Pulse Amplitude Modulation/Demodulation Trainer

The unit is one of a range of digital communication trainers and provides all necessary inputs and connections for students to study pulse amplitude modulation / demodulation techniques, time division multiplexing and demultiplexing of signals and signal reconstruction.

Experiments:

• Study of pulse amplitude modulation technique
• Study of time division multiplexing and demultiplexing
• Study of PLL as frequency multiplier to generate clock from sync signal
• Study of effect of varying duty cycle of sampling pulse on signal reconstruction
• Study of 3 modes of operation to regenerate original signal
• 3 connections between transmitter and receiver (clock, sync & information)
• 2 connections (sync & information). Clock regenerated at receiver
• 1 connection (information only). Clock and sync derived at receiver

Key Features

• Crystal controlled Clock
• On-board signal generator (Synchronized) DC and Sine
• On-board pulse generator
• Demonstrates sampling and reconstruction as per Nyquist criterion
• 4 Analog input channels (TDM-PAM)
• Four switch selectable sampling frequencies
• Pulse duty cycle selectable
• Generation of clock at receiver by PLL system
• 4^th order Butterworth L. P. Filters