Attachment Rad Hazard 10m

This document pretains to SES-MOD-20100722-00944 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2010072200944_830679

ANALYSIS OF NON-IONIZING RADIATION for CBS BROADCASTING INC Site: TV City State: CA Latitude: 34 4 31.0 Longitude: 118 21 38.3 (NAD83) 07-09-2010 The Office of Science and Technology Bulletin, No. 65, October 1985 and revised August 1997, 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) for a controlled environment. For an uncontrolled environment, the maximum level of non-ionizing radiation that a person may be exposed to over a thirty minute period is an average power density equal to 1 mW/cm**2 (one milliwatt 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) = 10.0000 m Antenna Surface Area (Sa) = pi(D**2)/4 = 78.5398 m**2 Wavelength at 6.1750 GHz (lambda) = 0.0485 m Transmit Power at Flange (P) = 270.0000 Watts Antenna Gain at Earth Site (GES) = 54.6000 dBi = 288403.1503 Power Ratio: AntiLog(GES/10) pi = 3.1415927 Antenna Aperture Efficiency (n) = 0.6000

1. FAR ZONE CALCULATIONS ======================== Distance to the Far Zone (Df) = (n)(D**2) = 1237.1134 m --------- lambda Far Zone Power Density (Rf) = (GES)(P) = 4.0489 W/m**2 ------------ 4*pi*(Df**2) = 0.4049 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 = 515.4639 m -------- 4*lambda Near Zone Power Density (Rn) = 16.0(n)P = 8.2506 W/m**2 -------- pi(D**2) = 0.8251 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. MAIN REFLECTOR ZONE ====================== Main Reflector Power Density = 2(P) = 6.8755 W/m**2 ---- Sa = 0.6875 mW/cm**2 5. ZONE BETWEEN THE MAIN REFLECTOR AND THE GROUND ================================================= Applying uniform illumination of the Main Reflector Surface: Main to Ground Power Density = P = 3.4377 W/m**2 ---- Sa = 0.3438 mW/cm**2

CALCULATED SAFETY MARGINS SUMMARY AND EVALUATION -------------------------------------------------------------------------- Controlled Safety Margin = 5.0 - Calculated Zone Value (mW/cm**2) -------------------------------------------------------------------------- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone 4.5951 Complies with ANSI 2. Near Zone 4.1749 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface 4.3125 Complies with ANSI 5. Main Reflector to Ground 4.6562 Complies with ANSI -------------------------------------------------------------------------- Uncontrolled Safety Margin = 1.0 - Calculated Zone Value (mW/cm**2) -------------------------------------------------------------------------- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone 0.5951 Complies with ANSI 2. Near Zone 0.1749 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface 0.3125 Complies with ANSI 5. Main Reflector to Ground 0.6562 Complies with ANSI 6. EVALUATION ============== A. Controlled Environment B. Uncontrolled Environment All Zones comply with ANSI Standards.


Document Created: 2019-04-20 20:34:52
Document Modified: 2019-04-20 20:34:52
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