INTERNATIONAL TELECOMMUNICATION UNION RADIOCOMMUNICATION BUREAU (Direct Fax No. +41 22 730 57 85) Administrative Circular CAR/3 25 November 1993 TO THE ADMINISTRATIONS OF MEMBERS OF THE ITU Subject: Proposed approval of 30 draft new or revised Recommendations adopted by Radiocommunication Study Group 7 (Science Services) at its meeting from 27-29 October 1993 At the meeting of Radiocommunication Study Group 7 (Science Services), held from 27-29 October 1993, the Study Group unanimously adopted the texts of 30 draft new or revised Recommendations and agreed to apply the procedure of Resolution ITU-R 1 (see § 10) for approval of Recommendations between Radiocommunication Assemblies. The titles of these Recommendations are given in Annex 1. Having regard to the the provisions of § 10 of Resolution ITU-R 1, I should be grateful if you would inform me by 28 February 1994, whether your Administration approves or does not approve these draft Recommendations. A copy of this letter is being sent for information to the recognized operating agencies, scientific or industrial organizations and international organizations participating in the work of Radiocommunication Study Group 7. A Member who indicates that a draft new or revised Recommendation should not be approved is requested to advise the reason and indicate possible changes in order to facilitate further consideration by Radiocommunication Study Group 7 during the study period. After the above-mentioned deadline, the Director of the Radiocommunication Bureau will notify the result of this consultation by Administrative Circular and make arrangements for the Recommendations to be published in accordance with Resolution ITU-R 1. Richard C. Kirby Director Annexes: List of documents with titles Documents 7/BL/10 to 7/BL/39 Distribution: - Administrations of Members of the ITU Distribution for information: - Participants in the work of Radiocommunication Study Group 7 (Administrations and Organizations) ------- ANNEX 1 LIST OF DRAFT NEW AND REVISED RECOMMENDATIONS ADOPTED BY RADIOCOMMUNICATION STUDY GROUP 7 (GENEVA, 27-29 OCTOBER 1993) Draft new Recommendations : Draft new Recommendation ITU-R TF.[Doc. 7/45(Rev.1)] (Doc. 7/BL/10) RELATIVISTIC EFFECTS IN A COORDINATE TIME SYSTEM IN THE VICINITY OF THE EARTH Draft new Recommendation ITU-R TF.[Doc. 7/47) (Doc. 7/BL/12) SYSTEMS, TECHNIQUES AND SERVICES FOR TIME AND FREQUENCY TRANSFER Draft new Recommendation ITU-R SA.[Doc. 7/59] (Doc. 7/BL/15) PREFERRED FREQUENCY BANDS FOR DEEP-SPACE RESEARCH IN THE 1-40 GHz BAND Draft new Recommendation ITU-R SA.[Doc. 7/60] (Doc. 7/BL/16) PREFERRED FREQUENCY BANDS FOR DEEP-SPACE RESEARCH IN THE 40-120 GHz BAND Draft new Recommendation ITU-R SA.[Doc. 7/62] (Doc. 7/BL/17) TELECOMMUNICATION REQUIREMENTS FOR MANNED AND UNMANNED DEEP-SPACE RESEARCH Draft new Recommendation ITU-R SA.[Doc. 7/63] (Doc. 7/BL/18) BANDWIDTH REQUIREMENTS FOR DEEP-SPACE RESEARCH Draft new Recommendation ITU-R SA.[Doc. 7/64] (Doc. 7/BL/19) SHARING CONSIDERATIONS RELATING TO DEEP-SPACE RESEARCH Draft new Recommendation ITU-R SA.[Doc. 7/65] (Doc. 7/BL/20) PREFERRED METHOD FOR CALCULATING LINK PERFORMANCE IN THE SPACE RESEARCH SERVICE Draft new Recommendation ITU-R SA.[Doc. 7/74] (Doc. 7/BL/22) PERFORMANCE CRITERIA FOR SATELLITE PASSIVE REMOTE SENSING Draft new Recommendation ITU-R SA.[Doc. 7/75] (Doc. 7/BL/23) INTERFERENCE CRITERIA FOR SATELLITE PASSIVE REMOTE SENSING Draft new Recommendation ITU-R SA.[Doc. 7/76] (Doc. 7/BL/24) HYPOTHETICAL REFERENCE SYSTEM FOR THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL SATELLITE SERVICES Draft new Recommendation ITU-R SA.[Doc. 7/78] (Doc. 7/BL/26) METHODOLOGY FOR DETERMINING PERFORMANCE OBJECTIVES FOR SYSTEMS IN THE EARTH EXPLORATION- SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES Draft new Recommendation ITU-R SA.[Doc. 7/80] (Doc. 7/BL/28) METHODOLOGY FOR DETERMINING INTERFERENCE CRITERIA FOR SYSTEMS IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES Draft new Recommendation ITU-R SA.[Doc. 7/81] (Doc. 7/BL/29) PERFORMANCE CRITERIA FOR SPACE-TO-EARTH DATA TRANSMISSION SYSTEMS OPERATING IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES USING SATELLITES IN LOW-EARTH ORBIT Draft new Recommendation ITU-R SA.[Doc. 7/82(Rev.1)] (Doc. 7/BL/30) INTERFERENCE CRITERIA FOR SPACE-TO-EARTH DATA TRANSMISSION SYSTEMS OPERATING IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES USING SATELLITES IN LOW-EARTH ORBIT Draft new Recommendation ITU-R SA.[Doc. 7/83) (Doc. 7/BL/31) METHODOLOGY FOR DETERMINING SHARING AND COORDINATION CRITERIA FOR SYSTEMS IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES Draft new Recommendation ITU-R SA.[Doc. 7/84] (Doc. 7/BL/32) NECESSARY BANDWIDTHS AND PREFERRED FREQUENCY BANDS FOR DATA TRANSMISSION FROM EARTH EXPLORATION-SATELLITE (NOT INCLUDING METEOROLOGICAL-SATELLITES) Draft new Recommendation ITU-R SA.[Doc. 7/86] (Doc. 7/BL/34) TELECOMMUNICATION REQUIREMENTS OF SATELLITE SYSTEMS FOR GEODESY AND GEODYNAMICS Draft new Recommendation ITU-R SA.[Doc. 7/87(Rev.1)] (Doc. 7/BL/35) SHARING AND COORDINATION CRITERIA FOR SPACE-TO-EARTH DATA TRANSMISSION SYSTEMS IN THE EARTH EXPLORATION- SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES USING SATELLITES IN LOW-EARTH ORBIT Draft new Recommendation ITU-R SA.[Doc. 7/97] (Doc. 7/BL/37) HYPOTHETICAL REFERENCE SYSTEM FOR SYSTEMS COMPRISING DATA RELAY SATELLITES IN THE GEOSTATIONARY ORBIT AND USER SPACECRAFT IN LOW EARTH-ORBITS Draft new Recommendation ITU-R SA.[Doc. 7/98] (Doc. 7/BL/38) PREFERRED FREQUENCY BANDS AND TRANSMISSION DIRECTIONS FOR DATA RELAY SATELLITE SYSTEMS Draft new Recommendation ITU-R RA.[Doc. 7/104) (Doc. 7/BL/39) PROTECTION OF THE RADIOASTRONOMY SERVICE IN FREQUENCY BANDS SHARED WITH OTHER SERVICES Draft revised Recommendations : Draft revision of Recommendation ITU-R TF.583-1 (Doc. 7/BL/11) TIME CODES Draft revision of Recommendation ITU-R TF.768 (Doc. 7/BL/13) STANDARD FREQUENCIES AND TIME SIGNALS Draft revision of Recommendation ITU-R TF.538-2 (Doc. 7/BL/14) MEASURES FOR RANDOM INSTABILITIES IN FREQUENCY AND TIME (PHASE) Draft revision of Recommendation ITU-R SA.515-1 (Doc. 7/BL/21) FREQUENCY BANDS AND BANDWIDTHS USED FOR SATELLITE PASSIVE SENSING Draft revision of Recommendation ITU-R SA.577-2 (Doc. 7/BL/25) PREFERRED FREQUENCIES AND NECESSARY BANDWIDTHS FOR SPACEBORNE ACTIVE REMOTE SENSING Draft revision of Recommendation ITU-R SA.516 (Doc. 7/BL/27) FEASIBILITY OF SHARING BETWEEN ACTIVE SENSORS USED ON EARTH EXPLORATION AND METEOROLOGICAL SATELLITES AND THE RADIOLOCATION SERVICE Draft revision of Recommendation ITU-R SA.514-1 (Doc. 7/BL/33) INTERFERENCE CRITERIA FOR COMMAND AND DATA TRANSMISSION SYSTEMS OPERATING IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES Draft revision of Recommendation ITU-R SA.363-4 (Doc. 7/BL/36) SPACE OPERATION SYSTEMS Frequencies, bandwidths and protection criteria _________________ Place des Nations CH-1211 Genève 20 (Switzerland) Telephone National (022) 730 51 110 Telephone International +41 22 730 51 110. 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