Supplemental Letter

SUPPLEMENT submitted by AT&T Corp.

Supplemental Letter

2018-11-14

This document pretains to SES-MOD-20181017-03682 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2018101703682_1572999

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 KB32 to Add New Antennas, IBFS File No. SES‐MOD‐INTR2018‐09339 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 are the final Frequency Coordination and Interference Analysis Reports 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 1 Coordination Report for 11.1-meter Antenna

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for AT&T Corp – MALIBU, CA 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 ABC Holding Company Inc. AT&T Mobility Spectrum LLC - Southern CA Air Sites 2000 LLC Anaheim City, of BNS Electronics, Inc. California Internet Solutions, Inc. California Internet, L.P. California State University, Northridge California, State of City of Los Angeles Dept Water & Power City of Montebello Coast Community College District Communication Services, Inc. DM Ventures, Inc. dba Warp2Biz Fresno MSA Limited Partnership Frontier California Inc. Glendale City California Go Creative Wireless ION Media Los Angeles License, Inc. KTLA, LLC Kern, County of LDM Engineering Los Angeles City Info Technology Agency Los Angeles County Dept of Public Works Los Angeles County FCC Licensing Section Los Angeles County Metro Transit Auth Los Angeles Regional Interoperable Comm Los Angeles SMSA Ltd. Partnership Los Angeles Unified School District MHO Networks Metropolitan Water Dist of So California New Cingular Wireless PCS - Los Angeles Nextel of California Inc. Nextweb Inc Northrop Grumman Systems Corp. Nrj TV La License Co, LLC Olympic Wireless, LLC Orange, County of, CA Pacific Bell Tel Com dba AT&T California Regents of the University of California San Bernardino County of California Frequency Coordination and Interference Analysis Report 10/31/2018 Page 5 of 11

Santa Barbara, County of Skyriver Communications Southern California Edison Company Southern California Gas Company Southern California Regional Rail Auth. Spectrum Link, Inc. TV Microwaves Company Turn Wireless, LLC Union Pacific Railroad Company Vectus, Inc Ventura, County of Verizon Wireless (VAW) LLC (Southern CA) Verizon Wireless (VAW) LLC-N CA/NV Wiline Spectrum Holdings LLC 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: 181015COMSGE14 Administrative Information Status ENGINEER PROPOSAL Call Sign KB32 Licensee Code P1175P Licensee Name AT&T Corp - Site Information MALIBU, CA Venue Name Latitude (NAD 83) 34° 4' 51.0" N Longitude (NAD 83) 118° 53' 47.3" W Climate Zone A Rain Zone 4 Ground Elevation (AMSL) 335.28 m / 1100.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 52° W to 187° West Longitude Azimuth Range 103.4° to 257.3° Corresponding Elevation Angles 10.4° / 9.4° 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 51.9 dBi / 11.1 m 55.6 dBi / 11.1 m 3-dB / 15-dB Beamwidth 0.40° / 0.90° 0.30° / 0.60° Max Available RF Power (dBW/4 kHz) -2.7 (dBW/MHz) 21.3 Maximum EIRP (dBW/4 kHz) 52.9 (dBW/MHz) 76.9 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) 54K6G7W - 72M0G7W / 3625.0 - 4200.0 54K6G7W - 72M0G7W / 5850.0 - 6425.0 Max Great Circle Coordination Distance 298.1 km / 185.2 mi 146.0 km / 90.7 mi Precipitation Scatter Contour Radius 392.6 km / 243.9 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 MALIBU, CA Licensee Name AT&T Corp - Latitude (NAD 83) 34° 4' 51.0" N Longitude (NAD 83) 118° 53' 47.3" W Ground Elevation (AMSL) 335.28 m / 1100.0 ft Antenna Centerline (AGL) 5.49 m / 18.0 ft Antenna Model Gen Dynamics 11.1 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 -2.7 (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 5.78 102.67 -10.00 127.35 -10.00 100.00 5 6.51 98.43 -10.00 119.65 -10.00 100.00 10 7.61 93.44 -10.00 107.84 -10.00 100.00 15 7.33 88.45 -10.00 110.87 -10.00 100.00 20 8.10 83.45 -10.00 102.95 -10.00 100.00 25 7.62 78.46 -10.00 107.76 -10.00 100.00 30 7.15 73.47 -10.00 112.73 -10.00 100.00 35 7.24 68.48 -10.00 111.82 -10.00 100.00 40 7.30 63.49 -10.00 111.19 -10.00 100.00 45 6.61 58.52 -10.00 118.50 -10.00 100.00 50 5.73 53.59 -10.00 127.77 -10.00 100.00 55 6.68 48.55 -10.00 117.78 -10.00 100.00 60 4.49 43.77 -9.03 144.76 -9.03 100.00 65 5.75 38.68 -7.69 135.56 -7.69 100.00 70 6.51 33.65 -6.17 135.01 -6.17 100.00 75 6.49 28.69 -4.44 141.52 -4.44 100.00 80 6.15 23.81 -2.42 155.77 -2.42 100.00 85 5.69 19.02 0.02 177.39 0.02 100.00 90 6.58 13.97 3.37 185.42 3.37 100.00 95 6.52 9.29 7.80 209.84 7.80 100.00 100 5.80 5.75 13.00 255.86 13.00 117.20 105 6.63 4.09 16.71 272.48 16.71 123.24 110 7.08 7.24 10.51 219.32 10.51 100.00 115 8.40 10.34 6.63 182.54 6.63 100.00 120 8.91 13.85 3.47 155.14 3.47 100.00 125 7.75 18.34 0.41 150.45 0.41 100.00 130 8.90 21.19 -1.16 132.72 -1.16 100.00 135 8.66 24.81 -2.87 127.35 -2.87 100.00 140 8.66 28.08 -4.21 121.61 -4.21 100.00 145 9.74 30.27 -5.02 108.93 -5.02 100.00 150 10.15 32.62 -5.84 102.27 -5.84 100.00 155 11.37 33.88 -6.25 100.00 -6.25 100.00 160 13.86 33.44 -6.11 100.00 -6.11 100.00 165 15.13 33.58 -6.15 100.00 -6.15 100.00 170 16.33 33.34 -6.07 100.00 -6.07 100.00 175 13.91 36.29 -6.99 100.00 -6.99 100.00 180 11.66 38.73 -7.70 100.00 -7.70 100.00 185 11.05 39.13 -7.81 100.00 -7.81 100.00 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 MALIBU, CA Licensee Name AT&T Corp - Latitude (NAD 83) 34° 4' 51.0" N Longitude (NAD 83) 118° 53' 47.3" W Ground Elevation (AMSL) 335.28 m / 1100.0 ft Antenna Centerline (AGL) 5.49 m / 18.0 ft Antenna Model Gen Dynamics 11.1 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 -2.7 (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 13.29 36.34 -7.01 100.00 -7.01 100.00 195 12.00 36.59 -7.08 100.00 -7.08 100.00 200 9.60 37.36 -7.31 100.68 -7.31 100.00 205 9.43 35.56 -6.77 104.29 -6.77 100.00 210 10.12 32.65 -5.85 102.48 -5.85 100.00 215 9.66 30.32 -5.04 109.45 -5.04 100.00 220 9.43 27.51 -3.99 115.94 -3.99 100.00 225 10.23 23.70 -2.37 116.45 -2.37 100.00 230 7.59 22.08 -1.60 141.95 -1.60 100.00 235 8.05 18.14 0.53 147.51 0.53 100.00 240 8.13 14.35 3.08 161.27 3.08 100.00 245 5.86 11.91 5.10 204.56 5.10 100.00 250 4.84 8.58 8.66 238.28 8.66 109.93 255 4.33 5.58 13.34 284.63 13.34 133.95 260 3.14 6.83 11.14 298.13 11.14 145.62 265 2.15 10.56 6.40 288.23 6.40 145.99 270 2.68 14.34 3.08 247.79 3.08 124.13 275 2.52 18.95 0.06 231.78 0.06 115.60 280 2.71 23.61 -2.33 213.60 -2.33 103.31 285 2.93 28.38 -4.33 201.29 -4.33 100.00 290 3.30 33.20 -6.03 185.04 -6.03 100.00 295 2.75 38.19 -7.55 189.39 -7.55 100.00 300 4.48 42.92 -8.82 145.92 -8.82 100.00 305 4.80 47.86 -10.00 136.24 -10.00 100.00 310 5.16 52.82 -10.00 133.33 -10.00 100.00 315 5.49 57.78 -10.00 130.07 -10.00 100.00 320 6.64 62.73 -10.00 118.17 -10.00 100.00 325 7.28 67.71 -10.00 111.39 -10.00 100.00 330 7.11 72.71 -10.00 113.11 -10.00 100.00 335 6.12 77.72 -10.00 123.92 -10.00 100.00 340 6.53 82.70 -10.00 119.45 -10.00 100.00 345 7.27 87.70 -10.00 111.50 -10.00 100.00 350 7.54 92.69 -10.00 108.58 -10.00 100.00 355 6.60 97.69 -10.00 118.64 -10.00 100.00 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

Attachment 2 Coordination Report for 13.1-meter Antenna

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for AT&T Corp – MALIBU, CA 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 ABC Holding Company Inc. AT&T Mobility Spectrum LLC - Southern CA Air Sites 2000 LLC Anaheim City, of BNS Electronics, Inc. California Internet Solutions, Inc. California Internet, L.P. California State University, Northridge California, State of City of Los Angeles Dept Water & Power City of Montebello Coast Community College District Communication Services, Inc. DM Ventures, Inc. dba Warp2Biz Fresno MSA Limited Partnership Frontier California Inc. Glendale City California Go Creative Wireless ION Media Los Angeles License, Inc. KTLA, LLC Kern, County of LDM Engineering Los Angeles City Info Technology Agency Los Angeles County Dept of Public Works Los Angeles County FCC Licensing Section Los Angeles County Metro Transit Auth Los Angeles Regional Interoperable Comm Los Angeles SMSA Ltd. Partnership Los Angeles Unified School District MHO Networks Metropolitan Water Dist of So California New Cingular Wireless PCS - Los Angeles Nextel of California Inc. Nextweb Inc Northrop Grumman Systems Corp. Nrj TV La License Co, LLC Olympic Wireless, LLC Orange, County of, CA Pacific Bell Tel Com dba AT&T California Regents of the University of California San Bernardino County of California Frequency Coordination and Interference Analysis Report 10/31/2018 Page 5 of 11

Santa Barbara, County of Skyriver Communications Southern California Edison Company Southern California Gas Company Southern California Regional Rail Auth. Spectrum Link, Inc. TV Microwaves Company Turn Wireless, LLC Union Pacific Railroad Company Vectus, Inc Ventura, County of Verizon Wireless (VAW) LLC (Southern CA) Verizon Wireless (VAW) LLC-N CA/NV Wiline Spectrum Holdings LLC 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: 181015COMSGE15 Administrative Information Status ENGINEER PROPOSAL Call Sign KB32 Licensee Code P1175P Licensee Name AT&T Corp - Extended C-Band Sites Site Information MALIBU, CA Venue Name Latitude (NAD 83) 34° 4' 51.0" N Longitude (NAD 83) 118° 53' 47.3" W Climate Zone A Rain Zone 4 Ground Elevation (AMSL) 335.28 m / 1100.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 52° W to 187° West Longitude Azimuth Range 103.4° to 257.3° Corresponding Elevation Angles 10.4° / 9.4° 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) -2.7 (dBW/MHz) 21.3 Maximum EIRP (dBW/4 kHz) 54.6 (dBW/MHz) 78.6 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) 54K6G7W - 72M0G7W / 3700.0 - 4200.0 54K6G7W - 72M0G7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 298.1 km / 185.2 mi 146.0 km / 90.7 mi Precipitation Scatter Contour Radius 392.6 km / 243.9 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 MALIBU, CA Licensee Name AT&T Corp - Latitude (NAD 83) 34° 4' 51.0" N Longitude (NAD 83) 118° 53' 47.3" W Ground Elevation (AMSL) 335.28 m / 1100.0 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 -2.7 (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 5.78 102.67 -10.00 127.35 -10.00 100.00 5 6.51 98.43 -10.00 119.65 -10.00 100.00 10 7.61 93.44 -10.00 107.84 -10.00 100.00 15 7.33 88.45 -10.00 110.87 -10.00 100.00 20 8.10 83.45 -10.00 102.95 -10.00 100.00 25 7.62 78.46 -10.00 107.76 -10.00 100.00 30 7.15 73.47 -10.00 112.73 -10.00 100.00 35 7.24 68.48 -10.00 111.82 -10.00 100.00 40 7.30 63.49 -10.00 111.19 -10.00 100.00 45 6.61 58.52 -10.00 118.50 -10.00 100.00 50 5.73 53.59 -10.00 127.77 -10.00 100.00 55 6.68 48.55 -10.00 117.78 -10.00 100.00 60 4.49 43.77 -9.03 144.76 -9.03 100.00 65 5.75 38.68 -7.69 135.56 -7.69 100.00 70 6.51 33.65 -6.17 135.01 -6.17 100.00 75 6.49 28.69 -4.44 141.52 -4.44 100.00 80 6.15 23.81 -2.42 155.77 -2.42 100.00 85 5.69 19.02 0.02 177.39 0.02 100.00 90 6.58 13.97 3.37 185.42 3.37 100.00 95 6.52 9.29 7.80 209.84 7.80 100.00 100 5.80 5.75 13.00 255.86 13.00 117.20 105 6.63 4.09 16.71 272.48 16.71 123.24 110 7.08 7.24 10.51 219.32 10.51 100.00 115 8.40 10.34 6.63 182.54 6.63 100.00 120 8.91 13.85 3.47 155.14 3.47 100.00 125 7.75 18.34 0.41 150.45 0.41 100.00 130 8.90 21.19 -1.16 132.72 -1.16 100.00 135 8.66 24.81 -2.87 127.35 -2.87 100.00 140 8.66 28.08 -4.21 121.61 -4.21 100.00 145 9.74 30.27 -5.02 108.93 -5.02 100.00 150 10.15 32.62 -5.84 102.27 -5.84 100.00 155 11.37 33.88 -6.25 100.00 -6.25 100.00 160 13.86 33.44 -6.11 100.00 -6.11 100.00 165 15.13 33.58 -6.15 100.00 -6.15 100.00 170 16.33 33.34 -6.07 100.00 -6.07 100.00 175 13.91 36.29 -6.99 100.00 -6.99 100.00 180 11.66 38.73 -7.70 100.00 -7.70 100.00 185 11.05 39.13 -7.81 100.00 -7.81 100.00 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 MALIBU, CA Licensee Name AT&T Corp - Latitude (NAD 83) 34° 4' 51.0" N Longitude (NAD 83) 118° 53' 47.3" W Ground Elevation (AMSL) 335.28 m / 1100.0 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 -2.7 (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 13.29 36.34 -7.01 100.00 -7.01 100.00 195 12.00 36.59 -7.08 100.00 -7.08 100.00 200 9.60 37.36 -7.31 100.68 -7.31 100.00 205 9.43 35.56 -6.77 104.29 -6.77 100.00 210 10.12 32.65 -5.85 102.48 -5.85 100.00 215 9.66 30.32 -5.04 109.45 -5.04 100.00 220 9.43 27.51 -3.99 115.94 -3.99 100.00 225 10.23 23.70 -2.37 116.45 -2.37 100.00 230 7.59 22.08 -1.60 141.95 -1.60 100.00 235 8.05 18.14 0.53 147.51 0.53 100.00 240 8.13 14.35 3.08 161.27 3.08 100.00 245 5.86 11.91 5.10 204.56 5.10 100.00 250 4.84 8.58 8.66 238.28 8.66 109.93 255 4.33 5.58 13.34 284.63 13.34 133.95 260 3.14 6.83 11.14 298.13 11.14 145.62 265 2.15 10.56 6.40 288.23 6.40 145.99 270 2.68 14.34 3.08 247.79 3.08 124.13 275 2.52 18.95 0.06 231.78 0.06 115.60 280 2.71 23.61 -2.33 213.60 -2.33 103.31 285 2.93 28.38 -4.33 201.29 -4.33 100.00 290 3.30 33.20 -6.03 185.04 -6.03 100.00 295 2.75 38.19 -7.55 189.39 -7.55 100.00 300 4.48 42.92 -8.82 145.92 -8.82 100.00 305 4.80 47.86 -10.00 136.24 -10.00 100.00 310 5.16 52.82 -10.00 133.33 -10.00 100.00 315 5.49 57.78 -10.00 130.07 -10.00 100.00 320 6.64 62.73 -10.00 118.17 -10.00 100.00 325 7.28 67.71 -10.00 111.39 -10.00 100.00 330 7.11 72.71 -10.00 113.11 -10.00 100.00 335 6.12 77.72 -10.00 123.92 -10.00 100.00 340 6.53 82.70 -10.00 119.45 -10.00 100.00 345 7.27 87.70 -10.00 111.50 -10.00 100.00 350 7.54 92.69 -10.00 108.58 -10.00 100.00 355 6.60 97.69 -10.00 118.64 -10.00 100.00 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


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Document Modified: 2018-11-14 17:27:34
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