Oscillator Design

Oscillator Design: Everything You Need to Know

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

QTH

here are multiple systems in use for identifying location (QTH) using zones or grid squares. Zone systems A number of systems exist to divide the world into zones and regions. In some cases, the divisions and … Read More

Filters

What Is A Filter?

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

What Is A Vertical Antenna?

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

Mobile antenna

What Is A Mobile Antenna?

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

Antenna Tuner: Everything You Need to Know

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

Resistors: 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

Decibels

Decibels: Everything You Need to Know

What is a decibel dB? Some facts a decibel is the ratio of two power measurements decibels have no units decibels is a logarithmic relationship a decibel is 1/10 of a Bel decibels were created … Read More