ADVANCE DIGITAL COMMUNICATION LAB

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1 Model Series TCM 002 Recent advances in wideband communication channels and solid-state electronics have allowed scientists to fully realize its advantages and thereby helping digital communications grow quickly. Digital communications is quickly edging out analog communication because of the vast demand to transmit computer data and the ability of digital communications to do so. With the help of Sci-tech Advanced Digital Communication Trainer Kits, Series TCM 002 Series, accompanied with necessary signal generators on-board and built-in power supply, ample experiments can be performed using the exhaustive manual. Test Points to analyze different signals are provided in the kits.

2 BPSK/DPSK & DEPSK MODULATION/ DEMODULATION KIT Model TCM Carrier Sine Wave Generator - Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(180 deg.) Clock And Data Generator - 8 bit variable NRZ-L pattern generated depending on the position of the 8-dit Data Switch provided. - Clock Frequency is of 250 KHz. Data Format (Coding) - Non Return to Zero-Level (NRZ-L) - Differential Encoded NRZ-L. Carrier Modulation Techniques - BPSK modulation - DPSK modulation - DEPSK modulation On-board features - Square Looping Technique used in Demodulation section - Switch Faults are provided on board to study different effects on circuit - Block Description Screen printed on glassy epoxy PCB Interconnections - All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICS are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication Attractive Wooden enclosures of Light weight Australian Pine Wood. Set of 2mm Patch cords for interconnections User s Manual with sample experimental programs LIST OF EXPERIMENTS

3 Principles of advance digital modulation techniques. Differential Encoding of Data. Binary Phase Shift Keying Modulation / Demodulation technique. Differential Phase Shift Keying Modulation / Demodulation Differentially Encoded technique. Phase Shift Keying Modulation / Demodulation technique. QPSK Effect & DQPSK of Switch MODULATION Faults. KIT Model TCM Sine Wave Generator - Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(90 deg.), 500KHz(180 deg.), 500KHz(270deg.) - Amplitude of 0-4Vp-p - Provision for Amplitude adjustments provided. Data Format (Coding) - Dibit Pair (I & Q), Differential Encoding of I & Q Bits. Carrier Modulation Techniques - DPSK modulation - DQPSK modulation Pulse Generator - Clock frequency of 250 KHZ BIT, BIT Clock, Word Clock. - Crystal Controlled Pulse Generator. On-board features - On board 8 bit variable NRZ-L pattern Data Simulator - Switch Faults are provided on board to study different effects on circuit - Block Description Screen printed on glassy epoxy PCB Interconnections - All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICS are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication Attractive Wooden enclosures of Light weight Australian Pine Wood. Set of 2mm Patch cords for interconnections

4 User s Manual with sample experimental programs LIST OF EXPERIMENTS Principles of advance digital modulation and Demodulation techniques. Dibit pair data coding technique of NRZ-L data format. Differential Encoding of I & Q Bits. Observation of constellation diagram. Quadrature Phase Shift Keying Modulation and Demodulation technique. Differential Quadrature Phase Shift Keying Modulation and Demodulation technique. Effect of Switch Faults.

5 QPSK / DQPSK DEMODULATION KIT Model TCM Data Format (De-Coding) - Dibit Pair (I & Q), Differential Encoding of I & Q Bits. Carrier Demodulation Techniques - DPSK Demodulation - DQPSK Demodulation On-board features - Receiver Clock generated by PLL method - Switch Faults are provided on board to study different effects on circuit - Block Description Screen printed on glassy epoxy PCB Interconnections - All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICS are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication Attractive Wooden enclosures of Light weight Australian Pine Wood. Set of 2mm Patch cords for interconnections User s Manual with sample experimental programs LIST OF EXPERIMENTS List of experiments are same for both ADCT-02 and ADCT-03. ADCT-02 and ADCT-03 are combined to perform the experiments

6 BASE BAND DIGITAL TRANSMISSION TRAINER Model TCM Noise Generator - Provides White Noise Source output - Amplitude of 0-4Vp-p - Provision for Amplitude adjustments provided. PRBS Generator - 16 Bit switch selectable - Jumper selectable clock rate of 16, 32, 64, 128, 256, 512 KHz, and MHz. BIT ERROR RATE Meter - Four digit counter displayed on seven segment - Four digit seven segment counting up to LED for terminal count indication provided Digital Modulation Technique - Pulse Amplitude Modulation technique is used - Internal sampling clock: of 16 KHz to 1MHz - 50 % duty cycle Coding Operation - 16 bit data pattern for scrambler - 16 bit data pattern for unscrambler On-board features - Switch Selectable first order Butterworth Transmitter filter (Five Bands) - Switch Selectable first order Butterworth Receiver filter (Five Bands) - Switch Faults are provided on board to study different effects on circuit - Block Description Screen printed on glassy epoxy PCB Interconnections - All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICS are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication Attractive Wooden enclosures of Light weight Australian Pine Wood.

7 Set of 2mm Patch cords for interconnections User s Manual with sample experimental programs LIST OF EXPERIMENTS Study of pulse amplitude modulation of digital datas for base band transmission. Study of data extraction and recovery in base band digital transmission. Study of transmission and reception of band limited pulse train in base band digital transmission system. Study of eye pattern. Observation and calculation of noise margin percentage. Measurement of bit error rate using binary data. Study of message Scramblers and Unscramblers. Effect of Switch Faults.

8 QAM/DQAM MODULATION TRAINER. Model TCM Carrier Sine Wave Generator - Four carrier sine waves Generated onboard - Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(90 deg.), 500KHz(180 deg.),500khz(270 deg.) Clock And Data Generator - 24 bit variable NRZ-L pattern generated depending on the position of the three nos. of 8-dit Data Switch provided. - Clock Frequency is of 250 KHz. Data Format (Coding) - Non Return to Zero-Level (NRZ-L) - Tribit encoded data (I,Q & C) - Differential Encoded I & Q Bits. Carrier Modulation Techniques - Quadrature Amplitude Modulation - Differentially Quadrature Amplitude Modulation On-board features - On board Three Nos. of 8 bit variable NRZ-L pattern Data Simulator - Switch Faults are provided on board to study different effects on circuit - Block Description Screen printed on glassy epoxy PCB Interconnections - All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICS are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication Attractive Wooden enclosures of Light weight Australian Pine Wood. Set of 2mm Patch cords for interconnections User s Manual with sample experimental programs

9 LIST OF EXPERIMENTS To study the elements of 8-QAM / DQAM system. Tribit coding technique of NRZ-L data format. Differential Encoding of Data. 8-QAM Modulation technique. DQAM Modulation technique. To study of constellation Diagram of QAM To study bandwidth efficiency in QAM techniques Effect of Switch faults.

10 QAM/DQAM DEMODULATION TRAINER.. Model TCM Receiver Clock - Receiver clock generated using PLL method Data Format (Decoding) - Non Return to Zero-Level (NRZ-L) - Tribit Decoded data (I,Q & C) - Differential Decoded I & Q Bits. Carrier Demodulation Techniques - Quadrature Amplitude Demodulation - Differentially Quadrature Amplitude Demodulation On-board features - QAM/DQAM Demodulation using PLL and Envelop detectors - Switch Faults are provided on board to study different effects on circuit - Block Description Screen printed on glassy epoxy PCB Interconnections - All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICS are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication Attractive Wooden enclosures of Light weight Australian Pine Wood. Set of 2mm Patch cords for interconnections User s Manual with sample experimental programs LIST OF EXPERIMENTS To study Tribit decoding technique. To study Differential decoding of Data. Observation of constellation diagram. To study bandwidth efficiency of 8-QAM/DAQM. To study 8-QAM Demodulation technique.

11 To study DQAM Demodulation technique. To study Effect of Switch faults. DPCM/ADPCM MODULATION & DEMODULATION TRAINER Model no TCM Features Receiver Clock generated by PLL method Demodulation is done using PLL and Envelop Detector Method Switch faults are provided to study its effects on circuits Block Description screen printed on PCB In-Built Power Supply Specifications Sine Wave Generator Provides Sine waveform output using IC Frequency of Sine wave is 500 Hz with variable Amplitude of max.0-4vp-p Data Clock Generator Jumper selectable clock with amplitude of 5V. Clock of frequencies 64 KHz, 128 KHz, 256 KHz and 512KHz. Sampling Clock Sampling Clock is generated using IC Sampling Clock Frequency of 16 KHz and Amplitude of 5V.

12 On-board Block features DPCM modulation using sampler, quantizer and linear predictor. Onboard Buffer is provided using Lf353. DPCM demodulation using linear predictor, Integrator and Low pass Filter. On-board Low pass filter using Tl084. Block Description Screen printed on glassy epoxy PCB. Interconnections All interconnections are made using 2mm banana Patch cords. Test points are provided to analyze signals at various points. All ICs are mounted on IC Sockets. Bare board Tested Glass Epoxy SMOBC PCB is used. In-Built Power Supply of +5V/150mA, ±12V/250mA with Power ON indication. Attractive Wooden enclosures of Light weight Australian Pine Wood. S e t o f 2mm P a t c h c o r d s f o r interconnections User's Manual with sample experimental programs. LIST OF EXPERIMENTS - To study DPCM modulation and Demodulation. - To study ADPCM modulation and Demodulation. - To study Quantization Error. - To study voice communication for DPCM/ADPCM (Optional). - To study Effect of Switch faults.

13 MSK MODULATION AND DEMODULATION KIT Model TCM Features Carrier Generator On Board synchronized RF carrier signal generators with frequencies of 120 KHz, 200 KHz Data Generator 8 bit Digital Data generator to generate any binary input word. Selection of Data using 8-way DIP Switch. Display One LED indicator to indicate Power input. On board circuits On board two Balanced Modulator Circuit. Demodulator PLL Detector Circuit. Squarer Circuit Power Supply Fixed DC power supply : + 5 V/500mA Fixed DC power supply : +/-12 V/500mA

14 Interconnections All interconnections are made using 2mm banana Patch cords. Bare Board Tested Glass Epoxy PCB is used. Set of 2mm Patch cords for interconnections User Manual CRC CODING AND DECODING KIT Model TCM Features Pulse Generator One Switch to provide Low to High Pulse One Switch to provide High to Low Pulse Data Generator 8 bit Digital Data generator to generate any binary input word. Selection of Data using 8-way DIP Switch. Display One LED indicator to indicate Power input. On board circuits CRC Encoder/ Transmitter Circuit for 16 bits CRC Polynomials CRC Decoder/ Receiver Circuit for 16 bits CRC Polynomials. Data Receiver Circuit for 8 Data bits. Power Supply Fixed DC power supply : + 5 V/500mA

15 Interconnections All interconnections are made using 2mm banana Patch cords. Bare Board Tested Glass Epoxy PCB is used. Set of 2mm Patch cords for interconnections User Manual Specifications, Model Photos and design subject to changes without any notice

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