Creating a niche of Digital Communication Trainers such as ACT-01-Analog Sampling-Reconstruction Kit, ACT-02-PAM-PWM-PPM-Modulation-Demodulation Kit, ACT-03-TDM-Pulse Amplitude Mod-Demod- Kit, ACT-04-TDM-Pulse Code Modulation Kit, ACT-05-TDM-Pulse Code Modulation KIT, ACT-06-Delta-Adaptive Delta-M-D-KIT and many more items at its best, with utmost quality.

ACT-01-Analog Sampling-Reconstruction Kit

Synchronized Sine waveform output of Frequency 1 KHz & 2 KHz.
Selectable sampling frequency of 2,4,8,16,32 KHz.
Sample circuit/output, sample & hold circuit/output
Switch selectable sampling Duty cycle of 0-90% in steps.
2nd & 4th order Low pass filter.


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ACT-02-PAM-PWM-PPM-Modulation-Demodulation Kit

Sine waveform output of 250Hz, 500Hz, 1 KHz, and 2 KHz
Selectable sampling clock of 4, 8, 16, 32 KHz.
Analog Sample Circuit/Output, Sample & Hold Circuit/Output, Flat Top Circuit/Output
PAM/PWM/PPM modulation & demodulation.
4th order Low pass filter.


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ACT-03-TDM-Pulse Amplitude Mod-Demod- Kit

Sine waveform output of 250Hz, 500Hz, 1 KHz, and 2 KHz
Sampling rate of 32 KHz/channel, 8KHz. Channel Identification Signal.
DC source for Amplitude adjustments provided.
Four analog input channels for multiplexing/de-multiplexing.
Clock regeneration at receiver using PLL.
4th order Butter worth Low pass.


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ACT-04-TDM-Pulse Code Modulation Kit

Sine waveform output of 500Hz, 1 KHz
Two Nos. of variable DC source with Amplitude adjustments.
Fast (240 KHz/Channel approx)/ Slow (1Hz. /channel approx.).
Two Nos. of Input Channels..
Pseudo random sync. Code generator for FRAME Synchronization. .
PLL for Bit synchronization.


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ACT-05-TDM-Pulse Code Modulation KIT

2 Channel TDM Pulse Code Modulation Receiver.
Pseudo random sync. Code generator for FRAME Synchronization.
Receiver clock generation using PLL
Error Detection of None, Even, Odd, Hamming.
Error Correction using Hamming Code technique.
Two Nos. of 4th order butter worth Low pass filter .


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ACT-06-Delta-Adaptive Delta-M-D-KIT

Sine waveform output of 250Hz,500Hz, 1 KHz and 2 KHz
Switch selectable sampling clock of 8, 16, 32,64 KHz.
Delta modulation, Adaptive Delta modulation, CVSD modulation
M-law Com pander and Expander .
2nd & 4th order Butter worth Low pass filter.


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ACT-7T-Data Conditioning Kit

Carrier Generator generating frequency of 2MHz (0°), 1MHz (0°) & 1MHz (180°)
NRZ(Level), NRZ(Mark), NRZ(Space), Biphase (Manchester), Biphase (Mark), Biphase (Space), URZ, AMI.
ASK modulation, FSK modulation, PSK modulation
Uni-polar to Bipolar conversion & Bipolar to Uni-polar conversion.


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ACT-7R-Data RE-Conditioning KIT

NRZ(Level), NRZ(Mark), NRZ(Space), Bi-phase (Manchester), Bi-phase (Mark), Bi-phase (Space), URZ, AMI.
Rectifier Diode for ASK modulation, PLL Detector for FSK modulation,Square Loop Detector for PSK modulation .
Receiver Clock generated using PLL


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ADCT-02-QPSK-DQPSK Modulation Kit

Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(90 deg.), 500KHz(180 deg.), 500KHz(270deg.).
Digit Pair (I & Q), differential encoding of I & Q bits.
DPSK modulation, DQPSK modulation.
Clock frequency of 250 KHZ BIT, BIT clock, word clock.
On board 8 bit variable NRZ-L pattern data simulator.


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ADCT-03-QPSK-DQPSK Modulation Kit

Dibit Pair (I & Q), differential encoding of I & Q bits.
DPSK Demodulation, DQPSK demodulation.
Receiver Clock generated by PLL method.


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ADCT-04-Base Band Digital Transmission Trainer

Provides White Noise Source output.
selectable clock rate of 16, 32, 64, 128, 256, 512 KHz, and 1.024 MHz.
Four digit counter displayed on seven segment for BER measurement.
Four digit seven segment counting up to 9999 with LED for TC.
Pulse Amplitude Modulation technique is used .
Internal sampling clock: of 16 KHz to 1MHz.
16 bit data pattern for scrambler/ unscrambler.


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ADCT-05-QAM-DQAM Modulation Trainer

Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(90 deg.), 500KHz(180 deg.),500KHz(270 deg.).
24 bit variable NRZ-L pattern generated depending on the position of the three nos. of 8-dit Data Switch provided.
Non Return to Zero-Level (NRZ-L), Tribit encoded data (I ,Q & C), Differential Encoded I & Q Bits.
Quadrature amplitude modulation, differentially quadrature amplitude modulation.


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ADCT-06-QAM-DQAM Modulation Trainer

Receiver clock generated using PLL method.
Non Return to Zero-Level (NRZ-L), Tribit Decoded data (I ,Q & C), Differential Decoded I & Q Bits.
Quadrature amplitude demodulation, differentially quadrature amplitude demodulation .
QAM/DQAM demodulation using PLL and envelop detectors.


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ADCT-07-DPCM-ADPCM Modulation-Demodulation Trainer

Provides Sine waveform output using IC 74164.
Clock of frequencies 64 KHz, 128 KHz, 256 KHz and 512KHz.
Sampling Clock Frequency of 16 KHz and Amplitude of 5V.
DPCM modulation using sampler, quantizer and linear predictor.
DPCM demodulation using linear predictor, Integrator and Low pass Filter.


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ADCT-01-BPSK-DPSK Modulation-Demodulation KIT

Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(180 deg.).
8 bit variable NRZ-L pattern generated depending on the position of the 8-dit Data Switch provided.
Non Return to Zero-Level (NRZ-L).
BPSK modulation, DPSK modulation, DEPSK modulation.
Square Looping Technique used in Demodulation section.


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Mr. Ajit Unnithan (Director)
B - 4, Lotus C. H. S., Near P. M. C. Bank, Sector - 7, Airoli
Mumbai, Maharashtra - 400 708, India
Telephone: +(91)-(22)-65116548/ 27694323/ 65126767