Attachment Exhibits A through C

This document pretains to SES-MOD-20150421-00250 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2015042100250_1085001

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit A EXHIBIT A – APPLICATION SUMMARY 1.0 - Description of Application The instant modification application seeks to add one transmitting hub antenna to Call Sign E920640. Specifically, ITC Global (“ITC”) seeks to add an ASC Signal 4.6 meter ES46P to the aforementioned earth station.1 In addition, the instant modification applications seeks to correct a typographical error related to the coordinates of Call Sign E920640. An earlier modification application incorrectly identified the coordinates for fixed, hub earth station antennas operated under Call Sign E920640 as 28° 58’ 13.0” N / 90° 12’ 12.0” W. These coordinates should be revised to 29° 58’ 13.0” N / 90° 12’ 12.0” W. The Schedule B associated with the instant modification application reflects the accurate coordinates.2 ITC does not seek to otherwise modify any of the technical or carrier parameters related to any existing antenna operating under Call Sign E920640. 2.0 - Exhibit Table of Contents Exhibit Description Total Pages Exhibit A Application Summary & Exhibit Table of Contents 1 Exhibit B 4.6 Meter Ku-band Radiation Hazard Analysis 8 Exhibit C FAA Notification 1 1 The proposed new 4.6 meter earth station will be located within one (1) second longitude and latitude of the existing coordinates for Call Sign E920640. 2 Given that no C-band operations are associated with Call Sign E920640, correcting the coordinates of the hub earth station does not require coordination of existing or new antennas.

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B Radiation Hazard Analysis 4.6m ASC Signal This analysis predicts the radiation levels around a proposed earth station complex, comprised of one (reflector) type antennas. This report is developed in accordance with the prediction methods contained in OET Bulletin No. 65, Evaluating Compliance with FCC Guidelines for Human Exposure to Radio Frequency Electromagnetic Fields, Edition 97-01, pp 26-30. The maximum level of non-ionizing radiation to which employees may be exposed is limited to a power density level of 5 milliwatts per square centimeter (5 mW/cm2) averaged over any 6 minute period in a controlled environment and the maximum level of non-ionizing radiation to which the general public is exposed is limited to a power density level of 1 milliwatt per square centimeter (1 mW/cm2) averaged over any 30 minute period in a uncontrolled environment. Note that the worse-case radiation hazards exist along the beam axis. Under normal circumstances, it is highly unlikely that the antenna axis will be aligned with any occupied area since that would represent a blockage to the desired signals, thus rendering the link unusable. Earth Station Technical Parameter Table Antenna Diameter (Df) 4.6 meters Antenna Surface Area (Sa) 16.62sq. meters Subreflector Diameter (Dsr) 0.4790 meters Subreflector Area (Ssr) 0.1802 sq. meters Antenna Isotropic Gain (Ges) 55.0 dBi Number of Identical Adjacent Antennas 1 Nominal Antenna Efficiency (η) 67.00% Nominal Frequency (f) 14.25 GHz Nominal Wavelength (λ) 0.0210 meters Total Feed Input Power (P) 113.00 Watts Near Field Limit Rnf = D²/4λ = 251.45 meters Far Field Limit Rff = 0.6 D²/λ = 603.5 meters Transition Region Rnf to Rff In the following sections, the power density in the above regions, as well as other critically important areas will be calculated and evaluated. The calculations are done in the order discussed in OET Bulletin 65. 1.0 At the Antenna Surface The power density at the reflector surface can be calculated from the expression: PDrefl = 4P/Sa = 2.720 mW/cm² (1) Where: P = total power at feed, milliwatts Sa = Total area of reflector, sq. cm In the normal range of transmit powers for satellite antennas, the power densities at or around the reflector surface is expected to exceed safe levels. This area will not be accessible to the general public. Operators and technicians shall receive training specifying this area as a high exposure 1

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B area. Procedures will be established that will assure that all transmitters are rerouted or turned off before access by maintenance personnel to this area is possible. 2.0 Between Main Reflector and Subreflector The power density between the main reflector and the subreflector can be calculated from the expression: PDsr = 4P/Ssr = 250.829 mW/cm² (2) Where: P = total power at the feed, milliwatts Sr = Total area of the subreflector, sq. cm Transmissions from the feed horn are directed toward the subreflector surface, and are confined within a conical shape defined by the feed horn. The energy between the feed horn and subreflector is conceded to be in excess of any limits for maximum permissible exposure. This area will not be accessible to the general public. Operators and technicians shall receive training specifying this area as a high exposure area. Procedures will be established that will assure that all transmitters are rerouted or turned off before access by maintenance personnel to this area is possible. 3.0 On-Axis Near Field Region The geometrical limits of the radiated power in the near field approximate a cylindrical volume with a diameter equal to that of the antenna. In the near field, the power density is neither uniform nor does its value vary uniformly with distance from the antenna. For the purpose of considering radiation hazard it is assumed that the on-axis flux density is at its maximum value throughout the length of this region. The length of this region, i.e., the distance from the antenna to the end of the near field, is computed as Rnf above. The maximum power density in the near field is given by: PDnf = (16η P)/(π D²) = 1.822 mW/cm² (3) from 0 to 251.45 meters Evaluation Uncontrolled Environment: Does Not Meet Uncontrolled Limits Controlled Environment: Meets Controlled Limits 4.0 On-Axis Transition Region The transition region is located between the near and far field regions. As stated in Bulletin 65, the power density begins to vary inversely with distance in the transition region. The maximum power density in the transition region will not exceed that calculated for the near field region, and the transition region begins at that value. The maximum value for a given distance within the transition region may be computed for the point of interest according to: Rsafe = (PDnf)(Rnf)/R = dependent on R (4) 2

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B where: PDnf = near field power density Rnf = near field distance R = distance to point of interest For: 251.45 < R < 603.5 meters We use Eq (4) to determine the safe on-axis distances required for the two occupancy conditions: Evaluation Uncontrolled Environment Safe Operating Distance, (meters), Rsafeu: 458.2 Controlled Environment Safe Operating Distance, (meters), Rsafec: 91.6 5.0 On-Axis Far-Field Region The on- axis power density in the far field region (PDff) varies inversely with the square of the distance as follows: PDff = PGes/(4πR²) = dependent on R (5) where: P = total power at feed Ges = Numeric Antenna gain in the direction of interest relative to isotropic radiator R = distance to the point of interest For: R > Rff = 603.5 meters PDff = 0.781 mW/cm² at Rff We use Eq (5) to determine the safe on-axis distances required for the two occupancy conditions: Evaluation Uncontrolled Environment Safe Operating Distance,(meters), Rsafeu : See Section 3 Controlled Environment Safe Operating Distance,(meters), Rsafec : See Section 3 6.0 Off-Axis Levels at the Far Field Limit and Beyond In the far field region, the power is distributed in a pattern of maxima and minima (sidelobes) as a function of the off-axis angle between the antenna center line and the point of interest. Off-axis power density in the far field can be estimated using the antenna radiation patterns prescribed for the antenna in use. Usually this will correspond to the antenna gain pattern envelope defined by the FCC or the ITU, which takes the form of: Goa = 32 - 25log(Θ) for Θ from 1 to 48 degrees; -10 dBi from 48 to 180 degrees (Applicable for commonly used satellite transmit antennas) Considering that satellite antenna beams are aimed skyward, power density in the far field will usually not be a problem except at low look angles. In these cases, the off axis gain reduction may be used to further reduce the power density levels. 3

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B For example: At one (1) degree off axis at the far-field limit, we can calculate the power density as: Goa = 32 - 25log(1) = 32 - 0 dBi = 1585 numeric PD1 deg off-axis = PDffoa 1585/G = 0.0039mW/cm² (6) 7.0 Off-Axis power density in the Near Field and Transitional Regions According to Bulletin 65, off-axis calculations in the near field may be performed as follows: assuming that the point of interest is at least one antenna diameter removed from the center of the main beam, the power density at that point is at least a factor of 100 (20 dB) less than the value calculated for the equivalent on-axis power density in the main beam. Therefore, for regions at least D meters away from the center line of the dish, whether behind, below, or in front under of the antenna's main beam, the power density exposure is at least 20 dB below the main beam level as follows: PDnf(off-axis) = PDnf /100 = 0.01822 mW/cm² at D off axis (7) See Section 9 for the calculation of the distance vs. elevation angle required to achieve this rule for a given object height. 8.0 Region Between the Antenna and Ground The power density between the antenna reflector and the ground can be calculated from the expression: PDg = P/A = 0.67994 mW/cm² (8) Where: P = total power at feed, milliwatts A = Total area of reflector, sq. cm 9.0 Evaluation of Safe Occupancy Area in Front of Antenna The distance (S) from a vertical axis passing through the dish center to a safe off axis location in front of the antenna can be determined based on the dish diameter rule (Item 7.0). Assuming a flat terrain in front of the antenna, the relationship is: S = (D/ sin α) + (2h - D - 2)/(2 tan α) (9) Where: α = minimum elevation angle of antenna D = dish diameter in meters h = maximum height of object to be cleared, meters For distances equal or greater than determined by equation (9), the radiation hazard will be below safe levels for all but the most powerful stations (> 4 kilowatts RF at the feed). For D= 4.6 meters h= 2.0 meters 4

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B Then: α S 10 19.1 meters 15 12.9 meters 20 9.9 meters 25 8.1 meters 30 6.9 meters Suitable fencing or other barrier may be provided to prevent casual occupancy of the area in front of the antenna within the limits prescribed above at the lowest elevation angle required. Summary The earth station site will be protected from uncontrolled access with suitable fencing and other barrier walls. There will also be proper emission warning signs placed and all operating personnel will be aware of the human exposure levels at and around the earth station. The applicant agrees to abide by the conditions specified in Condition 5208 provided below: Condition 5208 - The licensee shall take all necessary measures to ensure that the antenna does not create potential exposure of humans to radiofrequency radiation in excess of the FCC exposure limits defined in 47 CFR 1.1307(b) and 1.1310 wherever such exposures might occur. Measures must be taken to ensure compliance with limits for both occupational/controlled exposure and for general population/uncontrolled exposure, as defined in these rule sections. Compliance can be accomplished in most cases by appropriate restrictions such as fencing. Requirements for restrictions can be determined by predictions based on calculations, modeling or by field measurements. The FCC's OET Bulletin 65 (available on-line at www.fcc.gov/oet/rfsafety) provides information on predicting exposure levels and on methods for ensuring compliance, including the use of warning and alerting signs and protective equipment for worker. The following table summarizes all of the above calculations: 5

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B Table Summary of All RadHaz Parameters 4.6m ASC Signal Parameter Abbr. Units Formula Dish # Hub Antenna Diameter Df 4.6 meters Antenna Centerline h 2.8 meters Antenna Surface Area Sa 16.62 meters2 (π * Df2 )/ 4 Antenna Ground Elevation GE 2.0 meters Frequency of Operation f 14.25 GHz Wavelength λ 0.0210 meters c/f Subreflector Diameter Dsr 0.4790 meters Area of Subreflector Ssr 0.1802 meters² (π*Dsr²)/4 HPA Output Power PHPA 113.0 watts HPA to Antenna Loss Ltx 0.0 dB Transmit Power at Flange P 20.5 dBW 10 * Log(PHPA) - Ltx 113.00 watts Antenna Gain Ges 55.0 dBi 316139.2 n/a PI π 3.1415927 n/a Antenna Aperture Efficiency η 67.00% n/a Ges / (PI * Df /λ)2 1. Reflector Surface Region Calculations Reflector Surface Power Density Pdrefl 27.20 W/m2 (16 * P)/(π * D2) 2.720 mW/cm2 Does Not Meet Uncontrolled Limits Meets Controlled Limits 2. Region Between Main Reflector and Subreflector Main Reflector and Subreflector Power PDsr 2508.29 W/m2 4*P/Ssr Density 2 250.829 mW/cm Does Not Meet Uncontrolled Limits Does Not Meet Controlled Limits 3. On-Axis Near Field Calculations Extent of Near Field Rn 251.45 meters D2 / (4 *λ) 824.75 feet Near Field Power Density PDnf 18.22 W/m2 (16 * η * P )/ (π *D2) 1.822 mW/cm2 Does Not Meet Uncontrolled Limits Meets Controlled Limits 4. On-Axis Transition Region Calculations Extent of Transition Region (min) Rtr 251.45 meters D2 / (4 *λ) 6

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B Extent of Transition Region (min) 824.75 feet Extent of Transition Region (max) Rtr 603.48 meters (0.6 * D2) /λ Extent of Transition Region (max) 1979.41 feet Worst Case Transition Region Power PDtr 18.22 W/m2 (16 *η * P)/ (π * D2) Density 1.822 mW/cm2 Does Not Meet Uncontrolled Limits Meets Controlled Limits Uncontrolled Environment Safe Rsu 458.2 m =(PDnf)*(Rnf)/Rsu Operating Distance Controlled Environment Safe Operating Rsc 91.6 m =(PDnf)*(Rnf)/Rsc Distance 5. On-Axis Far Field Calculations Distance to the Far Field Region Rf 603.5 meters (0.6 * D2) /λ 1979.41 feet On-Axis Power Density in the Far Field PDff 7.81 W/m2 (Ges * P) / (4 * π * Rf2) 0.781 mW/cm2 Meets Controlled Limits Meets Controlled Limits 6. Off-Axis Levels at the Far Field Limit and Beyond Reflector Surface Power Density Pdffoa 0.039 W/m2 (Ges * P) / (4 * π * Rf2)*(Goa/Ges) Goa/Ges at example angle θ 1 degree 0.005 Goa = 32 - 25*log(θ) 2 0.0039 mW/cm Meets Controlled Limits 7. Off-axis Power Density in the Near Field and Transitional Regions Calculations Power density 1/100 of Wn for one Pdnfoa 0.1822 W/m2 ((16 * η * P )/ (π *D2))/100 diameter removed 0.01822 mW/cm2 Meets Controlled Limits 8. Region Between Antenna and Ground Calculations Main Reflector and Ground Power PDg 6.79944 W/m2 (P/Sa) Density 2 0.67994 mW/cm Meets Controlled Limits 9 . Off-Axis Safe Distances from Earth Station S = (D/ sin α) + (2h - D - 2)/(2 tan α) α = minimum elevation angle of antenna 10 deg h = maximum height of object to be cleared, meters 2.0 m GD = Ground Elevation Delta antenna-obstacle 0.0 m elevation angle 10 19.1 m 15 12.9 m 20 9.9 m 25 8.1 m 30 6.9 m 2 Note: Maximum FCC power density limits for 14 GHz is 1 mW/cm for general population/uncontrolled exposure as per FCC OE&T Bulletin No. 65, Edition 97-01 August 1997, Appendix A page 67. 7

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit B 8

ITC Global Modification Adding 4.6 Meter Antennas to E920640 Exhibit C EXHIBIT C – FAA NOTIFICATION Pursuant to 47. C.F.R. §17.14 (b), FAA notification is not necessary because the proposed 4.6 meter antennas is less than 6.1 meters in height and will not adversely affect safety in air navigation. A/76746907.1


Document Created: 2015-04-21 11:43:45
Document Modified: 2015-04-21 11:43:45
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC