Attachment Exhibit 6

This document pretains to SES-MOD-20130405-00310 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2013040500310_992357

Exhibit 6 Exhibit 6 Exhibit 6 ANALYSIS OF NON-IONIZING RADIATION for GCI COMMUNICATIONS CORPORATION Site: Unalakleet ES State: AK Latitude: 63 52 37.2 Longitude: 160 47 20.2 (NAD83) 03-22-2013 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) = 3.8000 m Antenna Surface Area (Sa) = pi(D**2)/4 = 11.3411 m**2 Wavelength at 6.2000 GHz (lambda) = 0.0483 m Transmit Power at Flange (P) = 201.5000 Watts Antenna Gain at Earth Site (GES) = 46.2000 dBi = 41686.9383 Power Ratio: AntiLog (GES/10) pi = 3.1415927 Antenna Aperture Efficiency (n) = 0.6000 Exhibit 6 Exhibit 6 1 of 5

Exhibit 6 Exhibit 6 Exhibit 6 1. FAR ZONE CALCULATIONS ======================== Distance to the Far Zone (Df) = (n)(D**2) = 179.3789 m --------- lambda Far Zone Power Density (Rf) = (GES)(P) = 20.7741 W/m**2 ------------ 4*pi*(Df**2) = 2.0774 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 = 74.7412 m -------- 4*lambda Near Zone Power Density (Rn) = 16.0(n)P = 42.6412 W/m**2 -------- pi(D**2) = 4.2641 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. Exhibit 6 Exhibit 6 2 of 5

Exhibit 6 Exhibit 6 Exhibit 6 4. MAIN REFLECTOR ZONE ====================== Main Reflector Power Density = 2(P) = 35.5343 W/m**2 ---- Sa = 3.5534 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 = 17.7672 W/m**2 ---- Sa = 1.7767 mW/cm**2 Exhibit 6 Exhibit 6 3 of 5

Exhibit 6 Exhibit 6 Exhibit 6 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 2.9226 Complies with ANSI 2. Near Zone 0.7359 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface 1.4466 Complies with ANSI 5. Main Reflector to Ground 3.2233 Complies with ANSI ------------------------------------------------------------------------ -- Uncontrolled Safety Margin = 1.0 - Calculated Zone Value (mW/cm**2) ------------------------------------------------------------------------ -- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone -1.0774 POTENTIALLY HAZARDOUS 2. Near Zone -3.2641 POTENTIALLY HAZARDOUS 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface -2.5534 POTENTIALLY HAZARDOUS 5. Main Reflector to Ground -0.7767 POTENTIALLY HAZARDOUS 6. EVALUATION ============== A. Controlled Environment B. Uncontrolled Environment Exhibit 6 Exhibit 6 4 of 5

Exhibit 6 Exhibit 6 Exhibit 6 The FAR 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. The NEAR 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. The MAIN Reflector Surface 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. The MAIN Reflector to GROUND 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. Exhibit 6 Exhibit 6 5 of 5


Document Created: 2013-03-29 10:38:17
Document Modified: 2013-03-29 10:38:17
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