K 19



  • To study the following experiment through AT89C51 using the Dataformats such as NRZ, RZ, and Manchester.
  • Quadrature Phase Shift Keying (QPSK) modulation & demodulation
  • To study the 90phase shift between in phase and quadrature carrier.
  • To study the quadrature amplitude modulator and modulated waveform
  • To study the demodulated waveforms

Features of the Trainer:

1. Modulator & Demodulator controller 89C51

  • Compatible with MCS-51™ Products
  • 4K Bytes of In-System Reprogrammable Flash Memory
  • Endurance: 1,000 Write/Erase Cycles
  • Fully Static Operation: 0 Hz to 24 MHz
  • Three-Level Program Memory Lock
  • 128 x 8-Bit Internal RAM
  • 32 Programmable I/O Lines
  • Two 16-Bit Timer/Counters
  • Six Interrupt Sources
  • Programmable Serial Channel
  • Low Power Idle and Power Down Modes
  • Reset Switch To Reset Both Controllers.

2. Carrier source:

  • Output Waveforms: Sine & Cosine

3. Data Selector Switch :

  • 8 bit data output

4. Mode selection : QPSK,NRZ, RZ, MANCHESTER

   Note: 4 LEDS are provided to observe the corresponding enabled mode.

5. Functional Block Diagram:

  • QPSK Modulation/Demodulation.

Specification :

Built it regulated power supply  DC +/- 12V/1A, +/- 5V /1A
Power Supply

Voltage range : AC 100V - 230V 
Frequency Range : 50 - 60Hz

Housing It is housed in an elegant metal cabinet(CNC Machine finish)
Dimension 45cm x 45cm x 18cm
Weight 6kgs


This trainer is a glass-epoxy printed circuit board and all the symbols screen-printed on the front panel so that it enables the student to conduct the experiments easily.


  • 2mm multi coloured moulded patch cords with daisying facility.
  • Computer simulated outputs and Step-By-Step detailed instructions are provided with the instruction manual.

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