1.

A medium wave radio transmitter operating at a wavelength of 492 m has a tower antenna of height 124 m. What is the radiation resistance of the antenna(a) 25 Ω(b) 36.5 Ω(c) 50 Ω(d) 73 Ω

Answer»

The correct option is (b) 

Explanations:

Medium wave Radio transmitter operating at

λ = 492 m

Height of antenna = 124 m ≅ λ /4

Thus it is a quarter wave monopole hence

Rrad ≅ 36.5 Ω 



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