Supplemental Letter

SUPPLEMENT submitted by AT&T Corp.

Supplemental Letter

2018-11-14

This document pretains to SES-MOD-20181017-03680 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2018101703680_1572916

Jennifer D. Hindin 202.719.4975 jhindin@wileyrein.com VIA ELECTRONIC FILING November 14, 2018 Marlene H. Dortch Office of the Secretary Federal Communications Commission 445 12th Street, SW Washington, DC 20554 Re: AT&T Corp. Application for Modification of Call Sign E090084 to Add New Antennas, IBFS File No. SES‐MOD‐INTR2018‐09343 Dear Ms. Dortch: AT&T Corp., by its undersigned counsel, respectfully notifies the Federal Communications Commission that the coordination process for the above‐captioned earth station modification application has been completed. Attached is the final Frequency Coordination and Interference Analysis Report for inclusion in the FCC’s files for the above‐referenced earth station application. Should you have any questions regarding this filing, please do not hesitate to contact me. Respectfully Submitted, /s/ Jennifer D. Hindin Jennifer D. Hindin Counsel for AT&T Corp. 1776 K Street NW | Washington, DC 20006 | 202.719.7000 wileyrein.com

Attachment Coordination Report for 13.1-meter Antenna

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for AT&T Corp. HAMPTON, GA Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 October 31, 2018

TABLE OF CONTENTS 1. CONCLUSIONS ............................................................................................................................................ 3 2. SUMMARY OF RESULTS ............................................................................................................................ 4 3. SUPPLEMENTAL SHOWING ....................................................................................................................... 5 4. EARTH STATION COORDINATION DATA .................................................................................................. 7 5. CERTIFICATION ......................................................................................................................................... 11 Frequency Coordination and Interference Analysis Report 10/31/2018 Page 2 of 11

1. CONCLUSIONS An interference study considering all existing, proposed and prior coordinated microwave facilities within the coordination contours of the proposed earth station demonstrates that this site will operate satisfactorily with the common carrier microwave environment. Further, there will be no restrictions of its operation due to interference considerations. Frequency Coordination and Interference Analysis Report 10/31/2018 Page 3 of 11

2. SUMMARY OF RESULTS A number of great circle interference cases were identified during the interference study of the proposed earth station. Each of the cases, which exceeded the interference objective on a line-of-sight basis, was profiled and the propagation losses estimated using NBS TN101 (Revised) techniques. The losses were found to be sufficient to reduce the signal levels to acceptable magnitudes in every case. Frequency Coordination and Interference Analysis Report 10/31/2018 Page 4 of 11

3. SUPPLEMENTAL SHOWING Pursuant to Part 25.203(c) of the FCC Rules and Regulations, the satellite earth station proposed in this application was coordinated by Comsearch using computer techniques and in accordance with Part 25 of the FCC Rules and Regulations. Coordination data for this earth station was sent to the below listed carriers with a letter dated 10/15/2018. Company Alabama Great Southern Railroad Company Alltel Communications LLC - Alabama Athens Cellular, Inc. Athens-Clark County Unified Government Baldwin County Sheriffs Office Barrow County Emergency Services Bartow, County of Calhoun County 911 Cellco Partnership - Georgia Mkt Central of Georgia Railway Company City of Phenix City Clayton, County of Cobb, County of Conterra Ultra Broadband, LLC Conyers, City of Coweta County DeKalb County Police Department Diverse Power Inc Flint Electric Membership Corporation Floyd County Forsyth, County of Fulton, County of Georgia Southern and Florida Railway Co Georgia System Operations Corporation Greene County E911 Gwinnett County Government Hall County 9-1-1 Henry County Emergency Communications Houston County Water Department Jackson Electric Membership Corporation Macon-Bibb County Government Monroe, County of (GA) New Cingular Wireless PCS LLC - AL, MS New Cingular Wireless PCS LLC - Georgia Norfolk Southern Railway Oconee County Sheriffs Office Olympic Wireless, LLC One Ring Networks, Inc. PowerSouth Energy Cooperative Public Service Telephone Company Public Service Towers, Inc. Frequency Coordination and Interference Analysis Report 10/31/2018 Page 5 of 11

Southern Company Services, Inc. Southwestco Wireless LP (Georgia 5) T-Mobile License LLC Tallapoosa, County of Troy University Verizon Wireless (VAW) LLC (Georgia) Verizon Wireless (VAW) LLC - Alabama Verizon Wireless of The East LP - (GA) Verizon Wireless of the East LP- Alabama Walton County Georgia Frequency Coordination and Interference Analysis Report 10/31/2018 Page 6 of 11

4. EARTH STATION COORDINATION DATA This section presents the data pertinent to frequency coordination of the proposed earth station that was circulated to all carriers within its coordination contours. Frequency Coordination and Interference Analysis Report 10/31/2018 Page 7 of 11

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 10/31/2018 Job Number: 181015COMSGE18 Administrative Information Status ENGINEER PROPOSAL Call Sign E090084 Licensee Code P1175 Licensee Name AT&T Corp. Site Information HAMPTON, GA Venue Name Latitude (NAD 83) 33° 22' 41.4" N Longitude (NAD 83) 84° 17' 51.7" W Climate Zone A Rain Zone 1 Ground Elevation (AMSL) 268.2 m / 879.9 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 50° W to 139° West Longitude Azimuth Range 128.9° to 248.7° Corresponding Elevation Angles 36.7° / 20.7° Antenna Centerline (AGL) 5.49 m / 18.0 ft Antenna Information Receive - FCC32 Transmit - FCC32 Manufacturer Gen Dynamics Gen Dynamics Model Satcom Satcom Gain / Diameter 53.5 dBi / 13.1 m 57.3 dBi / 13.1 m 3-dB / 15-dB Beamwidth 0.38° / 0.76° 0.26° / 0.52° Max Available RF Power (dBW/4 kHz) -14.0 (dBW/MHz) 10.0 Maximum EIRP (dBW/4 kHz) 43.3 (dBW/MHz) 67.3 Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Frequency Information Receive 4.0 GHz Transmit 6.1 GHz Emission / Frequency Range (MHz) 1M50G7W - 36M0G7W / 3700.0 - 4200.0 1M50G7W - 36M0G7W / 5925.0 - 5959.0 1M50G7W - 36M0G7W / 5991.0 - 6211.0 1M50G7W - 36M0G7W / 6243.0 - 6425.0 Max Great Circle Coordination Distance 349.5 km / 217.2 mi 160.5 km / 99.7 mi Precipitation Scatter Contour Radius 577.7 km / 358.9 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 10/31/2018 Page 8 of 11

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values HAMPTON, GA Licensee Name AT&T Corp. Latitude (NAD 83) 33° 22' 41.4" N Longitude (NAD 83) 84° 17' 51.7" W Ground Elevation (AMSL) 268.2 m / 879.9 ft Antenna Centerline (AGL) 5.49 m / 18.0 ft Antenna Model Gen Dynamics 13.1 meter Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -14.0 (dBW/4 kHz) Receive 4.0 GHz Transmit 6.1 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 0 0.49 109.91 -10.00 250.90 -10.00 109.49 5 0.57 114.56 -10.00 245.40 -10.00 105.63 10 0.59 112.99 -10.00 243.86 -10.00 104.51 15 0.65 109.13 -10.00 240.34 -10.00 101.92 20 0.65 105.19 -10.00 240.09 -10.00 101.74 25 0.67 101.20 -10.00 239.10 -10.00 101.00 30 0.70 97.19 -10.00 237.39 -10.00 100.00 35 0.66 93.15 -10.00 239.60 -10.00 101.37 40 0.64 89.10 -10.00 241.08 -10.00 102.47 45 0.56 85.07 -10.00 246.17 -10.00 106.19 50 0.54 81.05 -10.00 247.21 -10.00 106.94 55 0.44 77.06 -10.00 256.73 -10.00 113.61 60 0.32 73.13 -10.00 270.89 -10.00 123.32 65 0.00 69.32 -10.00 285.28 -10.00 132.84 70 0.00 65.51 -10.00 285.28 -10.00 132.84 75 0.00 61.78 -10.00 285.28 -10.00 132.84 80 0.00 58.16 -10.00 285.28 -10.00 132.84 85 0.00 54.68 -10.00 285.28 -10.00 132.84 90 0.00 51.36 -10.00 285.28 -10.00 132.84 95 0.00 48.24 -10.00 285.28 -10.00 132.84 100 0.00 45.38 -9.42 288.99 -9.42 133.15 105 0.00 42.82 -8.79 293.09 -8.79 134.89 110 0.00 40.62 -8.22 296.87 -8.22 136.50 115 0.00 38.85 -7.73 300.10 -7.73 137.89 120 0.00 37.57 -7.37 302.56 -7.37 138.96 125 0.00 36.83 -7.15 304.03 -7.15 139.60 130 0.00 36.66 -7.11 304.35 -7.11 139.74 135 0.00 37.09 -7.23 303.51 -7.23 139.37 140 0.00 38.07 -7.51 301.58 -7.51 138.53 145 0.00 39.58 -7.94 298.75 -7.94 137.31 150 0.45 41.16 -8.36 264.72 -8.36 116.62 155 0.50 43.53 -8.97 256.03 -8.97 111.54 160 0.28 46.14 -9.60 277.79 -9.60 127.34 165 0.21 48.21 -10.00 283.76 -10.00 131.85 170 0.00 49.92 -10.00 285.28 -10.00 132.84 175 0.00 50.86 -10.00 285.28 -10.00 132.84 180 0.22 50.96 -10.00 282.57 -10.00 131.07 185 0.24 50.63 -10.00 280.34 -10.00 129.61 Frequency Coordination and Interference Analysis Report 10/31/2018 Page 9 of 11

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values HAMPTON, GA Licensee Name AT&T Corp. Latitude (NAD 83) 33° 22' 41.4" N Longitude (NAD 83) 84° 17' 51.7" W Ground Elevation (AMSL) 268.2 m / 879.9 ft Antenna Centerline (AGL) 5.49 m / 18.0 ft Antenna Model Gen Dynamics 13.1 meter Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -14.0 (dBW/4 kHz) Receive 4.0 GHz Transmit 6.1 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 190 0.29 49.65 -10.00 274.52 -10.00 125.76 195 0.34 48.10 -10.00 267.90 -10.00 121.30 200 0.00 46.37 -9.65 287.49 -9.65 133.77 205 0.00 43.90 -9.06 291.31 -9.06 134.13 210 0.00 41.08 -8.34 296.05 -8.34 136.15 215 0.00 37.97 -7.49 301.77 -7.49 138.61 220 0.00 34.63 -6.49 308.62 -6.49 141.62 225 0.00 31.09 -5.32 317.44 -5.32 145.28 230 0.00 27.64 -4.04 326.56 -4.04 149.46 235 0.00 24.68 -2.81 335.53 -2.81 153.68 240 0.00 22.40 -1.76 343.31 -1.76 157.42 245 0.00 21.03 -1.07 348.45 -1.07 159.93 250 0.00 20.76 -0.93 349.54 -0.93 160.47 255 0.00 21.61 -1.37 346.24 -1.37 158.85 260 0.00 23.47 -2.26 339.55 -2.26 155.60 265 0.00 26.13 -3.43 331.00 -3.43 151.53 270 0.00 29.36 -4.69 321.86 -4.69 147.29 275 0.00 33.00 -5.96 312.88 -5.96 143.23 280 0.00 36.93 -7.19 303.82 -7.19 139.51 285 0.00 41.06 -8.34 296.08 -8.34 136.16 290 0.00 45.34 -9.41 289.04 -9.41 133.18 295 0.00 49.73 -10.00 285.28 -10.00 132.84 300 0.00 54.20 -10.00 285.28 -10.00 132.84 305 0.00 58.72 -10.00 285.28 -10.00 132.84 310 0.00 63.29 -10.00 285.28 -10.00 132.84 315 0.00 67.90 -10.00 285.28 -10.00 132.84 320 0.00 72.53 -10.00 285.28 -10.00 132.84 325 0.00 77.19 -10.00 285.28 -10.00 132.84 330 0.00 81.85 -10.00 285.28 -10.00 132.84 335 0.00 86.52 -10.00 285.28 -10.00 132.84 340 0.00 91.20 -10.00 285.28 -10.00 132.84 345 0.00 95.88 -10.00 285.28 -10.00 132.84 350 0.39 100.57 -10.00 261.81 -10.00 117.14 355 0.45 105.25 -10.00 255.37 -10.00 112.66 Frequency Coordination and Interference Analysis Report 10/31/2018 Page 10 of 11

5. CERTIFICATION I HEREBY CERTIFY THAT I AM THE TECHNICALLY QUALIFIED PERSON RESPONSIBLE FOR THE PREPARATION OF THE FREQUENCY COORDINATION DATA CONTAINED IN THIS APPLICATION, THAT I AM FAMILIAR WITH PARTS 101 AND 25 OF THE FCC RULES AND REGULATIONS, THAT I HAVE EITHER PREPARED OR REVIEWED THE FREQUENCY COORDINATION DATA SUBMITTED WITH THIS APPLICATION, AND THAT IT IS COMPLETE AND CORRECT TO THE BEST OF MY KNOWLEDGE AND BELIEF. BY: _ Gary K. Edwards Senior Manager COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 DATED: October 31, 2018 Frequency Coordination and Interference Analysis Report 10/31/2018 Page 11 of 11


Document Created: 2018-11-14 16:52:17
Document Modified: 2018-11-14 16:52:17
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