Question

Suppose thatthere are two antennas A and B respectively. A is transmitter withheight 50 meters while B is receiver with height 15 meters.Considering LOS (Line-of-Sight),

a) Compute thathow much distance it should cover by transmission?

b) If distance is30 Km then what height is required for antenna B while consideringsame height of antenna A as mentioned in abovestatement?

Answer 1

Answer:    (a) 45 km

                  (b) 53 km

Explanation:

(a)        

       h = Height of antenna.

        D =Distance between antenna's horizon in km  

        k =adjustment factor and it is 4/3 commonly.

       Formula:  

                          $D=3.57(\sqrt{kh_a}+\sqrt{kh_b})$

                             =3.57 x 12.64

                             = 45 km

(b)

      Distance D=30km

                   $D=3.57\sqrt{kh}$

                   $30=3.57\sqrt{4h/3}$

                 h = (30 /4.122)²  

                 h = (7.28)2 = 52.96 ˜ 53m.