CONTENTS

Annex 1
 1     Introduction      
 2     Structure of the Recommendation 
 3     General considerations     
        3.1     Assumptions          
        3.2     Overview of propagation models    
 4     Radio-climatic information
        4.1     Radio-climatic data
        4.2     Radio-climatic zones          
        4.3     Use of radio-climatic information from other Recommendations      
 5     Distance limits   
        5.1     Minimum distance limits     
        5.2     Maximum distance limits    
        5.3     Use of distance limits for iterative calculations         
 6     Determination of the coordination distance for propagation mode (1) Great circle propagation mechanisms    
        6.1     Coordination distances based on worst-month time percentages     
        6.2     Calculation of the coordination distance for propagation mode (1)   
 7     Determination of the coordination distance for propagation mode (2) Scattering from hydrometeors    
        7.1     General  
        7.2     Coordination distances based on worst-month time percentages     
        7.3     Calculation of contours for propagation mode (2)   
 8     Auxiliary contours
        8.1     General  
        8.2     Hydrometeor scatter (propagation mode (2))         
Appendix 1 to Annex 1    
Appendix 2 to Annex 1 - Calculation of the coordination distance for propagation mode (1)    
 1     Site shielding     
 2     Frequencies from 100 MHz up to and including 790 MHz
 3     Frequencies between 790 MHz and 60 GHz        
 4     Frequencies between 60 GHz and 105 GHz         
Appendix 3 to Annex 1 - Calculation of the coordination distance for propagation mode (2)    
 1     Overview   
 2     Maximum calculation distance      
 3     Calculation of the propagation mode (2) coordination contour       
 4     Determination of auxiliary contours for propagation mode (2)        
        4.1     The step-by-step algorithm
Appendix 4 to Annex 1 - Reference radiation patterns for line-of-sight radio-relay system antennas for use in coordination studies and interference assessment in the frequency range from 1 to about 40 GHz (based on Recommendation ITU-R F.699)    
Appendix 5 to Annex 1 - Input and derived parameters