Attachment RadSafe Report Stehe

This document pretains to SES-LIC-20051006-01377 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005100601377_458302

ANALYSIS OF NON-IONIZING RADIATION for WESTGATE COMMUNICATIONS LLC Site: STEHEKIN 2 State: WA Latitude: 48 19 34.0 Longitude: 120 41 4.0 (NAD83) 09-02-2005 The Office of Science and Technology Bulletin, No. 65, October 1985, specifies that the maximum level of non-ionizing radiation that a person may be exposed to over a six minute period is an average power density equal to 5 mW/cm**2 (five milliwatts per centimeter squared). It is the purpose of this report to determine the maximum power flux densities of the earth station in the far zone, near zone, transition zone, at the main reflector surface, and between the antenna edge and the ground. Parameters which were used in the calculations: =============================================== Antenna Diameter, (D) = 4.8000 m Antenna Surface Area (Sa) = pi(D**2)/4 = 18.0956 m**2 Sub Reflector Diameter (Ds) = 35.5600 cm Area of the Sub Reflector (As) = pi(Ds**2)/4 = 0.0993 m**2 Wavelength at 6.1750 GHz (lambda) = 0.0485 m Transmit Power at Flange (P) = 25.5000 Watts Antenna Gain at Earth Site (GES) = 48.1000 dBi = 64565.4229 Power Ratio: AntiLog (GES/10) pi = 3.1415927 Antenna Aperture Efficiency (n) = 0.6500

1. FAR ZONE CALCULATIONS ======================== Distance to the Far Zone (Df) = (n)(D**2) = 308.7835 m --------- lambda Far Zone Power Density (Rf) = (GES)(P) = 1.3741 W/m**2 ------------ 4*pi*(Df**2) = 0.1374 mW/cm**2 2. NEAR ZONE CALCULATIONS ========================= Power Flux Density is considered to be at a maximum value throughout the entire length of this Zone. The Zone is contained within a cylindrical volume which has the same diameter as the antenna. Beyond the Near Zone, the Power Flux Density will decrease with distance from the Antenna. Distance to the Near Zone (Dn) = D**2 = 118.7629 m -------- 4*lambda Near Zone Power Density (Rn) = 16.0(n)P = 3.6639 W/m**2 -------- pi(D**2) = 0.3664 mW/cm**2 3. TRANSITION ZONE CALCULATIONS =============================== The Power Density begins to decrease with distance in the Transition Zone. While the Power Density decreases inversely with distance in the Transition Zone, the Power Density decreases inversely with the square of the distance in the Far Zone. Since the maximum Power Density in the Transition Zone will not exceed the Near Zone values, it is not calculated.

4. ZONE BETWEEN THE SUB AND MAIN REFLECTORS =========================================== Transmissions from the feed horn are directed toward the Sub Reflector surface and are reflected back toward the Main Reflector. The energy between the Sub Reflector and Main Reflector surfaces can be calculated by determining the Power Density at the Sub Reflector surface as follows: Sub Reflector Power Density = 2(P) = 513.5193 W/m**2 ---- As = 51.3519 mW/cm**2 5. MAIN REFLECTOR ZONE ====================== Main Reflector Power Density = 2(P) = 2.8184 W/m**2 ---- Sa = 0.2818 mW/cm**2 6. ZONE BETWEEN THE MAIN REFLECTOR AND THE GROUND ================================================= Applying uniform illumination of the Main Reflector Surface: Main to Ground Power Density = P = 1.4092 W/m**2 ---- Sa = 0.1409 mW/cm**2

CALCULATED SAFETY MARGINS SUMMARY AND EVALUATION ------------------------------------------------------------------------ -- Safety Margin = 5.0 - Calculated Zone Value (mW/cm**2) ------------------------------------------------------------------------ -- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone 4.8626 Complies with ANSI 2. Near Zone 4.6336 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Sub to Main Reflector -46.3519 POTENTIALLY HAZARDOUS 5. Main Reflector Surface 4.7182 Complies with ANSI 6. Main Reflector to Ground 4.8591 Complies with ANSI 7. EVALUATION ============== The SUB to MAIN Reflector ZONE does not comply with the ANSI standards! WARNING SIGNS will be posted for the affected Zone indicating danger while the system is in use. Additionally, the system will be shut down for servicing.


Document Created: 2019-04-14 04:58:23
Document Modified: 2019-04-14 04:58:23
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