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Wave Optics

Question

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An AM transmitter records an antenna current of 10.5 A. The antenna current drops to 10 A when only carrier is transmitted. What is the percentage modulation?

Solution

Given,

$Antenna current, I_{t} = 10.5 A Antenna current when only carrier is transmitted, I_{c} = 10 A$

We have,
   $\sqrt{1 + \frac{μ^{2}}{2}} = \frac{I_{t}}{I_{c}} = \frac{10.5}{10} = \frac{21}{20}$

$∴$    $1 + \frac{μ^{2}}{2} = \frac{441}{400} = 1 + \frac{41}{400}$

$μ^{2} = \frac{82}{400} = 0.205 μ = \sqrt{. 205} = 0.456 = 45.3 % .$

is the required percentage modulation.

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Wave Optics

An AM transmitter records an antenna current of 10.5 A. The antenna current drops to 10 A when only carrier is transmitted. What is the percentage modulation?

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