Attachment Laurel.FinalReport

This document pretains to SES-LIC-20121108-00997 for License on a Satellite Earth Station filing.

IBFS_SESLIC2012110800997_974370

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for Americom Government Services, Inc. LAUREL, MD Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 November 6, 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 11/06/2012 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 11/06/2012 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 Baltimore County of Maryland Eastern MLG LLC ECW Wireless, LLC Garden State Transmissions iSignal New Cingular Wireless PCS - Maryland State of Maryland, MIEMSS Washington Gas Light Company No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 11/06/2012 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 with a letter dated 09/25/2012. Company ADAMS COUNTY EMERGENCY MANAGEMENT AGENCY AT&T COMMUNICATIONS OF MARYLAND INC AT&T CORP Appalachia Engineering Services B20 LLC BAY BROADBAND COMMUNICATIONS 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-WDC/Baltimore Cellco Prtnrshp - Phil. Tri-State Rgn Charles, County of Comprehensive Wireless LLC Conterra Ultra Broadband, LLC County of Frederick Delaware Division of Communications ECW Wireless, LLC Eastern MLG LLC Enoch Pratt Free Library Exelon Generation Company, L.L.C FELHC, Inc. Frederick County Fundamental Broadcasting LLC Garden State Transmissions Hardy Cellular Telephone Company King and Queen County Loudoun County, Virginia MCI Communications Services Inc. MVC Research. LLC Maryland Public Broadcasting Commission Maryland State Highway Administration Maryland, State of - Dept.of Info & Tech National Radio Astronomy Observatory New Cingular Wireless PCS - Maryland New Cingular Wireless PCS LLC - DC New Cingular Wireless PCS LLC - VA Frequency Coordination and Interference Analysis Report 11/06/2012 Page 5 of 11

New Cingular Wireless PCS LLC-DE/NH/RI New Cingular Wireless PCS, LLC - PA Norfolk Southern Railway Prince George's County Prince William, County of RAPPAHANNOCK ELECTRIC COOPERATIVE SCTF NET SHENANDOAH VALLEY ELECTRIC COOPERATIVE Southern Maryland Electric Cooperative I St. Mary's County of (MD) Stafford, County of State of Maryland, MIEMSS State of WV DHHR/BPH STECS Thought Transmissions, LLC USCOC of Cumberland, Inc. Verizon Maryland, Inc. Verizon Wireless (VAW) LLC - Maryland Verizon Wireless (VAW) LLC-Pennsylvania Verizon Wireless VAW LLC-Southern VA Virginia Broadband, LLC Virginia Department of State Police Virginia Electric & Power Company Virginia PCS Alliance, L.C. Washington D.C. SMSA L.P. Washington Gas Light Company Washington Suburban Sanitary Commission World Class Wireless LLC iSignal Frequency Coordination and Interference Analysis Report 11/06/2012 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 11/06/2012 Page 7 of 11

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 10/24/2012 Job Number: 120925COMSGE01 Administrative Information Status ENGINEER PROPOSAL Call Sign Licensee Code AMGOSE Licensee Name Americom Government Services, Inc. Site Information LAUREL, MD Venue Name Latitude (NAD 83) 39° 2' 43.0" N Longitude (NAD 83) 76° 51' 46.0" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 48.77 m / 160.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 18° W to 91° West Longitude Azimuth Range 110.8° to 201.8° Corresponding Elevation Angles 15.3° / 42.5° Antenna Centerline (AGL) 6.4 m / 21.0 ft Antenna Information Receive - FCC32 Transmit - FCC32 Manufacturer Satcom Technologies Satcom Technologies Model 1100 CS 1100 CS Gain / Diameter 51.9 dBi / 11.3 m 55.4 dBi / 11.3 m 3-dB / 15-dB Beamwidth 0.80° / 1.60° 0.29° / 0.58° Max Available RF Power (dBW/4 kHz) -12.6 (dBW/MHz) 11.4 Maximum EIRP (dBW/4 kHz) 42.8 (dBW/MHz) 66.8 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 375.1 km / 233.1 mi 180.3 km / 112.0 mi Precipitation Scatter Contour Radius 517.7 km / 321.7 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 11/06/2012 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 LAUREL, MD Licensee Name Americom Government Services, Inc. Latitude (NAD 83) 39° 2' 43.0" N Longitude (NAD 83) 76° 51' 46.0" W Ground Elevation (AMSL) 48.77 m / 160.0 ft Antenna Centerline (AGL) 6.4 m / 21.0 ft Antenna Model Satcom Technologies 11.3 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 -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -12.6 (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 1.00 110.16 -10.00 220.27 -10.00 100.00 5 1.15 105.35 -10.00 215.70 -10.00 100.00 10 1.23 100.51 -10.00 213.21 -10.00 100.00 15 1.22 95.66 -10.00 213.65 -10.00 100.00 20 1.19 90.81 -10.00 214.54 -10.00 100.00 25 1.20 85.96 -10.00 214.23 -10.00 100.00 30 1.19 81.12 -10.00 214.44 -10.00 100.00 35 1.15 76.28 -10.00 215.82 -10.00 100.00 40 1.16 71.44 -10.00 215.45 -10.00 100.00 45 0.98 66.63 -10.00 221.21 -10.00 100.00 50 0.86 61.84 -10.00 227.97 -10.00 100.00 55 0.74 57.07 -10.00 234.58 -10.00 101.25 60 0.67 52.33 -10.00 239.00 -10.00 104.60 65 0.56 47.64 -9.95 246.11 -9.95 109.76 70 0.37 43.02 -8.84 271.81 -8.84 125.97 75 0.23 38.48 -7.63 297.23 -7.63 139.88 80 0.00 34.08 -6.31 309.82 -6.31 146.58 85 0.25 29.63 -4.79 314.00 -4.79 146.32 90 0.00 25.64 -3.22 332.48 -3.22 157.18 95 0.00 21.88 -1.50 345.24 -1.50 163.60 100 0.00 18.67 0.22 358.32 0.22 171.92 105 0.00 16.34 1.67 369.53 1.67 177.52 110 0.00 15.31 2.37 375.10 2.37 180.26 115 0.00 15.83 2.01 372.23 2.01 178.85 120 0.00 17.77 0.76 362.45 0.76 173.99 125 0.00 20.73 -0.91 349.66 -0.91 165.86 130 0.00 24.16 -2.58 337.24 -2.58 159.55 135 0.00 27.47 -3.97 327.04 -3.97 154.50 140 0.00 30.63 -5.15 318.59 -5.15 150.42 145 0.00 33.58 -6.15 310.94 -6.15 147.10 150 0.00 36.29 -7.00 305.11 -7.00 144.39 155 0.00 38.72 -7.70 300.35 -7.70 142.19 160 0.00 40.81 -8.27 296.53 -8.27 140.46 165 0.00 42.50 -8.71 293.61 -8.71 139.13 170 0.31 43.46 -8.95 277.91 -8.95 130.23 175 0.32 44.21 -9.14 275.40 -9.14 128.84 180 0.21 44.58 -9.23 288.57 -9.23 136.48 185 0.00 44.53 -9.22 290.31 -9.22 137.65 Frequency Coordination and Interference Analysis Report 11/06/2012 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 LAUREL, MD Licensee Name Americom Government Services, Inc. Latitude (NAD 83) 39° 2' 43.0" N Longitude (NAD 83) 76° 51' 46.0" W Ground Elevation (AMSL) 48.77 m / 160.0 ft Antenna Centerline (AGL) 6.4 m / 21.0 ft Antenna Model Satcom Technologies 11.3 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 -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -12.6 (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 43.76 -9.03 291.54 -9.03 138.20 195 0.00 42.89 -8.81 292.96 -8.81 138.84 200 0.21 42.28 -8.65 292.57 -8.65 138.32 205 0.21 42.34 -8.67 292.18 -8.67 138.08 210 0.00 43.09 -8.86 292.63 -8.86 138.69 215 0.00 44.09 -9.11 291.02 -9.11 137.97 220 0.00 45.51 -9.45 288.79 -9.45 136.97 225 0.00 47.31 -9.87 286.09 -9.87 135.77 230 0.24 49.26 -10.00 279.83 -10.00 133.05 235 0.52 51.51 -10.00 248.48 -10.00 111.55 240 0.42 54.30 -10.00 258.91 -10.00 118.86 245 0.00 57.47 -10.00 285.28 -10.00 135.42 250 0.52 60.28 -10.00 248.71 -10.00 111.72 255 0.61 63.51 -10.00 242.97 -10.00 107.54 260 0.48 66.94 -10.00 252.57 -10.00 114.39 265 0.37 70.46 -10.00 264.67 -10.00 122.84 270 0.62 73.94 -10.00 242.02 -10.00 106.84 275 0.30 77.63 -10.00 272.45 -10.00 128.13 280 0.42 81.27 -10.00 258.71 -10.00 118.72 285 0.43 84.96 -10.00 257.62 -10.00 117.96 290 0.51 88.67 -10.00 248.89 -10.00 111.85 295 0.53 92.39 -10.00 247.62 -10.00 110.93 300 0.67 96.11 -10.00 238.90 -10.00 104.52 305 0.77 99.82 -10.00 233.32 -10.00 100.29 310 0.60 103.46 -10.00 243.47 -10.00 107.90 315 0.48 107.04 -10.00 251.51 -10.00 113.64 320 0.58 110.61 -10.00 244.77 -10.00 108.86 325 0.84 114.17 -10.00 229.17 -10.00 100.00 330 0.97 117.61 -10.00 221.67 -10.00 100.00 335 0.90 120.82 -10.00 225.96 -10.00 100.00 340 0.88 123.90 -10.00 226.55 -10.00 100.00 345 0.72 124.52 -10.00 236.10 -10.00 102.41 350 0.66 119.73 -10.00 239.53 -10.00 104.99 355 0.78 114.95 -10.00 232.78 -10.00 100.00 Frequency Coordination and Interference Analysis Report 11/06/2012 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. BY: _ Gary K. Edwards Senior Manager COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 DATED: November 6, 2012 Frequency Coordination and Interference Analysis Report 11/06/2012 Page 11 of 11


Document Created: 2012-11-06 09:08:30
Document Modified: 2012-11-06 09:08:30
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