Attachment Exhibit A

This document pretains to SES-MOD-20101213-01546 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2010121301546_856265

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for CSC Ft. Meade, Maryland (Call Sign: E920590) Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 December 9, 2010

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 12/09/2010 Page 2 of 11

1. CONCLUSIONS An interference study considering all existing, proposed and prior coordinated microwave facilities within the coordination contours of the existing earth station demonstrates that this site will operate satisfactorily with the common carrier microwave environment, based upon the restrictions noted in the Summary of Results (Section 2). Frequency Coordination and Interference Analysis Report 12/09/2010 Page 3 of 11

2. SUMMARY OF RESULTS A number of great circle interference cases were identified during the interference study of the existing 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 most cases. 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 and frequency separation are considered on the interfering paths, sufficient losses exist to negate harmful interference from occurring with the existing transmit-receive earth station. Further, the transmit spectrum will be limited to frequencies 5925.0 to 6077.45 MHz, 6109.45 to 6240.54 MHz, 6272.54 to 6388.79 MHz, and 6420.79 to 6425.0 MHz. Company Baltimore County of Maryland New Cingular Wireless PCS, LLC - DC State of Maryland MIEMSS Washington Gas Light Company Washington Suburban Sanitary Commission No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 12/09/2010 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. Expedited Coordination data for this earth station was emailed and sent to the below listed carriers with a letter dated November 18, 2010. Company AT&T COMMUNICATIONS OF MARYLAND INC AT&T COMMUNICATIONS OF VIRGINIA INC AT&T CORP Allegheny Power Service Corporation Alltel Communications of Virginia #1 LLC Atlantic Broadband (Delmar), LLC Atlantic Broadband (Penn), LLC BAY BROADBAND COMMUNICATIONS LLC Baltimore County of Maryland Baltimore Gas and Electric Company COLLEGE OF SOUTHERN MARYLAND Cellco Partnership - Southern Virginia Cellco Partnership- PA Region Cellco Partnership-Newark-Dallas Verizon Cellco Partnership-Washington/Baltimore Charles, County of Conterra Ultra Broadband, LLC County of Frederick County of Stafford DELAWARE STATE - DTI Enoch Pratt Free Library Exelon Generation Company, L.L.C Frederick County Hardy Cellular Telephone Company International Communications Group, Inc. King and Queen County Local Communications Network, Inc. Loudoun, County of MCI Communications Services Inc. METROPOLITAN AREA NETWORKS, INC. Maryland Public Broadcasting Commission Maryland State Highway Administration Maryland, State of - Budget & Management National Radio Astronomy Observatory Frequency Coordination and Interference Analysis Report 12/09/2010 Page 5 of 11

Company (Continued) New Cingular Wireless PCS - VA/DC/MD New Cingular Wireless PCS LLC - DC New Cingular Wireless PCS LLC- DE/NH/RI New Cingular Wireless PCS, LLC - PA Northern Virginia Electric Cooperative Open Range Communications PENNSYLVANIA TURNPIKE COMMISSION Prince George's County Prince William, County of RAPPAHANNOCK ELECTRIC COOPERATIVE SCTF NET SHENANDOAH VALLEY ELECTRIC COOPERATIVE Southern Maryland Electric Cooperative I State of Maryland, MIEMSS State of WV DHHR/BPH STECS Texas Eastern Communications, Inc. USCOC of Cumberland, Inc. Verizon Maryland, Inc. Virginia Broadband, 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 York County Dept of Emergency Services Frequency Coordination and Interference Analysis Report 12/09/2010 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 12/09/2010 Page 7 of 11

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 12/09/2010 Job Number: 101118COMSJC02 Administrative Information Status ENGINEER PROPOSAL Call Sign E920590 Licensee Code ZDYNCO Licensee Name CSC Site Information FT MEADE, MARYLAND Venue Name Latitude (NAD 83) 39° 6' 17.4" N Longitude (NAD 83) 76° 45' 48.9" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 49.68 m / 163.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Analog & Digital Satellite Arc 70° W to 136° West Longitude Azimuth Range 169.4° to 249.4° Corresponding Elevation Angles 44.2° / 15.0° Antenna Centerline (AGL) 7.32 m / 24.0 ft Antenna Information Receive Transmit Manufacturer Andrew Corporation Andrew Corporation Model ESA120-46HP ESA120-46HP Gain / Diameter 52.5 dBi / 12.0 m 55.9 dBi / 12.0 m 3-dB / 15-dB Beamwidth 0.40° / 0.80° 0.30° / 0.60° Max Available RF Power (dBW/4 kHz) -11.9 (dBW/MHz) 11.5 Maximum EIRP (dBW/4 kHz) 44.0 (dBW/MHz) 67.4 Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -144.0 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) 882KF9W / 3700.0 - 4200.0 882KF9W / 5925.00 - 6077.45 882KF9W / 6109.45 - 6240.54 882KF9W / 6272.54 - 6388.79 882KF9W / 6420.79 - 6425.00 Max Great Circle Coordination Distance 346.5 km / 215.3 mi 172.5 km / 107.2 mi Precipitation Scatter Contour Radius 516.5 km / 320.9 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 12/09/2010 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 FT MEADE, MD Licensee Name CSC Latitude (NAD 83) 39° 6' 17.4" N Longitude (NAD 83) 76° 45' 48.9" W Ground Elevation (AMSL) 49.68 m / 163.0 ft Antenna Centerline (AGL) 7.32 m / 24.0 ft Antenna Model Andrew Corporation 12 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 -144.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -11.9 (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 1.04 109.95 -10.00 209.52 -10.00 100.00 5 1.15 114.79 -10.00 206.16 -10.00 100.00 10 1.29 119.62 -10.00 204.64 -10.00 100.00 15 1.29 124.42 -10.00 204.79 -10.00 100.00 20 1.08 128.92 -10.00 208.25 -10.00 100.00 25 0.99 126.33 -10.00 211.03 -10.00 100.00 30 0.96 123.56 -10.00 212.82 -10.00 100.00 35 1.25 120.79 -10.00 205.95 -10.00 100.00 40 1.46 117.76 -10.00 200.11 -10.00 100.00 45 1.55 114.53 -10.00 197.64 -10.00 100.00 50 1.72 111.20 -10.00 192.88 -10.00 100.00 55 1.32 107.59 -10.00 203.84 -10.00 100.00 60 1.45 104.09 -10.00 200.47 -10.00 100.00 65 1.58 100.51 -10.00 196.72 -10.00 100.00 70 1.53 96.87 -10.00 198.21 -10.00 100.00 75 1.80 93.21 -10.00 190.66 -10.00 100.00 80 1.76 89.52 -10.00 191.80 -10.00 100.00 85 1.70 85.84 -10.00 193.32 -10.00 100.00 90 1.66 82.17 -10.00 194.46 -10.00 100.00 95 1.49 78.57 -10.00 199.34 -10.00 100.00 100 1.34 75.02 -10.00 203.47 -10.00 100.00 105 0.77 71.68 -10.00 222.63 -10.00 101.97 110 0.36 68.42 -10.00 253.39 -10.00 125.11 115 0.00 65.30 -10.00 272.88 -10.00 137.41 120 0.00 62.15 -10.00 272.88 -10.00 137.41 125 0.00 59.15 -10.00 272.88 -10.00 137.41 130 0.00 56.32 -10.00 272.88 -10.00 137.41 135 0.00 53.70 -10.00 272.88 -10.00 137.41 140 0.00 51.31 -10.00 272.88 -10.00 137.41 145 0.00 49.21 -10.00 272.88 -10.00 137.41 150 0.00 47.42 -9.90 273.49 -9.90 137.70 155 0.00 45.99 -9.57 275.51 -9.57 138.67 160 0.00 44.96 -9.32 277.02 -9.32 139.40 165 0.00 44.35 -9.17 277.93 -9.17 139.84 170 0.00 44.19 -9.13 278.18 -9.13 139.96 175 0.00 44.47 -9.20 277.76 -9.20 139.76 180 0.00 44.73 -9.26 277.36 -9.26 139.57 185 0.00 44.47 -9.20 277.76 -9.20 139.76 Frequency Coordination and Interference Analysis Report 12/09/2010 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 FT MEADE, MD Licensee Name CSC Latitude (NAD 83) 39° 6' 17.4" N Longitude (NAD 83) 76° 45' 48.9" W Ground Elevation (AMSL) 49.68 m / 163.0 ft Antenna Centerline (AGL) 7.32 m / 24.0 ft Antenna Model Andrew Corporation 12 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 -144.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -11.9 (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 0.00 43.70 -9.01 278.93 -9.01 140.33 195 0.00 42.44 -8.69 280.90 -8.69 141.29 200 0.00 40.75 -8.25 283.68 -8.25 142.64 205 0.00 38.66 -7.68 287.31 -7.68 144.43 210 0.00 36.24 -6.98 291.85 -6.98 146.68 215 0.00 33.53 -6.14 297.41 -6.14 149.47 220 0.00 30.58 -5.14 304.14 -5.14 152.88 225 0.21 27.28 -3.90 310.90 -3.90 155.84 230 0.00 24.12 -2.56 322.81 -2.56 162.22 235 0.23 20.52 -0.80 331.73 -0.80 165.84 240 0.27 17.42 0.98 339.82 0.98 170.23 245 0.30 15.32 2.37 346.47 2.37 172.51 250 0.36 14.64 2.86 342.68 2.86 168.22 255 0.45 15.55 2.21 325.80 2.21 154.53 260 0.39 17.96 0.64 321.68 0.64 154.68 265 0.27 21.30 -1.21 322.73 -1.21 159.37 270 0.00 25.27 -3.06 319.23 -3.06 160.34 275 0.00 29.39 -4.70 307.11 -4.70 154.39 280 0.00 33.73 -6.20 296.98 -6.20 149.25 285 0.23 38.14 -7.54 284.58 -7.54 142.18 290 0.28 42.72 -8.77 270.11 -8.77 133.74 295 0.23 47.40 -9.90 269.74 -9.90 135.07 300 0.26 52.11 -10.00 265.65 -10.00 133.64 305 0.00 56.91 -10.00 272.88 -10.00 137.41 310 0.24 61.64 -10.00 267.76 -10.00 133.84 315 0.30 66.43 -10.00 260.68 -10.00 130.22 320 0.31 71.24 -10.00 259.85 -10.00 129.65 325 0.31 76.06 -10.00 259.97 -10.00 129.73 330 0.31 80.89 -10.00 259.30 -10.00 129.26 335 0.00 85.73 -10.00 272.88 -10.00 137.41 340 0.44 90.56 -10.00 244.34 -10.00 118.68 345 0.66 95.41 -10.00 228.65 -10.00 106.79 350 0.82 100.26 -10.00 220.03 -10.00 100.00 355 0.95 105.10 -10.00 213.22 -10.00 100.00 Frequency Coordination and Interference Analysis Report 12/09/2010 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. Jeffrey E. Cowles Engineer III, Telecommunications COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Va. 20147 DATED: December 9, 2010 Frequency Coordination and Interference Analysis Report 12/09/2010 Page 11 of 11


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Document Modified: 2019-04-08 19:43:49
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