Question

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. 73 $\Omega$
• B. 36.5 $\Omega$
• C. 25$\Omega$
• D. 50 $\Omega$

Answer 1

The correct option is B 36.5 $\Omega$

Ans : (b)

$\frac{\lambda }{4}=\frac{492}{4}=123\simeq L$

$\therefore$ It is a quarter wave monopole antenna.

So, $R_{rad}=36.5\Omega$