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Technical Library & Articles

Preserved archive of technical guides, antenna construction tutorials, and telecommunication treatises.

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Antenna Lab 🌐 Published Oct 08, 2026

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.

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Antenna Lab 🌐 Published Sep 11, 2026

DIY Ham Radio Antenna Projects: Step-by-Step Building Guides for Beginners

2026-09-11 16:04:51', ' Antennas are the true heart and soul of any amateur radio station. You could own the most expensive, top-tier transceiver on the market, but with a poorly constructed or ineffi...

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Amateur Radio Glossary

ITU, RF & Technical Definitions

SWR / VSWR Voltage Standing Wave Ratio

A measure of impedance matching between the transmission line and the antenna. An SWR of 1.0:1 is a perfect match.

CW Continuous Wave

The transmission of International Morse Code by keying an unmodulated RF carrier wave.

QRP Low Power Radio Operation

Operating with 5 Watts RF output or less on CW, and 10 Watts PEP or less on SSB.

SSB Single Sideband

An efficient form of amplitude modulation where the carrier and one of the sidebands are filtered out.

DX Distance Transmission

Amateur radio communication over long distances, typically between different continents or rare countries.

Balun Balanced to Unbalanced

An impedance or isolation transformer connecting a balanced antenna (like a dipole) to unbalanced coax.

Yagi-Uda Directional Beam Antenna

A multi-element directional antenna using a driven element, a reflector, and one or more directors for high forward gain.

Dipole Half-Wave Wire Antenna

The fundamental resonant antenna measuring approximately 468/f(MHz) in feet, fed at the center.

Maidenhead QTH Grid Locator

A worldwide coordinate locator system encoding latitude and longitude into 4 or 6 alphanumeric characters.

UTC / Zulu Coordinated Universal Time

The international astronomical time standard used for all amateur radio logs to avoid time zone ambiguity.

Attenuation Signal Loss in Transmission

The reduction in signal strength that occurs as radio frequency power passes through coax or filters.

BTRC Bangladesh Telecom Regulatory Commission

The statutory regulatory authority responsible for administering Amateur Radio licensing exams and callsigns.

ITU International Telecommunication Union

United Nations specialized agency that coordinates the global shared use of the radio spectrum.

Dr. Mahtabur Rahman S21AMF · Cadet Glossary