Question

Describe briefly, by drawing suitable diagrams,the 

(i) sky wave and 

(ii) space wave modes of propagation. Mention the frequency range of the waves in these modes of propagation.

Answer 1

(i) And (ii) Sky wave propagation 

The sky wave propagation is due to the ionospheric reflection of radio waves back to the earth.

The space wave propagation is by line-of-sight propagation, directly between transmitter receiver / or by satellite. The frequency range of sky wave is few MHz to 40 MHz.

The frequency range of space wave is above MHz to 40 MHz.