Question 20

1. Given the following FM modulated signal equation, determine the original message equation, m(t).

   s(t)= 1.8cos(22.4GHz*t + 3sin(222kHz*t)), Kvco=4500 (Hz/v)

   		a. m(t)= 1.8cos(22.4E9t)
   		b. m(t)= 1.8cos(222E3t)
   		c. m(t)= 14.7cos(222kHz*t)
   		d. m(t)= 3cos(213E3t)

10 points

Question 21

1. Given the following FM modulated signal equation, determine the frequency bandwidth. s(t)=2cos(21E9t + 4sin(21E3t))

   		a. 20kHz
   		b. 10kHz
   		c. 1kHz
   		d. 106 kHz

10 points

Question 22

1. Given the following message, m(t), carrier, c(t), and Kp=0.1(rad/v), determine the PM modulated signal equation and PM index. m(t)=2cos(24000t), c(t)=4cos(28MHzt).

   		a. s(t)=4cos(24E6t + 0.75cos(23500t)), PM=0.75
   		b. s(t)=4cos(28E6t + 0.2cos(24E3t)), PM=0.2
   		c. s(t)=3cos(24E6t + 0.75cos(23500t)), PM=0.75
   		d. s(t)=4cos(24000t + 0.2cos(28E6t)), PM=0.2

10 points

Question 23

1. Given the following PM modulated signal equation, determine the original message equation, m(t). s(t)=3.2cos(22E9t + 0.99cos(25000t)), Kp=0.33 (Hz/v)

   		a. m(t)= 4.4cos(25000t)
   		b. m(t)= 4.4cos(22E9t)
   		c. m(t)= 3cos(25000t)
   		d. m(t)= 3.2cos(22E9t)

Question 24

1. Given the following PM modulated signal equation, determine the frequency bandwidth. s(t)=3cos(213E9t + 2cos(213E3t))

   		a. 22kHz
   		b. 40kHz
   		c. 78 kHz
   		d. 116 kHz

Question 25

1. Regarding phase modulation (PM), an increase in the PM index, , results in an increase in the modulated signals bandwidth.

   True

   False