Attachment 7.2m freq

This document pretains to SES-MOD-20030314-00345 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2003031400345_308590

EXHIBIT A Page 1 of 11 FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT PREPARED FOR BT AMERICAS INC. MARINA DEL REY, CALIFORNIA SATELLITE EARTH STATION PREPARED BY COMSEARCH 19700 JANELIA FARM BOULEVARD ASHBURN, VIRGINIA 20147 FEBRUARY 10, 2003

EXHIBIT A Page 2 of 11 TABLE OF CONTENTS 1. CONCLUSIONS 2. SUMMARY OF RESULTS 3. SUPPLEMENTAL SHOWING, RE: PART 25.203(C) 4. EARTH STATION COORDINATION DATA 5. CERTIFICATION

EXHIBIT A Page 3 of 11 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).

EXHIBIT A Page 4 of 11 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 WHICH 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 AND RECEIVE EARTH STATION. FURTHER, THE TRANSMIT SPECTRUM WILL BE LIMITED TO FREQUENCIES 5940.0 TO 6009.0 MHZ, 6060.0 TO 6152.0 MHZ, AND 6183.0 TO 6425.0 MHZ. COMPANY AT&T WIRELESS SERVICES OF FLA - SAN DIEGO ARCH WIRELESS LICENSE COMPANY, LLC LOS ANGELES SMSA LTD PARTNERSHIP SOUTHERN CALIFORNIA GAS COMPANY NO OTHER CARRIERS REPORTED POTENTIAL INTERFERENCE CASES.


EXHIBIT A Page 5 of 11 3. SUPPLEMENTAL SHOWING RE: PART 25.203(C) 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 FAXED TO THE BELOW LISTED CARRIERS WITH A LETTER DATED JANUARY 27, 2003. AB CELULLAR LA, LLC ARCH WIRELESS LICENSE CO., LLC AT&T WIRELESS SER OF FL - SOUTHERN CALIF AT&T WIRELESS SERVICES OF FL - San Diego CALIFORNIA, STATE OF CARITAS TELECOMMUNICATIONS CNG COMMUNICATIONS, INC. COAST COMMUNITY COLLEGE DISTRICT FRESNO MSA LIMITED PARTNERSHIP GLOBECAST NORTH AMERICA INCORPORATED GTE MOBILNET OF SANTA BARBARA LTD PARTNE KERN COUNTY CALIFORNIA KERN ED TELECOM CONSORTIUM LB Tower Company LLC LOS ANGELES CITY COMMUNICATIONS SERVICES LOS ANGELES COUNTY DEPT OF PUBLIC WORKS LOS ANGELES COUNTY FCC LICENSING SECTION LOS ANGELES SMSA LTD. PARTNERSHIP METROPOLITAN WATER DIST OF SO CALIFORNIA MICROWAVE SERVICE COMPANY MUT LICENSING INC NEXTEL OF CALIFORNIA INC ORANGE COUNTY GSA COMMUNICATIONS DIV OXNARD VENTURA SIMI LIMITED PARTNERSHIP PACIFIC BELL PASADENA REGION QWEST COMMUNICATIONS INTERNATIONAL INC. RIVERSIDE COUNTY OF RIVERSIDE TELEPORT CORPORATION SAN BERNARDINO COUNTY OF CALIFORNIA

EXHIBIT A Page 6 of 11 SAN DIEGO COUNTY SOUTHERN CALIFORNIA EDISON COMPANY SOUTHERN CALIFORNIA GAS COMPANY SOUTHWESTERN BELL MOBILE SYS LLC - CA NV TV MICROWAVES CO UNION PACIFIC RAILROAD COMPANY VERESTAR, INC VERIZON CALIFORNIA INC. VERIZON WIRELESS (VAW) LLC (CA) WINSTAR WIRELESS FIBER CORPORATION Western Technical Services

EXHIBIT A Page 7 of 11 4. EARTH STATION COORDINATION DATA THIS SECTION PRESENTS THE DATA PERTINENT TO FREQUENCY COORDINATION OF THE PROPOSED EARTH STATION WHICH WAS CIRCULATED TO ALL COMMON CARRIERS WITHIN ITS COOR- DINATION CONTOURS.

EXHIBIT A Page 8 of 11 SATELLITE EARTH STATION FREQUENCY COORDINATION DATA 01/24/2003 Company BT AMERICAS INC. Earth Station Name, State MARINA DEL REY, CA Call Sign E000622 Latitude (DMS) (NAD83) 33 58 55.0 N Longitude (DMS) (NAD83) 118 25 38.3 W Ground Elevation AMSL (Ft/m) 15.03 / 4.58 Antenna Centerline AGL (Ft/m) 49.67 / 15.14 Receive Antenna Type: VERTEX COMMUNICATIONS 7.2 KXC 4.0 GHz Gain (dBi) / Diameter (m) 47.8 / 7.2 3 dB / 15 dB Half Beamwidth 0.37 / 0.74 Transmit Antenna Type: VERTEX COMMUNICATIONS 7.2 KXC 6.0 GHz Gain (dBi) / Diameter (m) 51.2 / 7.2 3 dB / 15 dB Half Beamwidth 0.24 / 0.49 Operating Mode TRANSMIT AND RECEIVE Modulation ANALOG & DIGITAL Emission / Receive Band (MHz) 36M0F8W, 6M76G7W, 12M8G7W / 3700.0000 - 4200.0000 Emission / Transmit Band (MHz) 36M0F8W, 6M76G7W, 12M8G7W / 5940.0000 - 6009.0000 36M0F8W, 6M76G7W, 12M8G7W / 6060.0000 - 6152.0000 36M0F8W, 6M76G7W, 12M8G7W / 6183.0000 - 6425.0000 Max. Available RF Power (dBW)/4 kHz) -14.50 (dBW)/MHz) 9.50 Max. EIRP (dBW)/4 kHz) 36.70 (dBW)/MHz) 60.70 Max permissible Interference Power 4.0 GHz, 20% (dBW/1 MHz) -156.0 4.0 GHz, 0.0100% (dBW/1 MHz) -146.0 6.0 GHz, 20% (dBW/4 kHz) -154.0 6.0 GHz, 0.0025% (dBW/4 kHz) -131.0 Range of Satellite Arc (Geostationary) Degrees Longitude 50.0 W / 191.0 W Azimuth Range (Min/Max) 102.5 / 260.0 Corresponding Elevation Angles 9.2 / 5.7 Radio Climate B Rain Zone 4 Max Great Circle Coordination Distance (Mi/Km) 4.0 GHz 505.9 / 814.3 6.0 GHz 168.9 / 271.8 Precipitation Scatter Contour Radius (Mi/Km) 4.0 GHz 384.4 / 618.7 6.0 GHz 62.1 / 100.0

EXHIBIT A Page 9 of 11 Table of Earth Station Coordination Values 01/24/2003 Earth Station Name MARINA DEL REY CA Owner BT AMERICAS INC. Latitude (DMS) (NAD83) 33 58 55.0 N Longitude (DMS) (NAD83)118 25 38.3 W Ground Elevation (Ft/m) 15.03 / 4.58 AMSL Antenna Centerline (Ft/m) 49.67 / 15.14 AGL Antenna Model VERTEX COMMUNICATIONS 7.2 KXC Objectives: Receive -156.0 (dBW /1 MHz) Transmit -154.0 (dBW /4 kHz) TX Power -14.5 (dBW/4 kHz) Azimuth Horizon Antenna 4.0 GHz 6.0 GHz (Deg) Elevation Disc. Antenna Coordination Antenna Coordination Angle Angle Gain Distance Gain Distance (Deg) (Deg) (dBi) (Km) (dBi) (Km) 0 0.38 99.91 -10.00 354.8 -10.00 124.7 5 0.37 97.38 -10.00 355.7 -10.00 125.0 10 0.44 92.44 -10.00 338.4 -10.00 119.1 15 0.43 87.49 -10.00 341.9 -10.00 120.1 20 0.45 82.55 -10.00 334.2 -10.00 117.8 25 0.38 77.61 -10.00 353.1 -10.00 124.2 30 0.22 72.68 -10.00 405.1 -10.00 141.6 35 0.00 67.77 -10.00 412.2 -10.00 144.1 40 0.00 62.84 -10.00 412.2 -10.00 144.1 45 0.59 57.87 -10.00 307.0 -10.00 111.3 50 0.93 52.92 -10.00 261.1 -10.00 100.0 55 0.99 48.00 -10.00 254.4 -10.00 100.0 60 1.14 43.07 -8.86 253.7 -8.86 100.0 65 1.07 38.20 -7.55 266.5 -7.55 100.0 70 1.04 33.36 -6.08 280.6 -6.08 101.1 75 0.94 28.58 -4.40 306.0 -4.40 109.1 80 0.79 23.90 -2.46 348.2 -2.46 119.8 85 0.62 19.38 -0.19 406.3 -0.19 137.4 90 0.36 15.22 2.44 523.8 2.44 176.9 95 0.31 11.56 5.43 597.4 5.43 201.9 100 0.37 9.13 7.99 613.6 7.99 210.7 105 0.58 8.95 8.20 535.4 8.20 177.8 110 0.69 11.32 5.65 468.1 5.65 155.6 115 0.62 15.12 2.51 441.0 2.51 147.8 120 0.68 19.02 0.02 396.9 0.02 134.3 125 0.71 22.86 -1.98 367.0 -1.98 125.4 130 0.68 26.64 -3.64 354.2 -3.64 122.1 135 0.67 30.28 -5.03 342.6 -5.03 118.6 140 0.69 33.75 -6.21 327.7 -6.21 116.4 145 0.66 37.06 -7.22 323.2 -7.22 115.4 150 0.75 40.04 -8.06 301.8 -8.06 109.0 155 0.85 42.71 -8.76 281.5 -8.76 102.4 160 0.84 45.09 -9.35 277.5 -9.35 101.2 165 0.56 47.28 -9.87 313.3 -9.87 113.2 170 0.57 48.73 -10.00 311.1 -10.00 112.6 175 0.64 49.56 -10.00 300.5 -10.00 109.2 180 0.66 49.84 -10.00 297.7 -10.00 108.3

EXHIBIT A Page 10 of 10 Table of Earth Station Coordination Values 01/24/2003 Earth Station Name MARINA DEL REY CA Owner BT AMERICAS INC. Latitude (DMS) (NAD83) 33 58 55.0 N Longitude (DMS) (NAD83)118 25 38.3 W Ground Elevation (Ft/m) 15.03 / 4.58 AMSL Antenna Centerline (Ft/m) 49.67 / 15.14 AGL Antenna Model VERTEX COMMUNICATIONS 7.2 KXC Objectives: Receive -156.0 (dBW /1 MHz) Transmit -154.0 (dBW /4 kHz) TX Power -14.5 (dBW/4 kHz) Azimuth Horizon Antenna 4.0 GHz 6.0 GHz (Deg) Elevation Disc. Antenna Coordination Antenna Coordination Angle Angle Gain Distance Gain Distance (Deg) (Deg) (dBi) (Km) (dBi) (Km) 185 0.55 49.65 -10.00 314.4 -10.00 113.6 190 0.70 48.60 -10.00 291.4 -10.00 106.2 195 0.58 47.26 -9.86 309.7 -9.86 112.1 200 0.46 45.40 -9.43 336.8 -9.43 118.4 205 0.32 43.11 -8.86 384.6 -8.86 134.1 210 0.38 40.31 -8.13 373.7 -8.13 130.2 215 0.00 37.52 -7.36 446.3 -7.36 154.7 220 0.00 34.21 -6.35 460.0 -6.35 159.0 225 0.00 30.72 -5.19 475.9 -5.19 164.3 230 0.00 27.07 -3.81 496.0 -3.81 170.7 235 0.00 23.30 -2.18 521.0 -2.18 178.8 240 0.00 19.44 -0.22 552.8 -0.22 189.2 245 0.00 15.49 2.25 595.1 2.25 203.3 250 0.00 11.48 5.50 654.5 5.50 222.7 255 0.00 7.63 9.94 745.0 9.94 251.5 260 0.00 5.72 13.06 814.2 13.06 271.8 265 0.00 7.56 10.03 746.8 10.03 252.0 270 0.00 11.47 5.51 654.8 5.51 222.8 275 0.00 15.99 1.90 589.1 1.90 201.3 280 0.00 20.73 -0.91 541.4 -0.91 185.4 285 0.00 25.56 -3.19 505.5 -3.19 173.8 290 0.00 30.45 -5.09 477.3 -5.09 164.7 295 0.00 35.36 -6.71 455.1 -6.71 157.4 300 0.00 40.29 -8.13 436.0 -8.13 151.4 305 0.00 45.24 -9.39 419.8 -9.39 146.5 310 0.24 50.17 -10.00 399.7 -10.00 139.8 315 0.29 55.13 -10.00 382.0 -10.00 133.7 320 0.32 60.10 -10.00 370.6 -10.00 129.9 325 0.34 65.07 -10.00 365.6 -10.00 128.3 330 0.37 70.04 -10.00 355.7 -10.00 125.0 335 0.41 75.02 -10.00 345.9 -10.00 121.9 340 0.53 80.00 -10.00 316.1 -10.00 114.2 345 0.63 84.97 -10.00 302.3 -10.00 109.8 350 0.44 89.95 -10.00 339.0 -10.00 119.2 355 0.46 94.93 -10.00 331.3 -10.00 116.9

EXHIBIT A Page 11 of 11 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 SENIOR FREQUENCY COORDINATOR COMSEARCH 19700 JANELIA FARM BOULEVARD ASHBURN, VIRGINIA 20147 DATED: February 10, 2003



Document Created: 2003-03-14 10:20:15
Document Modified: 2003-03-14 10:20:15
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