Attachment RadHaz.pdf

This document pretains to SES-LIC-20180125-00062 for License on a Satellite Earth Station filing.

IBFS_SESLIC2018012500062_1330354

ANALYSIS OF NON-IONIZING RADIATION for ALASKA PUBLIC TELECOMMUNICATIONS INC Site: Anchorage State: AK Latitude: 61 11 24.8 Longitude: 149 48 33.7 (NAD83) 01-25-2018 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) = 4.5000 m Antenna Surface Area (Sa) = pi(D**2)/4 = 15.9043 m**2 Wavelength at 6.1750 GHz (lambda) = 0.0485 m Transmit Power at Flange (P) = 10.0000 Watts Antenna Gain at Earth Site (GES) = 46.7000 dBi = 46773.5141 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) = 250.5155 m --------- lambda Far Zone Power Density (Rf) = (GES)(P) = 0.5931 W/m**2 ------------ 4*pi*(Df**2) = 0.0593 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 = 104.3814 m -------- 4*lambda Near Zone Power Density (Rn) = 16.0(n)P = 1.5090 W/m**2 -------- pi(D**2) = 0.1509 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) = 1.2575 W/m**2 ---- Sa = 0.1258 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 = 0.6288 W/m**2 ---- Sa = 0.0629 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 4.9407 Complies with ANSI 2. Near Zone 4.8491 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface 4.8742 Complies with ANSI 5. Main Reflector to Ground 4.9371 Complies with ANSI -------------------------------------------------------------------------- Uncontrolled Safety Margin = 1.0 - Calculated Zone Value (mW/cm**2) -------------------------------------------------------------------------- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone 0.9407 Complies with ANSI 2. Near Zone 0.8491 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface 0.8742 Complies with ANSI 5. Main Reflector to Ground 0.9371 Complies with ANSI 6. EVALUATION ============== A. Controlled Environment B. Uncontrolled Environment All Zones comply with ANSI Standards.


Document Created: 2018-01-25 19:36:20
Document Modified: 2018-01-25 19:36:20
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