Attachment Exhibit A

This document pretains to SES-MOD-20111016-01221 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2011101601221_921348

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for TDS Telecom Madison, Wisconsin Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 August 10, 2011

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 08/10/2011 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 08/10/2011 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 08/10/2011 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 June 8, 2011. Company AT&T CORP Frequency Coordination and Interference Analysis Report 08/10/2011 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 08/10/2011 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 08/10/2011 Job Number: 110608COMSJC01 Administrative Information Status ENGINEER PROPOSAL Call Sign Licensee Code TDSTL Licensee Name TDS Telecom Site Information MADISON, WISCONSIN Venue Name Latitude (NAD 83) 43° 2' 51.9" N Longitude (NAD 83) 89° 29' 33.4" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 313.03 m / 1027.0 ft Link Information Satellite Type Geostationary Mode RO - Receive-Only Modulation Analog and Digital Satellite Arc 60° W to 143° West Longitude Azimuth Range 140.4° to 243.2° Corresponding Elevation Angles 32.1° / 17.5° Antenna Centerline (AGL) 3.05 m / 10.0 ft Antenna Information Receive Manufacturer ViaSat Model 4.5 Meter Gain / Diameter 44.0 dBi / 4.5 m 3-dB / 15-dB Beamwidth 1.10° / 2.10° 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) 36M0F8W / 3700.0 - 4200.0 36M0G7W / 3700.0 - 4200.0 Max Great Circle Coordination Distance 329.7 km / 204.9 mi Precipitation Scatter Contour Radius 510.7 km / 317.3 mi Frequency Coordination and Interference Analysis Report 08/10/2011 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 MADISON, WI Licensee Name TDS Telecom Latitude (NAD 83) 43° 2' 51.9" N Longitude (NAD 83) 89° 29' 33.4" W Ground Elevation (AMSL) 313.03 m / 1027.0 ft Antenna Centerline (AGL) 3.05 m / 10.0 ft Antenna Model ViaSat 4.5 Meter 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 0.43 115.53 -10.00 257.71 5 0.73 120.30 -10.00 235.24 10 0.83 123.59 -10.00 229.35 15 1.16 119.74 -10.00 215.25 20 1.52 115.78 -10.00 205.19 25 1.66 111.66 -10.00 203.58 30 1.41 107.40 -10.00 208.17 35 1.45 103.16 -10.00 207.03 40 1.39 98.89 -10.00 208.55 45 1.18 94.59 -10.00 214.83 50 0.93 90.31 -10.00 223.82 55 0.78 86.04 -10.00 232.43 60 0.70 81.78 -10.00 237.23 65 0.58 77.56 -10.00 244.72 70 0.56 73.36 -10.00 245.93 75 0.95 69.11 -10.00 223.23 80 0.82 65.01 -10.00 230.38 85 0.91 60.92 -10.00 225.08 90 0.72 57.02 -10.00 236.31 95 0.00 53.49 -10.00 285.28 100 0.31 49.65 -10.00 271.07 105 0.55 46.00 -9.57 249.14 110 0.85 42.49 -8.71 235.37 115 1.09 39.28 -7.85 228.78 120 1.40 36.31 -7.00 223.16 125 1.27 34.15 -6.33 231.23 130 1.22 32.45 -5.78 236.04 135 0.32 32.23 -5.71 298.95 140 0.35 31.80 -5.56 295.84 145 0.30 32.15 -5.68 301.20 150 0.41 33.02 -5.97 285.32 155 0.49 34.56 -6.46 273.23 160 0.63 36.25 -6.98 259.18 165 0.65 37.72 -7.41 255.66 170 0.79 38.66 -7.68 244.96 175 0.73 39.38 -7.88 247.55 180 0.52 39.82 -8.00 260.54 Frequency Coordination and Interference Analysis Report 08/10/2011 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 MADISON, WI Licensee Name TDS Telecom Latitude (NAD 83) 43° 2' 51.9" N Longitude (NAD 83) 89° 29' 33.4" W Ground Elevation (AMSL) 313.03 m / 1027.0 ft Antenna Centerline (AGL) 3.05 m / 10.0 ft Antenna Model ViaSat 4.5 Meter 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) 185 0.53 39.58 -7.94 260.52 190 0.59 38.85 -7.74 257.15 195 0.48 37.88 -7.46 268.04 200 0.73 36.16 -6.96 252.94 205 0.92 34.17 -6.34 245.09 210 0.94 32.01 -5.63 248.14 215 0.83 29.68 -4.81 260.09 220 0.89 26.97 -3.77 262.82 225 0.24 24.62 -2.78 329.74 230 0.44 21.43 -1.27 315.66 235 0.69 18.62 0.25 305.21 240 0.65 17.11 1.17 315.73 245 1.00 16.56 1.52 293.23 250 1.35 17.46 0.95 275.36 255 1.35 19.88 -0.46 265.13 260 1.19 23.22 -2.15 259.49 265 1.18 26.97 -3.77 249.56 270 1.14 31.06 -5.31 241.56 275 1.21 35.32 -6.70 231.03 280 1.11 39.79 -7.99 227.28 285 1.07 44.34 -9.17 222.47 290 1.15 48.92 -10.00 215.62 295 1.11 53.60 -10.00 216.87 300 1.09 58.30 -10.00 217.60 305 1.12 63.03 -10.00 216.56 310 0.99 67.80 -10.00 221.07 315 0.84 72.58 -10.00 228.88 320 0.70 77.37 -10.00 237.53 325 0.49 82.15 -10.00 250.88 330 0.41 86.94 -10.00 259.95 335 0.27 91.71 -10.00 276.32 340 0.34 96.49 -10.00 268.34 345 0.30 101.26 -10.00 272.68 350 0.25 106.02 -10.00 279.10 355 0.66 110.82 -10.00 239.87 Frequency Coordination and Interference Analysis Report 08/10/2011 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: August 10, 2011 Frequency Coordination and Interference Analysis Report 08/10/2011 Page 10 of 10


Document Created: 2019-04-23 03:42:52
Document Modified: 2019-04-23 03:42:52
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC