Attachment RAD HARZARD

This document pretains to SES-LIC-20000711-01144 for License on a Satellite Earth Station filing.

IBFS_SESLIC2000071101144_153282

JUL—11—00 1550 From:MINTZ LEVIN 2024347400 T—596 P.01/05 Job—878 Rent by: JetFax MOQ10e 5; 07/11/00 B:21AM;JetFax_#8§1;Page 2/6 Aacaiveq: 7111100 T 100AM j 703 470 2707 —> WILLIAMS MARKETING DEPY; Page 14 JLL 1i ‘@0@ BR8:@SAM COMSERRCH P.276 EXHIGEILT Page 1 OoF 5 This report analyzes the non—ionizing rediation lavelse for a 1.9 mater earth station system. The analysais and calculations performed in this report are in compliance with the methodg deacribed in the PCC Office of Engijnesering and Technology Bullerin, No. 65 first published in 1985 and revised in 1997 in Edition 97—01. The radiation safety limits used in the analysis are in conformance with the FCC R&O 96—326. Bulletin No. 65 and the PCC R4&O spsecifies that theroe are two acga:ace tiersa of expogauye limit@s that are degendanz on the situation in which the exposurse takes —.place @and/or the status of the individuals who are subject to tha exposure. The Maximum Feymissible Expogure (MPE) limits for persons in a General ~Fopulation/Uncontrclled environment are shown in Table 1. The Genersl ©Population/Unecontrolled MPE is a function of tranamit !requenc¥ and is for an exposure gerzod of thirty minutes or leses. The MPE limita for persons in an Oceupational/Controlled environment are shown in Table 2. The Occupational MPE is a funotion of tranamict frequency and is for an expopure period of six minutes or legs. The purfogc of the analysis described in _ this report is to determine the power fluyx density lavels of the earth —__@tation in the fayr—~field, near—field, transirion reqion, between the * gubreflector or feed and main reflector surface, at the main reflector ~ssurface, and betweer the antenna adge and the ground and to compare these levelse to the specified MPESs. Tabla 1. Limits for General Population/Uncontrolled EBxposuyre (MPE) Frequency Range (MKz2) Powser Densgity (mWatte/om**2) 30—300 t 0 .2 300—1500 Frequon=¥(MHZl‘(0.8/1200) is00—100, 600 .a Table 2. Limits for OGcecupational/Controlled Exposure (MPE) 30 —300 1 .0 300—15§500 Froduoncgtuflz)*(6.0/1200) 1500—100,000 .0 . _ Table 3 contaings the parameters that are used to calculate the varioun power i deneiries for the eayrth stations.

JUL—11—00 1550 From:MINTZ LEVIN 2024247400 T—696 P.02/05 Job—878 Rent hy: JetFax MQ1Qs &; 07/11/00 @:21AM; JeiFax_#851;Page /6 Reecarvea: ¥7};11,}00 71 G0AM; T700 476 2TAY —>» WILLIAMA MAAKETING QEPT ; Page 16 JUL 1i ‘@@A @B8:iBAM COMSEARCH P.3—6 EXHIBIT * Page 2 Of 5 . Table 3. Formulas and Parameters Uaed for Determining FPoweyr Flux Densitios Pazrameter Abbreviation Valua Unitae Antenna Biametaeary D 1 .9 metargk Antenna Surface Araa ga IL * D**2/4 metersg*®*2 Faed Flange Diameter Df 19 .0 cm Ahrea of Ffsesd Flange Fa ILI * DFf*+2/4 cm**2 Frequency Frequency 14250 MHz Wavelangth lambda 300/frequency (MH2) meters Tranomit Power P 350 .00 Watta Antanna Gain Gea 46 .6 d4a 1i Pi II 3 .1415927 n/a Antenna Efficiency n 0 .56 n/a © 1. PFar Field Distrance Calculatien *The distance to the beginning of the far field can be determinad from the ffollowing equation : (1) Distrance to the Far Field Region, (RFf) = 0.60 *« D#+*2 / lambda {1} = 102.9 meterp The maximum main beam power densaity in the Far Field can be detormined . from the following equarion: (2) On—Axis Powar Density in the Far Field, (Wf) — Ges * P / 4 * II « RPf**2 (1) = 117.531 Watts/metera*r*2 ' =— 112703mWatts/cm**2 ?2, Near Field Calculation Poawey flux density is considered to be at a maximum value thyoughout the entire length of the defined Near Fileld region. The region is contained _ _within a cylindrical volume having the aamsa diameter as the antenna. Past the boundary of the Near Pield yegion the power danaity from the antenna decreagesg linearly with respect to increasgsing disatance. The distance to the end of the Near Fiald can be deteyrmined "rom the following equation: (3) Extent of the Neay Field, (Rkn) — D*#*@2 / (4a * lambda) (3 ) = €2.9 matkeor®s : The maximum power density in the Near Field can be determined from the <~~ following equarieon: (4) ' Near Field Power Density, (Wn) 16.0 * n ® P / II * pr**2 {4. 274.370 Warte/meters*t*+2 27.437 mWatts/om**2

l JUL—11—00 15:§1 From:MINTZ LEVIN 2024347400 T—696 P.03/05 Job—878 v%unr by: JetFax MS1Ge 4; N7/11}00 8:214M;Jeifag #ARL1;jPage 476 Receiveads 7111700 r.8Gam; 7TaS «76 2TB7 +.> WILLIAMS MAAKETING PEPT; Page 16 JL i1 ‘8@ GB:10AM COMSFARCH P.4/6 EAHIBLT Page 3 of 56 3. ranpsicion Region CGale ons The Transition region is located between the Neay and Far Field yegionc. ‘As srated in Section 2. above the power denaity begins to decrease linearyly with increaging distance in the Transition region. While the poweyr density decreages inverael¥ with distance in the Transition region, the powar . density dscreases inversely with the square of the distance in the Pay — Field region. The maximum power density in the Transition regilon will nor excsed that ocoalculated for the Near Field yegion. The power denaricy calsulated in Section 1. above is the higheet power denaity the antenrna can produce in any of the reqgions away from the antenna. The power dengity at a distance Rt can be determined from the following equation: (5) Transition region Power Density,(Tt) = KWn * Rn / Rt (5) 4. Region between Faed Asgsmbly and Anptenna Reflectoy ~Transmisfilengs fxyom the feed assembly are divrected towayd the antenna reflector surface, and are confjned within a conical mhape defined pby the tYpe of feed aaaamb&g. The most common feed assemblies are waveguida .flanges, horns or subreflectors. The energy between the fesed asamambly and ~reflector suyface can be caloulmted bg decerminins the power denpity at —@"the feed assembly surface. This can be determined fyom the following ~equation: (6) Power Density at Feed Flange, (Wf) = 4 * P / Fi {(6) = 4937 .771 mWatte/om**2a 5. Main Reflector Region The power density in the main reflector is determined in the saame manner ag the power density at the feed asaembly, in 4. above, but the area is now the area of the reflecator aperture can be determinmned from the following equation: (7) Power Density at the Reflector Surf@ce, (Wa) 4 * P / SYa (7} it 41 it €4923.77"7 Watts/metarsa*®*2 $35,378mwWatta/em**2 6. Region between Reflector and Ground _Assuming uniform illumination of the reflector surface, the gowar denairy _‘ batween t?;)aucannn and ground can be deternmnined from the fellowing ‘~ equation: Powey Pengity betwesen Reflector and Ground, (Wqg) P / Sa CE 123 .444 Wattsa/metors*». mWates/cen**a

JUL—11—00 1§:§1 From:MINTZ LEVIN 2024347400 T—6396 P.047/05 Job—878 Bent by: Jetl ax MS1Oe §; 07711700 B:21AM; JetFax_#851;Page /6 Recelvad: 7}/11,00 ?2:00aM; rPas 47e eroer *~ WILLTAMS MARKETING OEPT; Page 17 Li 11 ‘B@ R@!iBA0M COMSEARCH P.S576 EXHIRLIT Page 4 of 5 Table 4. Aummary of Bxpectad Radiation levals for Uncontrolled Environment Region Calculatad Maximum Radistion Hazaxd Asaesament Powey Deng@ity Level (mWatts/em**2) 1. Far Fileld (RFf) =— 102.9 meters 11 . 753 Poteantial Hazayd 2. Near Field (FRn)}) = 42.9 mecaers 27 .437 Potentlal Hagard 3. Transition Region Rn < Rt < Rf, (RtC) 27 , 437 FPorential Hazard — 4. Betwseen Feed Agssembly §$2237 . 771 Porential Hazard and Antenna Reflector —5. Main Reflector a3.378 Potential Hazard 6. Between Reflector 12 .344 Potrential Hazard ‘ and Ground — Table 5. Summary of Expected Radiation levels foy Controlled Environment ':;Region Calculated Maximum Radiation Hazard Assessnent powey Density Level (mWattg/om**2) O1L. Far Field (RF) 102,3 meters 1i . 753 Potential Hazard 2. Near Field (Rn} 42.9 meters 27 .437 Potential Hazard 3. Transition Region Rn < Rr < Rf, [(Rt) 27 .437 Potential Hazayd 4. Between Faad Assembly €937.7711 Potential Hazard > and Antenna Reflectoy 5. Msin Re€lector Potential Kazayd ._6. Between Reflector Potential Hazard and Ground . It is the applicant‘s vresponsibility to ensura that the public and .. operational personnel are not exposed to harmful levels of radiacion.

JUL—11—00 1§5:51 From:MINTZ LEVIN 2024347400 T—696 P.05/05 Job—878 Sent by: JetFax MY10e 4; 07/11700 H:22AM; JefFpxz_#851;Page 6/f | Receiwad: 7711700 ?110AM; T098 4T6 27TA7T —> WILLTAMS MARAKETIEING DEPT; Page 18 L 11 ‘@@ Q@@:LiAM1 COMSEARCH P.5/6 TXMIRIT A Page 5 of 5 7. Conclusions Rased on the above analysia it i@a concluded that the FCC MPE quidelines have been exceeded {or met) in the ragiona of Table 4¢. The applicant proposes to comply with the FCC MPE limits by one or more af the following methods. The antenna will be roof mountsed st a minimim slevation of 2.4 meters above ground level and since ons dismeter removed from the center of main bean the levels are down at least 20 dB, or by a factor of 100, public safety will be angured for the near and far field yegions. The antenna trensmitter will be turned off during maintenance in order to comply with the FRC MPR limit of S mW/cm2 at the Reflector Surface.


Document Created: 2000-07-11 16:31:00
Document Modified: 2000-07-11 16:31:00
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