ITU

التزام بتوصيل العالم

Routine ionospheric sounding

Opinion 22

Main
Number
Title Status
Op.22-7 (2007)
 
Routine ionospheric sounding  
In force (Main)
 
 
Previous versions
Number
Title Status
Op.22-6 (1999)
 
Routine ionospheric sounding  
Superseded