Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30MHz? Expain diagrammatically how long distance communication can be achieved by this mode.Why is there an upper limit to frequency of waves used in this mode?
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Mode of propagation is sky wave propagation.
For the diagram refer the animation given in the study material.
Why is there an upper limit to frequency of waves used in this mode?
There is an upper limit to frequency of waves for this mode because higher frequency goes beyond the ionosphere and there is no reflection of wave.