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Communication Lab
 Home Products Communication Lab
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| We export a wide range of Communication Lab that further comprises of amplitude modulation/demodulation trainer, frequency modulation/demodulation trainer, digital fiber optic trainer with rs232c interface, analog fiber optic trainer kit and
Model : VMC-AFT, Fm transmitter/receiver trainer
Model : VMC-FMTR, analog signal sampling & reconstruction kit, pulse amplitude/width/position modulation kit, tdm pulse amplitude modulation/demodulation kit, pulse code modulation trainer kit, pulse code demodulation trainer kit, data conditioning/reconditioning kit, telephone trainer.
These communication labs are used for a large number of applications. Communication labs exported by by us are very advanced and competing world class level.
AMPLITUDE MODULATION/DEMODULATION TRAINER
MODEL : VMC-AM
Amplitude modulation/Demodulation Trainer gives the complete idea about modulation & demodulation of signal in terms of Amplitude. This is implemented by means of a variable transconductance four quadrant multiplier designed around CA3086. The Trainer has on board carrier and modulating signals along with power supplies. A detector and a low pass filter is provided to demodulate the signal, Modulation Index, Depth of Modulation etc.
Carrier Generator 100 KHz.
Modulating signal Generator at 1 KHz.
Amplitude Modulator & Demodulator.
+/-12V/350 mA DC Power Supply.
Housed in an attractive cabinet with cover.
Set of Patch Chords & Manual.
FREQUENCY MODULATION/DEMODULATION TRAINER
MODEL : VMC-FM
Frequency Modulation/Demodulation is accomplished using IC 8038 a function generator IC with built-in VCO. The trainer has on-board carrier and modulating signal with power supplies. The frequency Modulation/Demodulation trainer use PLL IC 565 to demodulate FM signal. Frequency deviation Modulation Index etc. are studied using this trainer.
+/-12V/350 mA DC Power Supply.
Carrier Generator 75 KHz.
Modulating signal Generator 10 KHz.
Frequency Modulator & Demodulator.
Housed in an attractive cabinet with cover.
Set of Patch Chords & Manual.
DIGITAL FIBER OPTIC TRAINER WITH RS232C INTERFACE MODEL : VMC-DFT
This trainer is for transmitting the digital signals & recover it. The trainer consisting onboard square wave generator using IC 555. The kit can transmit digital signal from the keyboard of one PC & Receive it on the monitor of another PC. This trainer is the best tool to understand the communication of digital signals using fiber optics cables.
Fiber Optic Digital Transmitter/Receiver Module
600nm or 850nm SMA Connectorised FO LED
RS 232C Driver using MAX-232-2 Nos.
Optical to Electrical & Electrical to Optical Converter
SMA Connectorised FO Photo Transistor
1Mtr. PMMA SMA FO Cable
RS232C cables for communication with PC (Optional).
Built in Power Supply
Set of Patch Chord & User Manual.
ANALOG FIBER OPTIC TRAINER KIT MODEL : VMC-AFT
The fiber optic trainer is for transmitting of Analog signals & recover it. The trainer consisting onboard sine wave generator, and variable DC source of range -5 to +5V. Using this trainer, students are able to understand the principle of transmission of analog signal & receiving it through fiber optic cable.
Fiber Optic Analog Transmitter and Receiver
600nm or 850nm SMA Connectorised FO LED
Optical to Electrical & Electrical to Optical Converter
SMA Connectorised FO Photo Transistor
1Mtr. PMMA (960/1000 u) SMA FO Cable
Built in Power Supply
Set of Patch Chord & User Manual.
FM TRANSMITTER/RECEIVER TRAINER
MODEL : VMC-FMTR
These trainers help to study the principle of Transmission & Reception of frequency-modulated signal. The kit has onboard Gang to tune different frequencies. Students can transmit the signals using particular bandwidth and receive it on receiver kit by tuning that bandwidth.
Based on IC CXA1691BS.
Separate trainers for transmitter & receiver.
Carrier Frequency : 88-108MHz.
Low current consumption.
Each section like Audio amplifier, FM modulator etc. is printed on board with test points.
Housed in attractive wooden cabinet.
In-built power supply.
Gain selectable by user.
Manual containing fault findings.
Set of Patch Chords & Manual.
ANALOG SIGNAL SAMPLING & RECONSTRUCTION KIT
MODEL : VMC-ASRK
This kit helps the students to understand the principle of Sampling of Analog signals. By reconstructing the sampled signals and comparing with original signal one can clear his idea about sampling & reconstruction.
Internal sine wave generator of 1KHz (5V P-P).
Sampling frequency of 2KHz, 4KHz, 8KHz, 16KHz & 32KHz.
Duty ratio of 10%-90% in 10% steps (switchable)
Onboard Sample & Hold circuit.
Ripple counter generating sampling frequencies of 20Hz to 20KHz.
Onboard low pass filters of 2nd order & 4th order.
Set of Patch Chord & User Manual.
All relevant Tests points are brought out to observe the signals at various points.
PULSE AMPLITUDE/WIDTH/POSITION MODULATION KIT MODEL : VMC-PAM/PWM/PPM
VPL’s PAM/PWM/PPM Modulation/Demodulation kit is a single board unit to provide facility for Experimentation in the area of Pulse modulation & Demodulation techniques such as PAM, PWM and PPM. Onboard sine wave generator provides four synchronized amplitude variable sine waves. The unit also accepts external sine wave frequency. This kit provides natural and flat top sampling with sample and hold outputs.
In this kit one can study Pulse amplitude, Pulse width, Pulse position Modulation/ Demodulation using natural sampling and flat top sampling. One can also perform voice communication using above pulse modulation and Demodulation techniques. This kit can be connected with other communication kits from VPL to perform related experiments. All the relevant test points are brought out onboard.
Complete circuit description onboard.
Sine wave generation of 250Hz, 500Hz, 1KHz & 2KHz with variable amplitude (0-4V).
Sampling Clocks of 4KHz, 8KHz, 16KHz & 32KHz with 50% duty cycle.
4th order Butter worth filter with cut off frequency of 3.4KHz.
Pulse amplitude/Width/Position Modulation & Demodulation.
PWM Modulator is designed using SG3524.
PPM Modulator is designed using IC 4098.
Pulse position Demodulation using OR gate and Flip Flop.
Onboard signals are phase locked to enable.
In built power supply
Set of Patch Chord & User Manual.
Tests points to observe the signals at various points
Audio amplifier (Optional).
PULSE CODE MODULATION TRAINER KIT MODEL : VMC-PCM
This trainer helps to study of Pulse Code Modulation techniques used in communication. The kit has onboard variable sine wave and DC level generator. This trainer can be used in two modes : Fast for Real time operation and Slow to examine data & control signals. In slow mode data can be examine through LED's provided onboard. Parity can be selected in this trainer. Various test points are provided for observation of signals. Using this trainer students can understand the principle of Analog to Digital conversion, Error generation, Time division multiplexing. The inbuilt power supply vanishes the hurdles of connecting separate power supply.
2 nos. of input channels
Onboard sine wave generator, generating frequencies of 500Hz, 1KHz with variable amplitude.
No parity, Even, Odd, Hamming parity selection.
Two modes of operation
Fast mode : For real time operation.
Slow mode : For examine data & control signals.
LED's are provided to examine data & control signals.
Pseudo random code generation.
In-built power supply.
Set of Patch Chords & Manual.
PULSE CODE DEMODULATION TRAINER KIT
MODEL : VMC-PCDM
This trainer helps to study of Pulse Code Demodulation techniques used in communication. Using this kit student can see the decoding of signal sent through pulse code modulation technique. The kit has low pass filters to reconstruct the modulated signals. This trainer can be used in two modes: Fast for Real time operation and Slow to examine data & control signals. In slow mode data can be examine through LED's provided onboard. Parity can be selected in this trainer. Various test points are provided for observation of signals. The inbuilt power supply vanishes the hurdles of connecting separate power supply.
2 nos. of input channels
Even, Odd, Hamming parity selection.
Two modes of operation
Fast mode : For real time operation.
Slow mode : For examine data & control signals.
LED's are provided to examine data & control signals.
Low pass filter having cut off frequency of 3.4 KHz.
Receiver Clock generated by PLL.
Test points are provided to observe the signals at various points.
In-built power supply.
Set of Patch Chords & Manual.
DELTA MODULATION/DEMODULATION TRAINER KIT MODEL : VMC-DM
This trainer helps to study of Delta & Adaptive Delta Modulation/ Demodulation techniques used in communication. The kit has onboard variable sine wave generator. Using mic & speaker voice communication can be done with this kit. Various test points are provided for observation of signals. The inbuilt power supply vanishes the hurdles of connecting separate power supply.
Modulation/Demodulation : Linear Delta, Adaptive Delta, CVSD.
Sampling frequency of 8KHz, 16KHz, 32KHz, 64KHz.
Onboard sine wave generator, generating frequencies of 250Hz, 500Hz, 1KHz, 2KHz with variable amplitude.
Onboard Compander & Expander.
Low pass butter worth filters of 2nd & 4th order having cut off frequency 3.4KHz.
Onboard Unipolar to Bipolar conversion.
Facility for interfacing external signals.
Voice communication using MIC & Speaker (Optional).
In-built power supply.
Set of Patch Chords & Manual.
EPABX TRAINER
MODEL : VMC-EPABX
VMC-EPABX is a single board EPABX TRAINING KIT configured around the most popular microcontroller 89C51. VMC-EPABX can be used to trained the Engineers about the architecture of EPABX. The kit has the capability of interfacing with an IBM compatible PC. The kit provides various powerful software commands like INSERT, DELETE, BLOCK MOVE, FILL, SET/CLR BREAKPOINTS etc.
VMC-EPABX gives the complete idea about the working of EPABX. Students can write own program for alter the working of EPABX by their own idea. This EPABX trainer also work as normal EPABX system to enable the students to understand the working of the systems which are using in the real world. This EPABX trainer have the provision to use 1, 2 or 3 trunk lines & 4, 6 or 8 extension lines respectively. Locking & other facilities are provided in this trainer same as normal EPABX.
This trainer can perform the following functions such as use the password to protect the call Extension to Extension call, Hold, Call transfer, Call pickup, Call parking, Call forwarding, Redial, Call control, Conference, Do not disturb etc.
Based on 89c51CPU.
Provision for up to 3 trunk Line & 8 extension lines.
IBM PC Compatible Keyboard for using commands.
20 x 2 LCD Display.
Complete circuitry of EPABX is on board.
Working in 2 Modes :
Trainer Mode
EPABX Mode
Explanation, Observation, Alignment and adjustment of internal & external controls is possible.
Program for different section can be written in RAM.
Programs written by user are executable.
Standard EPABX specification.
70dbm Cross Talk Attenuator.
Telephone Instruments (Optional).
Experiments perform on the trainer are :
Redial
Extension to Extension Call
Paging
To hold a line
Call consult
Call parking
all forwarding busy
Talk trunk to extension
Call pickup
Call transfer
Auto call back
Locking/Unlocking
Available Models :
VMC-EPABX 104 : 1 trunk line & 4 Extensions
VMC-EPABX 206 : 2 trunk line & 6 Extensions
VMC-EPABX 308 : 3 trunk line & 8 Extensions.
TELEPHONE TRAINER
MODEL : VMC-TT
The Telephone Trainer presenting by VPL is a complete kit to understand the working of telephone instruments with the idea of working of exchange. The trainer has DIP switches to create the faults in the instruments and test points to give the complete idea about the servicing/ working of telephone instrument.
Based on Basic Telephone Instrument Circuits.
16 Fault creating switches for different sections.
Circuit Diagram on board describing different sections in telephone like Line protector, Voltage dropper, Ringer, Dialer, Key matrix, Sound amplifier section etc.
Test points to measure the signals in different sections.
Can be use as normal telephone instrument.
User's manual with fault finding.
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