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# Advanced Digital Communication Trainers TC-7000

### Description

**Features**

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.

**Objectives**

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.

**Module One: TC-7000-01**

**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: TC-7000-02**

**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: TC-7000-03**

**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: TC-7000-04**

**Chapter 7: 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: 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: TC-7000-05**

**Chapter 9: BCH Encoder**

**4 bits BCH Encoder**

Original Data Length: 4bits; Data Length after Encoded: 7 bits; Error Detection: 1 bit.

**8 bits BCH Encoder**

Original Data Length: 8bits; 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: TC-7000-06**

**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: TC-7000-07**

**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.