A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. Identify whether it is coming $via$:(Radius of earth$= 6.4 imes 10^{6}$m); $N_{\max}$ of ionosphere$= 10^{12}\ m^{- 3}$

Question

A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. Identify whether it is coming $via$:(Radius of earth$= 6.4 	imes 10^{6}$m); $N_{\max}$ of ionosphere$= 10^{12}\ m^{- 3}$

Dr. Abubacker · Accepted Answer

(c) Maximum distance covered by space wave communication
$= \sqrt{2Rh} = \sqrt{2 	imes 6.4 	imes 10^{6} 	imes 300} = 62 	imes 10^{3}m$
Since, receiver-transmitter distance is 100 km. Therefore, signal cannot go either by ground wave or space wave. For sky wave, the value of critical frequency of signal should be
$v_{c} = 9\left( N_{\max} ight)^{\frac{1}{2}} = 9\left( 10^{12} ight)^{1/2} = 9\ MHz$
Therefore, signal can propagatic $via$ sky wave propagation

Q. A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. Identify whether it is coming $via$:(Radius of earth$= 6.4 \times 10^{6}$m); $N_{\max}$ of ionosphere$= 10^{12}\ m^{- 3}$

Explanation

Reviewed by Dr. Abubacker

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