amended in August 1997 by a Second Memorandum Opinion and Order. These new rules represent a consensus of the federal agencies responsible for the protection of public health and the environment, including the Environmental Protection Agency (EPA), the Food and Drug Administration (FDA), the National Institute for Occupational Health and Safety (NIOSH), and the Occupational Safety and Health Administration(OSHA), Under the laws that govern the delivery of wireless communications services in the United States,as amended by the Telecommunications Act of 1996, the FCC has excessive jurisdiction over BY emissions from personal wireless anorma facilities,which include cellular,PCs,messaging and aviation ince,2 Function to its authority under federal law,the FCC has established suber to regulate the safety of emissions from these facilities. 5. Comparison with Standards Exhibit A shows the levels of RF electromagnetic energy for the Cellular system as one moves away from the antenna 2 facility. As shown in Exhibit A,the total maximum power density is 1.73#11hrm. which sea=at approximately 450 feet from the antenna facility. 'IT exposure is measured and predicted ir terms of power density in units of roddiwairs(raw),a thousandth of a watt,or imorawaus(j114%a millionth of a watt,per square can (cm?). Data comparing;predictive analysis with on site measurements too demonstrated that power density art be effectively predicted at given locations is the vicinity of a wireless antenna facility. 2 47 U.S.C.Section 332(c)(71)(13)(iv)states that"pilo State or local government or tastrumentaluTy thereof may regulate the placement,construction,and modification of personal wireless service facilities on the basis of the environmental effects of radio frequency emnscom to Lie extent that such finehfica comply with the Commission's regulations cousemimissuch emissions" 4 New C sus ar Wirehas PCS LLC Exhibit B shows the levels of BY electromagnetic anergy for the PCS system as one moves away from theantenna facility. shown in `bit B,the total power density is 2,25fir Wools which occurs at approximately 100 feet from the antenna facility. Exhibit C shows the cumulative levels of RE electromagnetic energy for the site as one moves away from the antenna facility. As shown in Exhibit C,the total maximum power density is OIJE tG8 1 .. which occurs at approximately loo feet from the antenna facility. Table t below shows the Maximum Permissible Exposure E)limits established by the FCC. There are different MPElftmts for publictuncontrolled and occupstia controlled rarvirivarecters, Table Z:Announce Permissible Exposure E) lisboyfier Air mention tion FreRex Publ` ncox Ited des Place; cc aalted Cellular 579 )t Wount 2,897 pW1 z PCs 1000 y Wanst, 5,000 WIGIns The maxim= cumulative power density at the proposed facility represents only 0.29% of the publiclusessetrolled E limit which is 357.47 times lower than E limit for uncontrolled environment 6. Conclusion This clysis shows that the maximum power density in accessible areas at this location is well below the Maximum Permissible Exprourre limit established by the FCC. 5 New Cingular Wireless PCs,LLC 7. ECC Limits for Maximum Permissible Exposure FCC Urnfor MaArraint, i Plano-wave ont Powsorponsor 1,000 too 9 �4 rE g, gp} &ra W ¢ CL 0 `- _ _ _ _• MI , 0.03 0.3 3 3D 300 3,00030,000 jowwo, 1.34 l000 1 Frequency (MH# 6 New Cin lar Wireless PCS,LLC . Exhibit A-Cellular System Plot showing the variation of the power density of the antenna system as a percentage of the FCC limits for the facility (shown on the X-axis) versus the horrizontal distance along the. ground (shown on the X-axis) direotly in front of the antenna sector. "Elio tt main value is 0.30% ftla PC . for �'1P flay, uncontsoll d c " o o t; Whipli cac ra at " distance of"a tpl ... . 45b feet in m dtho an , �a As illustrated by the chart below, the total power density for 850 MHz signal is almost negligible. 100% of patrolled Irmit trolled P Result -100% of Uncontrolled MPE ®5% of Uncontrolled MPE ? 20 cm (0.656 a} -Predicted Power Density Uj 10000 CL 1000 - 1 100 € ... b 10l ': . v 1 4-._- I LOA 0.01 0.1 1 10 100 1000 10000 Horizontal Distance From Antenna,ft ._...... .........