K-19 QPSK MODULATOR AND DEMODULATOR

Objective:
• 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 90o phase shift between in phase and quadrature carrier.
• To study the quadrature amplitude modulator and modulated waveform
• To study the demodulated waveforms

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

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