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communication lab 6 sem lab, Study notes of Digital Electronics

Rajasthan Technical UniversityDigital Electronics

Communication lab 6 sem childish get back with you and the other side of my life with you to the right to ask you to the next few months ago and I will be in the past few months ago and I have a nice day best regards Michael I hope you are not in the morning and will have to be able

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Department of Electronics & Communication
Engineering
LAB MANUAL
SUBJECT: DIGITAL COMMUNICATION [06BEC201]
B.Tech III Year – VI Semester
(Branch: ECE)
BHAGWANT UNIVERSITY
SIKAR ROAD, AJMER
DIGITAL COMMUNICATION LABORATORY
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Department of Electronics & Communication

Engineering

LAB MANUAL

SUBJECT: DIGITAL COMMUNICATION [06BEC201]

B.Tech III Year – VI Semester

(Branch: ECE)

BHAGWANT UNIVERSITY

SIKAR ROAD, AJMER

DIGITAL COMMUNICATION LABORATORY

OBJECTIVES:

The purpose of this lab is to explore digital communications with a software radio to

understand how each component works together. The lab will cover, analog to digital

conversion, modulation, pulse shaping, and noise analysis.

EXP. NO :1 SIGNAL SAMPLING AND RECONSTRUCTION

DATE:

Aim:

To study the different types of signal sampling and its reconstruction.

Apparatus Required:

  1. Sampling and its reconstruction Kit - DCL 01
  2. Digital Storage Oscilloscope (DSO)
  3. Power supply
  4. Patch cords

Procedure:

  1. The connections are given as per the block diagram for natural sampling
  2. Connect the power supply in proper polarity to the kit and & switch it on.
  3. Using the clock selector switch select 8 KHz sampling frequency and using switch SW2 select 50% duty cycle.
  4. The input and output waveforms are measured using DSO.
  5. The procedure above is repeated for sample & hold and flat top sampling.

Tabular Column:

SIGNAL AMPLITUDE (V) TIME FREQ(HZ) PERIOD (S) I/P Signal

Clock Signal

O/P a) Natural Sampling

b) Sample hold

c) Flat top sampling

Fig. 1.1 Block Diagram for Natural Sampling

Fig. 1.2 Block Diagram for Sample and Hold

Fig. 1.3 Block Diagram for Flat Top Sampling

EXP. NO :2 GENERATION AND DETECTION OF AMPLITUDE

DATE: MODULATION

Aim:

To study an amplitude modulation & demodulation circuit and to calculate modulation index of AM.

Apparatus Required:

  1. AM transmitter and receiver kit
  2. Digital Storage Oscilloscope (DSO)
  3. Power supply
  4. Patch cords

Procedure:

  1. The connections are given as per the block diagram.
  2. Set the modulating signal frequency at 1KHz and carrier signal frequency at 500Khz
  3. Vary the amplitude of the modulating signal and check for the three following conditions a. Modulation index (m) lesser than 1 b. Modulation index (m) equal to 1 c. Modulation index (m) greater than 1

Block Diagram

Fig. 2.1 Block Diagram for AM Modulation and Demodulation

MODEL GRAPH

Fig 2.1 Model Graph for AM Modulation and demodulation.

EXP. NO:

GENERATION AND DETECTION OF FREQUENCY

Date :

Aim:

MODULATION

To study frequency modulation & demodulation and to calculate modulation index of FM.

Apparatus Required:

  1. FM transmitter and receiver kit
  2. Digital Storage Oscilloscope (DSO)
  3. Power supply
  4. Patch cords

Procedure:

  1. The connections are given as per the block diagram.
  2. Set the modulating signal frequency at 1KHz and carrier signal frequency at 500Khz
  3. Vary the frequency of the modulating signal and check for the three following conditions a. Modulation index (m) lesser than 1 b. Modulation index (m) equal to 1 c. Modulation index (m) greater than 1

Tabulation:

Message Frequency = Carrier Frequency =

S.NO Am TL TH FL FH Freq.Deviation %M

Block Diagram

Fig 3.1 Block diagram for FM modulation and demodulation

Model Graph

Fig 3.2 Model Graph for FM modulation and demodulation

Result:

Frequency Modulation and Demodulation are verified in the hardware kit and its waveforms are analyzed for different modulation index.

Block Diagram

Fig. 4.1 Block Diagram for PCM Modulation and Demodulation

Model Graph

Result:

Pulse Code Modulation and Demodulation are verified in the hardware kit and its waveforms are studied.

EXP. NO:5a

DATE:

DELTA MODULATION AND DEMODULATION

Aim:

To study the characteristics of delta modulation and demodulation kit.

Apparatus Required:

  1. Delta modulation and demodulation Kit
  2. Digital Storage Oscilloscope (DSO)
  3. Power supply
  4. Patch cords

Procedure:

  1. The connections are given as per the block diagram.
  2. Connect power supply in proper polarity to kits DCL-07 and switch it on.
  3. Keep the Switch S2 in Delta position.
  4. Keep the Switch S4 High.
  5. Observe the various tests points in delta demodulator section and observe the reconstructed signal through 2

nd order and 4

th order filter.

TABULATION

AMPLITUDE TIME PERIODFREQUENCY

Message Signal

Digital Sampler O/P

Integrator -3 O/P

Filter O/P

EXP. NO:5b

ADAPTIVE DELTA MODULATION &DEMODULATION

DATE:

Aim:

To study the characteristics of adaptive delta modulation and demodulation kit.

Apparatus Required:

  1. Delta modulation and demodulation Kit
  2. Digital Storage Oscilloscope (DSO)
  3. Power supply
  4. Patch cords

Procedure:

  1. The connections are given as per the block diagram.
  2. Connect power supply in proper polarity to kits DCL-07 and switch it on.
  3. Keep the Switch S2 in sigma delta position.
  4. Keep the Switch S3 High.
  5. Observe the various tests points in demodulator section and observe the reconstructed signal through 2

nd order and 4

th order filter.

Tabulation

AMPLITUDE TIME PERIODFREQUENCY

Message Signal

Digital Sampler O/P

Integrator -3 O/P

Filter O/P

BLOCK DIAGRAM

Fig 5.1b Block diagram for Adaptive delta modulation and demodulation

EXP. NO :

BFSK MODULATION AND DEMODULATION

DATE:

Aim:

To study the characteristics of Binary Frequency Shift keying (BFSK) modulation and demodulation.

Apparatus Required:

  1. BFSK Modulation (DCL-05) and demodulation kit (DCL-06)
  2. Digital Storage Oscilloscope (DSO)
  3. Power supply
  4. Patch cords

Procedure:

  1. The connections are given as per the block diagram.
  2. Connect the power supply in proper polarity to the kit and & switch it on.
  3. Set the amplitude of the sine wave as desired.
  4. Observe the waveforms at the a. Clock b. SIN 1 & SIN 2 c. MODULATOR OUTPUT d. FSK OUT and plot it on graph paper

Tabulation:

SIGNAL AMPLITUDE (V) TIME PERIOD (s) Frequency(Hz) Clock Signal Input 1 Input Modulator Output Demodulated Output

Block Diagram:

Fig 6.1 Block diagram for Frequency Shift Keying

Model Graph:

RESULT

BFSK Modulation and Demodulation are verified in the hardware kit and its waveforms are studied.