# EET 280 U2 Assignment Problems 2016

Question # 00219346 Posted By: Prof.Longines Updated on: 03/11/2016 12:28 AM Due on: 03/11/2016
Subject Engineering Topic General Engineering Tutorials:
Question
Question 1:
The output voltage of an AM transmitter is given by

voltage is fed to a load of

800

500 1 0.4sin 3140t sin 6.28 107 t

. This

. Determine

a) The carrier frequency
=6.28*10^7/2*3.14=98646009.32Hz

f) The maximum envelope voltage=
(1+.4)500=700V
g) The minimum envelope voltage=500-

b) The modulating frequency=

200=300V
h) The Carrier Power=

3140/2*3.14=4932.300466Hz
c) The peak carrier amplitude= 500V
d) The peak modulating signal

500^2/2*800=156.25W
i) The Sideband power= .

amplitude=.4*500=200V
e) The modulation index=.4

4^2/2*156.25=12.5W
j) The mean Power= (1+4^2/2)*156.25=
168.75W

Question 2:
An audio frequency signal

50sin 2 10 t
5

a)
b)
c)
d)

10sin 2 500t

is used to amplitude modulate a carrier of

. Calculate

The modulation index=10
The sideband frequencies=
The sideband amplitudes=
The bandwidth

e) Total power delivered to a 700

f) Question 3:
g) A continuous spectrum baseband signal has a spectrum extending from near dc to 6kHz.
It is applied as an input to an ideal balanced modulator. The carrier input is a sinusoid
having a frequency of 1.2MHz.
a) Determine the ranges of frequencies contained in the DSB output spectrum
b) Determine the required transmission bandwidth
c) It is desired to convert the DSB signal described above to SSB signal by passing
the signal though an appropriate band pass filter. Determine the range of frequencies
contained in the output spectrum.
h) Question 4:
i) An AM signal has an unmodulated peak carrier level of 200 V. Determine the maximum
and minimum levels of the positive envelope for the following modulation percentages
a) 30%
b) 75%
c) 100%
j) Question 5:
k) For a single tone modulating signal of 5 kHz and a carrier frequency of 100 kHz, list the
frequencies appearing in the spectra of the following modulated signals
a) DSB
b) SSB-LSB
c) SSB-USB
d) Conventional AM ( Full carrier AM)
Tutorials for this Question
1. ## Solution: EET 280 U2 Assignment Problems 2016

Tutorial # 00214439 Posted By: Prof.Longines Posted on: 03/11/2016 12:29 AM
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