TDM Pulse Amplitude Demodulation Transmitter Trainer

SALIENT FEATURES

• Crystal controlled Clock.
• On – Board Sine Generator (Synchronized).
• On – Board Pulse Generator.
• 4 Analog input Channels samples and Time Division Multiplexed.
• Pulse Duty cycle selected.
• 4 Channel De multiplexer.
• Generation of clock at Receiver by PLL system.
• 4th order Butterworth L.P. Filters.

TECHNICAL SPECIFICATIONS

•  Crystal Frequency : 6.4/8 MHz.
•  Analog Input channel : 4.
•  Multiplexing : Time Division Multiplexing.
•  Modulation : Pulse Amplitude Modulation.
•  On – Board Analog Signal :250 Hz, 500 Hz, 1 KHz, 2KHz 500 Hz, 1 KHz, 2KHz, 4KHz (optional).
•  Sampling Rate : 16 KHz / Channel.
•  Sampling Pulse : With Duty Cycle variable from 0 – 90% in decade steps.
•  Clock Resistance at Receiver : Using PLL.
•  Low Pass Filter cut – off Freq. : 3.4 KHz.
•  Fault Switches : 4 nos. through 4 way DIP switch for troubleshooting at different blocks.
•  Test Points : More than 50.
•  Interconnections : 2/4 mm socket.
•  Cabinet : Enclosed in ABS plastic cabinet with detachable cover.
•  Power : 220V AC ±10%, 50/60Hz mains operated.
•  Accessories : Set of Patch Cords, User’s manual.

LIST OF EXPERIMENTS

•  Pulse Amplitude Modulation technique.
•  Time Division Multiplexing and De multiplexing.
•  PLL as Frequency Multiplexer to Generate clock from Sync signal.
•  3 modes of operation to generate original signal.
•  3 connections between transmitter & receiver (Clock, Sync & Information).
•  2 connections (Information, Sync) Clock gen. at receiver.
•  2 connection (information only), clock and Sync derived at receiver.
•  Effect of varying duty of sampling pulse on signal reconstruction