Attachment RADSAFE.pdf

This document pretains to SES-LIC-20050916-01265 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005091601265_450251

ANALYSIS OF NON-IONIZING RADIATION for NEVADA STATE OF Site: CARSON FACILITY State: NV Latitude: 39 9 43.2 Longitude: 119 45 44.7 (NAD83) 08-18-2005 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) = 3.8000 m Antenna Surface Area (Sa) = pi(D**2)/4 = 11.3411 m**2 Sub Reflector Diameter (Ds) = 50.8000 cm Area of the Sub Reflector (As) = pi(Ds**2)/4 = 0.2027 m**2 Wavelength at 14.2500 GHz (lambda) = 0.0210 m Transmit Power at Flange (P) = 25.0000 Watts Antenna Gain at Earth Site (GES) = 53.4000 dBi = 218776.1624 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) = 446.9524 m --------- lambda Far Zone Power Density (Rf) = (GES)(P) = 2.1788 W/m**2 ------------ 4*pi*(Df**2) = 0.2179 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 = 171.9048 m -------- 4*lambda Near Zone Power Density (Rn) = 16.0(n)P = 5.7313 W/m**2 -------- pi(D**2) = 0.5731 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) = 246.6907 W/m**2 ---- As = 24.6691 mW/cm**2 5. MAIN REFLECTOR ZONE ====================== Main Reflector Power Density = 2(P) = 4.4087 W/m**2 ---- Sa = 0.4409 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 = 2.2044 W/m**2 ---- Sa = 0.2204 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 4.7821 Complies with ANSI 2. Near Zone 4.4269 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Sub to Main Reflector -19.6691 POTENTIALLY HAZARDOUS 5. Main Reflector Surface 4.5591 Complies with ANSI 6. Main Reflector to Ground 4.7796 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: 2019-04-22 17:22:31
Document Modified: 2019-04-22 17:22:31
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