QRSS: Everything You Need to Know

QRSS is a CW mode in which the receiver bandwidth is drastically reduced and the rate at which code is sent is slowed beyond that which would normally be readable by ear. It is named for QRS, … Read More

Resistance and Resistivity: Everything You Need to Know

Resistance and Resistivity Resistance (R) is the measure of how much an object – a resistor – opposes the flow of electric current. The resistance of an object is measured in Ohms (<math>\Omega</math>) Resistivity (<math>\Rho</math>) is a measure of … Read More


What is Gain?

What is Gain? Gain compared to a half wave dipole – dBD The gain of an antenna is the relative increase in radiation at the maximum point expressed as a value in decibels (dB) above a standard. … Read More


What Is Radio Wave Propagation?

Radio wave propagation largely depends on atmospheric conditions, the band and power used to operate the radio equipment. Ground waves are “line of sight” communication. Atmospheric conditions come into play when transmitting between ham radio stations that are farther away … Read More


Semiconductor: Everything You Need to Know

Structure of Atoms The simplest model of atomic structure has each atom is made up of a nucleus containing Protons and Neutrons, with electrons, circling the nucleus at various energy levels (layers). Each layer can only hold a … Read More


Impedance: Everything You Need to Know

Impedance is a property of electrical circuits that “impedes” current from flowing. Fundamentally, there are two types of impedance: Resistance and Reactance. The magnitude of impedance (represented by <math>Z\,</math>) of a circuit or component can be computed by … Read More

Call Sign Databases

Radio Call Sign Databases

There are various callsign databases out there. National callsign databases Andorra Antarctica Aruba Argentina Australia Austria Bahrain Belgium Belorussia Bermuda Brazil Bosnia & Herz Bulgaria Canada Canada Crete Cyprus Czech Republic Dominica Ecuador Egypt Estonia … Read More