Attachment E050380

This document pretains to SES-LIC-20051210-01716 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005121001716_472419

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for Shell Offshore, Inc. Shell Mars Flotila (Mississippi Canyon 807) , Gulf of Mexico Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 December 9, 2005

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 12/09/2005 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 12/09/2005 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 transmit-receive earth station. Company None No carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 12/09/2005 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. Expedited coordination data for this earth station was e-mailed and/or faxed to the below listed carriers with a letter dated November 14, 2005. A minor revision was forwarded November 29, 2005 Company AT&T COMM. OF THE SOUTH CENTRAL STATES BELLSOUTH TELECOMMUNICATIONS, INC. MCI Network Services, Inc. Stratos Offshore Services Company Frequency Coordination and Interference Analysis Report 12/09/2005 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 12/09/2005 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 12/08/2005 Job Number: 051129COMSJC08 Administrative Information Status ENGINEER PROPOSAL Call Sign Licensee Code SHLOFF Licensee Name Shell Offshore, Inc. Site Information SHELL MARS FLOTILA (MISSISSIPPI CANYON 807), GULF of MEXICO Venue Name OIL PLATFORM Latitude (NAD 83) 28° 10' 10.9" N Longitude (NAD 83) 89° 13' 22.1" W Climate Zone B Rain Zone 1 Ground Elevation (AMSL) 0.0 m / 0.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 43° W to 140° West Longitude Azimuth Range 114.3° to 248.9° Corresponding Elevation Angles 30.1° / 26.1° Antenna Centerline (AGL) 31.7 m / 104.0 ft Antenna Information Receive Transmit Manufacturer Sea Tel Sea Tel Model 2.4 Meter 2.4 Meter Gain / Diameter 38.5 dBi / 2.4 m 41.7 dBi / 2.4 m 3-dB / 15-dB Beamwidth 2.04° / 3.83° 1.42° / 2.65° 1M38G7W to 1M50G7W Max Available RF Power (dBW/4 kHz) -17.7 -17.7 (dBW/MHz) 6.3 6.3 Maximum EIRP (dBW/4 kHz) 24.0 24.0 (dBW/MHz) 48.0 48.0 (dBW) 49.4 49.7 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) 1M38G7W - 1M50G7W / 3700.0 - 4200.0 1M38G7W - 1M50G7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 502.1 km / 312.0 mi 157.9 km / 98.1 mi Precipitation Scatter Contour Radius 566.8 km / 352.1 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 12/09/2005 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 SHELL MARS FLOTILA (MC 807), GM Licensee Name Shell Offshore, Inc. Latitude (NAD 83) 28° 10' 10.9" N Longitude (NAD 83) 89° 13' 22.1" W Ground Elevation (AMSL) 0.0 m / 0.0 ft Antenna Centerline (AGL) 31.7 m / 104.0 ft Antenna Model Sea Tel 2.4 Meter 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 -17.7 (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 0.00 108.84 -10.00 412.20 -10.00 132.57 5 0.00 106.66 -10.00 412.20 -10.00 132.57 10 0.00 102.38 -10.00 412.20 -10.00 132.57 15 0.00 98.08 -10.00 412.20 -10.00 132.57 20 0.00 93.76 -10.00 412.20 -10.00 132.57 25 0.00 89.43 -10.00 412.20 -10.00 132.57 30 0.00 85.11 -10.00 412.20 -10.00 132.57 35 0.00 80.79 -10.00 412.20 -10.00 132.57 40 0.00 76.49 -10.00 412.20 -10.00 132.57 45 0.00 72.22 -10.00 412.20 -10.00 132.57 50 0.00 67.99 -10.00 412.20 -10.00 132.57 55 0.00 63.81 -10.00 412.20 -10.00 132.57 60 0.00 59.70 -10.00 412.20 -10.00 132.57 65 0.00 55.67 -10.00 412.20 -10.00 132.57 70 0.00 51.76 -10.00 412.20 -10.00 132.57 75 0.00 47.98 -10.00 412.20 -10.00 132.57 80 0.00 44.39 -9.18 422.48 -9.18 135.38 85 0.00 41.02 -8.33 433.52 -8.33 138.42 90 0.00 37.95 -7.48 444.71 -7.48 141.53 95 0.00 35.25 -6.68 455.58 -6.68 144.58 100 0.00 33.02 -5.97 464.82 -5.97 147.37 105 0.00 31.35 -5.41 472.77 -5.41 149.50 110 0.00 30.35 -5.05 477.85 -5.05 150.95 115 0.00 30.07 -4.95 479.28 -4.95 151.36 120 0.00 30.54 -5.12 476.84 -5.12 150.66 125 0.00 31.73 -5.54 470.92 -5.54 148.97 130 0.00 33.55 -6.14 462.99 -6.14 146.67 135 0.00 35.92 -6.88 452.79 -6.88 143.80 140 0.00 38.73 -7.70 441.77 -7.70 140.71 145 0.00 41.88 -8.55 430.59 -8.55 137.61 150 0.00 45.28 -9.40 419.74 -9.40 134.63 155 0.00 48.50 -10.00 412.20 -10.00 132.57 160 0.00 51.35 -10.00 412.20 -10.00 132.57 165 0.00 53.75 -10.00 412.20 -10.00 132.57 170 0.00 55.58 -10.00 412.20 -10.00 132.57 175 0.00 56.73 -10.00 412.20 -10.00 132.57 180 0.00 57.12 -10.00 412.20 -10.00 132.57 Frequency Coordination and Interference Analysis Report 12/09/2005 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 SHELL MARS FLOTILA (MC 807), GM Licensee Name Shell Offshore, Inc. Latitude (NAD 83) 28° 10' 10.9" N Longitude (NAD 83) 89° 13' 22.1" W Ground Elevation (AMSL) 0.0 m / 0.0 ft Antenna Centerline (AGL) 31.7 m / 104.0 ft Antenna Model Sea Tel 2.4 Meter 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 -17.7 (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 56.73 -10.00 412.20 -10.00 132.57 190 0.00 55.58 -10.00 412.20 -10.00 132.57 195 0.00 53.75 -10.00 412.20 -10.00 132.57 200 0.00 51.35 -10.00 412.20 -10.00 132.57 205 0.00 48.50 -10.00 412.20 -10.00 132.57 210 0.00 45.28 -9.40 419.73 -9.40 134.63 215 0.00 41.79 -8.53 430.91 -8.53 137.70 220 0.00 38.17 -7.54 443.88 -7.54 141.30 225 0.00 34.81 -6.54 457.47 -6.54 145.11 230 0.00 31.82 -5.57 470.46 -5.57 148.84 235 0.00 29.33 -4.68 483.23 -4.68 152.48 240 0.00 27.46 -3.97 493.79 -3.97 155.51 245 0.00 26.35 -3.52 500.52 -3.52 157.45 250 0.00 26.09 -3.41 502.10 -3.41 157.91 255 0.00 26.72 -3.67 498.19 -3.67 156.78 260 0.00 28.17 -4.25 489.62 -4.25 154.31 265 0.00 30.33 -5.05 477.92 -5.05 150.97 270 0.00 33.05 -5.98 464.65 -5.98 147.32 275 0.00 36.21 -6.97 451.58 -6.97 143.46 280 0.00 39.71 -7.97 438.18 -7.97 139.71 285 0.00 43.45 -8.95 425.45 -8.95 136.19 290 0.00 47.38 -9.89 413.57 -9.89 132.95 295 0.00 51.46 -10.00 412.20 -10.00 132.57 300 0.00 55.64 -10.00 412.20 -10.00 132.57 305 0.00 59.91 -10.00 412.20 -10.00 132.57 310 0.00 64.25 -10.00 412.20 -10.00 132.57 315 0.00 68.64 -10.00 412.20 -10.00 132.57 320 0.00 73.06 -10.00 412.20 -10.00 132.57 325 0.00 77.52 -10.00 412.20 -10.00 132.57 330 0.00 81.99 -10.00 412.20 -10.00 132.57 335 0.00 86.48 -10.00 412.20 -10.00 132.57 340 0.00 90.97 -10.00 412.20 -10.00 132.57 345 0.00 95.46 -10.00 412.20 -10.00 132.57 350 0.00 99.94 -10.00 412.20 -10.00 132.57 355 0.00 104.40 -10.00 412.20 -10.00 132.57 Frequency Coordination and Interference Analysis Report 12/09/2005 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 Principal Frequency Planner COMSEARCH 19700 Janelia Farm Blvd. Ashburn, Va 20147 DATED: December 9, 2005 Frequency Coordination and Interference Analysis Report 12/09/2005 Page 10 of 10


Document Created: 2005-12-15 16:02:42
Document Modified: 2005-12-15 16:02:42
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