Impedance

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

DXpedition

What Is A DXpedition?

What is it? A DXpedition is an expedition by amateur operators to what is considered an exotic place. These places are “defined” as exotic because of their remoteness or because there are very few radio … Read More

QRM

Radio Noise Experiments

Are Compact Fluorescent Lamps (CFL’S) RF Quiet? There has been a lot of exchanging of views about these lamps in the press of late and it revolves around the light output and the initial purchase … Read More

E-Skip

E-Skip: Everything You Need to Know

What is it? The E-layer is the lowest layer of the atmosphere and can typically be found at altitudes between about 80km and 100km. the E-Layer is characterized by high electron densities, and high temperatures … Read More

What is a harmonic?

What is a harmonic? A harmonic of a particular frequency (the fundamental frequency f) is a frequency that is an integer multiple of the first one. For example: if f = 125 MHz, the harmonics would … Read More

70 centimetres

The 70-Centimeter Band: Everything You Need to Know

The 70-centimeter band is a popular UHF band. Equipment Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both 2 meters and 70cm. Available gear includes base stations, mobile units and HTs. … Read More