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User Manual for PAM PPM PWM Modulation and Demodulation

Introduction

PS-DC-PM is proposed to user friendly to process the experiments and the trainer had all internal features like message signal, carrier signal, power supply etc., and the trainer has online video demonstration on our website.

 

 

Technical Specification

  • Message Signal 1 : Frequency 500 Hz : Amplitude 0 to 5V
  • Message Signal 2 : Frequency 1 KHz : Amplitude 0 to 5V
  • Message Signal 3 : Frequency 2 KHz : Amplitude 0 to 5V
  • Carrier Signal (Square) : Frequency 8KHz, 16KHz, 32KHz, 64KHz : Amplitude 5V
  • Carrier Signal (Triangle) : Frequency 8KHz, 16KHz, 32KHz, 64KHz : Amplitude 2V
  • Modulator Type (PAM) : 74 HC 4053 Based (Switching)
  • Modulator Type (PPM) : IC 555 Based (Timer)
  • Modulator Type (PWM) : LM 311 Based (Comparator)
  • Demodulator : 4th Order LPF
  • Amplifier : Op-Amp Based
  • Supply Voltage (Board) : +12V, +5V / DC
  • Supply current : 100 mA (Minimum)
  • Input Voltage : 230 V/ 50 Hz AC
  • Interface connectors : 2mm socket

 

Features

  • On-board message signal with variable amplitude
  • Three different frequency message signal
  • On Board four different frequency carrier signal (Square)
  • On Board four different frequency carrier signal (Triangle)
  • Modulation using switching IC, Timer and Comparator
  • Demodulation using Low Pass Filter
  • Amplifier using Op-Amp
  • Internal Power Supply +5V , +12V/ 500 mA
  • Number of test point to study the Pulse Modulation system
  • User friendly front panel block diagram

 

Front Panel Diagram



BLOCK DIAGRAM

PAM Modulation





PPM Modulation





PWM Modulation





PAM/PPM/PWM Demodulation





EXPERIMENTAL SECTION

List of Experiments

 

Experiment 1:

To Study the PAM Modulation and Demodulation (Sample & Hold)

Experiment 2:

To Study the PAM Modulation and Demodulation (Natural Sampling)

Experiment 3:

To Study the PAM Modulation and Demodulation (Flat Top Sampling)

Experiment 4:

To Study the PPM Modulation and Demodulation

Experiment 5:

To Study the PPw Modulation and Demodulation

APPARATUS REQUIERED OF EXPERIMENTS

  • PAM/PPM/PWM Trainer : 1 No
  • Patch chord : 5 No’s
  • Power chord : 1 No
  • Manual : 1 No
  • CRO : 1 No

 

EXPERIMENT - 1: Pulse Amplitude Modulation and Demodulation (Sample and Hold)

Aim

To study the Pulse Amplitude Modulation and Demodulation in Sample and Hold.

Apparatus Required

  • PAM/PPM/PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • Square wave carrier signals at various frequencies (64 KHz, 32 KHz, 16 KHz, and 8 KHz) are available in carrier signal section.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Amplitude Modulator (P4 and P5) using patch chord.
  • The PAM is done and the modulated signal (Sample/Hold) can be tested using CRO with test point P6.
  • Patch the modulated signal in P6 with P15 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P16 and connects it with P17 point.
  • The final demodulated output is available at test point P18 and varies the pot meter to get amplified output.
  • Note down all waveforms.

 

Result

Thus, the Pulse Amplitude Modulation and Demodulation in Sample and Hold method was studied.

EXPERIMENT - 2: Pulse Amplitude Modulation and Demodulation (Natural Sampling)

 

Aim

To study the Pulse Amplitude Modulation and Demodulation in Natural Sampling

Apparatus Required

  • PAM/PPM/PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • Square wave carrier signals at various frequencies (64 KHz, 32 KHz, 16 KHz, and 8 KHz) are available in carrier signal section.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Amplitude Modulator (P4 and P5) using patch chord.
  • The PAM is done and the modulated signal (Natural Sampling) can be tested using CRO with test point P7.
  • Patch the modulated signal in P7 with P15 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P16 and connects it with P17 point.
  • The final demodulated output is available at test point P18 and varies the pot meter to get amplified output.
  • Note down all waveforms.

Result

Thus, the Pulse Amplitude Modulation and Demodulation in Natural Sampling was studied.

EXPERIMENT - 3: Pulse Amplitude Modulation and Demodulation (Flat Top Sampling)

 

Aim

To study the Pulse Amplitude Modulation and Demodulation in Flat Top Sampling.

Apparatus Required

  • PAM/PPM/PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • Square wave carrier signals at various frequencies (64 KHz, 32 KHz, 16 KHz, and 8 KHz) are available in carrier signal section.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Amplitude Modulator (P4 and P5) using patch chord.
  • The PAM is done and the modulated signal (Flat Top Sampling) can be tested using CRO with test point P8.
  • Patch the modulated signal in P8 with P15 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P16 and connects it with P17 point.
  • The final demodulated output is available at test point P18 and varies the pot meter to get amplified output.
  • Note down all waveforms.

 

Result

Thus, the Pulse Amplitude Modulation and Demodulation in Flat Top Sampling was studied.

EXPERIMENT 4: Study the PPM Modulation and Demodulation

Aim

To study the PPM Modulation and Demodulation

Apparatus Required

  • PAM/PPM/PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • Without message signal note down the carrier signal waveform at P5 test point.
  • Patch any one message to P13 test point and note down the PPM output at P14 test point.
  • For demodulation, Connect P14 and P15 test point using patch chord.
  • Now we get the LPF signal output at P16 test point.
  • Connect P16 and P17 test point using patch chord.
  • The final demodulated output is available at test point P18 and varies the pot meter to get amplified output.
  • Note down the all the waveforms.

 

Result

Thus, the PPM Modulation and Demodulation was studied.

EXPERIMENT - 5: Pulse Width Modulation and Demodulation

Aim

To study the Pulse Width Modulation and Demodulation

Apparatus Required

  • PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz, 16 KHz, 8 KHz) are available in carrier signal section.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Width Modulator (P9 and P10) using patch chord.
  • The Pulse width modulation is done and the modulated signal can be tested using CRO with test point P12.
  • Patch the modulated signal in P12 with P15 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P13 connect it with P14 test point
  • The final demodulated output is available at test point P18 and varies the pot meter to get amplified output.
  • Note down all the wave forms.

 

Result

Thus, the Pulse Width Modulation and Demodulation was studied.