Attachment Exhibit A

This document pretains to SES-MOD-20120917-00835 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2012091700835_964597

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for Microspace Communications Corporation Auburn, North Carolina (Call Sign: E920645) Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 August 20, 2012

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 08/20/2012 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 08/20/2012 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 Alltel Communications LLC – North Carolina Cellco Partnership – North Carolina North Carolina State of, State Highway Patrol USCOC of North Carolina RSA#7, Inc. No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 08/20/2012 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 July 11, 2012. Company Alltel Communications LLC-North Carolina Alltel Communications of NC, LP Bellsouth Telecommunications, Inc. Burlington, City of Cellco Partnership - North Carolina Cellco Partnership-Newark-Dallas Verizon City of Durham, NC Conterra Ultra Broadband, LLC Duke Energy Business Services, LLC Duke Energy Carolinas LLC GREENSBORO CITY HARRIS CORPORATION HIGH POINT, CITY OF Johnston County 911 Communications Lenoir County Emergency Management National Radio Astronomy Observatory New Cingular Wireless PCS LLC - VA New Cingular Wireless PCS LLC- WV/NC/SC Norfolk Southern Railway North Carolina State Highway Patrol PITTSYLVANIA COUNTY UNIVERSITY OF NORTH CAROLINA USCOC of North Carolina RSA #7, Inc. USCOC of South Carolina RSA 4, Inc. Verizon Wireless (VAW) LLC-NC,SC, TN Verizon Wireless VAW LLC-Southern VA Frequency Coordination and Interference Analysis Report 08/20/2012 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 08/20/2012 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 08/20/2012 Job Number: 120711COMSJC06 Administrative Information Status ENGINEER PROPOSAL Call Sign E920645 Licensee Code P5306 Licensee Name Microspace Communications Corporation Site Information AUBURN, NORTH CAROLINA Venue Name Latitude (NAD 83) 35° 40' 27.6" N Longitude (NAD 83) 78° 32' 9.0" W Climate Zone A Rain Zone 1 Ground Elevation (AMSL) 88.39 m / 290.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 40° W to 143° West Longitude Azimuth Range 126.2° to 254.4° Corresponding Elevation Angles 32.1° / 12.0° Antenna Centerline (AGL) 4.88 m / 16.0 ft Antenna Information Receive Transmit Manufacturer RSI RSI Model 920C 920C Gain / Diameter 50.0 dBi / 9.2 m 53.0 dBi / 9.2 m 3-dB / 15-dB Beamwidth 0.52° / 1.06° 0.36° / 0.76° Max Available RF Power (dBW/4 kHz) -10.8 (dBW/MHz) 13.2 Maximum EIRP (dBW/4 kHz) 42.20 (dBW/MHz) 66.20 (dBW) 81.75 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) 36M0G7W / 3700.0 - 4200.0 36M0G7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 377.2 km / 234.4 mi 183.6 km / 114.1 mi Precipitation Scatter Contour Radius 614.4 km / 381.7 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 08/20/2012 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 AUBURN, NC Licensee Name Microspace Communications Corporation Latitude (NAD 83) 35° 40' 27.6" N Longitude (NAD 83) 78° 32' 9.0" W Ground Elevation (AMSL) 88.39 m / 290.0 ft Antenna Centerline (AGL) 4.88 m / 16.0 ft Antenna Model RSI 920C 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 -10.8 (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 1.17 105.29 -10.00 215.01 -10.00 100.00 5 1.30 110.20 -10.00 211.30 -10.00 100.00 10 1.47 112.34 -10.00 206.49 -10.00 100.00 15 1.80 108.21 -10.00 200.03 -10.00 100.00 20 1.98 103.98 -10.00 195.07 -10.00 100.00 25 2.40 99.73 -10.00 185.27 -10.00 100.00 30 2.44 95.40 -10.00 184.53 -10.00 100.00 35 2.58 91.06 -10.00 181.16 -10.00 100.00 40 2.61 86.71 -10.00 180.42 -10.00 100.00 45 2.63 82.36 -10.00 180.14 -10.00 100.00 50 2.68 78.02 -10.00 178.83 -10.00 100.00 55 2.61 73.72 -10.00 180.50 -10.00 100.00 60 2.49 69.47 -10.00 183.31 -10.00 100.00 65 2.20 65.32 -10.00 189.91 -10.00 100.00 70 1.63 61.36 -10.00 204.40 -10.00 100.00 75 1.00 57.56 -10.00 220.43 -10.00 100.00 80 1.30 53.53 -10.00 211.25 -10.00 100.00 85 1.40 49.69 -10.00 208.39 -10.00 100.00 90 1.40 46.07 -9.59 210.42 -9.59 100.00 95 1.28 42.73 -8.77 217.69 -8.77 100.00 100 1.43 39.49 -7.91 217.52 -7.91 100.00 105 1.55 36.59 -7.09 218.27 -7.09 100.00 110 1.43 34.31 -6.39 225.65 -6.39 100.00 115 1.27 32.61 -5.83 234.00 -5.83 100.00 120 1.01 31.63 -5.50 244.72 -5.50 106.71 125 0.64 31.47 -5.45 268.54 -5.45 123.44 130 0.62 31.68 -5.52 269.77 -5.52 124.39 135 0.60 32.57 -5.82 268.53 -5.82 124.02 140 0.69 34.01 -6.29 259.94 -6.29 118.77 145 0.50 36.25 -6.98 267.99 -6.98 125.43 150 0.35 38.90 -7.75 280.53 -7.75 133.84 155 0.27 41.60 -8.48 285.74 -8.48 138.59 160 0.00 44.12 -9.12 290.96 -9.12 143.38 165 0.00 46.01 -9.57 288.02 -9.57 141.97 170 0.00 47.42 -9.90 285.92 -9.90 140.97 175 0.00 48.29 -10.00 285.28 -10.00 140.66 180 0.21 48.38 -10.00 284.16 -10.00 139.86 Frequency Coordination and Interference Analysis Report 08/20/2012 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 AUBURN, NC Licensee Name Microspace Communications Corporation Latitude (NAD 83) 35° 40' 27.6" N Longitude (NAD 83) 78° 32' 9.0" W Ground Elevation (AMSL) 88.39 m / 290.0 ft Antenna Centerline (AGL) 4.88 m / 16.0 ft Antenna Model RSI 920C 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 -10.8 (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) 185 0.28 48.02 -10.00 275.65 -10.00 133.93 190 0.31 47.12 -9.83 272.45 -9.83 132.78 195 0.35 45.69 -9.50 269.40 -9.50 130.22 200 0.40 43.79 -9.03 267.32 -9.03 128.11 205 0.39 41.51 -8.45 271.12 -8.45 129.82 210 0.46 38.82 -7.73 268.06 -7.73 126.61 215 0.47 35.88 -6.87 272.22 -6.87 128.16 220 0.56 32.65 -5.85 271.67 -5.85 126.20 225 0.56 29.28 -4.66 278.98 -4.66 129.27 230 0.43 25.84 -3.31 301.43 -3.31 140.87 235 0.47 22.15 -1.63 309.09 -1.63 143.17 240 0.53 18.35 0.41 318.95 0.41 145.71 245 0.33 14.95 2.63 359.71 2.63 174.30 250 0.32 12.47 4.60 377.25 4.60 183.59 255 0.41 11.59 5.39 372.22 5.39 177.60 260 0.33 12.90 4.23 372.33 4.23 180.59 265 0.24 15.76 2.06 367.33 2.06 181.80 270 0.00 19.56 -0.29 354.42 -0.29 176.93 275 0.26 23.55 -2.30 331.04 -2.30 160.71 280 0.37 27.93 -4.15 303.01 -4.15 143.52 285 0.24 32.54 -5.81 307.46 -5.81 149.87 290 0.28 37.21 -7.27 292.49 -7.27 141.40 295 0.26 41.95 -8.57 286.78 -8.57 139.47 300 0.35 46.72 -9.74 268.69 -9.74 130.09 305 0.26 51.55 -10.00 277.54 -10.00 135.22 310 0.23 56.39 -10.00 281.62 -10.00 138.05 315 0.00 61.27 -10.00 285.28 -10.00 140.66 320 0.25 66.11 -10.00 279.21 -10.00 136.38 325 0.33 70.99 -10.00 269.67 -10.00 131.14 330 0.33 75.87 -10.00 268.93 -10.00 130.63 335 0.35 80.77 -10.00 267.08 -10.00 129.37 340 0.40 85.66 -10.00 261.12 -10.00 125.26 345 0.51 90.56 -10.00 249.33 -10.00 116.98 350 0.58 95.46 -10.00 244.63 -10.00 113.56 355 0.81 100.37 -10.00 230.71 -10.00 103.02 Frequency Coordination and Interference Analysis Report 08/20/2012 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: August 20, 2012 Frequency Coordination and Interference Analysis Report 08/20/2012 Page 10 of 10


Document Created: 2012-08-27 14:30:58
Document Modified: 2012-08-27 14:30:58
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