Attachment Freq Coord Report

This document pretains to SES-MOD-20101007-01272 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2010100701272_844454

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for ALASCOM, INC. VALDEZ, AK Satellite Earth Station Call Sign: KB36 Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 October 05, 2010

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 10/05/2010 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 10/05/2010 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. No carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 10/05/2010 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. Company ALASCOM, INC. COPPER VALLEY TELEPHONE COOPERATIVE INC Copper Valley Wireless Inc State of Alaska Frequency Coordination and Interference Analysis Report 10/05/2010 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 10/05/2010 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 10/05/2010 Job Number: 101005COMSTC02 Administrative Information Call Sign KB36 Licensee Code P1040 Licensee Name ALASCOM, INC. Site Information VALDEZ, AK Latitude (NAD 83) 61° 7' 57.9" N Longitude (NAD 83) 146° 20' 6.7" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 9.1 m / 29.9 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 86° W to 150° West Longitude Azimuth Range 116.5° to 184.2° Corresponding Elevation Angles 5.2° / 20.7° Antenna Centerline (AGL) 3.0 m / 9.8 ft Antenna Information Receive Transmit Manufacturer Andrew Andrew Model ESA45P-1 ESA45P-1 Gain / Diameter 43.0 dBi / 4.5 m 47.0 dBi / 4.5 m 3-dB / 15-dB Beamwidth 0.60° / 1.00° 0.50° / 1.00° 9K60G7W - 36M0G7W Max Available RF Power (dBW/4 kHz) -17.8 -24.05 (dBW/MHz) 6.2 0.05 Maximum EIRP (dBW/4 kHz) 29.2 22.95 (dBW/MHz) 33.0 46.95 (dBW) 33.0 62.49 Interference Objectives: Long Term -152.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -142.0 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) 9K60G7W - 36M0G7W / 3700.0 - 4200.0 9K60G7W - 36M0G7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 526.7 km / 327.3 mi 219.5 km / 136.4 mi Precipitation Scatter Contour Radius 610.3 km / 379.2 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 10/05/2010 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 VALDEZ, AK Licensee Name ALASCOM, INC. Latitude (NAD 83) 61° 7' 57.9" N Longitude (NAD 83) 146° 20' 6.7" W Ground Elevation (AMSL) 9.1 m / 29.9 ft Antenna Centerline (AGL) 3.0 m / 9.8 ft Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -152.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -142.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -17.8 (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 23.28 115.10 -10.00 100.00 -10.00 100.00 5 24.34 110.26 -10.00 100.00 -10.00 100.00 10 23.23 105.68 -10.00 100.00 -10.00 100.00 15 22.73 100.97 -10.00 100.00 -10.00 100.00 20 22.40 96.22 -10.00 100.00 -10.00 100.00 25 22.33 91.45 -10.00 100.00 -10.00 100.00 30 19.95 86.63 -10.00 100.00 -10.00 100.00 35 18.89 81.76 -10.00 100.00 -10.00 100.00 40 18.25 76.87 -10.00 100.00 -10.00 100.00 45 17.11 71.93 -10.00 100.00 -10.00 100.00 50 16.15 66.97 -10.00 100.00 -10.00 100.00 55 14.10 61.89 -10.00 100.00 -10.00 100.00 60 13.48 56.91 -10.00 100.00 -10.00 100.00 65 12.85 51.92 -10.00 100.00 -10.00 100.00 70 10.01 46.71 -9.73 100.00 -9.73 100.00 75 7.07 41.55 -8.46 103.62 -8.46 100.00 80 3.50 36.55 -7.07 153.15 -7.07 100.00 85 0.36 31.84 -5.57 268.37 -5.57 121.52 90 0.27 26.93 -3.76 291.43 -3.76 134.00 95 0.00 22.09 -1.61 315.38 -1.61 144.99 100 0.00 17.28 1.06 334.58 1.06 153.92 105 0.00 12.60 4.49 360.36 4.49 168.28 110 0.00 8.30 9.02 395.84 9.02 185.84 115 0.00 5.38 13.74 526.75 13.74 219.47 120 0.00 6.15 12.27 474.05 12.27 199.80 125 0.00 8.23 9.11 419.43 9.11 186.19 130 0.00 10.18 6.80 384.48 6.80 177.27 135 0.00 12.03 5.00 364.28 5.00 170.25 140 0.40 13.36 3.86 328.90 3.86 143.79 145 1.15 14.20 3.20 270.24 3.20 108.04 150 2.92 13.86 3.45 218.59 3.45 100.00 155 4.83 13.19 4.00 188.33 4.00 100.00 160 2.62 16.32 1.68 215.77 1.68 100.00 165 1.61 18.10 0.56 236.71 0.56 100.00 170 2.66 17.62 0.85 210.40 0.85 100.00 175 4.07 16.55 1.53 187.28 1.53 100.00 180 4.78 15.96 1.92 177.69 1.92 100.00 185 3.16 17.53 0.91 202.72 0.91 100.00 Frequency Coordination and Interference Analysis Report 10/05/2010 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 VALDEZ, AK Licensee Name ALASCOM, INC. Latitude (NAD 83) 61° 7' 57.9" N Longitude (NAD 83) 146° 20' 6.7" W Ground Elevation (AMSL) 9.1 m / 29.9 ft Antenna Centerline (AGL) 3.0 m / 9.8 ft Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -152.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -142.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -17.8 (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) 190 3.26 18.32 0.42 198.15 0.42 100.00 195 6.26 17.95 0.65 149.51 0.65 100.00 200 5.65 21.68 -1.40 146.71 -1.40 100.00 205 3.90 26.50 -3.58 161.71 -3.58 100.00 210 3.39 30.73 -5.19 164.79 -5.19 100.00 215 2.26 35.43 -6.73 185.00 -6.73 100.00 220 3.54 39.20 -7.83 148.57 -7.83 100.00 225 4.23 43.46 -8.95 133.23 -8.95 100.00 230 4.33 48.03 -10.00 127.72 -10.00 100.00 235 4.15 52.72 -10.00 130.17 -10.00 100.00 240 4.15 57.41 -10.00 130.17 -10.00 100.00 245 3.91 62.17 -10.00 133.79 -10.00 100.00 250 4.03 66.89 -10.00 131.82 -10.00 100.00 255 4.03 71.65 -10.00 131.82 -10.00 100.00 260 4.19 76.41 -10.00 129.63 -10.00 100.00 265 4.19 81.20 -10.00 129.63 -10.00 100.00 270 4.19 85.99 -10.00 129.62 -10.00 100.00 275 4.07 90.79 -10.00 131.27 -10.00 100.00 280 7.23 95.66 -10.00 100.00 -10.00 100.00 285 9.89 100.63 -10.00 100.00 -10.00 100.00 290 11.40 105.61 -10.00 100.00 -10.00 100.00 295 12.89 110.62 -10.00 100.00 -10.00 100.00 300 13.79 115.62 -10.00 100.00 -10.00 100.00 305 15.26 120.67 -10.00 100.00 -10.00 100.00 310 15.87 125.68 -10.00 100.00 -10.00 100.00 315 16.18 130.67 -10.00 100.00 -10.00 100.00 320 14.99 135.53 -10.00 100.00 -10.00 100.00 325 15.55 140.54 -10.00 100.00 -10.00 100.00 330 16.49 144.86 -10.00 100.00 -10.00 100.00 335 17.11 139.98 -10.00 100.00 -10.00 100.00 340 17.54 135.12 -10.00 100.00 -10.00 100.00 345 19.19 130.02 -10.00 100.00 -10.00 100.00 350 19.76 125.15 -10.00 100.00 -10.00 100.00 355 21.40 120.12 -10.00 100.00 -10.00 100.00 Frequency Coordination and Interference Analysis Report 10/05/2010 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: October 05, 2010 Frequency Coordination and Interference Analysis Report 10/05/2010 Page 10 of 10


Document Created: 2010-10-05 10:14:32
Document Modified: 2010-10-05 10:14:32
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