Question 1

A 10-MHz carrier is frequency modulated by a 10-KHz sinusoid so that the peak frequency deviation is

100 Hz. Determine

AThe approximate bandwidth of the FM signal.

BThe bandwidth if the modulation signal amplitude is doubled

CThe bandwidth if the modulation signal frequency is doubled

DThe bandwidth if both the modulation signal amplitude and frequency are doubled

e)

Question 2

A frequency modulated signal is given by

() = 10 (2 ⨯ 105

• 5 sin(2 ⨯ 1500) + 2sin(2 ⨯ 1000))
  

What is the frequency modulation index of the above signal?

Question 3

The sinusoidal signal () = cos(2000) is applied to the input of an FM system. The corresponding

modulated signal output is

() = 100(2 ⨯ 107

• 4 sin(2000))
  

Across a 50-ohm resistive load.

AWhat is the peak frequency deviation from the carrier?

BWhat is the total average power developed by ()?

CWhat is the percentage of the average power at 10 MHz?

DWhat is the approximation bandwidth using Carson’s rule?