Attachment CHIGNIK FREQUENCY CO

This document pretains to SES-MOD-20150527-00312 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2015052700312_1089056

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for Alascom, Inc. Chignik Lagoon, Alaska Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 April 23, 2015

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 04/23/2015 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 04/23/2015 Page 3 of 10

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. The following companies reported potential great circle interference conflicts that did not meet the objectives on a line-of-sight basis. When over-the-horizon losses are considered on the interfering paths, sufficient blockage exists to negate harmful interference from occurring with the proposed transmit-receive earth station. Company None No carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 04/23/2015 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. Expedited coordination data for this earth station was emailed and sent to the below listed carriers with a letter dated April 13, 2015. Company Comsearch Frequency Coordination and Interference Analysis Report 04/23/2015 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 04/23/2015 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 04/23/2015 Job Number: 150413COMSJC01 Administrative Information Status ENGINEER PROPOSAL Call Sign Licensee Code P1040 Licensee Name Alascom, Inc. Site Information CHIGNIK LAGOON, ALASKA Venue Name Latitude (NAD 83) 56° 18' 35.0" N Longitude (NAD 83) 158° 32' 22.0" 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 143° West Longitude Azimuth Range 111.6° to 161.5° Corresponding Elevation Angles 5.1° / 24.4° Antenna Centerline (AGL) 4.57 m / 15.0 ft Antenna Information Receive Transmit Manufacturer Andrew Andrew Model 4.5 Meter 4.5 Meter Gain / Diameter 44.0 dBi / 4.5 m 46.7 dBi / 4.5 m 3-dB / 15-dB Beamwidth 1.22° / 2.47° 0.85° / 1.90° 28K4G7W to 6M67G7W Max Available RF Power (dBW/4 kHz) -2.7 -18.2 (dBW/MHz) 21.3 5.8 Maximum EIRP (dBW/4 kHz) 44.0 28.5 (dBW/MHz) 68.0 52.5 (dBW) 52.5 60.7 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) 28K4G7W - 6M67G7W / 3700.0 - 4200.0 28K4G7W - 6M67G7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 577.7 km / 358.9 mi 330.6 km / 205.4 mi Precipitation Scatter Contour Radius 617.1 km / 383.4 mi 101.6 km / 63.1 mi Frequency Coordination and Interference Analysis Report 04/23/2015 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 Alascom, Inc. Latitude (NAD 83) 56° 18' 35.0" N Longitude (NAD 83) 158° 32' 22.0" W Ground Elevation (AMSL) 4.57 m / 15.0 ft Antenna Centerline (AGL) 4.57 m / 15.0 ft Antenna Model Andrew 4.5 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 0.66 111.55 -10.00 296.83 -10.00 141.81 5 0.39 106.56 -10.00 351.76 -10.00 169.81 10 0.29 101.57 -10.00 380.03 -10.00 184.16 15 0.00 96.59 -10.00 412.20 -10.00 200.77 20 0.00 91.61 -10.00 412.20 -10.00 200.77 25 0.00 86.63 -10.00 412.20 -10.00 200.77 30 0.00 81.65 -10.00 412.20 -10.00 200.77 35 0.00 76.67 -10.00 412.20 -10.00 200.77 40 0.00 71.69 -10.00 412.20 -10.00 200.77 45 0.00 66.71 -10.00 412.20 -10.00 200.77 50 2.09 61.66 -10.00 196.07 -10.00 100.00 55 3.81 56.62 -10.00 144.65 -10.00 100.00 60 4.47 51.62 -10.00 136.03 -10.00 100.00 65 4.81 46.62 -9.71 134.19 -9.71 100.00 70 4.84 41.62 -8.48 138.75 -8.48 100.00 75 5.55 36.62 -7.09 136.15 -7.09 100.00 80 7.42 31.69 -5.52 132.88 -5.52 100.00 85 9.79 26.99 -3.78 132.82 -3.78 100.00 90 10.85 22.32 -1.72 135.38 -1.72 100.00 95 10.59 17.46 0.95 147.77 0.95 100.00 100 10.67 12.85 4.28 162.06 4.28 100.00 105 12.79 10.11 6.88 159.12 6.88 100.00 110 12.75 7.40 10.27 577.71 10.27 330.65 115 11.40 3.75 17.65 448.14 17.65 240.32 120 10.94 0.98 32.23 401.96 32.23 201.41 125 12.64 0.36 42.95 435.04 42.95 221.62 130 11.96 2.60 21.64 255.60 21.64 120.91 135 10.11 6.30 12.02 210.05 12.02 102.70 140 9.40 8.84 8.33 191.68 8.33 100.00 145 12.14 7.95 9.49 177.34 9.49 100.00 150 13.16 8.47 8.81 165.87 8.81 100.00 155 15.51 7.45 10.19 155.43 10.19 100.00 160 17.20 6.84 11.12 148.46 11.12 100.00 165 15.61 9.44 7.63 143.92 7.63 100.00 170 14.43 13.05 4.11 136.92 4.11 100.00 175 13.99 16.96 1.26 128.95 1.26 100.00 180 13.24 21.48 -1.30 124.14 -1.30 100.00 185 11.66 26.53 -3.59 124.13 -3.59 100.00 Frequency Coordination and Interference Analysis Report 04/23/2015 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 Alascom, Inc. Latitude (NAD 83) 56° 18' 35.0" N Longitude (NAD 83) 158° 32' 22.0" W Ground Elevation (AMSL) 4.57 m / 15.0 ft Antenna Centerline (AGL) 4.57 m / 15.0 ft Antenna Model Andrew 4.5 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 9.24 31.96 -5.61 127.60 -5.61 100.00 195 7.35 37.11 -7.24 126.85 -7.24 100.00 200 4.91 42.43 -8.69 137.23 -8.69 100.00 205 2.32 47.74 -9.97 187.80 -9.97 100.00 210 0.39 52.73 -10.00 351.21 -10.00 169.53 215 0.00 57.18 -10.00 412.20 -10.00 200.77 220 2.11 61.06 -10.00 195.23 -10.00 100.00 225 2.80 65.47 -10.00 171.07 -10.00 100.00 230 1.95 70.18 -10.00 202.08 -10.00 100.50 235 0.63 74.91 -10.00 302.16 -10.00 144.39 240 0.00 79.52 -10.00 412.20 -10.00 200.77 245 0.28 84.05 -10.00 386.22 -10.00 187.29 250 1.05 88.60 -10.00 251.06 -10.00 119.91 255 1.47 93.20 -10.00 226.77 -10.00 111.64 260 2.09 97.84 -10.00 195.95 -10.00 100.00 265 3.16 102.55 -10.00 160.28 -10.00 100.00 270 2.99 107.16 -10.00 164.84 -10.00 100.00 275 3.96 111.92 -10.00 141.33 -10.00 100.00 280 2.80 116.32 -10.00 171.04 -10.00 100.00 285 1.98 120.66 -10.00 200.61 -10.00 100.00 290 4.20 125.73 -10.00 138.47 -10.00 100.00 295 5.31 130.56 -10.00 128.03 -10.00 100.00 300 4.09 134.60 -10.00 139.56 -10.00 100.00 305 3.25 138.55 -10.00 157.92 -10.00 100.00 310 2.57 142.32 -10.00 178.57 -10.00 100.00 315 2.67 146.22 -10.00 175.40 -10.00 100.00 320 2.41 149.61 -10.00 184.46 -10.00 100.00 325 2.48 146.52 -10.00 181.92 -10.00 100.00 330 2.29 141.53 -10.00 188.71 -10.00 100.00 335 2.17 136.53 -10.00 192.91 -10.00 100.00 340 1.97 131.54 -10.00 201.21 -10.00 100.08 345 1.72 126.54 -10.00 213.42 -10.00 105.77 350 1.37 121.54 -10.00 232.63 -10.00 114.12 355 0.92 116.54 -10.00 262.03 -10.00 125.45 Frequency Coordination and Interference Analysis Report 04/23/2015 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. Jeffrey E. Cowles Engineer III, Telecommunications COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Va 20147 DATED: April 23, 2015 Frequency Coordination and Interference Analysis Report 04/23/2015 Page 10 of 10


Document Created: 2015-04-24 10:28:06
Document Modified: 2015-04-24 10:28:06
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