Digital Communication Trainers

Features:

• Provides Sine waveform output of 250Hz, 500Hz, 1 KHz, and 2 KHz with
• Amplitude adjustments of 0 - 5Vp-p
• Switch selectable sampling clock of 4, 8, 16, 32 KHz.
• On-board features Analog Sample Circuit/Output, Sample & Hold Circuit/Output, Flat Top Circuit/Output
• 4th order Butterworth Low pass filter with cut off frequency of 3.4 KHz.
• PAM, PWM,PPM modulation & demodulation

Features:

• Provides Sine waveform output of 250Hz, 500Hz, 1 KHz, and 2 KHz. With Amplitude adjustments of 0 - 5Vp-p.
• On board 0 to 5V DC source with Amplitude adjustments.
• Sampling rate of 32 KHz/channel with 8KHz. Channel Identification Signal.
• On-board features Four Analog Channels TDM Multiplexing/De-multiplexing
• Clock regeneration at receiver using PLL.
• 4th order Butterworth Low pass filter with cut off frequency of 3.4 KHz.

Features:

• Receiver clock generated using PLL method
• Data Format (Decoding) using NRZ-L technique
• Tribit Decoded data (I ,Q & C)
• Differential Decoded I & Q Bits.
• Carrier Demodulation Techniques using QAM,DQAM Demodulation
• On-board features QAM/DQAM Demodulation using PLL and Envelop detectors.

Features:

• Provides Synchronized Sine waveform output of Frequency 1 KHz & 2 KHz.
• With Amplitude adjustments of 0-5V p-p
• Switch selectable sampling frequency of 2,4,8,16,32 KHz.
• Provision for External sampling Input up to 40 KHz with amplitude of 5V.
• On-board features Sample Circuit/Output, Sample & Hold Circuit/Output
• Switch selectable Sampling Duty cycle of 0-90% in steps
• 2nd & 4th order Low pass filter with cut off frequency of 3.4 KHz.

Features:

• Provides Sine waveform output of 500Hz, 1 KHz with Amplitude adjustments of 0 - 5Vp-p.
• Two Nos. of variable DC source with Amplitude adjustments.
• Mode of Operation Fast (240 KHz/Channel approx) & slow (1Hz. /channel approx.)
• 2 Channel Time Division multiplexed Pulse Code Modulation Transmitter.
• None, Even, Odd, Hamming Parity selections
• Pseudo random sync. Code generator for FRAME Synchronization.
• PLL for Bit synchronization.

Features:

• 2 Channel Time Division demultiplexed Pulse Code Modulation Receiver.
• Mode of Operation Fast (240 KHz/Channel approx) & Slow (1Hz. /channel approx.)
• 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
• None, Even, Odd, Hamming Parity selections
• Two Nos. of 4th order Butterworth Low pass filter with cut off frequency of 3.4 KHz.

Features:

• Provides Synchronized Sine waveform output of 250Hz, 500Hz, 1 KHz and 2 KHz with Amplitude adjustments of 0 - 4Vp-p.
• Switch selectable sampling clock of 8, 16, 32,64 KHz.
• Modulation & Demodulation Techniques using Delta modulation, Sigma Delta modulation, Adaptive Delta modulation, CVSD modulation
• On-board m-law Compander and Expander
• 2nd & 4th order Butterworth Low pass filter with cut off frequency of 3.4 KHz.

Features:

• 8 bit variable NRZ-L pattern Data Simulator using 8 way DIP Switch.
• Carrier Generator generating frequency of 2MHz (0°), 1MHz (0°) & 1MHz (180°)
• Data Format (Coding) using NRZ(Level), NRZ(Mark), NRZ(Space), Biphase (Manchester), Biphase (Mark), Biphase (Space), URZ, AMI.
• Carrier Modulation Techniques using ASK modulation, FSK modulation, PSK modulation
• On-board features of Uni-polar to Bipolar conversion, Bipolar to Uni-polar conversion.

Features:

• Data Format (De-Coding) using NRZ(Level), NRZ(Mark), NRZ(Space), Bi-phase (Manchester), Bi-phase (Mark), Bi-phase (Space), URZ, AMI.
• Carrier Demodulation Techniques using Rectifier Diode for ASK modulation, PLL Detector for FSK modulation, Square Loop Detector for PSK modulation
• On-board features Receiver Clock generated using PLL

Features:

• 8 bit variable NRZ-L pattern Data Simulator using 8 way DIP Switch.
• Data Format (Coding) using NRZ(Level), NRZ(Mark), NRZ(Space), Biphase (Manchester), Biphase (Mark), Biphase (Space), URZ, AMI.
• On-board features of Uni-polar to Bipolar conversion, Bipolar to Uni-polar conversion.
• Data Format (De-Coding) using NRZ(Level), NRZ(Mark), NRZ(Space), Bi-phase (Manchester), Bi-phase (Mark), Bi-phase (Space), URZ, AMI.
• On-board features Receiver Clock generated using PLL

Features:

• Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(180 deg.)
• On board 8 bit variable NRZ-L pattern Data Simulator using 8 way DIP switch.
• Clock frequency of 250 KHZ
• Data Format (Coding) of NRZ-L & Differential Encoded NRZ-L.
• Carrier Modulation Techniques using BPSK, DPSK, DEPSK modulation
• On-board features Square Looping Technique used in Demodulation section
• Carrier Demodulation Techniques using BPSK, DPSK & DEPSK Demodulation

Features:

• On board 8 bit variable NRZ-L pattern Data Simulator using 8 way DIP switch.
• Clock frequency of 250 KHZ .
• Provides synchronized Sine waveform output of 500KHz(0 deg.), 500KHz(90 deg.), 500KHz(180 deg.), 500KHz(270deg.)
• Data Format (Coding) using NRZ-L technique
• Dibit Pair (I & Q), Differential Encoding of I & Q Bits.
• Carrier Modulation Techniques QPSK, DQPSK modulation

Features:

• Data Format (De-Coding) using NRZ-L technique
• Dibit Pair (I & Q), Differential Encoding of I & Q Bits.
• Carrier Demodulation Techniques using QPSK, DQPSK Demodulation
• On-board features of Receiver Clock generated by PLL method

Features:

• 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 using 8 way DIP Switch.
• Clock Frequency is of 250 KHz.
• Data Format (Coding) using NRZ-L technique
• Tribit encoded data I , Q & C
• Differential Encoded I & Q Bits.
• Carrier Modulation Techniques using QAM, DQAM Modulation

Features:

• Provides Sine waveform output of 500 Hz with variable Amplitude of max.0-4Vp-p.
• On board Clock of frequencies 64 KHz, 128 KHz, 256 KHz and 512KHz
• Sampling Clock Frequency of 16 KHz and Amplitude of 5V
• On-board Block features DPCM modulation using sampler, quantizer and linear predictor, Buffer is provided using LF353
• DPCM demodulation using linear predictor, Integrator and Low pass Filter

Features:

• On Board synchronized RF carrier signal generators with frequencies of 120 KHz, 200 KHz.
• 8 bit Digital Data generator to generate any binary input word using 8-way DIP Switch
• On board two Balanced Modulator Circuit
• On board Demodulator PLL Detector Circuit