Digital Amateur Radio Modes (FT8, DMR, JS8Call & Packet Radio)

💻 Course Mission: Modern Digital Amateur Radio Protocols & Networks

A comprehensive engineering guide on computer-radio soundcard interfacing, weak-signal decoding with WSJT-X (FT8/FT4), conversational JS8Call, off-grid APRS packet messaging, and global DMR digital voice networking.

Course Enrollment Fee: $5.00 USD (Special Affordable Pricing)
Curriculum Workload: 5 Comprehensive Academic Modules | 14 Practical English Lessons | 5 Modular Quizzes (50 Questions Each, 30 Minutes Exam Time)
Final Evaluation: 1 Final Comprehensive Mock Examination (100 Questions, 60 Minutes Exam Time)
Total Question Bank: Exactly 350 Verified Questions in this Course (6 Quizzes total)
Interactive Tools Included: S21AMF Radio Tools Hub (QSL Card Maker, Grid Locator, CW Trainer)
Student Support Desk: Integrated 24/7 Ticketing Helpdesk & AI Study Assistant for instant digital setup troubleshooting
Lead Instructor: Dr. Sheikh Md. Mahtabur Rahman (Callsign: S21AMF), Rangpur, Bangladesh

Core Competencies You Will Develop

✓ Computer-to-Transceiver Interfacing

Soundcard line-levels, 1:1 isolation transformers, eliminating ground loop hum, CAT control, and Hamlib.

✓ WSJT-X Weak-Signal Ecosystem

Physics of FT8, 8-GFSK modulation, sub-second NTP clock synchronization, split operation, and PSK Reporter mapping.

✓ JS8Call Keyboard Messaging & Relays

Conversational keyboard chats under noise, directed heartbeat commands, mesh store-and-forward, and APRS/SMS gateways.

✓ DMR Digital Voice & Codeplugs

2-slot TDMA framing, Color Codes, BrandMeister talkgroups, codeplug programming from scratch, and MMDVM hotspots.

Curriculum & Examination Syllabus

Module 1: Computer-to-Transceiver Interfacing & Audio Physics 3 Lessons + 50-Question Quiz

Lesson 1.1: Audio Signal Levels: Mic Level vs. Line Level & Isolation

Lesson 1.2: Computer-Aided Transceiver (CAT) Control: Baud Rates & Hamlib

Lesson 1.3: Audio Setting Best Practices: Eliminating ALC Compression

📝 Module 1 Assessment: 50 Questions (Exam Duration: 30 Minutes)

Module 2: FT8 & WSJT-X Weak-Signal Protocols 3 Lessons + 50-Question Quiz

Lesson 2.1: The Physics of FT8: 8-GFSK, 50 Hz Bandwidth & Split Operation

Lesson 2.2: Time Synchronization Requirements: Configuring NTP Services

Lesson 2.3: Deconstructing the FT8 QSO Sequence & PSKReporter Mapping

📝 Module 2 Assessment: 50 Questions (Exam Duration: 30 Minutes)

Module 3: JS8Call Conversational Networking & Emergency Messaging 3 Lessons + 50-Question Quiz

Lesson 3.1: JS8Call vs. FT8: Free-Text Conversational Ability at Weak Signals

Lesson 3.2: Directed Commands, Automated Heartbeats & Dynamic Mesh Relays

Lesson 3.3: Sending SMS and Emails from the Field via JS8Call Gateways

📝 Module 3 Assessment: 50 Questions (Exam Duration: 30 Minutes)

Module 4: Digital Mobile Radio (DMR) & Codeplug Architecture 3 Lessons + 50-Question Quiz

Lesson 4.1: 2-Slot TDMA Theory, DMR ID Allocation & Color Codes

Lesson 4.2: Talkgroups (Static vs. Dynamic), Rx Group Lists & Zones Explained

Lesson 4.3: Programming Your First DMR Codeplug & Setting Up MMDVM Hotspots

📝 Module 4 Assessment: 50 Questions (Exam Duration: 30 Minutes)

Module 5: Weak-Signal Protocols, GFSK Physics & DMR Networking 2 Lessons + 50-Question Capstone Quiz

Lesson 6.1: Mathematical Physics of FT8 & JS8Call: 8-GFSK Modulation & LDPC

Lesson 6.2: DMR Architecture: TDMA 2-Slot Framing, Color Codes & Talkgroups

📝 Module 5 Capstone Assessment: 50 Questions (Exam Duration: 30 Minutes)

Final Module: Course Certification Examination Final Mock Exam

Comprehensive Evaluation: 100 Randomly Selected Questions covering all digital protocol modules.

🎓 Final Examination: 100 Questions (Duration: 60 Minutes, 80% passing grade to receive certificate)