DIFFERENT MODES OF PROPAGATION Radio waves Ground waves Space waves or Line of Sight waves Direct waves Ground reflected waves Sky waves MODES OF PROPAGATION FREQUENCY APPLICATION 1. Ground waves VLF LF MF 1.Submarine Communication 2.AM ,FM and television broadcasting 2. Space or line of sight waves HF VHF UHF 1.Satellite communication 2.Mobile communication 3. Sky waves 2Mhz-30Mhz 1.Microwave link 2.Radar communication