Digital Communication Trainer DL 3155M61
Learning Capabilities:
The trainer allows students to study and compare multiple modulation and demodulation techniques, including:
- Pulse Code Modulation (PCM)
- Pulse Amplitude Modulation (PAM)
- Pulse Width Modulation (PWM)
- Pulse Position Modulation (PPM)
- Pulse Frequency Modulation (PFM)
- Delta Modulation (DM)
It also demonstrates the impact of channel noise, signal distortion, and filtering, helping learners evaluate the strengths and limitations of each technique in practical scenarios.
Core Features & Functional Blocks
1. Modulation & Demodulation Systems:
- PCM modulator/demodulator with 8-bit compression coding (µ-law / A-law selectable)
- PAM, PWM, PPM, and PFM modulation and demodulation circuits
- Delta modulation system with real-time signal processing
- Conversion between PWM and PPM signals
2. Multi-Channel Communication:
- 2 transmission channels and 2 reception channels
- Time Division Multiplexing (TDM) capability
- Synchronization signal regeneration for accurate data transmission
3. Signal Processing & Filtering:
- Anti-aliasing and band-limiting analog filters
- Bandwidth ranges:
- 300 Hz to 3400 Hz (voice band)
- Up to 4000 Hz for wider signal analysis
- Sampled (non-quantized) signal observation
4. Noise & Channel Simulation:
- Adjustable noise injection for both analog and digital signals
- Study of signal degradation and recovery techniques
5. Supporting Circuits:
- PLL-based PFM implementation
- Ramp signal generation and timing circuits
- Microphone amplifier with automatic gain control (AGC)
- Output amplifiers capable of driving small speakers
System Modules Included:
- DL 3155E61 – Digital Modulation/Demodulation Board
- DL 3155AL2 – Base Frame with Power Supply
or - DL 2555ALG – Power Supply Module
- TL 3155AL2 – Connecting Cables
Software Integration:
The trainer can be supplied with Student Navigator Software, allowing learners to:
- Perform guided experiments via a PC
- Access interactive learning materials
- Operate without additional manuals or documentation
Digital Communication Trainer – DL 3155M61
The DL 3155M61 Digital Communication Trainer is an advanced educational platform designed to help students understand and experiment with the core principles of digital communication systems. It enables hands-on learning through the design, analysis, and testing of electronic circuits used in real-world communication applications.
This trainer provides a comprehensive environment where learners can explore how analog signals are converted into digital formats and transmitted using widely used modulation techniques. By working directly with the system, students gain practical insight into signal processing, transmission, and noise behavior—key areas in electronics and computer engineering.
Educational Benefits:
- Bridges theory and practical implementation
- Enhances understanding of modern communication systems
- Ideal for engineering labs, technical institutes, and vocational training centers
- Supports experimentation, troubleshooting, and comparative analysis
