DTMF Dual Tone Multi-Frequency DTMF is used in ham radio in applications such as IRLP and Echolink, as a means to dial outside numbers via phone patch and as a means for repeater owners to configure the system remotely. It is … Read More
In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. Squelch is widely used in two-way radios to suppress … Read More
An antenna loading coil is an inductor placed in series with an antenna element in order to lower the antenna’s resonant frequency. A standard dipole antenna is resonant if constructed with a length of one-half wavelength. A vertical antenna (effectively half … Read More
WSPR Weak Signal Propagation Reporter WSPR (usually pronounced “whisper”) is a software application that uses the transmission mode MEPT-JT (Manned Experimental Propagation Transmitter – Joe Taylor). In MEPT transmissions, the radio becomes a beacon that transmits for just under … Read More
Dipoles are one of the first antennas ever created. Indeed, Hertz himself is often credited as the inventor of the dipole, 1886). It’s also the simplest antenna designs out there while staying very powerful and … Read More
A software-defined radio (SDR) is one in which functions such as tuning, filtering and modulating/demodulating are performed by software rather than hardware. The ease with which this is now possible is due largely to advances in digital … Read More
The RTL2832 is an IC produced by Realtek Corporation to demodulate DVB-T (digital TV) signals and send them to a host computer over the USB bus. It has an additional mode designed to allow reception of consumer … Read More
What is it? A DX Cluster is, in essence, a “chatroom” or node into which amateur DX hunters can post information about DX either worked or heard. Physically, it is a central computer that collects, … Read More
Most people agree that the manual that comes with this radio is horrible. Let’s try to create a better one. Modes Hold U/V to switch between manual tuning and preset mode. In channel preset mode … Read More
The VHF Quagi from an article by Wayne Overbeck, K6YNB in QST April 1977; “Building a 440MHz Quagi” description is from Gary Bonnor – VK4ZGB There have been many half-hearted attempts to combine a Yagi … Read More