Attachment Coordination Letters

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

IBFS_SESMOD2018101703680_1558278

October 15, 2018 Re: AT&T Corp. HAMPTON, GA Call Sign: E090084 C-Band Transmit-Receive Earth Station Job Number: 181015COMSGE18 **** Expedited Response Requested by October 29, 2018 **** ****** Revision Notice ********** Dear Frequency Coordinator: This notice is being provided in accordance with Section 25.203(c) of the FCC Rules and Regulations. We are forwarding the attached revised coordination data on behalf of AT&T Corp - for modifications to their existing C-Band Transmit-Receive Earth Stations in HAMPTON, GA. AT&T plans to add a C-band transmit/receive earth station to their existing teleport. Please update your database with the attached information. This proposed antenna will be co-located with existing large diameter C-band transmit/receive earth stations operating under similar parameters. We respectfully request that you examine this data for its interference potential with your system(s). In the event that your analysis identifies potential interference cases that were not previously reported, please contact us by October 29, 2018, as our client would like to expedite the filing of this earth station with the FCC. If there are any questions concerning this coordination notice, please contact Comsearch. Sincerely, COMSEARCH Gary K. Edwards Senior Manager gedwards@comsearch.com Enclosure(s)

Page 1 of 3 COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5662 http://www.comsearch.com Date: 10/15/2018 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

Page 2 of 3 COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5662 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

Page 3 of 3 COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5662 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


Document Created: 2018-10-16 17:23:43
Document Modified: 2018-10-16 17:23:43
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