Attachment Frequency Coordinati

This document pretains to SES-REG-20180531-01045 for Earth Station Registration on a Satellite Earth Station filing.

IBFS_SESREG2018053101045_1404342

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for KSBJ Educational Foundation, Inc. BRENHAM, TX Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 May 25, 2018

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 05/25/2018 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 05/25/2018 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 05/25/2018 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 05/25/2018. Company AT&T Corp. Frequency Coordination and Interference Analysis Report 05/25/2018 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 05/25/2018 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 05/25/2018 Job Number: 180525COMSTC04 Administrative Information Licensee Code KSBJED Licensee Name KSBJ Educational Foundation, Inc. Site Information BRENHAM, TX Venue Name KSBJ Latitude (NAD 83) 30° 3' 17.0" N Longitude (NAD 83) 96° 30' 26.0" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 118.25 m / 388.0 ft Link Information Satellite Type Geostationary Mode RO - Receive-Only Modulation Digital Satellite Arc 60° W to 143° West Longitude Azimuth Range 124.1° to 244.6° Corresponding Elevation Angles 37.2° / 29.0° Antenna Centerline (AGL) 2.74 m / 9.0 ft Antenna Information Receive - P40381 Manufacturer PRODELIN CORPORATION Model 1380 Gain / Diameter 42.1 dBi / 3.8 m 3-dB / 15-dB Beamwidth 1.40° / 2.80° 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 Max Great Circle Coordination Distance 323.3 km / 200.9 mi Precipitation Scatter Contour Radius 490.3 km / 304.6 mi Frequency Coordination and Interference Analysis Report 05/25/2018 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 BRENHAM, TX Licensee Name KSBJ Educational Foundation, Inc. Latitude (NAD 83) 30° 3' 17.0" N Longitude (NAD 83) 96° 30' 26.0" W Ground Elevation (AMSL) 118.25 m / 388.0 ft Antenna Centerline (AGL) 2.74 m / 9.0 ft Antenna Model PRODELIN CORPORATION 1380 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 0.00 112.06 -9.90 285.92 5 0.00 112.79 -9.90 285.92 10 0.00 108.98 -9.90 285.92 15 0.00 105.11 -9.90 285.92 20 0.00 101.18 -9.90 285.92 25 0.00 97.23 -9.90 285.92 30 0.00 93.26 -9.90 285.92 35 0.00 89.27 -9.90 285.92 40 0.00 85.29 -9.90 285.92 45 0.00 81.32 -9.90 285.92 50 0.00 77.38 -9.90 285.92 55 0.00 73.47 -9.90 285.92 60 0.00 69.62 -9.90 285.92 65 0.00 65.83 -9.90 285.92 70 0.00 62.13 -9.90 285.92 75 0.00 58.54 -9.90 285.92 80 0.00 55.08 -9.90 285.92 85 0.00 51.79 -9.90 285.92 90 0.00 48.70 -9.64 287.58 95 0.00 45.86 -9.07 291.25 100 0.00 43.32 -8.56 294.58 105 0.00 41.14 -8.13 297.47 110 0.00 39.38 -7.78 299.82 115 0.00 38.10 -7.52 301.54 120 0.00 37.35 -7.37 302.55 125 0.00 37.17 -7.33 302.80 130 0.00 37.56 -7.41 302.27 135 0.00 38.51 -7.60 300.99 140 0.00 39.97 -7.89 299.03 145 0.00 41.89 -8.28 296.47 150 0.00 44.21 -8.74 293.41 155 0.00 46.87 -9.27 289.95 160 0.00 49.57 -9.81 286.47 165 0.00 51.82 -9.90 285.92 170 0.00 53.53 -9.90 285.92 175 0.00 54.60 -9.90 285.92 180 0.00 54.97 -9.90 285.92 185 0.00 54.60 -9.90 285.92 Frequency Coordination and Interference Analysis Report 05/25/2018 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 BRENHAM, TX Licensee Name KSBJ Educational Foundation, Inc. Latitude (NAD 83) 30° 3' 17.0" N Longitude (NAD 83) 96° 30' 26.0" W Ground Elevation (AMSL) 118.25 m / 388.0 ft Antenna Centerline (AGL) 2.74 m / 9.0 ft Antenna Model PRODELIN CORPORATION 1380 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 53.53 -9.90 285.92 195 0.00 51.82 -9.90 285.92 200 0.00 49.57 -9.81 286.47 205 0.00 46.86 -9.27 289.95 210 0.00 43.79 -8.66 293.96 215 0.00 40.46 -7.99 298.38 220 0.00 37.29 -7.36 302.65 225 0.00 34.48 -6.69 307.19 230 0.00 32.14 -5.76 314.32 235 0.00 30.38 -5.05 319.30 240 0.00 29.30 -4.62 322.39 245 0.00 28.98 -4.49 323.32 250 0.00 29.43 -4.67 322.01 255 0.00 30.64 -5.16 318.58 260 0.00 32.51 -5.90 313.30 265 0.00 34.93 -6.87 305.95 270 0.00 37.81 -7.46 301.94 275 0.00 41.03 -8.11 297.61 280 0.00 44.53 -8.81 292.99 285 0.00 48.24 -9.55 288.17 290 0.00 52.12 -9.90 285.92 295 0.00 56.13 -9.90 285.92 300 0.00 60.24 -9.90 285.92 305 0.22 64.36 -9.90 283.54 310 0.43 68.57 -9.90 257.78 315 0.69 72.84 -9.90 238.66 320 0.78 77.19 -9.90 232.88 325 0.62 81.59 -9.90 242.91 330 0.41 85.99 -9.90 261.02 335 0.26 90.38 -9.90 278.33 340 0.33 94.76 -9.90 269.76 345 0.35 99.14 -9.90 267.91 350 0.00 103.46 -9.90 285.92 355 0.00 107.78 -9.90 285.92 Frequency Coordination and Interference Analysis Report 05/25/2018 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: May 25, 2018 Frequency Coordination and Interference Analysis Report 05/25/2018 Page 10 of 10


Document Created: 2018-05-25 12:22:37
Document Modified: 2018-05-25 12:22:37
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