(Q). A transmitting antenna mounted at a height of 120m radiates 15kw of power equally in all directions at a frequency of 50MHz.calculate (a) Max LOS range (b) Field strength at a receiving antenna mounted at a height of 16 m at a distance of 12Km

(a) LOS range = √2r^‘ (√h_t +√h_r )m

= √(2*4/3*r)(√120 +√16) m

= √(2*4/3*6370*10³ )(√120 +√16)

d = 61.61 Km

(b) Power(p) =15 kw

λ = 3*10⁸ /(50*10⁶ ) = 6 m

r = 12Km = 12*10³

and,

E= 88√P*h_t *h_r /( λ*r^2)

E = 88*√15000*120*16/(6*12*10^3)^2

E = 23.95 mV