relay stations installed in different locations enable radiocommunications in estonian airspace even at lower altitudes; all of them are integrated into a common network. every ats unit has a separate, designated to it, radio frequency. taking into account the importance of radio communication, it is not...
relay stations installed in different locations enable radiocommunications in estonian airspace even at lower altitudes; all of them are integrated into a common network. every ats unit has a separate, designated to it, radio frequency. taking into account the importance of radio communication, it is not...