Attachment WestJeffersonROFinal

This document pretains to SES-REG-20071129-01634 for Earth Station Registration on a Satellite Earth Station filing.

IBFS_SESREG2007112901634_607360

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for SkyLine Telephone Membership Corporation SkyBest Communications West Jefferson, Nc Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 November 28, 2007

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 11/28/2007 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 11/28/2007 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 MCI Communication Services, Inc. No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 11/28/2007 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. Coordination data for this earth station was sent to the below listed carriers with a letter dated 11/26/2007. Company AT&T COMMUNICATIONS OF VIRGINIA INC MCI Communication Services, Inc. Frequency Coordination and Interference Analysis Report 11/28/2007 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 11/28/2007 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 11/28/2007 Job Number: 071126COMSTC04 Administrative Information Licensee Name SkyLine Telephone Membership Corporation SkyBest Communications Site Information WEST JEFFERSON, NC Latitude (NAD 83) 36° 24' 53.3" N Longitude (NAD 83) 81° 29' 52.4" W Climate Zone A Rain Zone 1 Ground Elevation (AMSL) 932.4 m / 3059.1 ft Link Information Satellite Type Geostationary Mode RO - Receive-Only Modulation Analog and Digital Satellite Arc 60° W to 143° West Longitude Azimuth Range 146.4° to 252.1° Corresponding Elevation Angles 42.0° / 14.1° Antenna Centerline (AGL) 3.66 m / 12.0 ft Antenna Information Receive - T40501 Manufacturer ANTENNA TECH CORP Model SIMULSAT 5M Gain / Diameter 44.0 dBi / 5.0 m 3-dB / 15-dB Beamwidth 0.80° / 2.20° 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) 36M0G7W / 3700.0 - 4200.0 36M0F3F / 3700.0 - 4200.0 Max Great Circle Coordination Distance 366.4 km / 227.6 mi Precipitation Scatter Contour Radius 603.0 km / 374.7 mi Frequency Coordination and Interference Analysis Report 11/28/2007 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 WEST JEFFERSON, NC Latitude (NAD 83) 36° 24' 53.3" N Longitude (NAD 83) 81° 29' 52.4" W Ground Elevation (AMSL) 932.4 m / 3059.1 ft Antenna Centerline (AGL) 3.66 m / 12.0 ft Antenna Model ANTENNA TECH CORP SIMULSAT 5M 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 2.86 107.51 -1.02 217.35 5 4.42 112.52 -1.11 188.91 10 5.16 117.49 -1.11 177.34 15 5.10 121.94 -1.08 178.32 20 4.80 118.22 -1.05 182.95 25 4.63 114.48 -1.06 185.71 30 5.06 110.84 -1.01 179.14 35 4.45 106.84 -1.17 188.08 40 2.86 102.67 -1.08 217.04 45 1.20 98.63 -1.06 266.66 50 0.82 94.84 -1.14 285.67 55 2.50 91.11 -1.06 225.60 60 1.94 87.28 -1.04 240.42 65 0.46 83.61 -1.24 313.31 70 0.38 79.91 -1.08 324.30 75 0.23 76.27 -1.05 345.04 80 0.00 72.73 -1.14 347.95 85 1.02 68.85 -1.07 273.55 90 2.02 64.95 -1.16 237.30 95 1.95 61.52 -1.03 240.39 100 3.90 57.18 -1.11 197.79 105 5.84 52.77 -1.02 169.38 110 7.86 48.27 -1.17 140.96 115 7.72 45.19 -1.04 143.20 120 6.43 43.28 -0.31 163.75 125 4.71 42.25 0.10 190.79 130 3.54 41.35 0.46 210.64 135 1.94 41.43 0.43 250.32 140 2.17 40.29 0.88 246.36 145 1.89 40.17 0.93 255.46 150 2.02 40.15 0.94 251.28 155 3.18 39.64 1.07 222.08 160 3.69 40.32 0.87 209.85 165 3.34 42.19 0.12 213.12 170 3.13 43.62 -0.45 214.39 175 2.70 44.79 -0.92 221.57 180 2.10 45.65 -1.13 235.25 185 2.82 44.67 -0.87 219.01 Frequency Coordination and Interference Analysis Report 11/28/2007 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 WEST JEFFERSON, NC Latitude (NAD 83) 36° 24' 53.3" N Longitude (NAD 83) 81° 29' 52.4" W Ground Elevation (AMSL) 932.4 m / 3059.1 ft Antenna Centerline (AGL) 3.66 m / 12.0 ft Antenna Model ANTENNA TECH CORP SIMULSAT 5M 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 3.30 43.46 -0.38 211.14 195 4.03 41.56 0.38 203.12 200 4.29 39.67 1.07 202.62 205 5.52 36.57 1.69 189.09 210 7.53 32.54 3.48 173.35 215 9.41 28.40 5.64 163.18 220 10.79 24.48 7.21 160.06 225 13.18 19.62 9.23 153.29 230 14.30 15.61 11.64 158.69 235 15.80 11.18 13.82 160.41 240 16.15 7.49 15.51 170.53 245 15.40 4.46 23.16 221.12 250 15.15 0.94 39.39 366.38 255 15.16 3.04 29.84 274.84 260 15.04 7.92 15.08 176.64 265 14.74 12.88 13.00 163.68 270 14.19 17.87 10.28 151.53 275 14.20 22.87 7.85 137.87 280 13.93 27.87 5.85 130.55 285 12.98 32.88 3.27 123.91 290 12.33 37.90 1.42 119.34 295 10.91 42.96 -0.19 121.43 300 9.14 48.06 -1.14 130.77 305 6.93 53.21 -1.26 151.72 310 5.25 58.30 -1.14 176.03 315 4.66 63.27 -1.15 184.65 320 2.83 68.32 -1.07 217.67 325 1.40 73.30 -1.07 259.18 330 1.00 78.19 -1.17 273.61 335 0.33 83.07 -1.01 332.07 340 1.29 87.92 -1.07 263.24 345 1.51 92.80 -1.08 255.06 350 1.71 97.68 -1.13 247.81 355 2.75 102.61 -1.07 219.66 Frequency Coordination and Interference Analysis Report 11/28/2007 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. Timothy O. Crutcher Frequency Planner COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 DATED: November 28, 2007 Frequency Coordination and Interference Analysis Report 11/28/2007 Page 10 of 10


Document Created: 2007-11-28 10:01:36
Document Modified: 2007-11-28 10:01:36
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