COMNET Assignment (2)

What is the advantage of using square wave-form as an Input Signal? What is the shape of the outputwhen the input signals are sinusoidal and triangular in shape? (Hint: Use Function generator andOscilloscope to observe the output)

Q1. An FM transmitter has the block diagram shown in Figure Q1. The audio frequency response is constant over the 20 Hz to 20 kHz audio band. The FM output signal is to have a carrier frequency of 90.7 MHz and a peak deviation of 75 kHz. (a) Find the bandwidth and centre frequency required for the bandpass filter. FM exciter fc = 5.00 MHz Oscillator fo= ? Bandpass filter Figure Q1. x8 Frequency multiplier Class C amplifier FM output

An Oscilloscope is set; such that Attenuator Key (Voltage Key) is at (4V/div) position and the Time Base Key is at (10 ms/div). If a signal of maximum voltage Vmax = 8V, and frequency f = 50 Hz. Draw the signal displayed on the oscilloscope.

The RF signal generator is used to produce an AM signal using an AF signalgenerator as the source of modulating signal. The RF generator is thenconnected to the oscilloscope. The oscilloscope displays an overmodulatedAM signal. What adjustment would you do to produce an undistorted AMsignal?

1. The purpose of the Lag Compensator is: I. Improve the study state response of the close system. II. Speed up the transit response. III. All the above. IV. None of the above.  2. In the Lead Compensator:  I. Z > P. II. Z < P. III. Z = P. IV. None of the above.

7-2

A 2 kHz sinewave is mixed with a 1.5 MHz carrier sinewave through a nonlinear device. Which frequency is not present in the output signal?   a. 3 MHz   b. 3.004 MHz   c. 1.498 MHz   d. 1.502 MHz

What is modulation? Why is it done? Describe one of the types of amplitude modulation

Draw the Q output on the waveform

Identify the mathematical operation performed by an amplitude modulator (AM). Division Multiplication Subtraction Addition