The high level digital communication trainer should consist of the following modules:

CVSD Modulator & Demodulator
--Sampling frequency: 32kHz-50kHz; Sampling frequency mode: TTL level; Audio signal: 500Hz-1kHz
--Modulator output level: TTL level

QAM Modulator and Demodulator
--CLK: 20Hz - 200Hz; CLK Mode: TTL Level; Data Rate: 10Hz-100Hz; Data Mode: TTL Level
--Carrier frequency: 20kHz, Data Generated Mode: Pseudo Random Generator

DSSS Encoder and Decoder
--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
--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

BCH Encoder and Decoder
--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
--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

Convolutional Encoder and Decoder
--(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
--Viterbi Decoder
--CLK: 1 Hz ~ 10 Hz; Data Input Mode: Series Input; Data Length after Encoded: 2 bits; Error Detection: 1 bit

GMSK Modulator and 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.

Function Generator and DC Power Supply
--Waveforms: Sine, Triangle, Square, TTL Pulse
--Amplitude: >10Vpp
--Impedance: 50Ω, ± 10%
--Duty Control: 30% ~ 60%
--Display: 6-Digit LED
--Frequency Range: 10Hz ~ 100 kHz (4 Ranges)
--Frequency Range: 100Hz ~ 1 MHz (4 Ranges)
--Constant Voltage Output: ± 5V, ± 12V
--Variable Voltage Output: 0V ~ ± 15V
--Power source: 220~230V AC, 50Hz, 1 Phase
--Standard accessories with printed operation manual