Attachment Exhibit A

This document pretains to SES-MOD-20181030-03758 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2018103003758_1563953

Exhibit A Frequency Coordination Per 47 C.F.R. Ch. 1 §25.130(b), attached is a “Frequency Coordination and Interference Analysis Report” performed pursuant to 47 C.F.R. Ch. 1 §25.203.

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for GCI Communications Corp. CHIGNIK LAGOON, AK Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 October 25, 2018

TABLE OF CONTENTS 1. CONCLUSIONS ............................................................................................................................................ 3 2. SUMMARY OF RESULTS ............................................................................................................................ 4 3. SUPPLEMENTAL SHOWING ....................................................................................................................... 5 4. EARTH STATION COORDINATION DATA .................................................................................................. 6 5. CERTIFICATION ......................................................................................................................................... 10 Frequency Coordination and Interference Analysis Report 10/25/2018 Page 2 of 10

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 10/25/2018 Page 3 of 10

2. SUMMARY OF RESULTS There were no great circle interference cases identified during the interference study of the proposed earth station. No carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 10/25/2018 Page 4 of 10

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 on 10/09/2018. Frequency Coordination and Interference Analysis Report 10/25/2018 Page 5 of 10

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 10/25/2018 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 10/25/2018 Job Number: 181009COMSTC18 Administrative Information Call Sign E960431 Licensee Code P3203 Licensee Name GCI Communications Corp. Site Information CHIGNIK LAGOON, AK Latitude (NAD 83) 56° 18' 36.2" N Longitude (NAD 83) 158° 32' 20.6" W Climate Zone B Rain Zone 2 Ground Elevation (AMSL) 4.57 m / 15.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 94° W to 223° West Longitude Azimuth Range 111.6° to 248.3° Corresponding Elevation Angles 5.1° / 5.2° Antenna Centerline (AGL) 3.08 m / 10.1 ft Antenna Information Receive Transmit Manufacturer ViaSat/Scientific-Atlanta ViaSat/Scientific-Atlanta Model 8345 8345 Gain / Diameter 43.5 dBi / 4.5 m 46.8 dBi / 4.5 m 3-dB / 15-dB Beamwidth 1.10° / 2.20° 0.80° / 1.60° 45K0G7W - 108MG7W 45K0D7W - 108MD7W Max Available RF Power (dBW/4 kHz) -2.7 -18.29 (dBW/MHz) 21.3 5.71 Maximum EIRP (dBW/4 kHz) 44.1 28.51 (dBW/MHz) 54.61 52.51 (dBW) 54.61 72.82 Interference Objectives: Long Term -144.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -134.0 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) 45K0G7W - 108MG7W / 3700.0 - 4200.0 45K0G7W - 108MG7W / 5925.0 - 6425.0 45K0D7W - 108MD7W / 3700.0 - 4200.0 45K0D7W - 108MD7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 501.9 km / 311.8 mi 333.1 km / 207.0 mi Precipitation Scatter Contour Radius 567.8 km / 352.8 mi 101.6 km / 63.1 mi Frequency Coordination and Interference Analysis Report 10/25/2018 Page 7 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values CHIGNIK LAGOON, AK Licensee Name GCI Communications Corp. Latitude (NAD 83) 56° 18' 36.2" N Longitude (NAD 83) 158° 32' 20.6" W Ground Elevation (AMSL) 4.57 m / 15.0 ft Antenna Centerline (AGL) 3.08 m / 10.1 ft Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -144.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -134.0 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 0.66 111.55 -10.00 210.26 -10.00 141.71 5 0.40 106.56 -10.00 248.72 -10.00 168.17 10 0.32 101.57 -10.00 264.24 -10.00 180.58 15 0.00 96.59 -10.00 291.54 -10.00 200.77 20 0.00 91.61 -10.00 291.54 -10.00 200.77 25 0.00 86.63 -10.00 291.54 -10.00 200.77 30 0.00 81.65 -10.00 291.54 -10.00 200.77 35 0.00 76.67 -10.00 291.54 -10.00 200.77 40 0.00 71.69 -10.00 291.54 -10.00 200.77 45 0.29 66.70 -10.00 270.30 -10.00 185.01 50 2.12 61.66 -10.00 136.44 -10.00 100.00 55 3.51 56.63 -10.00 110.80 -10.00 100.00 60 4.52 51.62 -10.00 100.00 -10.00 100.00 65 4.87 46.62 -9.71 100.00 -9.71 100.00 70 5.03 41.61 -8.48 100.17 -8.48 100.00 75 5.59 36.62 -7.09 100.00 -7.09 100.00 80 6.73 31.65 -5.51 100.00 -5.51 100.00 85 9.66 26.97 -3.77 100.00 -3.77 100.00 90 10.75 22.30 -1.71 100.00 -1.71 100.00 95 10.57 17.46 0.95 108.11 0.95 100.00 100 11.12 13.05 4.11 115.06 4.11 100.00 105 11.81 9.39 7.68 121.02 7.68 100.00 110 13.14 7.74 9.79 418.66 9.79 323.55 115 11.76 4.06 16.80 312.88 16.80 234.52 120 10.87 0.93 32.80 286.89 32.80 201.94 125 12.04 0.60 37.58 282.77 37.58 193.04 130 12.76 1.85 25.35 193.40 25.35 129.58 135 10.62 5.84 12.83 147.09 12.83 102.88 140 8.93 9.27 7.82 133.72 7.82 100.00 145 10.07 9.91 7.10 127.73 7.10 100.00 150 13.08 8.54 8.71 118.45 8.71 100.00 155 13.70 9.21 7.89 114.97 7.89 100.00 160 16.34 7.68 9.86 109.42 9.86 100.00 165 15.52 9.29 7.80 106.74 7.80 100.00 170 15.02 10.38 6.59 105.28 6.59 100.00 175 13.60 12.15 4.88 106.39 4.88 100.00 180 13.72 12.16 4.87 105.83 4.87 100.00 185 11.78 13.97 3.37 109.90 3.37 100.00 Frequency Coordination and Interference Analysis Report 10/25/2018 Page 8 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values CHIGNIK LAGOON, AK Licensee Name GCI Communications Corp. Latitude (NAD 83) 56° 18' 36.2" N Longitude (NAD 83) 158° 32' 20.6" W Ground Elevation (AMSL) 4.57 m / 15.0 ft Antenna Centerline (AGL) 3.08 m / 10.1 ft Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -144.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -134.0 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 9.43 15.94 1.94 114.84 1.94 100.00 195 7.23 17.49 0.93 116.77 0.93 100.00 200 5.16 18.63 0.25 123.66 0.25 100.00 205 2.98 19.58 -0.30 154.08 -0.30 107.97 210 0.51 20.53 -0.81 295.14 -0.81 200.79 215 0.00 19.36 -0.17 386.22 -0.17 261.49 220 1.96 15.72 2.09 201.95 2.09 134.30 225 2.75 13.02 4.14 184.44 4.14 123.49 230 1.88 11.67 5.32 227.34 5.32 150.41 235 0.53 10.58 6.38 360.29 6.38 244.50 240 0.00 8.65 8.57 501.88 8.57 333.14 245 0.45 5.77 12.98 464.09 12.98 307.12 250 1.04 4.46 15.76 422.43 15.76 325.32 255 1.50 7.62 9.95 283.14 9.95 189.77 260 2.17 12.06 4.97 211.18 4.97 139.96 265 3.21 16.80 1.37 156.00 1.37 109.05 270 3.06 21.78 -1.45 147.29 -1.45 103.49 275 3.99 26.71 -3.67 120.14 -3.67 100.00 280 2.71 31.77 -5.55 139.12 -5.55 100.00 285 2.22 36.79 -7.14 145.54 -7.14 102.95 290 4.23 41.69 -8.50 105.75 -8.50 100.00 295 5.26 46.68 -9.73 100.00 -9.73 100.00 300 4.07 51.69 -10.00 102.39 -10.00 100.00 305 3.21 56.71 -10.00 115.66 -10.00 100.00 310 2.54 61.72 -10.00 126.72 -10.00 100.00 315 2.68 66.71 -10.00 123.72 -10.00 100.00 320 2.40 71.71 -10.00 129.75 -10.00 100.00 325 2.68 76.70 -10.00 123.61 -10.00 100.00 330 2.45 81.69 -10.00 128.75 -10.00 100.00 335 2.24 86.69 -10.00 133.66 -10.00 100.00 340 1.98 91.68 -10.00 140.26 -10.00 100.00 345 1.73 96.67 -10.00 148.56 -10.00 105.50 350 1.35 101.66 -10.00 162.56 -10.00 114.38 355 0.91 106.64 -10.00 185.82 -10.00 126.10 Frequency Coordination and Interference Analysis Report 10/25/2018 Page 9 of 10

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. Timothy O. Crutcher Frequency Planner COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 DATED: October 25, 2018 Frequency Coordination and Interference Analysis Report 10/25/2018 Page 10 of 10


Document Created: 2018-10-25 14:31:44
Document Modified: 2018-10-25 14:31:44
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