Attachment E000361

This document pretains to SES-MOD-20041103-01638 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2004110301638_407959

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for SKYPORT INTERNATIONAL, INC. HOUSTON, TEXAS Satellite Earth Station Prepared By: COMSEARCH 19700 JANELIA FARM BOULEVARD ASHBURN, VIRGINIA 20147 NOVEMBER 29, 2004

TABLE OF CONTENTS 1. CONCLUSIONS 3 2. SUMMARY OF RESULTS 4 3. SUPPLEMENTAL SHOWING 5 4. EARTH STATION COORDINATION DATA 6 5. CERTIFICATION 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, based upon the restrictions noted in the Summary of Results (Section 2).

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 most cases. 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 and frequency separation are considered on the interfering paths, sufficient losses exist to negate harmful interference from occurring with the proposed transmit-receive earth station. Further, the transmit band will be limited to frequencies 5970.5 to 6078.2 MHz, 6108.7 to 6182.0 MHz, 6212.5 to 6330.2 MHz, and 6360.8 to 6425.0 MHz. Company NONE No carriers reported potential interference cases. 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. Expedited coordination data for this earth station was e-mailed and/or faxed to the below listed carriers with a letter dated November 15, 2004. Company AT&T COMM. OF THE SOUTH CENTRAL STATES

Alda Gold Inc. American National Insurance Company Bell Atlantic Mobile Sys of Allentown CENTERPOINT ENERGY, INC Cable One, Inc. Cameron Telephone Company Central Telephone Company of Texas Cingular Wireless of Texas RSA #16 Ltd Corban Networks, Inc. Dobson Cellular Systems, Inc. EPEC COMMUNICATIONS CORPORATION GTE Mobilnet of South Texas LTD Partners GTE Mobilnet of Texas RSA #17 LTD Prtnsh HOUSTON NEWS CHANNEL, L.P. IWL COMMUNICATIONS, INC. LOWER COLORADO RIVER AUTHORITY MCI Worldcom Network Services, Inc. PATHNET, INC. - DEBTOR IN POSSESSION San Antonio MTA, L.P. Stratos Offshore Services Company Transcontinental Gas Pipeline Corp. Union Pacific Railroad Company VERESTAR, INC Verizon Southwest Inc. Verizon Wireless Texas, LLC 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. Date: 11/24/2004 Job Number: 041115COMSJC03 Administrative Information Status ENGINEER PROPOSAL Call Sign E000361 Licensee Code SKYINT Licensee Name SkyPort International, Inc. Site Information HOUSTON, TEXAS Venue Name Latitude (NAD 83) 29° 36' 35.5" N Longitude (NAD 83) 95° 10' 29.7" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 11.28 m / 37.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive

Modulation Digital Satellite Arc 21° W to 143° West Longitude Azimuth Range 98.0° to 245.9° Corresponding Elevation Angles 5.1° / 28.0° Antenna Centerline (AGL) 3.96 m / 13.0 ft Antenna Information Receive Transmit Manufacturer Vertex Corporation Vertex Corporation Model 6.1 KPC 6.1 KPC Gain / Diameter 46.3 dBi / 6.1 m 50.3 dBi / 6.1 m 3-dB / 15-dB Beamwidth 0.82° / 1.72° 0.56° / 1.06° Max Available RF Power (dBW/4 kHz) -15.0 (dBW/MHz) 9.0 Maximum EIRP (dBW/4 kHz) 35.3 (dBW/MHz) 59.3 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) 1M54G7W - 45M0G7W / 3700.0 - 4200.0 1M54G7W - 45M0G7W / 5970.5 - 6078.2 1M54G7W - 45M0G7W / 6108.7 - 6182.0 1M54G7W - 45M0G7W / 6212.5 - 6330.2 1M54G7W - 45M0G7W / 6360.8 - 6425.0 Max Great Circle Coordination Distance 509.7 km / 316.7 mi 214.1 km / 133.0 mi Precipitation Scatter Contour Radius 618.9 km / 384.5 mi 100.0 km / 62.1 mi Coordination Values HOUSTON, TX Licensee Name SkyPort International, Inc. Latitude (NAD 83) 29° 36' 35.5" N Longitude (NAD 83) 95° 10' 29.7" W Ground Elevation (AMSL) 11.28 m / 37.0 ft Antenna Centerline (AGL) 3.96 m / 13.0 ft Antenna Model Vertex Corporation 6.1 KPC 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 -15.0 (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 0.00 97.94 -10.00 285.28 -10.00 130.16 5 0.00 92.96 -10.00 285.28 -10.00 130.16 10 0.00 87.98 -10.00 285.28 -10.00 130.16 15 0.00 83.00 -10.00 285.28 -10.00 130.16

20 0.00 78.02 -10.00 285.28 -10.00 130.16 25 0.00 73.04 -10.00 285.28 -10.00 130.16 30 0.00 68.06 -10.00 285.28 -10.00 130.16 35 0.00 63.09 -10.00 285.28 -10.00 130.16 40 0.00 58.11 -10.00 285.28 -10.00 130.16 45 0.00 53.14 -10.00 285.28 -10.00 130.16 50 0.00 48.17 -10.00 285.28 -10.00 130.16 55 0.00 43.21 -8.89 292.44 -8.89 133.14 60 0.00 38.26 -7.57 301.22 -7.57 135.51 65 0.00 33.32 -6.07 311.54 -6.07 139.86 70 0.00 28.39 -4.33 324.47 -4.33 145.23 75 0.00 23.49 -2.27 339.47 -2.27 152.06 80 0.00 18.65 0.23 358.40 0.23 161.08 85 0.00 13.91 3.42 383.44 3.42 175.01 90 0.00 9.43 7.64 418.02 7.64 191.29 95 0.00 5.86 12.80 465.02 12.80 209.47 100 0.00 5.44 13.61 509.69 13.61 214.07 105 0.00 8.64 8.58 426.28 8.58 194.91 110 0.00 12.88 4.25 389.52 4.25 178.22 115 0.00 17.12 1.16 365.60 1.16 164.61 120 0.00 21.30 -1.21 347.43 -1.21 155.80 125 0.00 25.41 -3.13 333.20 -3.13 149.17 130 0.00 29.44 -4.72 321.65 -4.72 143.99 135 0.00 33.36 -6.08 311.43 -6.08 139.81 140 0.00 37.15 -7.25 303.38 -7.25 136.41 145 0.00 40.76 -8.26 296.62 -8.26 133.60 150 0.00 44.15 -9.12 290.93 -9.12 132.52 155 0.00 47.25 -9.86 286.17 -9.86 130.54 160 0.00 49.99 -10.00 285.28 -10.00 130.16 165 0.00 52.28 -10.00 285.28 -10.00 130.16 170 0.00 54.01 -10.00 285.28 -10.00 130.16 175 0.00 55.10 -10.00 285.28 -10.00 130.16 180 0.00 55.47 -10.00 285.28 -10.00 130.16 Coordination Values HOUSTON, TX Licensee Name SkyPort International, Inc. Latitude (NAD 83) 29° 36' 35.5" N Longitude (NAD 83) 95° 10' 29.7" W Ground Elevation (AMSL) 11.28 m / 37.0 ft Antenna Centerline (AGL) 3.96 m / 13.0 ft Antenna Model Vertex Corporation 6.1 KPC 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 -15.0 (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) 185 0.00 55.10 -10.00 285.28 -10.00 130.16 190 0.00 54.01 -10.00 285.28 -10.00 130.16 195 0.00 52.28 -10.00 285.28 -10.00 130.16

200 0.00 49.99 -10.00 285.28 -10.00 130.16 205 0.00 47.25 -9.86 286.18 -9.86 130.54 210 0.00 44.15 -9.12 290.92 -9.12 132.51 215 0.00 40.76 -8.26 296.62 -8.26 133.60 220 0.00 37.43 -7.33 302.82 -7.33 136.18 225 0.00 34.45 -6.43 309.01 -6.43 138.78 230 0.00 31.91 -5.60 315.45 -5.60 141.28 235 0.00 29.92 -4.90 320.40 -4.90 143.43 240 0.00 28.60 -4.41 323.89 -4.41 144.98 245 0.00 28.06 -4.20 325.40 -4.20 145.65 250 0.00 28.32 -4.30 324.67 -4.30 145.32 255 0.00 29.37 -4.70 321.83 -4.70 144.06 260 0.00 31.14 -5.33 317.33 -5.33 142.09 265 0.00 33.50 -6.12 311.13 -6.12 139.69 270 0.00 36.34 -7.01 305.02 -7.01 137.10 275 0.00 39.55 -7.93 298.80 -7.93 134.50 280 0.00 43.05 -8.85 292.70 -8.85 133.25 285 0.00 46.78 -9.75 286.86 -9.75 130.83 290 0.00 50.68 -10.00 285.28 -10.00 130.16 295 0.00 54.71 -10.00 285.28 -10.00 130.16 300 0.00 58.85 -10.00 285.28 -10.00 130.16 305 0.00 63.06 -10.00 285.28 -10.00 130.16 310 0.00 67.34 -10.00 285.28 -10.00 130.16 315 0.00 71.66 -10.00 285.28 -10.00 130.16 320 0.00 76.02 -10.00 285.28 -10.00 130.16 325 0.00 80.41 -10.00 285.28 -10.00 130.16 330 0.00 84.81 -10.00 285.28 -10.00 130.16 335 0.00 89.22 -10.00 285.28 -10.00 130.16 340 0.00 93.63 -10.00 285.28 -10.00 130.16 345 0.00 98.04 -10.00 285.28 -10.00 130.16 350 0.00 102.43 -10.00 285.28 -10.00 130.16 355 0.00 102.92 -10.00 285.28 -10.00 130.16 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 PRINCIPAL FREQUENCY PLANNER COMSEARCH 19700 JANELIA FARM BLVD. ASHBURN, VA 20147 DATED: NOVEMBER 29, 2004 Frequency Coordination and Interference Analysis Report 11/29/2004 Page 10 of 10 COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com


Document Created: 2004-12-02 13:59:24
Document Modified: 2004-12-02 13:59:24
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