5 Sem Communication Lab
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Transcript of 5 Sem Communication Lab
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DEPARTMENT OF
INFORMATION TECHNOLOGY & ELECTRONICS ENGINEERING
M.L.V. TEXTILE & ENGINEERING COLLEGE BHILWARA
5EC COMMUNICATION LAB-IIncharge:-Mr. Ritesh Saraswat
T.A.:- Pankaj Parul
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LIST OF EXPERIMENT
First Rotor
1. Harmonic analysis of a square wave of a modulatedwaveform.
2.Observe the amplitude modulated waveform &
measure modulation index. Demodulation of AM signal.
3. Generation and demodulation of DSB-SC signal.
4. Modulate a signal with high frequency carrier toobtain FM signal. Demodulation of the FM signal.
5. To observe the following in a transmission linedemonstration kit:
(a)The propagation of pulse in non reflectingtransmission line.
(b) The effect of lose in transmission line
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Second Rotor
(c) transmission with standing waves on a transmissionline
(d) the resonance characteristic of a half wave lengthlong X-mission line
6. (a) To observe the operation of sampling and sample &
hold circuit.(b) To study the effect of sampling time.
(c) To study the effect of changing the samplingfrequency & observing aliasing phenomena.
7. To study and observe the operation of a super
heterodyne receiver. 8. To study and observe the amplitude response of
automatic gain controller(AGC).
9,10. PAM,PWM &PPM: modulation and demodulation.
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Way Of Report Writing
Object/Aim
Required Material
Circuit/Block Diagram
Theory Description
Procedure
Observation
Calculation & Error
Graph
Result
Precautions
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Pre-Lab 1
What is the meaning of spectrum analyser and
harmonic analyser?
How we can remove harmonic from frequency
Spectrum?
Compare harmonic analyser & spectrum analyserof a square waveform of a modulated signal
waveform?
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Experiment:-1
Object:-Harmonic analysis of a square wave of amodulated waveform.
Apparatus Required:-
1BNC Probe
1Function Generator
1Spectrum Analyzer
Qty.Name
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Theory:-About Spectrum Analyzer, frequencyMeasurement & Video filtering
Procedure:-
Circuit Diagram:-
Observations:-Input frequency (MHz), scan width(MHz/Div) & Attenuation (db)
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Graph:-
Result:-
Precautions:-
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Pre-lab 2
Define modulation index & derive its expression &
draw the waveform in case of over modulation and
under modulation?
Draw the AM waveform & derive the expression of
power & AM signal waveform?
Explain various types of AM signal?
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Experiment-2
Object:- Observe the amplitude modulated
waveform & measure modulation index.
Demodulation of AM signal.
Apparatus Required:-
2DSO Probe
1DSO
6Connecting Leads
1AM Receiver kit
1AM Transmission kit
Qty.Name
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Theory:- About- Amplitude modulation, AMTransmitter & Receiver.
Procedure:- According to manual
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Circuit/Block Diagram:-
AudioOscillator
Carrier
Wave
Generator
Modulator Out Put
Amplifier
Antenna
Information
signal
Carrier
WaveAM Transmission System
RF Amplifier Mixer
Local
Oscillator
IF Amplifier Diode
Detector
Audio
Amplifier
Antenna
AM Receiver System O/P Signal
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Observations:-
For Base Band Signal - I/p audio frquency,voltage
(p-p)
For Modulated Signal - Vmax ,Vmin & Frequency
For Demodulated Signal-Frequency & Voltage
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Graph:-
Ampl itude modulation model graph
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Ampl i tude Demodulation Waveform
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Result:-
Precautions:-
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Pre-lab 3
Compare DSB-SC with DSB-FC and SSB-FC?
Draw the DSB-SC waveform:
case(1) m1
Explain the demodulation process of DSB-SCsignal?
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Experiment:-3
Object:-Generation and demodulation of DSB-SC signal.
Apparatus Required:-
2DSO Probe
1DSO
6Connecting Leads
1AM Receiver kit
1AM Transmission kit
Qty.Name
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Theory:- About- Amplitude modulation ,DSB-SC,SSB-SC signal, AM Transmitter & Receiver.
Procedure:- According to manual
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Circuit/Block Diagram:-
AudioOscillator
Carrier
Wave
Generator
Modulator Out Put
Amplifier
Antenna
Information
signal
Carrier
WaveAM Transmission System
RF Amplifier Mixer
Local
Oscillator
IF Amplifier Diode
Detector
Audio
Amplifier
Antenna
AM Receiver System O/P Signal
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Graph:-
Result:-
Precautions:-
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Pre-lab 4
What is the difference b/w AM and FM?
Explain any one generation method of FM signal?
Compare frequency modulation with phasemodulated signal?
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Experiment:-4
Object:-Modulate a signal with high frequency
carrier to obtain FM signal. Demodulation of the FM
signal.
Apparatus Required:-
7Connecting Leads
2DSO Probe
1DSO
1FM Transmission &
Receiver kit
Qty.Name
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Theory:- About Frequency Modulation &Demodulation
Procedure:- As per manual
C /
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Circuit/Block Diagram:-
Audio Oscillator
Carrier Generator
FM Modulator O/p Amplifier
Antenna
Information signal
Carrier Wave
FM Transmission System
RF
Amplifier Mixer IF AmplifierDemodulat
or Amplifier
Speaker
FM Receiver System
Antenna
Local Oscillator
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Observation:-For Base Band Signal - I/p audio frequency &
voltage (p-p)
For Modulated Signal - voltage & Frequency
For Demodulated Signal-Frequency & Voltage
Graph:-
Result:-
Precautions:-
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Pre-lab 5
Explain the following term:(1) standing wave ratio(2) reflection coefficient
Explain diff. Type of loses in transmission line?
Derive the expression of characteristic
impedance of zoof transmission line?
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Experiment:-5
Object:- To observe the following in a transmission linedemonstration kit:
(a)The propagation of pulse in non reflecting transmissionline.
(b) The effect of lose in transmission line(c) transmission with standing waves on a transmission line
(d) the resonance characteristic of a half wave length long X-mission line
Apparatus Required:-
1BNC to BNC
2DSO Probe
1Multimeter
1DSO
1Transmission Line Trainer
Qty.Name
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Experiment:-5
Theory:-About Transmission Line & Different
types of losses in it
Procedure:-
Circuit Diagram:-
Observations:-
Graph:-
Result:-
Precautions:-
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Pre-lab 6
Explain sampling theorem with suitable diagram
and expression of Nyquist rate?
What is the meaning of aliasing and how we can
remove it?
Explain the operation of sample and hold ckt ?
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Experiment:-6
Object:- (a) To observe the operation ofsampling and sample & hold circuit.
(b) To study the effect of sampling time.
(c) To study the effect of changing the samplingfrequency & observing aliasing phenomena.
Apparatus Required:-
5Connecting leads
2DSO Probe
1DSO
1Sampling trainer kit
Qty.Name
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Experiment:-7
Object:-To study and observe the operation of asuper heterodyne receiver.
Apparatus Required:-
4Connecting leads
1Multimeter
2CRO Probe
1CRO
1Super heterodyne
receiver kit
Qty.Name
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Theory:-
Procedure:-
Circuit Diagram:-
Observations:- Fault Finding at different points
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Graph:-
Result:-
Precautions:-
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Pre-lab 8
What is the purpose of AGC and explain its
working?
What is difference between AGC and AFC?
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Experiment:-8
Object:- To study and observe the amplituderesponse of automatic gain controller(AGC).
Apparatus Required:-
4Connecting leads
1Function generator
2CRO Probe
1CRO
1AGC Trainer kit
Qty.Name
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Theory:-
Procedure:-
Circuit Diagram:-
Observations:- Voltage & frequency
Sr.
no
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Graph:-
Result:-
Precautions:-
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Pre-lab 9
How we can generate PPM from PWM?
Compare PPM with PAM , PWM?
Explain demodulation process of PWM?
Explain the generation method of PAM and PWM?
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Experiment:-9
Object:- PAM,PWM &PPM: modulation anddemodulation
Apparatus Required:-
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Theory:-
Procedure:- Circuit Diagram:-
Observations:-
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Graph:-
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Result:-
Precautions:-
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