The trainer provides all necessary inputs and connections for students to study Pulse Amplitude Modulation/ Demodulation techniques. Time Division Multiplexing & Demultiplexing of Signals and Signal Reconstruction.

Technical Specifications

• Crystal Frequency : 8 MHz
• Analog Input Channels : 4
• Multiplexing : Time Division Multiplexing
• Modulation : Pulse Amplitude Modulation
• On Board Analog Signal : 500 Hz, 1 KHz, 2 KHz and 4 KHz (Sine wave synchronized to sampling pulse) Adjustable amplitude and separate variable DC level)
• Sampling Rate : Four sampling signals 4 KHz / 8 KHz / 10 KHz / 20 KHz per channel (switch selectable)
• Sampling Pulse : With duty cycle variable from 0-90% in decade steps.
• Clock Regeneration at Receiver : Using PLL
• Test points : 50
• Interconnections : 2 mm Sockets
• Power Supply : 220 V ±10%, 50 Hz / 60 Hz on request
• Power Consumption : 4 VA (approx.)
• Dimensions (mm) : W 340 × D 240 × H 105
• Weight : 1.3 Kg (approx.)
  • Crystal controlled clock
  • On-board sine wave generator (synchronized)
  • On-board pulse generator
  • 4 Analog input channels sampled and time division multiplexed
  • Four switch selectable sampling frequencies
  • Pulse duty cycle selectable
  • Internal/External sampling selectable 4 Channel De-multiplexer
  • Generation of clock at receiver by PLL System
  • 4th Order Butterworth L.P. Filter

Experiments that can be performed

1. Pulse Amplitude Modulation technique
2. Time Division Multiplexing and Demultiplexing
3. PLL as Frequency Multiplier to generate clock from sync signal
4. 3 modes of operation to regenerate original signal
   1. 3 connections between transmitter & receiver (Clock, sync & information)
   2. 2 connections (information, sync) Clock regenerated at receiver
   3. 1 connection (information only) Clock and sync derived at receiver
5. Effect of varying duty cycle of Sampling Pulse on signal reconstruction
6. Effect of different sampling frequencies on TDM-PAM & Demod technique