Attachment Exhibit C

This document pretains to SES-MOD-20170630-00727 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017063000727_1243221

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for Telesat Network Services, Inc. MT JACKSON, VA (KA399) Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 December 30, 2016

TABLE OF CONTENTS 1. CONCLUSIONS ............................................................................................................................................ 3 2. SUMMARY OF RESULTS ............................................................................................................................ 4 3. SUPPLEMENTAL SHOWING ....................................................................................................................... 5 4. EARTH STATION COORDINATION DATA .................................................................................................. 8 5. CERTIFICATION ......................................................................................................................................... 12 Frequency Coordination and Interference Analysis Report 12/30/2016 Page 2 of 12

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 12/30/2016 Page 3 of 12

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 Shenandoah Personal Communications, LLC No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 12/30/2016 Page 4 of 12

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 12/30/2016. Company ALLEGANY COLLEGE OF MARYLAND ALLEGANY COUNTY GOVERNMENT AT&T Communications of Virginia, LLC AT&T Corp. AT&T Wireless Services 3 LLC - NM, N TX Access MLP Operating LLC Adams County Department of Emergency Svc Affiniti PA, LLC Albermarle, County of, Virginia Argos Engineering, LLC Atlantic Broadband (Penn), LLC B2x Online Inc BLAIR COUNTY 911 Baltimore Gas and Electric Company Bedford, County of Berkeley, County of Blaze Broadband Blue Ridge Carriers Buggs Island Telephone Cooperative, Inc. CNG Transmission Corporation Cambria, County of Caroline County, VA Cellco Partnership - Bridgeville, PA/WV Cellco Partnership - Southern Virginia Cellco Partnership- PA Region Central Virginia Electric Cooperative Chesterfield, County of Citynet Clearwire Spectrum Holdings II, LLC Clearwire Spectrum Holdings III, LLC Clearwire Spectrum Holdings LLC Commonwealth of Pennsylvania-Radio Proj. Comprehensive Wireless LLC Conterra Ultra Broadband, LLC County of Dinwiddie, Virginia County of Franklin, VA County of Westmoreland County of York Cumberland, County of ECW Wireless, LLC Frequency Coordination and Interference Analysis Report 12/30/2016 Page 5 of 12

Eduro Networks LLC Enoch Pratt Free Library FELHC, INC FiberTower Network Services Corp.-DIP Franklin County Dept. of Emergency Servi Frederick County Fundamental Broadcasting LLC GEORGE MASON UNIVERSITY INSTR FNDTION Global Telecom & Technology Americas Goochland, County of Grant, County of Gray Television Licensee LLC (Gray TV) Gray Television Licensee, LLC Hardy Cellular Telephone Company Hardy Telecommunications Harrisonburg-Rockingham ECC Hilltower Tower Leasing, Inc Huntingdon, County of Juniata County Emergency Services King George County Loudoun County Public Schools Loudoun, County of MIT LINCOLN LABORATORY MLS Engineering Maryland Public Broadcasting Commission Maryland, State of - DNR Micrologic, Inc Middle East Broadcasting Networks, Inc. Mifflin County Montgomery, County of Morgan, County of NOROC Broadband LLC National Radio Astronomy Observatory Nelson, County of Netrepid, Inc. New Cingular Wireless PCS - Maryland New Cingular Wireless PCS LLC - DC New Cingular Wireless PCS LLC - Georgia New Cingular Wireless PCS LLC - VA New Cingular Wireless PCS LLC - WV,NC,SC New Cingular Wireless PCS, LLC - PA Nextlink Wireless, LLC Northern Virginia Electric Cooperative Old Dominion LLC PEG Bandwidth, LLC Page County Broadband Authority Pennsylvania Sports Entertainment Netwo. Pennsylvania Turnpike Commission Prince William, County of Public Broadcasting Service R. Fritz Enterprises Inc RAPPAHANNOCK ELECTRIC COOPERATIVE RCTC Wholesale Corporation RapidDSL & Wireless, Inc. Roanoke County of Rockbridge Reg. Pub Safety Comm Ctr Frequency Coordination and Interference Analysis Report 12/30/2016 Page 6 of 12

Rural Broadband Network Services LLC Shenandoah Personal Communications, LLC Somerset, County of South Central Task Force (SCTFNET) Southern Maryland Electric Cooperative I Southside Electric Cooperative Spotsylvania, County of Sprint Spectrum L.P. Sprintcom, Inc St. Mary's County of (MD) Stafford, County of State of Maryland, MIEMSS T-Mobile License LLC TWO WAY RADIO INC. Telecom Transport Management, Inc Telegia Communications Inc. Thought Transmissions, LLC USCOC of Cumberland, Inc. USCOC of Virginia RSA #2, Inc. USCOC of Virginia RSA #3, Inc. Valley Rural Electric Cooperative, Inc. Verizon Virginia, Inc. Verizon Wireless (VAW) LLC - Maryland Verizon Wireless (VAW) LLC - W/B/V Mkts Verizon Wireless (VAW) LLC-Pennsylvania Verizon Wireless VAW LLC - West Virginia Verizon Wireless VAW LLC-Southern VA Virginia Broadband, LLC Virginia Department of State Police Virginia Electric & Power Company Virginia Everywhere, LLC Virginia PCS Alliance, L.C. Virginia Region 2000 Local Govt Council Virginia Tech Foundation , Inc. WEST VIRGINIA RADIO CORPORATION WGAL Hearst Television, Inc WV DHHR BPH, Office of EMS, Com. Div. Warrenton Fauquier Joint Communications Washington County Board of Education Washington County Public Schools Washington Gas Light Company Washington Suburban Sanitary Commission West Virginia PCS Alliance, L.C. Williamson Enterprise LLC Winchester, City of World Class Wireless, LLC XO Communications, LLC Frequency Coordination and Interference Analysis Report 12/30/2016 Page 7 of 12

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 12/30/2016 Page 8 of 12

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 12/30/2016 Job Number: 160615COMSGE01 Administrative Information Status ENGINEER PROPOSAL Call Sign KA399 Licensee Code TELNET Licensee Name Telesat Network Services, Inc. Site Information MT JACKSON, VA Venue Name Latitude (NAD 83) 38° 43' 42.0" N Longitude (NAD 83) 78° 39' 25.0" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 283.22 m / 929.2 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Analog and Digital Satellite Arc 15° W to 110° West Longitude Azimuth Range 107.2° to 224.2° Corresponding Elevation Angles 11.7° / 34.6° Antenna Centerline (AGL) 8.0 m / 26.2 ft Antenna Information Receive - FCC32 Transmit - FCC32 Manufacturer Vertex Vertex Model 15 KPK 15 KPK Gain / Diameter 62.9 dBi / 15.0 m 64.5 dBi / 15.0 m 3-dB / 15-dB Beamwidth 0.80° / 1.40° 0.80° / 1.40° Max Available RF Power (dBW/4 kHz) -14.0 (dBW/MHz) 10.0 Maximum EIRP (dBW/4 kHz) 50.5 (dBW/MHz) 74.5 Interference Objectives: Long Term -156.0 dBW/MHz 20% -151.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -128.0 dBW/4 kHz 0.0025% Frequency Information Receive 11.0 GHz Transmit 14.0 GHz Emission / Frequency Range (MHz) 200KG7W - 54M0G7W / 10950.0 - 11200.0 600KG7W - 54M0G7W / 13750.0 - 14500.0 200KG7W - 54M0G7W / 11450.0 - 11700.0 Max Great Circle Coordination Distance 238.7 km / 148.3 mi 119.9 km / 74.5 mi Precipitation Scatter Contour Radius 522.9 km / 324.9 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 12/30/2016 Page 9 of 12

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values MT JACKSON, VA Licensee Name Telesat Network Services, Inc. Latitude (NAD 83) 38° 43' 42.0" N Longitude (NAD 83) 78° 39' 25.0" W Ground Elevation (AMSL) 283.22 m / 929.2 ft Antenna Centerline (AGL) 8.0 m / 26.2 ft Antenna Model Vertex 15 Meter Antenna Mode Receive 11.0 GHz Transmit 14.0 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -151.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -128.0 dBW/4 kHz 0.0025% Max Available RF Power -14.0 (dBW/4 kHz) Receive 11.0 GHz Transmit 14.0 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 0 0.45 106.87 -10.00 208.61 -10.00 100.00 5 0.44 101.97 -10.00 209.17 -10.00 100.00 10 0.49 97.08 -10.00 205.04 -10.00 100.00 15 0.39 92.17 -10.00 213.36 -10.00 100.94 20 0.51 87.27 -10.00 203.83 -10.00 100.00 25 0.26 82.37 -10.00 225.21 -10.00 110.85 30 0.00 77.49 -10.00 231.37 -10.00 115.80 35 0.00 72.60 -10.00 231.37 -10.00 115.80 40 0.00 67.72 -10.00 231.37 -10.00 115.80 45 0.00 62.84 -10.00 231.37 -10.00 115.80 50 0.00 57.98 -10.00 231.37 -10.00 115.80 55 0.30 53.09 -10.00 221.58 -10.00 107.87 60 0.79 48.17 -10.00 192.37 -10.00 100.00 65 1.39 43.23 -8.90 174.34 -8.90 100.00 70 2.48 38.19 -7.55 146.53 -7.55 100.00 75 3.85 33.07 -5.98 127.54 -5.98 100.00 80 4.16 28.17 -4.25 129.60 -4.25 100.00 85 4.43 23.33 -2.20 133.04 -2.20 100.00 90 4.83 18.51 0.31 138.00 0.31 100.00 95 4.85 14.00 3.35 152.71 3.35 100.00 100 4.53 10.19 6.80 181.20 6.80 100.00 105 3.39 8.63 8.60 222.83 8.60 105.32 110 3.51 8.68 8.53 205.92 8.53 100.00 115 3.50 11.32 5.66 194.46 5.66 100.00 120 3.27 15.08 2.54 183.48 2.54 100.00 125 3.51 18.45 0.35 162.97 0.35 100.00 130 3.60 21.80 -1.46 151.22 -1.46 100.00 135 3.42 25.19 -3.03 147.24 -3.03 100.00 140 3.03 28.59 -4.40 149.07 -4.40 100.00 145 1.98 32.30 -5.73 171.53 -5.73 100.00 150 1.36 35.47 -6.75 185.70 -6.75 100.00 155 0.70 38.43 -7.62 204.52 -7.62 100.00 160 0.48 40.70 -8.24 213.26 -8.24 100.00 165 0.22 42.64 -8.74 235.38 -8.74 117.70 170 0.00 44.10 -9.11 235.29 -9.11 118.02 175 0.00 44.89 -9.30 234.44 -9.30 117.54 180 0.00 45.15 -9.37 234.16 -9.37 117.38 185 0.26 44.64 -9.24 229.30 -9.24 113.37 Frequency Coordination and Interference Analysis Report 12/30/2016 Page 10 of 12

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values MT JACKSON, VA Licensee Name Telesat Network Services, Inc. Latitude (NAD 83) 38° 43' 42.0" N Longitude (NAD 83) 78° 39' 25.0" W Ground Elevation (AMSL) 283.22 m / 929.2 ft Antenna Centerline (AGL) 8.0 m / 26.2 ft Antenna Model Vertex 15 Meter Antenna Mode Receive 11.0 GHz Transmit 14.0 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -151.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -128.0 dBW/4 kHz 0.0025% Max Available RF Power -14.0 (dBW/4 kHz) Receive 11.0 GHz Transmit 14.0 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 190 0.27 43.84 -9.05 228.36 -9.05 112.40 195 0.00 42.83 -8.79 236.72 -8.79 118.81 200 0.00 41.12 -8.35 238.73 -8.35 119.93 205 0.24 38.82 -7.73 238.02 -7.73 118.69 210 0.80 36.37 -7.02 204.45 -7.02 100.00 215 0.87 34.85 -6.56 203.02 -6.56 100.00 220 0.92 33.95 -6.27 202.12 -6.27 100.00 225 0.47 34.17 -6.34 222.50 -6.34 104.46 230 1.04 34.03 -6.30 197.08 -6.30 100.00 235 1.51 34.64 -6.49 182.37 -6.49 100.00 240 1.03 36.73 -7.12 193.82 -7.12 100.00 245 0.82 39.02 -7.78 200.32 -7.78 100.00 250 0.90 41.50 -8.45 193.48 -8.45 100.00 255 0.95 44.36 -9.17 187.96 -9.17 100.00 260 1.90 46.96 -9.79 150.40 -9.79 100.00 265 2.80 49.96 -10.00 129.73 -10.00 100.00 270 1.46 54.28 -10.00 163.68 -10.00 100.00 275 1.06 58.20 -10.00 179.53 -10.00 100.00 280 0.97 62.09 -10.00 183.32 -10.00 100.00 285 1.04 66.00 -10.00 180.27 -10.00 100.00 290 1.11 69.99 -10.00 177.94 -10.00 100.00 295 1.46 74.00 -10.00 163.38 -10.00 100.00 300 1.58 78.11 -10.00 159.60 -10.00 100.00 305 1.35 82.30 -10.00 169.92 -10.00 100.00 310 1.13 86.48 -10.00 177.27 -10.00 100.00 315 1.19 90.64 -10.00 175.28 -10.00 100.00 320 1.19 94.81 -10.00 175.41 -10.00 100.00 325 1.16 98.97 -10.00 176.32 -10.00 100.00 330 1.42 103.14 -10.00 167.71 -10.00 100.00 335 1.52 107.28 -10.00 161.38 -10.00 100.00 340 1.24 111.28 -10.00 173.84 -10.00 100.00 345 0.84 115.16 -10.00 190.13 -10.00 100.00 350 0.79 116.68 -10.00 192.37 -10.00 100.00 355 0.58 111.77 -10.00 202.77 -10.00 100.00 Frequency Coordination and Interference Analysis Report 12/30/2016 Page 11 of 12

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: December 30, 2016 Frequency Coordination and Interference Analysis Report 12/30/2016 Page 12 of 12


Document Created: 2017-01-03 11:44:45
Document Modified: 2017-01-03 11:44:45
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