Model No.: HDCT-17800

Curriculum Outlines:
1. Design and implementation of CVSD encoder and decoder
2. Design and implementation of QPSK and QAM modulator and demodulator
3. Design and implementation of DSSS, BCH, and Convolutional codes encoder and decoder
4. Design and implementation of GMSK modulator and demodulator

Features:
1. To understand the basic theory of high-level digital communication.
2. Design and implementation ability training of digital modulator and demodulator.
3. Ability to research And develop the digital modulator and demodulator.
4. Familiar with the application of high-efficiency communication modulator circuit.

Specifications:
Module One: HDCT-17800-01
Chapter 1: CVSD Modulator
Sampling Frequency: 32 kHz - 50 kHz; Sampling Frequency Mode: TTL Level;
Audio Signal: 500 Hz - 1 kHz; Modulator Output Mode: TTL Level.
Chapter 2: CVSD Demodulator
Sampling Frequency: 32 kHz - 50 kHz; Sampling Frequency Mode: TTL Level;
Audio Signal: 500 kHz - 1 kHz.

Module Two: HDCT-17800-02
Chapter 3: QPSK Modulator
CLK: 600 Hz - 1 kHz; CLK Mode: TTL Level; Data Rate: 300 Hz – 500 Hz;
Data Mod: TTL Level; Carrier Frequency: 20 kHz.
Chapter 4: QPSK Demodulator
CLK: 600 Hz - 1 kHz; CLK Mode: TTL Level; Data Rate: 300 Hz – 500 Hz;
Data Mod: TTL Level; Carrier Frequency: 20 kHz.

Module Three: HDCT-17800-03
Chapter 5: QAM Modulator
CLK: 20 Hz ~ 200 Hz; CLK Mode: TTL Level; Data Rate: 10 Hz ~ 100 Hz;
Data Mode: TTL Level; Carrier Frequency: 20 kHz; Data Generated Mode: Pseudo Random Generator.
Chapter 6: QAM Demodulator
CLK: 20 Hz ~ 200 Hz; CLK Mode: TTL Level; Data Rate: 10 Hz ~ 100 Hz;
Data Mode: TTL Level;
Carrier Frequency: 20 kHz; Data Generated Mode: Pseudo Random Generator.

Module Four: HDCT-17800-04
Chapter 7: CDMA DSSS Encoder
Basic Spread Spectrum Encoder
Original Data Length: 4 bits; Data Input Mode: Dip Switch;
Data Length of Spread Spectrum Code: 2 bits;
Spread Spectrum Code Input Mode: Dip Switch; Data Length after encoded: 8 bits.
64 bits Spread Spectrum Encoder
Original Data Length: 8 bits; Data Input Mode: LED Display; Data Length of Spread
Spectrum Code: 8 bits; Spread Spectrum Code Input Mode: Dip Switch; Data Length
after encoded: 64 bits.
Chapter 8: CDMA DSSS Decoder
64 bits Spread Spectrum Decoder
Data Length before Decoded: 64 bits; Data Length Before Encoded: 8 bits; Original
Data Display Mode: LED Display; Data Length of Spread Spectrum Code: 8 bits;
Spread Spectrum Code Input Mode: Dip Switch.

Module Five: HDCT-17800-05
Chapter 9: BCH Encoder
4 bits BCH Encoder
Original Data Length: 4 bits; Data Length after Encoded: 7 bits; Error Detection: 1 bit.
8 bits BCH Encoder
Original Data Length: 8 bits; Data Length after Encoded: 12 bits; Error control: 1 bit;
Error Detection: 1 bit.
Chapter 10: BCH Codes Decoder
4 bits BCH Decoder
Data Length after Encoded: 7 bits; Original Data Length: 4 bits; Error Detection: 1 bit.
8 bits BCH Decoder
Data Length after Encoded: 12 bits; Original Data Length: 8 bits; Error Control: 1 bit;
Error Detection: 1 bit.

Module Six: HDCT-17800-06
Chapter 11: Convolutional Codes Encoder
(2, 1, 2) Convolution Codes Encoder
Code Rate: 1/2; CLK: 1 Hz ~ 10 Hz; Data Input Mode: Series Input; Data Length after
Encoded: 2 bits; Error Detection: 1 bit.
(2, 1, 3) Convolution Codes Encoder
Code Rate: 1/2; CLK：1 Hz ~ 10 Hz; Data Input Mode: Series Input; Data Length after
Encoded: 2 bits; Error Detection: 1 bit.
Chapter 12: Convolutional Codes Decoder
Viterbi Decoder
CLK: 1 Hz ~ 10 Hz; Data Input Mode: Series Input; Data Length After
Encoded: 2 bits; Error Detection:1 bit.

Module Seven: HDCT-17800-07
Chapter 13: GMSK Modulator
CLK: 600 Hz ~ 2 kHz; CLK Mode: TTL Level; Data Rate: 300 Hz ~ 1 kHz;
Data Mode: TTL Level; Carrier Frequency: 20 kHz; Modulation Index: 0.5.
Chapter 14: GMSK Demodulator
CLK: 600 Hz ~ 2 kHz; CLK Mode: TTL Level; Data Rate: 300 Hz ~ 1 kHz;
Data Mode: TTL Level; Carrier Frequency: 20 kHz; Modulation Index: 0.5.

Optional Function Generator/ Power Supply module: FG-17202
Power Supply: 4 fixed voltage outputs(+/- 5V, +/- 12V), 2 variable voltage outputs (+/- 0 ~15 V)
Low ripple and noise
Function Generator:
Output: 2 CHs
Frequency Range: 10 Hz ~ 100 KHz, 100Hz ~ 1 MHz
Waveforms: TTL pulse, Square, Triangle, and Sinewave
Amplitude: 10 Vp-p
2 built-in 6-digit frequency counters
Overload protection

* Oscilloscope, function generator, power supply, Spectrum analyzer are not included.

* Oscilloscope, function generator, power supply are not included.