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Mention three different modes of propaga...

Mention three different modes of propagation used in communication system. Explain with the help of a diagram how long distance communication can be achieved by ionospheric reflection of radio waves.

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(i) Ground wave or surface wave propagation.
(ii) Sky wave propagation or ionospheric propagation. (iii) Space wave propagation/Line of sight propagation.

When radio wave (frequency range 3 MHz to 30 MHz), emitted from the transmitting antenna, reach the receiving antenna after reflection from the ionosphere which acts as a reflector for radio waves, the corresponding mode of propagation is known as sky wave propagation.
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