INTERNATIONAL TELECOMMUNICATION UNION
RADIOCOMMUNICATION ADVISORY GROUP

GENEVA, 23-25 JANUARY 1995 Document RAG95/6-E
9 December 1994
Original: English
                                 
                                 
                                 
                   Chairman, ITU-R Study Group 9
                                 
                                 
             POSSIBLE REFERENCE TO NATIONAL STANDARDS
                     IN ITU-R RECOMMENDATIONS
                                                                  

     Working Party 9C prepared the attached Doc. 9C/TEMP/13
concerning possible reference to national standards in ITU-R
Recommendations. The RAG is invited to consider whether the text of
the attached Annex 2 is acceptable as an exceptional case.


Annexes: 2

                              ANNEX 1

INTERNATIONAL TELECOMMUNICATION UNION
RADIOCOMMUNICATION STUDY GROUPS Document 9C/TEMP/13-E
1 November 1994
Original: English only
                                
                                                                 
                         Working Party 9C
                                 
                                 
             POSSIBLE REFERENCE TO NATIONAL STANDARDS
                     IN ITU-R RECOMMENDATIONS
                                 
                                 

     Working Party 9C proposed to refer to the United States
Federal Standard 1045A in Recommendation ITU-R F.1110. The United
States Federal Standard is a well documented and detailed document,
which is a valuable source of additional information. This Standard
is well known and stable.

     Working Party 9C would like the Study Group 9 Chairman to
obtain an opinion from the Radiocommunication Advisory Group
concerning identification of the Standard in a Note to
Recommendation ITU-R F.1110 (see Annex 2) as a reference.


                              ANNEX 2
                                 
                                 
Source:Doc. 9/BL/78
                                 
                                 
                                 
                    Proposed draft amendment to
                                 
                                 
                                 
                    RECOMMENDATION ITU-R F.1110
                                 
                                 
              ADAPTIVE RADIO SYSTEMS FOR FREQUENCIES
                        BELOW ABOUT 30 MHz
                                 
                      (Question ITU-R 147/9)


The ITU Radiocommunication Assembly,
     
     considering

a)   that HF sky-wave links allow communication over large
distances;

b)   that, up to now, natural ionospheric variations and
interference resulting from spectral congestion and propagation
anomalies have made HF links difficult to operate and demanded
highly skilled operators;

c)   that technological progress in recent years has led to the
development of adaptive systems which can be used to automate HF
links and enhance their quality;

d)   that adaptive systems make it possible:

     - to achieve a higher quality of service by combining an
        ability to exploit modern radio-frequency technology with
        advanced real-time control software; the result is a system
        which is reliable, robust, cost-effective and easy to use;

     - to establish extensive HF networks with flexible, less
        hierarchical architecture;

     - to reduce transmission times thereby:
        - securing more efficient use of the spectrum;
        - reducing the interference between users;
        - providing the ability to increase traffic density,
     
     recommends

1    that adaptive HF systems should have the general
characteristics given in Annex 1;

2    that the assignment of frequencies to such systems should
follow the principles set out in Annex 2.

Note - Different adaptive systems are described in United States
Federal Standard 1045A (HF Radio Automatic Link Establishment and
Annexes 3, 4, 5, 6 and 7 to this Recommendation.


Editorial Note - The rest of the text of this Recommendation would
remain unchanged.
                                 
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