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

TVI

TVI: Everything You Need to Know

What is TVI? Simply, TVI is the interference of TV reception by transmissions from another source. In ham radio, we are specifically talking about transmissions from an amateur station, although it is not uncommon for … Read More

CTCSS

What Is Continuous Tone-Coded Squelch System

Continuous Tone-Coded Squelch System Initially, the purpose of this system – also known as tone squelch was to be able to “tune out” of conversations in a shared communications channel. Only stations sharing the same tone could communicate with … Read More

Slow-Scan Television (SSTV)

Slow-Scan Television (SSTV)

SSTV is a mode that uses a computer and an amateur radio transceiver to send and receive still images over radio. SSTV was originally an analogue mode based on Frequency Modulation (FM). Digital SSTV has become … Read More