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Question

A ground receiver station is receiving a signal at (i) 5 MHz and transmitted from a ground transmitter at a height of 300 m, located at a distance of 100 km from the receiver station. The signal is coming via__________. Radius of earth = 6.4 ×106m. Nmax of isosphere = 1012m3

A
Space wave
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B
Sky wave propagation
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C
Satellite transponder
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D
All of these
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Solution

The correct option is B Sky wave propagation

Maximum distance covered by space wave communication 2Rh = 62 km
Critical frequency = fc = 9 (Nmax)129MHz
5 MHz < fc, sky wave propagation (ionospheric propagation)


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