Attachment ComSearch Analysis

This document pretains to SES-AMD-20140507-00341 for Amended Filing on a Satellite Earth Station filing.

IBFS_SESAMD2014050700341_1045067

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for American University - WAMU Radio Washington, DC (Call Sign: E050067) Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 March 26, 2014

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 03/26/2014 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 03/26/2014 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 receive-only earth station. Company None No carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 03/26/2014 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 February 28, 2014. Company AT&T Corporation Firstlevel Networks MCI Communications Services Inc. Open Line Communications Frequency Coordination and Interference Analysis Report 03/26/2014 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 03/26/2014 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 03/26/2014 Job Number: 140228COMSJC15 Administrative Information Status ENGINEER PROPOSAL Call Sign E050067 Licensee Code SAMRUN Licensee Name The American University Site Information WASHINGTON, DC Venue Name Latitude (NAD 83) 38° 56' 44.3" N Longitude (NAD 83) 77° 3' 49.7" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 71.93 m / 236.0 ft Link Information Satellite Type Geostationary Mode RO - Receive-Only Modulation Digital Satellite Arc 60° W to 143° West Longitude Azimuth Range 154.0° to 254.3° Corresponding Elevation Angles 41.5° / 9.9° Antenna Centerline (AGL) 27.13 m / 89.0 ft Antenna Information Receive Manufacturer Comtech Antenna Systems Model 3.8 Meter PF Gain / Diameter 42.9 dBi / 3.8 m 3-dB / 15-dB Beamwidth 1.23° / 2.33° Interference Objectives: Long Term -156.0 dBW/MHz 20% Short Term -146.0 dBW/MHz 0.01% Frequency Information Receive 4.0 GHz Emission / Frequency Range (MHz) 30K0G7W - 10M3G7W / 3700.0 - 4200.0 Max Great Circle Coordination Distance 400.3 km / 248.7 mi Precipitation Scatter Contour Radius 540.9 km / 336.1 mi Frequency Coordination and Interference Analysis Report 03/26/2014 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 WASHINGTON, DC Licensee Name The American University Latitude (NAD 83) 38° 56' 44.3" N Longitude (NAD 83) 77° 3' 49.7" W Ground Elevation (AMSL) 71.93 m / 236.0 ft Antenna Centerline (AGL) 27.13 m / 89.0 ft Antenna Model Comtech Antenna Systems 3.8 Meter PF Antenna Mode Receive 4.0 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% Short Term -146.0 dBW/MHz 0.01% Receive 4.0 GHz Horizon Antenna Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) 0 0.00 105.44 -10.00 285.28 5 0.00 110.36 -10.00 285.28 10 0.00 115.27 -10.00 285.28 15 0.00 120.17 -10.00 285.28 20 0.00 121.32 -10.00 285.28 25 0.00 118.09 -10.00 285.28 30 0.00 114.73 -10.00 285.28 35 0.00 111.26 -10.00 285.28 40 0.00 107.71 -10.00 285.28 45 0.00 104.09 -10.00 285.28 50 0.00 100.42 -10.00 285.28 55 0.00 96.71 -10.00 285.28 60 0.00 92.98 -10.00 285.28 65 0.00 89.23 -10.00 285.28 70 0.00 85.49 -10.00 285.28 75 0.00 81.77 -10.00 285.28 80 0.00 78.07 -10.00 285.28 85 0.00 74.42 -10.00 285.28 90 0.00 70.83 -10.00 285.28 95 0.00 67.30 -10.00 285.28 100 0.00 63.88 -10.00 285.28 105 0.00 60.57 -10.00 285.28 110 0.00 57.40 -10.00 285.28 115 0.00 54.41 -10.00 285.28 120 0.00 51.63 -10.00 285.28 125 0.00 49.09 -10.00 285.28 130 0.00 46.84 -9.77 286.77 135 0.00 44.93 -9.31 289.68 140 0.00 43.41 -8.94 292.11 145 0.00 42.32 -8.66 293.93 150 0.00 41.69 -8.50 295.00 155 0.00 41.54 -8.46 295.25 160 0.00 41.89 -8.55 294.66 165 0.00 42.71 -8.76 293.27 170 0.00 43.87 -9.05 291.37 175 0.00 44.64 -9.24 290.13 180 0.00 44.91 -9.31 289.72 185 0.00 44.64 -9.24 290.13 Frequency Coordination and Interference Analysis Report 03/26/2014 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 WASHINGTON, DC Licensee Name The American University Latitude (NAD 83) 38° 56' 44.3" N Longitude (NAD 83) 77° 3' 49.7" W Ground Elevation (AMSL) 71.93 m / 236.0 ft Antenna Centerline (AGL) 27.13 m / 89.0 ft Antenna Model Comtech Antenna Systems 3.8 Meter PF Antenna Mode Receive 4.0 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% Short Term -146.0 dBW/MHz 0.01% Receive 4.0 GHz Horizon Antenna Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) 190 0.00 43.87 -9.05 291.37 195 0.37 42.27 -8.65 273.15 200 0.71 40.27 -8.13 247.08 205 0.72 38.21 -7.55 250.37 210 0.73 35.79 -6.84 253.64 215 0.83 33.02 -5.97 252.88 220 0.89 30.04 -4.94 255.57 225 0.90 26.89 -3.74 262.89 230 1.11 23.43 -2.25 261.99 235 1.15 19.96 -0.51 272.30 240 1.06 16.48 1.58 291.33 245 0.91 12.94 4.20 321.44 250 0.79 10.10 6.89 352.63 255 0.71 9.24 7.86 400.29 260 0.79 10.74 6.22 346.55 265 0.87 13.97 3.37 317.56 270 0.97 18.00 0.62 288.38 275 0.99 22.45 -1.78 270.02 280 0.88 27.12 -3.83 263.29 285 0.92 31.85 -5.58 249.55 290 0.98 36.64 -7.10 237.18 295 1.00 41.48 -8.45 228.43 300 1.03 46.35 -9.65 221.19 305 1.05 51.24 -10.00 218.63 310 0.86 56.17 -10.00 228.11 315 0.71 61.10 -10.00 236.35 320 0.48 66.03 -10.00 252.47 325 0.29 70.97 -10.00 274.65 330 0.00 75.90 -10.00 285.28 335 0.00 80.82 -10.00 285.28 340 0.25 85.74 -10.00 278.92 345 0.00 90.67 -10.00 285.28 350 0.30 95.60 -10.00 273.43 355 0.28 100.53 -10.00 275.04 Frequency Coordination and Interference Analysis Report 03/26/2014 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: March 26, 2014 Frequency Coordination and Interference Analysis Report 03/26/2014 Page 10 of 10


Document Created: 2014-03-26 19:05:08
Document Modified: 2014-03-26 19:05:08
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