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An AM transmitter records an antenna cur...

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 ?

Text Solution

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The correct Answer is:
45.3
Here, `1_t = 10.5 A and I_c = 10` A,`mu` = ?
As `sqrt(1+mu^2/2)=I_t/I_c=(10.5)/10=21/20`
`:. 1+mu^2/2=441/400=1+41/400`
`mu^2 =82/400 = 0.205`
`mu = sqrt(0.205) = 0.453 = 45.3%`
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