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Fundamentals An oscillator is an electronic circuit designed to produce either audio or radio frequency signals. These will generally have sinusoidal waveform, but other wave shapes such as square and sawtooth are possible. In radio … Read More

A filter is an electric circuit (often called a network) that allows certain frequencies to pass but rejects (attenuates) other unwanted frequencies.In general, filters are one of four types – Lowpass, Highpass and Bandpass (Notch) … Read More

Vertical antennas, often simply known to amateurs as “verticals,” are antennas in which the driven element is vertical. Most common verticals are simply a piece of wire or aluminum tubing mounted vertically, but others, such as those designed for mobile … Read More

The DXCC is an award available to hams throughout the world, granted by the ARRL, to those who can verify two-way contacts to 100 different entities from the DXCC country list. Verification can be either by QSL cards or through … Read More

Mobile antennas are designed to be used for operation while in motion. Their uses include pedestrian mobile operation while walking, bicycle-mounted antennas for use while riding, and the most common form, automobile-mounted antennas for use … Read More

An antenna tuner, also known as a trans match, is a device for correcting an impedance mismatch between a transmitter or receiver and an antenna. The Tuner Fallacy It is often believed that a tuner actually “tunes” … Read More