Technical Library & Articles
Preserved archive of technical guides, antenna construction tutorials, and telecommunication treatises.
Exploring QSL Cards: How to Collect and Send Ham Radio Postcards Worldwide
A comprehensive guide to the century-old tradition of exchanging QSL cards. Learn how to design, verify, and mail cards internationally through postal bureaus and digital confirmations.
My Journey into Amateur Radio: How S21AMF Got Started On The Air
A candid personal memoir by Dr. Sheikh Md. Mahtabur Rahman (S21AMF). Discover how a medical doctor fell in love with radio frequency electronics and built an international training academy.
Understanding Digital Modes in Ham Radio: A Tech Guide to FT8, DMR, and D-STAR
Demystify modern digital communications with Dr. Mahtab (S21AMF). Learn how FT8 decodes signals below the noise floor and how DMR repeaters bridge global ham radio networks.
Deep Dive into Radio Wave Propagation: How Solar Flares Affect Your Signal
Master high-frequency propagation physics with Dr. Mahtab (S21AMF). Learn how ionospheric layers reflect radio waves and how to interpret live Solar Flux, Sunspot Numbers, and K-indices.
Welcome to Ham Radio: The Ultimate Beginner’s Guide to Getting Started
A complete beginner's roadmap to amateur radio by Dr. Sheikh Md. Mahtabur Rahman (S21AMF). Learn how radio waves travel, how to earn your license, and how to make your first contact.
Top 10 Mistakes New Ham Radio Operators Make (And How to Avoid Them)
Avoid costly equipment damage and awkward on-air errors. Dr. Mahtab (S21AMF) highlights the 10 most common mistakes made by new amateur radio operators and how to solve them.
Best Budget-Friendly First Radios for Newly Licensed Amateur Operators
A practical equipment breakdown by Dr. Mahtab (S21AMF). Discover reliable handheld, mobile, and entry-level HF transceivers that deliver maximum performance without breaking your budget.
The Ultimate Guide to Antenna Tuning and SWR Optimization for Ham Radio
Master the physics of antenna resonance and Standing Wave Ratio (SWR) with Dr. Mahtab (S21AMF). Learn how to use antenna analyzers, trim dipole legs, and solve stubborn mismatch problems.
The Ultimate Emergency Radio Guide: How Ham Radio Saves Lives in Disasters
When infrastructure fails, amateur radio operates. Dr. Mahtab (S21AMF) outlines essential tactical emergency communication protocols, off-grid power, and disaster go-bag preparation.
Making Your First Contact: Essential On-The-Air Etiquette for New Hams
Overcome mic fright with this practical operating guide by Dr. Mahtab (S21AMF). Master the ITU phonetic alphabet, repeater etiquette, and how to conduct a smooth, confident first QSO.
The Ultimate First Radio Guide: Choosing Between Handheld, Mobile, and Base Stations
2026-09-12 14:08:08', ' Passing amateur radio examination and receiving an official certificate from the Bangladesh Telecommunication Regulatory Commission (BTRC) is a monumental milestone. Earning th...
BTRC Amateur Radio Guidelines: How to Stay Fully Compliant in Bangladesh
2026-09-12 13:23:14', ' For radio enthusiasts in Bangladesh, turning on a transceiver and hearing your own call sign crackle through the static is an exhilarating milestone. Operating under an officia...
The Role of the International Amateur Radio Union (IARU) in Protecting Frequencies
2026-09-12 12:47:45', ' To the casual observer tuning a handheld radio on a local VHF repeater, the electromagnetic spectrum feels like an infinite, invisible highway. You press the push-to-talk butto...
Amateur Radio Glossary: Essential Terms and Jargon Every New Ham Must Know
2026-09-12 12:42:51', ' Stepping into the world of amateur radio feels remarkably like landing in a foreign country without a phrasebook. You tune into your first local repeater, eager to listen and l...
Essential Equipment Checklist for Building a Modern Ham Radio Shack
2026-09-12 11:58:15', ' Stepping into the room that will eventually become your personal amateur radio shack is an incredibly exciting milestone. Whether you are a freshly licensed operator holding a ...