Attachment 6.3

This document pretains to SES-LIC-20120601-00481 for License on a Satellite Earth Station filing.

IBFS_SESLIC2012060100481_953599

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for TELECOMMUNICATION SYSTEMS, INC MANASSAS, VA Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 June 01, 2012

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 06/01/2012 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 06/01/2012 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. 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 Cellco Partnership-Newark-Dallas Verizon No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 06/01/2012 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. Company AT&T COMMUNICATIONS OF MARYLAND INC AT&T COMMUNICATIONS OF VIRGINIA INC AT&T CORP Alltel Communications LLC-Southern VA Alltel Communications of Petersburg Inc Appalachia Engineering Services Atlantic Broadband (Delmar), LLC Atlantic Broadband (Penn), LLC B20 LLC Baltimore County of Maryland Baltimore Gas and Electric Company Blue Ridge Carriers COLLEGE OF SOUTHERN MARYLAND Capital Communications of America Cellco Partnership - Southern Virginia Cellco Partnership-Newark-Dallas Verizon Cellco Partnership-WA/Baltimore Charles, County of Chesterfield, County of Comprehensive Wireless LLC Conterra Ultra Broadband, LLC County of Frederick County of Stafford ECW Wireless, LLC Eastern MLG LLC Enoch Pratt Free Library FELHC, Inc. Frederick County Fundamental Broadcasting LLC Garden State Transmissions Goochland County HENRICO COUNTY Hanover, County of Hardy Cellular Telephone Company Harrisonburg-Rockingham ECC King and Queen County Loudoun, County of MCI Communications Services Inc. METROPOLITAN AREA NETWORKS, INC. MVC Research. LLC Frequency Coordination and Interference Analysis Report 06/01/2012 Page 5 of 11

Maryland Public Broadcasting Commission Maryland State Highway Administration Maryland, State of - Dept.of Info & Tech National Radio Astronomy Observatory New Cingular Wireless PCS LLC - DC New Cingular Wireless PCS LLC - VA New Cingular Wireless PCS LLC- WV/NC/SC New Cingular Wireless PCS, LLC - PA New Kent County Norfolk Southern Railway Northern Virginia Electric Cooperative Prince George's County Prince William, County of RAPPAHANNOCK ELECTRIC COOPERATIVE RCTC Wholesale Corporation RICHMOND, CITY OF SCTF NET SHENANDOAH VALLEY ELECTRIC COOPERATIVE Southern Maryland Electric Cooperative I St. Mary's County of State of Maryland, MIEMSS State of WV DHHR/BPH STECS Thought Transmissions, LLC USCOC of Cumberland, Inc. USCOC of Virginia RSA #2, Inc. USCOC of Virginia RSA #3, Inc. Verizon Maryland, Inc. Verizon Wireless VAW LLC-Southern VA Virginia Broadband, LLC Virginia Cellular LLC Virginia Department of State Police Virginia Electric & Power Company Virginia PCS Alliance, L.C. WASHINGTON SUBURBAN SANITARY COMMISSION Washington D.C. SMSA L.P. Washington Gas Light Company World Class Wireless LLC iSignal Frequency Coordination and Interference Analysis Report 06/01/2012 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 06/01/2012 Page 7 of 11

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 06/01/2012 Job Number: 120601COMSTC02 Administrative Information Licensee Name TELECOMMUNICATION SYSTEMS, INC Site Information MANASSAS, VA Latitude (NAD 83) 38° 43' 55.0" N Longitude (NAD 83) 77° 31' 50.7" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 58.4 m / 191.6 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 18° W to 139° West Longitude Azimuth Range 110.2° to 251.2° Corresponding Elevation Angles 14.9° / 13.4° Antenna Centerline (AGL) 3.1 m / 10.2 ft Antenna Information Receive Transmit Manufacturer Vertex Vertex Gain / Diameter 46.5 dBi / 6.3 m 50.4 dBi / 6.3 m 3-dB / 15-dB Beamwidth 0.80° / 1.60° 0.50° / 1.00° Max Available RF Power (dBW/4 kHz) -12.2 (dBW/MHz) 11.8 Maximum EIRP (dBW/4 kHz) 38.2 (dBW/MHz) 62.2 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) 4M00G7W / 3700.0 - 4200.0 30M0G7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 342.2 km / 212.6 mi 160.7 km / 99.9 mi Precipitation Scatter Contour Radius 524.7 km / 326.0 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 06/01/2012 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 MANASSAS, VA Licensee Name TELECOMMUNICATION SYSTEMS, INC Latitude (NAD 83) 38° 43' 55.0" N Longitude (NAD 83) 77° 31' 50.7" W Ground Elevation (AMSL) 58.4 m / 191.6 ft Antenna Centerline (AGL) 3.1 m / 10.2 ft 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 -12.2 (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 0.60 108.30 -10.00 243.57 -10.00 109.04 5 0.62 104.73 -10.00 242.31 -10.00 108.12 10 0.57 99.89 -10.00 245.49 -10.00 110.45 15 0.55 95.05 -10.00 246.55 -10.00 111.22 20 0.55 90.20 -10.00 246.56 -10.00 111.22 25 0.54 85.36 -10.00 247.43 -10.00 111.86 30 0.67 80.51 -10.00 238.75 -10.00 105.46 35 0.83 75.66 -10.00 229.57 -10.00 100.00 40 0.84 70.83 -10.00 229.21 -10.00 100.00 45 1.05 65.98 -10.00 218.62 -10.00 100.00 50 1.11 61.15 -10.00 216.75 -10.00 100.00 55 1.11 56.35 -10.00 216.75 -10.00 100.00 60 1.13 51.57 -10.00 216.13 -10.00 100.00 65 1.19 46.81 -9.76 215.69 -9.76 100.00 70 1.12 42.12 -8.61 223.57 -8.61 100.00 75 0.92 37.55 -7.36 239.08 -7.36 101.54 80 0.83 33.04 -5.98 252.78 -5.98 109.21 85 0.81 28.65 -4.43 263.86 -4.43 114.54 90 0.77 24.49 -2.72 277.98 -2.72 121.33 95 0.77 20.64 -0.87 291.09 -0.87 126.79 100 0.77 17.37 1.01 305.13 1.01 132.40 105 0.53 15.27 2.41 334.52 2.41 147.77 110 0.53 14.37 3.06 339.77 3.06 150.15 115 0.53 15.13 2.50 335.29 2.50 148.12 120 0.36 17.46 0.95 342.20 0.95 156.98 125 0.32 20.65 -0.87 333.52 -0.87 154.35 130 0.00 24.35 -2.66 336.61 -2.66 160.72 135 0.00 27.68 -4.05 326.45 -4.05 155.63 140 0.00 30.85 -5.23 318.03 -5.23 151.52 145 0.00 33.83 -6.23 310.38 -6.23 148.15 150 0.00 36.56 -7.08 304.56 -7.08 145.41 155 0.00 39.01 -7.78 299.80 -7.78 143.18 160 0.00 41.11 -8.35 295.99 -8.35 141.42 165 0.00 42.83 -8.79 293.07 -8.79 140.08 170 0.00 44.10 -9.11 291.00 -9.11 139.13 175 0.29 44.60 -9.23 279.01 -9.23 132.47 180 0.00 45.15 -9.37 289.34 -9.37 138.38 185 0.00 44.88 -9.30 289.76 -9.30 138.57 Frequency Coordination and Interference Analysis Report 06/01/2012 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 MANASSAS, VA Licensee Name TELECOMMUNICATION SYSTEMS, INC Latitude (NAD 83) 38° 43' 55.0" N Longitude (NAD 83) 77° 31' 50.7" W Ground Elevation (AMSL) 58.4 m / 191.6 ft Antenna Centerline (AGL) 3.1 m / 10.2 ft 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 -12.2 (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 0.27 43.84 -9.05 282.71 -9.05 133.39 195 0.64 42.24 -8.64 248.96 -8.64 110.88 200 0.31 40.84 -8.28 282.28 -8.28 133.20 205 0.22 38.82 -7.73 297.09 -7.73 141.16 210 0.45 36.20 -6.97 274.06 -6.97 125.64 215 0.60 33.37 -6.08 267.22 -6.08 119.52 220 0.51 30.48 -5.10 279.74 -5.10 126.44 225 0.39 27.40 -3.94 302.10 -3.94 138.07 230 0.67 23.87 -2.45 286.96 -2.45 126.83 235 0.74 20.37 -0.72 294.63 -0.72 128.83 240 0.91 16.74 1.41 298.53 1.41 127.41 245 0.72 14.11 3.26 327.08 3.26 140.58 250 0.77 12.71 4.40 333.19 4.40 142.42 255 0.85 13.11 4.06 324.17 4.06 136.98 260 0.89 15.26 2.41 307.58 2.41 131.26 265 0.98 18.49 0.33 285.61 0.33 121.01 270 1.05 22.37 -1.74 267.81 -1.74 112.76 275 0.99 26.67 -3.65 257.54 -3.65 108.83 280 0.94 31.16 -5.34 249.53 -5.34 105.94 285 1.18 35.69 -6.81 231.54 -6.81 100.00 290 1.24 40.37 -8.15 222.32 -8.15 100.00 295 1.25 45.11 -9.36 215.84 -9.36 100.00 300 1.14 49.93 -10.00 215.88 -10.00 100.00 305 0.90 54.78 -10.00 225.49 -10.00 100.00 310 0.58 59.65 -10.00 244.39 -10.00 109.64 315 0.39 64.51 -10.00 262.58 -10.00 122.48 320 0.30 69.37 -10.00 272.85 -10.00 129.48 325 0.46 74.21 -10.00 254.64 -10.00 116.92 330 0.64 79.07 -10.00 241.08 -10.00 107.20 335 0.83 83.94 -10.00 229.91 -10.00 100.00 340 0.87 88.82 -10.00 227.61 -10.00 100.00 345 0.60 93.69 -10.00 243.43 -10.00 108.94 350 0.55 98.57 -10.00 246.32 -10.00 111.05 355 0.66 103.44 -10.00 239.54 -10.00 106.05 Frequency Coordination and Interference Analysis Report 06/01/2012 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. Timothy O. Crutcher Frequency Planner COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 DATED: June 01, 2012 Frequency Coordination and Interference Analysis Report 06/01/2012 Page 11 of 11


Document Created: 2012-06-01 10:05:20
Document Modified: 2012-06-01 10:05:20
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