Attachment Exhibit A

This document pretains to SES-MOD-20171206-01309 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017120601309_1311709

RigNet Satcom, Inc. EXHIBIT A Radiation Hazard Study Prodelin 1123 This study analyzes the potential Radio Frequency (RF) human exposure levels caused by the Electro Magnetic (EM) fields of the above-captioned antenna. The mathematical analysis performed below complies with the methods described in the Federal Communications Commission Office of Engineering and Technology Bulletin No. 65 (1985 rev. 1997) R&O 96-326. Maximum Permisible Exposure There are two separate levels of exposure limits. The first applies to persons in the general population who are in an uncontrolled environment. The second applies to trained personnel in a controlled environment. According to 47 C.F.R. § 1.1310, the Maximum Permissible Exposure (MPE) limits for frequencies above 1.5 GHz are as follows: • General Population / Uncontrolled Exposure 1.0 mW/cm2 • Occupational / Controlled Exposure 5.0 mW/cm2 The purpose of this study is to determine the power flux density levels for the earth station under study as compared with the MPE limits. This comparison is done in each of the following regions: 1. Far-field region 2. Near-field region 3. Transition region 4. The region between the feed and the antenna surface 5. The main reflector region 6. The region between the antenna edge and the ground Input Parameters The following input parameters were used in the calculations: Parameter Value Unit Symbol Atenna Diameter: 1.2 m D Antenna Transmit Gain: 43.20 dBi G Trasmit Frequency: 14250 MHz f Feed Flange Diameter: 13.30 cm d Power Input to the Antenna: 21.60 W P Calculated Parameters The following values were calculated using the above input parameters and the corresponding formulas. Parameter Value Unit Symbol Formula 2 2 Anenna Surface Area: 1.13 m A πD /4 2 2 Area of Feed Flange: 138.93 cm a πd /4 2 2 2 Antenna Efficiency: 0.65 η Gλ /( π D ) G /10 Gain Factor: 20892.96 g 10 Wavelength: 0.0211 m λ 300/ f 1 of 3

RigNet Satcom, Inc. EXHIBIT A Behavior of EM Fields as a Function of Distance The behavior of the characteristics of EM fields varies depending on the distance from the radiating antenna. These characteristics are analyzed in three primary regions: the near-field region, the far-field region and the transition region. Of interest also are the region between the antenna main reflector and the subreflector, the region of the main reflector area and the region between the main reflector and ground. Figure 1. EM Fields as a Function of Distance For parabolic aperture antennas with circular cross sections, such as the antenna under study, the near-field, far- field and transition region distances are calculated as follows: Parameter Value Unit Formula 2 Near Field Distance: 17.100 m Rnf = D /(4λ) Distance to Far Field: 41.040 m Rff = 0.60D2/(λ) Distance of Trasition Region 17.100 m Rt = Rnf The distance in the transition region is between the near and far fields. Thus, Rnf ≤ Rt ≤ Rff . However, the power density in the transition region will not exceed the power density in the near-field. Therefore, for purposes of the present analysis, the distance of the transition region can equate the distance to the near-field. Power Flux Density Calculations The power flux density is considered to be at a maximum through the entire length of the near-field. This region is contained within a cylindrical volume with a diameter, D, equal to the diameter of the antenna. In the transition region and the far-field, the power density decreases inversely with the square of the distance. The following equations are used to calculate power density in these regions. 2 of 3

RigNet Satcom, Inc. EXHIBIT A Parameter Value Unit Symbol Formula 2 Power Density in the Near-Field 4.978 mW/cm S nf 16.0 η P /(πD 2) 2 Power Density in the Far-Field 2.132 mW/cm S ff GP /(4π R ff2) 2 Power Density in the Trans. Region 4.978 mW/cm St Snf R nf /(R t) The region between the main reflector and the subreflector is confined within a conical shape defined by the feed assembly. The most common feed assemblies are waveguide flanges. This energy is determined as follows: Parameter Value Unit Symbol Formula 2 Power Density at the Feed Flange 621.9 mW/cm S fa 4P / a The power density in the main reflector is determined similarly to the power density at the feed flange; except that the area of the reflector is used. Parameter Value Unit Symbol Formula 2 Power Density at Main Reflector 7.639 mW/cm S surface 4P / A The power density between the reflector and ground, assuming uniform illumination of the reflector surface, is calculated as follows: Parameter Value Unit Symbol Formula Power Density between Reflector and Ground 1.910 mW/cm2 Sg P /A Table 1 summarizes the calculated power flux density values for each region. In a controlled environment, the only regions that exceed FCC limitations are shown below. These regions are only accessible by trained technicians who, as a matter of procedure, turn off transmit power before performing any work in these areas. Controlled Environment Power Densities mW/cm2 (5 mW/cm2) Far Field Calculation 2.132 Satisfies FCC Requirements Near Field Calculation 4.978 Satisfies FCC Requirements Transition Region 4.978 Satisfies FCC Requirements Region between Main and Subreflector 621.9 Exceeds Limitations Main Reflector Region 7.639 Exceeds Limitations Region between Main Reflector and Ground 1.910 Satisfies FCC Requirements Table 1. Power Flux Density for Each Region In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in 47 C.F.R. § 1.1310. 3 of 3

RigNet Satcom, Inc. EXHIBIT A Radiation Hazard Study Prodelin 1132 This study analyzes the potential Radio Frequency (RF) human exposure levels caused by the Electro Magnetic (EM) fields of the above-captioned antenna. The mathematical analysis performed below complies with the methods described in the Federal Communications Commission Office of Engineering and Technology Bulletin No. 65 (1985 rev. 1997) R&O 96-326. Maximum Permisible Exposure There are two separate levels of exposure limits. The first applies to persons in the general population who are in an uncontrolled environment. The second applies to trained personnel in a controlled environment. According to 47 C.F.R. § 1.1310, the Maximum Permissible Exposure (MPE) limits for frequencies above 1.5 GHz are as follows: • General Population / Uncontrolled Exposure 1.0 mW/cm2 • Occupational / Controlled Exposure 5.0 mW/cm2 The purpose of this study is to determine the power flux density levels for the earth station under study as compared with the MPE limits. This comparison is done in each of the following regions: 1. Far-field region 2. Near-field region 3. Transition region 4. The region between the feed and the antenna surface 5. The main reflector region 6. The region between the antenna edge and the ground Input Parameters The following input parameters were used in the calculations: Parameter Value Unit Symbol Atenna Diameter: 1.2 m D Antenna Transmit Gain: 43.30 dBi G Trasmit Frequency: 14125 MHz f Feed Flange Diameter: 14.60 cm d Power Input to the Antenna: 20.80 W P Calculated Parameters The following values were calculated using the above input parameters and the corresponding formulas. Parameter Value Unit Symbol Formula 2 2 Anenna Surface Area: 1.13 m A πD /4 2 2 Area of Feed Flange: 167.42 cm a πd /4 2 2 2 Antenna Efficiency: 0.68 η Gλ /( π D ) G /10 Gain Factor: 21379.62 g 10 Wavelength: 0.0212 m λ 300/ f 1 of 3

RigNet Satcom, Inc. EXHIBIT A Behavior of EM Fields as a Function of Distance The behavior of the characteristics of EM fields varies depending on the distance from the radiating antenna. These characteristics are analyzed in three primary regions: the near-field region, the far-field region and the transition region. Of interest also are the region between the antenna main reflector and the subreflector, the region of the main reflector area and the region between the main reflector and ground. Figure 1. EM Fields as a Function of Distance For parabolic aperture antennas with circular cross sections, such as the antenna under study, the near-field, far- field and transition region distances are calculated as follows: Parameter Value Unit Formula 2 Near Field Distance: 16.950 m Rnf = D /(4λ) Distance to Far Field: 40.680 m Rff = 0.60D2/(λ) Distance of Trasition Region 16.950 m Rt = Rnf The distance in the transition region is between the near and far fields. Thus, Rnf ≤ Rt ≤ Rff . However, the power density in the transition region will not exceed the power density in the near-field. Therefore, for purposes of the present analysis, the distance of the transition region can equate the distance to the near-field. Power Flux Density Calculations The power flux density is considered to be at a maximum through the entire length of the near-field. This region is contained within a cylindrical volume with a diameter, D, equal to the diameter of the antenna. In the transition region and the far-field, the power density decreases inversely with the square of the distance. The following equations are used to calculate power density in these regions. 2 of 3

RigNet Satcom, Inc. EXHIBIT A Parameter Value Unit Symbol Formula 2 Power Density in the Near-Field 4.992 mW/cm S nf 16.0 η P /(πD 2) 2 Power Density in the Far-Field 2.138 mW/cm S ff GP /(4π R ff2) 2 Power Density in the Trans. Region 4.992 mW/cm St Snf R nf /(R t) The region between the main reflector and the subreflector is confined within a conical shape defined by the feed assembly. The most common feed assemblies are waveguide flanges. This energy is determined as follows: Parameter Value Unit Symbol Formula 2 Power Density at the Feed Flange 497.0 mW/cm S fa 4P / a The power density in the main reflector is determined similarly to the power density at the feed flange; except that the area of the reflector is used. Parameter Value Unit Symbol Formula 2 Power Density at Main Reflector 7.356 mW/cm S surface 4P / A The power density between the reflector and ground, assuming uniform illumination of the reflector surface, is calculated as follows: Parameter Value Unit Symbol Formula Power Density between Reflector and Ground 1.839 mW/cm2 Sg P /A Table 1 summarizes the calculated power flux density values for each region. In a controlled environment, the only regions that exceed FCC limitations are shown below. These regions are only accessible by trained technicians who, as a matter of procedure, turn off transmit power before performing any work in these areas. Controlled Environment Power Densities mW/cm2 (5 mW/cm2) Far Field Calculation 2.138 Satisfies FCC Requirements Near Field Calculation 4.992 Satisfies FCC Requirements Transition Region 4.992 Satisfies FCC Requirements Region between Main and Subreflector 497.0 Exceeds Limitations Main Reflector Region 7.356 Exceeds Limitations Region between Main Reflector and Ground 1.839 Satisfies FCC Requirements Table 1. Power Flux Density for Each Region In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in 47 C.F.R. § 1.1310. 3 of 3

RigNet Satcom, Inc. EXHIBIT A Radiation Hazard Study Prodelin 1134 This study analyzes the potential Radio Frequency (RF) human exposure levels caused by the Electro Magnetic (EM) fields of the above-captioned antenna. The mathematical analysis performed below complies with the methods described in the Federal Communications Commission Office of Engineering and Technology Bulletin No. 65 (1985 rev. 1997) R&O 96-326. Maximum Permisible Exposure There are two separate levels of exposure limits. The first applies to persons in the general population who are in an uncontrolled environment. The second applies to trained personnel in a controlled environment. According to 47 C.F.R. § 1.1310, the Maximum Permissible Exposure (MPE) limits for frequencies above 1.5 GHz are as follows: • General Population / Uncontrolled Exposure 1.0 mW/cm2 • Occupational / Controlled Exposure 5.0 mW/cm2 The purpose of this study is to determine the power flux density levels for the earth station under study as compared with the MPE limits. This comparison is done in each of the following regions: 1. Far-field region 2. Near-field region 3. Transition region 4. The region between the feed and the antenna surface 5. The main reflector region 6. The region between the antenna edge and the ground Input Parameters The following input parameters were used in the calculations: Parameter Value Unit Symbol Atenna Diameter: 1.2 m D Antenna Transmit Gain: 43.00 dBi G Trasmit Frequency: 14250 MHz f Feed Flange Diameter: 14.60 cm d Power Input to the Antenna: 22.70 W P Calculated Parameters The following values were calculated using the above input parameters and the corresponding formulas. Parameter Value Unit Symbol Formula 2 2 Anenna Surface Area: 1.13 m A πD /4 2 2 Area of Feed Flange: 167.42 cm a πd /4 2 2 2 Antenna Efficiency: 0.62 η Gλ /( π D ) G /10 Gain Factor: 19952.62 g 10 Wavelength: 0.0211 m λ 300/ f 1 of 3

RigNet Satcom, Inc. EXHIBIT A Behavior of EM Fields as a Function of Distance The behavior of the characteristics of EM fields varies depending on the distance from the radiating antenna. These characteristics are analyzed in three primary regions: the near-field region, the far-field region and the transition region. Of interest also are the region between the antenna main reflector and the subreflector, the region of the main reflector area and the region between the main reflector and ground. Figure 1. EM Fields as a Function of Distance For parabolic aperture antennas with circular cross sections, such as the antenna under study, the near-field, far- field and transition region distances are calculated as follows: Parameter Value Unit Formula 2 Near Field Distance: 17.100 m Rnf = D /(4λ) Distance to Far Field: 41.040 m Rff = 0.60D2/(λ) Distance of Trasition Region 17.100 m Rt = Rnf The distance in the transition region is between the near and far fields. Thus, Rnf ≤ Rt ≤ Rff . However, the power density in the transition region will not exceed the power density in the near-field. Therefore, for purposes of the present analysis, the distance of the transition region can equate the distance to the near-field. Power Flux Density Calculations The power flux density is considered to be at a maximum through the entire length of the near-field. This region is contained within a cylindrical volume with a diameter, D, equal to the diameter of the antenna. In the transition region and the far-field, the power density decreases inversely with the square of the distance. The following equations are used to calculate power density in these regions. 2 of 3

RigNet Satcom, Inc. EXHIBIT A Parameter Value Unit Symbol Formula 2 Power Density in the Near-Field 4.996 mW/cm S nf 16.0 η P /(πD 2) 2 Power Density in the Far-Field 2.140 mW/cm S ff GP /(4π R ff2) 2 Power Density in the Trans. Region 4.996 mW/cm St Snf R nf /(R t) The region between the main reflector and the subreflector is confined within a conical shape defined by the feed assembly. The most common feed assemblies are waveguide flanges. This energy is determined as follows: Parameter Value Unit Symbol Formula 2 Power Density at the Feed Flange 542.4 mW/cm S fa 4P / a The power density in the main reflector is determined similarly to the power density at the feed flange; except that the area of the reflector is used. Parameter Value Unit Symbol Formula 2 Power Density at Main Reflector 8.028 mW/cm S surface 4P / A The power density between the reflector and ground, assuming uniform illumination of the reflector surface, is calculated as follows: Parameter Value Unit Symbol Formula Power Density between Reflector and Ground 2.007 mW/cm2 Sg P /A Table 1 summarizes the calculated power flux density values for each region. In a controlled environment, the only regions that exceed FCC limitations are shown below. These regions are only accessible by trained technicians who, as a matter of procedure, turn off transmit power before performing any work in these areas. Controlled Environment Power Densities mW/cm2 (5 mW/cm2) Far Field Calculation 2.140 Satisfies FCC Requirements Near Field Calculation 4.996 Satisfies FCC Requirements Transition Region 4.996 Satisfies FCC Requirements Region between Main and Subreflector 542.4 Exceeds Limitations Main Reflector Region 8.028 Exceeds Limitations Region between Main Reflector and Ground 2.007 Satisfies FCC Requirements Table 1. Power Flux Density for Each Region In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in 47 C.F.R. § 1.1310. 3 of 3

RigNet Satcom, Inc. EXHIBIT A Radiation Hazard Study Prodelin 1251 This study analyzes the potential Radio Frequency (RF) human exposure levels caused by the Electro Magnetic (EM) fields of the above-captioned antenna. The mathematical analysis performed below complies with the methods described in the Federal Communications Commission Office of Engineering and Technology Bulletin No. 65 (1985 rev. 1997) R&O 96-326. Maximum Permisible Exposure There are two separate levels of exposure limits. The first applies to persons in the general population who are in an uncontrolled environment. The second applies to trained personnel in a controlled environment. According to 47 C.F.R. § 1.1310, the Maximum Permissible Exposure (MPE) limits for frequencies above 1.5 GHz are as follows: • General Population / Uncontrolled Exposure 1.0 mW/cm2 • Occupational / Controlled Exposure 5.0 mW/cm2 The purpose of this study is to determine the power flux density levels for the earth station under study as compared with the MPE limits. This comparison is done in each of the following regions: 1. Far-field region 2. Near-field region 3. Transition region 4. The region between the feed and the antenna surface 5. The main reflector region 6. The region between the antenna edge and the ground Input Parameters The following input parameters were used in the calculations: Parameter Value Unit Symbol Atenna Diameter: 2.4 m D Antenna Transmit Gain: 49.20 dBi G Trasmit Frequency: 14125 MHz f Feed Flange Diameter: 14.60 cm d Power Input to the Antenna: 56.00 W P Calculated Parameters The following values were calculated using the above input parameters and the corresponding formulas. Parameter Value Unit Symbol Formula 2 2 Anenna Surface Area: 4.52 m A πD /4 2 2 Area of Feed Flange: 167.42 cm a πd /4 2 2 2 Antenna Efficiency: 0.66 η Gλ /( π D ) G /10 Gain Factor: 83176.38 g 10 Wavelength: 0.0212 m λ 300/ f 1 of 3

RigNet Satcom, Inc. EXHIBIT A Behavior of EM Fields as a Function of Distance The behavior of the characteristics of EM fields varies depending on the distance from the radiating antenna. These characteristics are analyzed in three primary regions: the near-field region, the far-field region and the transition region. Of interest also are the region between the antenna main reflector and the subreflector, the region of the main reflector area and the region between the main reflector and ground. Figure 1. EM Fields as a Function of Distance For parabolic aperture antennas with circular cross sections, such as the antenna under study, the near-field, far- field and transition region distances are calculated as follows: Parameter Value Unit Formula 2 Near Field Distance: 67.800 m Rnf = D /(4λ) Distance to Far Field: 162.720 m Rff = 0.60D2/(λ) Distance of Trasition Region 67.800 m Rt = Rnf The distance in the transition region is between the near and far fields. Thus, Rnf ≤ Rt ≤ Rff . However, the power density in the transition region will not exceed the power density in the near-field. Therefore, for purposes of the present analysis, the distance of the transition region can equate the distance to the near-field. Power Flux Density Calculations The power flux density is considered to be at a maximum through the entire length of the near-field. This region is contained within a cylindrical volume with a diameter, D, equal to the diameter of the antenna. In the transition region and the far-field, the power density decreases inversely with the square of the distance. The following equations are used to calculate power density in these regions. 2 of 3

RigNet Satcom, Inc. EXHIBIT A Parameter Value Unit Symbol Formula 2 Power Density in the Near-Field 3.268 mW/cm S nf 16.0 η P /(πD 2) 2 Power Density in the Far-Field 1.400 mW/cm S ff GP /(4π R ff2) 2 Power Density in the Trans. Region 3.268 mW/cm St Snf R nf /(R t) The region between the main reflector and the subreflector is confined within a conical shape defined by the feed assembly. The most common feed assemblies are waveguide flanges. This energy is determined as follows: Parameter Value Unit Symbol Formula 2 Power Density at the Feed Flange 1338.0 mW/cm S fa 4P / a The power density in the main reflector is determined similarly to the power density at the feed flange; except that the area of the reflector is used. Parameter Value Unit Symbol Formula 2 Power Density at Main Reflector 4.951 mW/cm S surface 4P / A The power density between the reflector and ground, assuming uniform illumination of the reflector surface, is calculated as follows: Parameter Value Unit Symbol Formula Power Density between Reflector and Ground 1.238 mW/cm2 Sg P /A Table 1 summarizes the calculated power flux density values for each region. In a controlled environment, the only regions that exceed FCC limitations are shown below. These regions are only accessible by trained technicians who, as a matter of procedure, turn off transmit power before performing any work in these areas. Controlled Environment Power Densities mW/cm2 (5 mW/cm2) Far Field Calculation 1.400 Satisfies FCC Requirements Near Field Calculation 3.268 Satisfies FCC Requirements Transition Region 3.268 Satisfies FCC Requirements Region between Main and Subreflector 1338.0 Exceeds Limitations Main Reflector Region 4.951 Satisfies FCC Requirements Region between Main Reflector and Ground 1.238 Satisfies FCC Requirements Table 1. Power Flux Density for Each Region In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in 47 C.F.R. § 1.1310. 3 of 3

RigNet Satcom, Inc. EXHIBIT A Radiation Hazard Study SkyWare Global 845 (SF 840) This study analyzes the potential Radio Frequency (RF) human exposure levels caused by the Electro Magnetic (EM) fields of the above-captioned antenna. The mathematical analysis performed below complies with the methods described in the Federal Communications Commission Office of Engineering and Technology Bulletin No. 65 (1985 rev. 1997) R&O 96-326. Maximum Permisible Exposure There are two separate levels of exposure limits. The first applies to persons in the general population who are in an uncontrolled environment. The second applies to trained personnel in a controlled environment. According to 47 C.F.R. § 1.1310, the Maximum Permissible Exposure (MPE) limits for frequencies above 1.5 GHz are as follows: • General Population / Uncontrolled Exposure 1.0 mW/cm2 • Occupational / Controlled Exposure 5.0 mW/cm2 The purpose of this study is to determine the power flux density levels for the earth station under study as compared with the MPE limits. This comparison is done in each of the following regions: 1. Far-field region 2. Near-field region 3. Transition region 4. The region between the feed and the antenna surface 5. The main reflector region 6. The region between the antenna edge and the ground Input Parameters The following input parameters were used in the calculations: Parameter Value Unit Symbol Atenna Diameter: 0.84 m D Antenna Transmit Gain: 40.30 dBi G Trasmit Frequency: 14300 MHz f Feed Flange Diameter: 8.25 cm d Power Input to the Antenna: 10.20 W P Calculated Parameters The following values were calculated using the above input parameters and the corresponding formulas. Parameter Value Unit Symbol Formula 2 2 Anenna Surface Area: 0.55 m A πD /4 2 2 Area of Feed Flange: 53.46 cm a πd /4 2 2 2 Antenna Efficiency: 0.68 η Gλ /( π D ) G /10 Gain Factor: 10715.19 g 10 Wavelength: 0.0210 m λ 300/ f 1 of 3

RigNet Satcom, Inc. EXHIBIT A Behavior of EM Fields as a Function of Distance The behavior of the characteristics of EM fields varies depending on the distance from the radiating antenna. These characteristics are analyzed in three primary regions: the near-field region, the far-field region and the transition region. Of interest also are the region between the antenna main reflector and the subreflector, the region of the main reflector area and the region between the main reflector and ground. Figure 1. EM Fields as a Function of Distance For parabolic aperture antennas with circular cross sections, such as the antenna under study, the near-field, far- field and transition region distances are calculated as follows: Parameter Value Unit Formula 2 Near Field Distance: 8.408 m Rnf = D /(4λ) Distance to Far Field: 20.180 m Rff = 0.60D2/(λ) Distance of Trasition Region 8.408 m Rt = Rnf The distance in the transition region is between the near and far fields. Thus, Rnf ≤ Rt ≤ Rff . However, the power density in the transition region will not exceed the power density in the near-field. Therefore, for purposes of the present analysis, the distance of the transition region can equate the distance to the near-field. Power Flux Density Calculations The power flux density is considered to be at a maximum through the entire length of the near-field. This region is contained within a cylindrical volume with a diameter, D, equal to the diameter of the antenna. In the transition region and the far-field, the power density decreases inversely with the square of the distance. The following equations are used to calculate power density in these regions. 2 of 3

RigNet Satcom, Inc. EXHIBIT A Parameter Value Unit Symbol Formula 2 Power Density in the Near-Field 4.986 mW/cm S nf 16.0 η P /(πD 2) 2 Power Density in the Far-Field 2.136 mW/cm S ff GP /(4π R ff2) 2 Power Density in the Trans. Region 4.986 mW/cm St Snf R nf /(R t) The region between the main reflector and the subreflector is confined within a conical shape defined by the feed assembly. The most common feed assemblies are waveguide flanges. This energy is determined as follows: Parameter Value Unit Symbol Formula 2 Power Density at the Feed Flange 763.2 mW/cm S fa 4P / a The power density in the main reflector is determined similarly to the power density at the feed flange; except that the area of the reflector is used. Parameter Value Unit Symbol Formula 2 Power Density at Main Reflector 7.362 mW/cm S surface 4P / A The power density between the reflector and ground, assuming uniform illumination of the reflector surface, is calculated as follows: Parameter Value Unit Symbol Formula Power Density between Reflector and Ground 1.841 mW/cm2 Sg P /A Table 1 summarizes the calculated power flux density values for each region. In a controlled environment, the only regions that exceed FCC limitations are shown below. These regions are only accessible by trained technicians who, as a matter of procedure, turn off transmit power before performing any work in these areas. Controlled Environment Power Densities mW/cm2 (5 mW/cm2) Far Field Calculation 2.136 Satisfies FCC Requirements Near Field Calculation 4.986 Satisfies FCC Requirements Transition Region 4.986 Satisfies FCC Requirements Region between Main and Subreflector 763.2 Exceeds Limitations Main Reflector Region 7.362 Exceeds Limitations Region between Main Reflector and Ground 1.841 Satisfies FCC Requirements Table 1. Power Flux Density for Each Region In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in 47 C.F.R. § 1.1310. 3 of 3

RigNet Satcom, Inc. EXHIBIT A Radiation Hazard Study SkyWare Global 123 This study analyzes the potential Radio Frequency (RF) human exposure levels caused by the Electro Magnetic (EM) fields of the above-captioned antenna. The mathematical analysis performed below complies with the methods described in the Federal Communications Commission Office of Engineering and Technology Bulletin No. 65 (1985 rev. 1997) R&O 96-326. Maximum Permisible Exposure There are two separate levels of exposure limits. The first applies to persons in the general population who are in an uncontrolled environment. The second applies to trained personnel in a controlled environment. According to 47 C.F.R. § 1.1310, the Maximum Permissible Exposure (MPE) limits for frequencies above 1.5 GHz are as follows: • General Population / Uncontrolled Exposure 1.0 mW/cm2 • Occupational / Controlled Exposure 5.0 mW/cm2 The purpose of this study is to determine the power flux density levels for the earth station under study as compared with the MPE limits. This comparison is done in each of the following regions: 1. Far-field region 2. Near-field region 3. Transition region 4. The region between the feed and the antenna surface 5. The main reflector region 6. The region between the antenna edge and the ground Input Parameters The following input parameters were used in the calculations: Parameter Value Unit Symbol Atenna Diameter: 1.2 m D Antenna Transmit Gain: 43.30 dBi G Trasmit Frequency: 14300 MHz f Feed Flange Diameter: 10.80 cm d Power Input to the Antenna: 21.30 W P Calculated Parameters The following values were calculated using the above input parameters and the corresponding formulas. Parameter Value Unit Symbol Formula 2 2 Anenna Surface Area: 1.13 m A πD /4 2 2 Area of Feed Flange: 91.61 cm a πd /4 2 2 2 Antenna Efficiency: 0.66 η Gλ /( π D ) G /10 Gain Factor: 21379.62 g 10 Wavelength: 0.0210 m λ 300/ f 1 of 3

RigNet Satcom, Inc. EXHIBIT A Behavior of EM Fields as a Function of Distance The behavior of the characteristics of EM fields varies depending on the distance from the radiating antenna. These characteristics are analyzed in three primary regions: the near-field region, the far-field region and the transition region. Of interest also are the region between the antenna main reflector and the subreflector, the region of the main reflector area and the region between the main reflector and ground. Figure 1. EM Fields as a Function of Distance For parabolic aperture antennas with circular cross sections, such as the antenna under study, the near-field, far- field and transition region distances are calculated as follows: Parameter Value Unit Formula 2 Near Field Distance: 17.160 m Rnf = D /(4λ) Distance to Far Field: 41.184 m Rff = 0.60D2/(λ) Distance of Trasition Region 17.160 m Rt = Rnf The distance in the transition region is between the near and far fields. Thus, Rnf ≤ Rt ≤ Rff . However, the power density in the transition region will not exceed the power density in the near-field. Therefore, for purposes of the present analysis, the distance of the transition region can equate the distance to the near-field. Power Flux Density Calculations The power flux density is considered to be at a maximum through the entire length of the near-field. This region is contained within a cylindrical volume with a diameter, D, equal to the diameter of the antenna. In the transition region and the far-field, the power density decreases inversely with the square of the distance. The following equations are used to calculate power density in these regions. 2 of 3

RigNet Satcom, Inc. EXHIBIT A Parameter Value Unit Symbol Formula 2 Power Density in the Near-Field 4.988 mW/cm S nf 16.0 η P /(πD 2) 2 Power Density in the Far-Field 2.137 mW/cm S ff GP /(4π R ff2) 2 Power Density in the Trans. Region 4.988 mW/cm St Snf R nf /(R t) The region between the main reflector and the subreflector is confined within a conical shape defined by the feed assembly. The most common feed assemblies are waveguide flanges. This energy is determined as follows: Parameter Value Unit Symbol Formula 2 Power Density at the Feed Flange 930.0 mW/cm S fa 4P / a The power density in the main reflector is determined similarly to the power density at the feed flange; except that the area of the reflector is used. Parameter Value Unit Symbol Formula 2 Power Density at Main Reflector 7.533 mW/cm S surface 4P / A The power density between the reflector and ground, assuming uniform illumination of the reflector surface, is calculated as follows: Parameter Value Unit Symbol Formula Power Density between Reflector and Ground 1.883 mW/cm2 Sg P /A Table 1 summarizes the calculated power flux density values for each region. In a controlled environment, the only regions that exceed FCC limitations are shown below. These regions are only accessible by trained technicians who, as a matter of procedure, turn off transmit power before performing any work in these areas. Controlled Environment Power Densities mW/cm2 (5 mW/cm2) Far Field Calculation 2.137 Satisfies FCC Requirements Near Field Calculation 4.988 Satisfies FCC Requirements Transition Region 4.988 Satisfies FCC Requirements Region between Main and Subreflector 930.0 Exceeds Limitations Main Reflector Region 7.533 Exceeds Limitations Region between Main Reflector and Ground 1.883 Satisfies FCC Requirements Table 1. Power Flux Density for Each Region In conclusion, the results show that the antenna, in a controlled environment, and under the proper mitigation procedures, meets the guidelines specified in 47 C.F.R. § 1.1310. 3 of 3


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