Cover Letter

4717-EX-RR-1997 Text Documents

COLORADO STATE UNIVERSITY

1999-07-19ELS_10829

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                                                              .,0‘*‘ ycq""%         UNITED STATES DEPARTMENT OF COMMERCE
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                                                                                    National Oceanic and Atmospheric Adminiatration
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                                                                          "é’         AND INFORMATION SEAVICE
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                                                                                    Washington, D.C. 20233

                                                                                    Office of Radio Frequency Management
                                                                                    Room 2246, SSMC—2 _
                                                                                    1325 East West Highway
                                                                                    Silver Spring, MD 20910
                                                                                    September 19, 1997

     Richard D. Parlow
     Associate Administrator. NTIA
    U.S. Department of Commerce
    Washington, D.C. 20230

     Dear Mr. Parlow,

               The working group on 404 MHz wind profilers, chaired by Gary Patrick of NTIA, recommended an extension of
    operating authority for the period of October 1. 1996 to Sffitcmber 30, 1997. During this period, a number of constraints
    continued to be imposed on 404 MHz profilers to protect the COSPAS—SARSAT satellite system. These constraints
    included:

     ~~1)      emissions from each NOAA Profiler Network (NPN) profiler are inhibited whenever a COSPAS—SARSAT
               satellite passes within 41 degrees of the zenith above that profiler.
          2)   outside the 41 degree inhibit angle. NPN profilers operate with 6 kW peak power or less,
       3)      If an NPN profiler is detected outside 41 degrees. the inhibit angle will be increased to the angle at which
               detection occurred until corrective action can be taken.,

       4)      emissions from each non—NPN profiler are inhibited whenever a COSPAS—SARSAT satellite passes within 85
               degrees of the zenith above that profiler, and
            During this period. while operating under the constraints described above, there have been no U.S.—based or —
    operated profilers detected by SARSAT.
           In addition, in cooperation with SARSAT staff. profiler low mode peak power has been increased from 4 to 6
    kW at 25 NPN sites without incident.                                       .

               Because the performance of the 404 MHz profilers vis—a—vis COSPAS—SARSAT during the past year has been
    sgttsfactory, we recommend that existing assignments for 404 MHz profilers be extended until September 30, 1998,
    u ; the current constraints. The United States Mission Control Center will continue monitoring interference to
    COSPAS—SARSAT during this period. Furthermore, any modifications to existing wind profiler constraints during this
    one yvear period would require coordination and appropriate testing using selected wind profiler(s) and satellite passes.
    This procedure would allow prog_er validation of any suggested changes to current profiler operations, thus minimizing
    impact to the COSPAS—SARSAT system. We anticipate that further extensions will be requested beyond the September
    30, 1998 date.
                                                                                Sincerely,



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    Gary Patrick
    Chairman                    Army Representative                AF Representative
                                                                                                                       C
                                                                                                         CG Representative


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Document Created: 2001-08-21 04:48:25
Document Modified: 2001-08-21 04:48:25

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