Attachment 7.2m freq

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

IBFS_SESMOD2003031400345_308591

                                          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 10:21:47
Document Modified: 2003-03-14 10:21:47

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