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| Digital Communication Lab |
| Group of Digital Communication Trainers |
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DPCM Modulation
and Demodulation |
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PSK Modulation and Demodulation |
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ASK Modulation and Demodulation |
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PSK Modulation and Demodulation |
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The trainer provides all necessary inputs and connections for students to study about PSK modulation and demodulation techniques.
Features:
On board modulation & demodulation circuits.
Selectable modulating signal (data clock outputs D1, D2, D3, D4)
On board Carrier signal generator.
Built in DC power supply.
Technical Specifications:
On board modulating signal generator: different frequencies of data strem (square wave) D1, D2, D3, D4.
On board carrier signal genrator: synchronizefd sine wave to transmitted data strem at 10 KHz.
Carrier modulation: PSK
Demodulation: corresponding data stream
Teat points: 7
Inter connections: 4mm sockets.
Power 230V+/- 10%, 50 KHz.
Dimensions: W330, H80, D200
Weight: 2 kgs
Accessories included: manual, patch cords.
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PSKModulationand Demodulation |
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ASK Modulation and Demodulation |
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The trainer provides all necessary inputs and connections for students to study about ASK modulation & demodulation techniques.
Features:
Onboard modulation & demodulation circuits.
Onboard carrier generation circuits (since waves) of different fixed frequencies 1 MHz, 750 KHz, & 500 KHz.
On board modulation signal (data clock) with duty cycle variation.
Onboard variable carrier offset adjustment.
Onboard variable modulation offset adjustment.
Onboard variable carrier gain adjustment.
Onboard rectifier and low pass filter circuits for ASK demodulation.
Onboard data squaring circuits & deferential decoders for ASK demodulation.
Technical Specifications:
On board modulating signal generator: data stream (square wave) with ON/OFF period variation.
Onboard carrier generator: synchronized sine wave to transmitted data stream at 1 MHz, 750MHz, and 500KHz.
Carrier modulation: ASK carrier demodulation: ASK (by using rectifier diode).
Test points: 19
Inter connections: 4mm sockets:
Power : 230V+/- 10%, 50Hz
Dimenssion (mm): W330, H80, D200.
Weight: 2 Kg
Accessories included: manual, patch cords.
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ASK Modulation and Demodulation |
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PCM Modulation and Demodulation |
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The trainer provides all necessary inputs and connections for students to study about pulse code modulation and demodulation.
Features:
Onboard modulation & demodulation circuits.
Crystal controlled clock.
A-law PCM and linear encoding techniques
Onboard modulating signal generator (1KHz sine)
2 slelectable sampling rates (4 KHz and 8 KHz)
Built in variable DC power supply (-2.5V to +2.5 V)
Onboard 4th butter worth low pass filter.
Onboard LED data indication.
External inputer provision
Audio input provision for voice signals.
Quantization noise for 1 KHz sine input.
Technical Specifications:
Clock generation using micro controller
Low pass filters: butter worth 4th order filter cut off requency. 3.4 KHz.
Onboard modulating signal generator: 1 KHz sine wave with variable amplitude (3Vp-p).
Variable DC power supply: -2.5V to +2.5V
External input: maximum amplitude 5 Vp-p Minimum amplitude 50V of sine. Triangle and square waves Maximum frequency is 1 KHz.
Inter connections: 4 mm sockets.
Power: 230V+/- 10%, 50Hz.
Accessories included: 2 telephone instruments.
Operating manual: power cord patch cords.
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PCM Modulation and Demodulation |
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Delta Modulation and Demodulation |
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The trainer provides all necessary inputs and connections for students to study about delta modulation and demodulation techniques.
Features:
On board transmitter & receiver circuits.
Clock generation from crystal.
Switch selectable sampling rates.
Onboard modulation signal generator (2KHz).
Separate adjustable DC level.
Onboard 4th order butter worth low pass filter.
Onboard unipolar to bipolar conversion.
Technical Specifications:
Crystal frequency: 4.096 MHz
Sampling clock frequency.
Onboard generator: synchronized sine wave adjustable amplitude.
Demodulation: by using butter worth low pass filter (3.4KHz cutoff)
Test points: 13
Inter connections: 4mm sockets
Power: 230V+/-10%, 50Hz.
Dimensions (mm): W330, H80, D200
Weight: 2kg
Accessories included: manual, patch cords.
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Delta Modulation and Demodulation |
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DPCM Modulation and Demodulation |
- DIFFERENTIAL PULSE CODE MODULATION & DEMODULATION MODEL No. HIQ-4114
The trainer provides all necessary inputs and connections for students to study about differential pulse code modulation and demodulation.
Features:
Onboard modulation & demodulation circuits.
Crystal controlled clocks.
In built function generator (variable frequency 10Hz to 500 Hz sine wave.
Technical Specifications:
Clock generation using 2 MHz crystal
Low pass filter: bulter worth 4th order filter cut off frequency 1.5 KHz
Onboard modulating signal generator: 10Hz to 500Hz sine wave with 1V p-p amplitude
Inter conections: 4mm sockets
Power: 230V+/- 10%, 50Hz
Dimensions (mm): W330, H80, D200
Weight: 2 kg
Accessories included: manual, patch cords.
- DIFFERENTIAL PULSE CODE MODUALTION & DEMODULATION MODEL No. HIQ-4115
The trainer provides all necessary inputs and connections for student to study about differential pulse code modulation and demodulation.
Features:
Onboard modulation & demodulation circuits.
Crystal controlled clocks.
Inbuilt function generator (variable frequency 10Hz to 500 Hz sine wave).
Technical Specifications:
Clock generation using 2 MHz crystal
Low pass filter: butter worth 4th order filter cut off frequency 1.5 KHz
On board modulating signal generator: 10Hz to 500Hz sine wave with 1V p-p amplitude
Inter connections: 4mm sockets
Power: 230V+/- 10%, 50Hz.
Accessories included: operating manual, power cord patch cords.
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| DPCM Modulation and Demodulation |
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TDM Multiplexing and Demultiplexing |
- TIME DIVISION MULTIPLEXING & DEMULTIPLEXING MODEL No. HIQ-4116
TDM pulse amplitude modulation & demodulation trainer TDM – 3218 provides all necessary inputs and connections for students to study signal PAM/Demodulation techniques. Time division multiplexing and demultiplexing of signals and signal reconstruction.
Features:
Crystal controlled clock
Onbaord sine wave generator
Onboard pulse generator
4 Analog input channels sampled and time division
Multiplexing: 4
Onboard 4th order butter worth low pass filter
Onboardmultiplexing & demultiplexing
Onboard DC Supply
Technical Specifications:
Crystal frequency |
: 4.096 MHz |
Analog input channels |
: 4 |
Multilplexing |
: TDM |
Modulation |
: pulse amplitude modulation |
Onboard nalaong signal |
: 250Hz, 500Hz, 1KHz (sine Wave synchronized to sampling pulse adjustable amplitude and separate variable DC levels) |
Sampling rate |
: 16 KHz per channel |
Sampling Pulse |
: Duty cycle variable from 0 to 50% |
Low pass filter |
: 3.4KHz, 4th order butter worth |
Test points |
: 22 |
Power Requirement |
: 230V+/- 10%, 50Hz, 1-0 (in Circuit Board +/-12V & +5V) DC |
Inter connections |
: 4 mm Sockets |
Accessories |
: Instruction Manual fm power cardnine 4 mm connectors. |
Experiments Possible:
Study of 4 channel analog multiplexing and demultiplexing
Study of the effect of sampling frequency variation on the output.
Study of input signal amplitude on the output.
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| TDM Multiplexing and Demultiplexing |
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FSK Modulation and Demodulation |
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The trainer provides all necessary inputs and connections for students to study about FSK modulation & demodulation techniques and also provide to know about 5 different Data formats NRZ(L), RZ, NRZ(m), BI phase (mark), Biphase (Manchester)
Features:
Onboard modulation & demodulation ckts.
5 selectable different data formats NRZ(L), RZ, NRZ(M)
BI phase (mark), Biphase d (Manchester).
Inbuilt carrier generation.
FSK output is sine wave.
Demodulation by using PLL chip.
Technical Specifications:
Onboard data clock: astable mode (555IC)
Onboard data formatting ckt:5 selectable different data formats (NRZ (L), RZ, NRZ(M), Biphase (Mark) Biphase (Manchester).
Modulation: FSK sine wave output by using Xr2206
Demodulation: by using PLL chip.
Test points: 13
Inter connections: 4mm socket.
Power: 230 V+/- 10%, 50 Hz
Dimensions (mm): W330, H80, D200.
Weight: 2 Kgs.
Accessories included: manual, patch cords.
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DPSK Modulation and Demodulation |
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The trainer provides all necessary inputs and connections for student to study about DPSK modulation and demodualtion techniques.
Features:
Onboard modulation & demodulation ckts.
Onboard modulation signal (data clock outputs) D1, D2, D3, D4.
Onboard carrier generation circuit.
Onboard clock generation circuit.
Built in DC power supply
Technical Specifications:
Onboard modulating signal generator different Frequencies of data stream (square wave D1,D2,D3, D4)
On board carrier generator: synchronized sire wave to transmitted data stream at 1 KHz.
Carrier modulation: DFSK
Test points: 15
Inter connections: 4mm sockets
Power: 230 V+/- 10%, 50 Hz
Dimensions (mm): W330, H80, D200,
Weight: 2 Kgs
Accessories included: manual, patch cords.
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