Question

Expression for radio horizon in km is ____

(a) \(4.12(\sqrt{h_t}+\sqrt{h_r})\)

(b) \(4.12(\sqrt{h_t}-\sqrt{h_r})\)

(c) \(3.56(\sqrt{h_t}+\sqrt{h_r})\)

(d) \(3.56(\sqrt{h_t}-\sqrt{h_r})\)

The question was asked by my school teacher while I was bunking the class.

My doubt stems from Space Wave Propagation topic in section Space Wave Propagation of Antennas

Answer 1

Right choice is (c) \(3.56(\sqrt{h_t}+\sqrt{h_r})\)

To explain I would say: Radio horizon is the point to which a space wave can reach maximum. Expression for radio horizon in km is \(d = 3.56(\sqrt{h_t}+\sqrt{h_r})\)

Expression for the LOS distance is \(d = 4.12(\sqrt{h_t}+\sqrt{h_r})\) in km.