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If you needed the ability to quickly measure RF voltage for tuning filters and cavities this RF Probe probe is for you

N1HFX thermal coolin fan controller project

Pro and cons of Digital ATV versus Analogue ATV

A CW beacon keyer for 222 MHz by VA3NFA

The Multibandfuchs by DL7AQT, Frank

A trapped multi band end-fed-half-wave antenna for 40/30/20/17/15m.

Switching Regulator Basics By Mike Martell N1HFX

Pictures of the restructuring of the ham shack starting from an existing garage. Changes includes isolation of walls and roof and rebuilding of the radio table.

Circuit designs for IC audio amplifiers by N1HFX

A summary of common calling frequency for each digital mode on that band.

A fully documented restoration project of a Hallicrafters SX99 receiver

The purpose of this article is to provide radio amateurs with enough background information to understand the technical challenges involved in small-station digital EME on the 144 and 432 MHz bands.

Bearing Info uses an extract from the VKLogger.com web site Op-Info to make it easy to find a callsign and hence bearing and distance information. It is written specifically for VK operators for use in Field Days although it could be considered a general purpose amateur radio utility, mainly for Aussies by VK4ADC

Tutorial about writing a software SSTV modulator/demodulator using slant correction and several improvements. It requires programming language knowledge and programming skills.

The Shoddytenna is a 160 meters band vertical antenna intended for portable use. This antenna takes just 15 minutes to erect on site, can be carried by hand and is ideal for local groundwave work.

A DIY aluminium push up mast project. The final mast includes 7 aluminium tubes with 6 cable clamps

Use your Smartphone as an Oscilloscope to visialize signals from 150 Hz to 15kHz and as a Signal Generator to generate sinusoidal, square and triangular signals up to 15kHz

WiFi dealer based on poland with online shop, dealer for MicroTik Ubiquity Alix and more

DTMF Keypad for radios without one. A project with picture and schematic diagrams to homemade a DTMF keppad

How to make a Morse Code Oscillator

A multi band antenna for HF band capable to operate from 10 to 80 meters band depending on wire lenght loaded with a small inductance neat the feed end.

Yaesu FT-950 and FT-2000 Roofing Filter Optimization and Improvement

A basic multimeter project with full schematic diagram by G3PTO

Hardware and software projets by IW3GRX

Tips and tricks for succesful soldering. An illustrated guide for beguinners and an usefull reminder for expert in soldering.

This project takes after the VGA-to-Scope converter by using composite video rather than VGA signals to create a display on an oscilloscope.

PropNET is an ad-hoc 2-way (and potentially, "more-way") RF-based digital communication network whose activity is reported on the Internet. As participating stations periodically ID and exchange data, they report their activity to an Internet data-collection hub for presentation through this web site.

An universal antenna tuner interface, the Kenwood Remote LDG Tuner Interface by af6sa

A 3.2m EME dish project that provides a better performance on 1296 MHz (10+dB sun noise vs. 6dB with my 432 array) and an even better performance on 2304 MHz

Build a digital AC voltmeter to measure the output range from 0 to 150VAC with reasonable accuracy

It is possible to add a very small Bluetooth transmitter to the 3.5mm headphone jack and then use a pair of Bluetooth headphones around the shack. In this article Author provides some tips on choosing the proper Bluetooth interface.

A 3CX1500/A7 8877 144mhz W6PO amplifier, that running a little over 4kv on the plate, this Amp will do over 2kw out.

Homemade an external T/R switch for your vintage RTX by KB8OJH

Schematic diagram of a two tone audio oscillator by VK3YE

HM-36 Modification to make it work with an IC-7200 and the IC-7600

Returning a TH-D7E to its original European configuration.

Building the Three-Element Hex Beam. A project and construction phase of an HF hex-Beam antenna using trees to hang the antenna and a Channel Master antenna rotator.

This DIY vertical multi-band Windom antenna offers a practical and effective solution for amateur radio enthusiasts seeking a versatile and compact antenna for HF communications. Its simplicity of construction, multi-band capability, and favorable performance make it a valuable addition to any radio shack. The article provides detailed instructions on constructing the antenna and balun, along with diagrams and component specifications. Field tests demonstrated successful contacts with stations across Europe and North America on 14, 18, and 28 MHz. The antenna exhibited comparable performance to a W3DZZ dipole and outperformed a Cobweb antenna on 18 MHz. Low noise levels were observed, effectively suppressing background noise.

This antenna is an off-center fed spiral dipole for 40 meters. The spiral dipole is very compact, making it well-suited for limited space (like an apartment patio), while the off-center feed gives the antenna some multiband capability.

While transistors have many uses, one of the less known uses by amateurs is the ability for bipolar transistors to turn things on and off

Home of the D-Star Hotspot Kits and Hotspot Firmware

An experimento of a 40 meter delta loop antenna both in horizontal and vertical polarization and several elevation angles with interesting notes about the effect of the radial field under the antenna.

A homebrew project about a bluetooth interface to connect a transceiver to an audio headset.

Converting a computer\'s VGA output for an oscilloscope

A page with pictures of the Ameritron AL-80B Amplifier, including the inside box where is possible to see the 3-500ZG tube capable to provide 800W in CW.

A discharge circuit which you could use to cycle the batteries

Fox Controller, designed by VE2JX and VE2EMM includes schematic diagram to build the transmitter.

A new ham radio shack desk made of a solid core oak door.

Mirage BD-35 2M/70CM RF amp high SWR, how to troubleshoot

This is a project aboout compact and portable a QRP antenna tuner for use in the HF ham radio bands from 3-30 MHz, even if it's a compact and efficient project this small antenna tuner will not match any possible load.