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A homebrew fishing-rod vertical using a very nice design from EB5EKT. This antenna works 20, 30, and 40M bands by selecting the tap points using alligator clips

The Contesters Choice

The W6AMT Beacons is a Windows program which automates the collection of radio propagation data. HF data is collected by monitoring the worldwide network of NCDXF / IARU HF beacons.

This antenna allow transmission and reception on all bands between 7Mhz and 28 Mhz. Similar in concept to the Miracle Whip by VK3YE

A schematic design of the W3DZZ antenna in portugues with description of trap building

The project outlines the process for constructing a low-power FM broadcast transmitter using a Raspberry Pi Zero, a simple wire antenna, and battery power. It details the software installation steps for PiFM and MPG123, essential for generating and transmitting audio. The resource provides instructions for configuring the Raspberry Pi to broadcast FM signals, including command-line operations for initiating transmission and playing audio files. It specifically focuses on the Raspberry Pi Zero's capabilities for this application, highlighting its cost-effectiveness and minimal hardware requirements. The content presents a practical, hands-on approach to creating a basic FM transmitter, suitable for short-range, experimental broadcasting. It includes guidance on testing the FM output and ensuring proper operation of the software components. The project emphasizes the use of readily available components and open-source software to achieve functional RF output.

Build this simple and cheap 70 MHz Exciter and start to transmit Digital Television by Jean-Francois Fourcadier

UM58 a regenerative receiver project

An amateur observatory using a 4 GHz TVRO antenna.

1.2-30V 1.5A variable regulated power supply

A project to build a cross band repeater using a pair of Baofeng UV5R handheld transceivers.

Open source libraries and utilities to support using digital signatures for Amateur radio QSL system information like eqsl and lotw. Available for windows macos e linux.

A NorCal Project A Crappie, not crappy, portable antenna

A quick vertical for 160 meters portable use

Signalprocessing for SSB - Direct Conversion Receiver using Phasemethod for Sideband Supression, does all necessary signalprocessing for Direct conversion Receivers using IQ-mixer for demodulation.

The St. Louis Vertical Revisited by Dave Gauding, NF0R here are a few ideas and observations on the St. Louis Vertical

Local and DX contacts from tight spaces, it works from 40 to 17 meters

Demonstrates the essential steps for winding **toroidal cores**, a fundamental skill for amateur radio operators engaged in homebrewing and kit building. It addresses the critical aspects of selecting the correct core material and wire gauge, emphasizing the importance of precise turn counting and consistent winding tension to ensure optimal circuit performance. The resource details methods for preparing the wire, including techniques for safely removing enamel insulation from leads using flame, sandpaper, or a solder pot, and provides guidance on tinning the exposed wire. Explains the process of mounting the wound toroid onto a printed circuit board, highlighting the need for careful lead placement and secure soldering to prevent shorts and ensure mechanical stability. It also offers a practical formula for calculating the required wire length based on the desired number of turns and the specific **toroid** size, referencing common core types like T-50 and FT-240. The guide stresses the importance of verifying the inductance of the wound component, often using an inductance meter, to confirm it matches design specifications. Provides practical tips for handling multi-filar windings and managing short lead lengths, which can be particularly challenging. It underscores the necessity of meticulous attention to detail throughout the winding and installation process to achieve reliable and efficient RF circuits.

Circuit diagrams to homebrew different baluns by vk2awx

Online map creation using AZ_PROJ

A two element multiband quad antenna

80 metre ceramic resonator VXO CW Transmitter by VK1PK

Build an HF antenna tuner by VK5AJL

Yet another G5RV antenna plan to build a G5RV Antenna for 80 to 10 meters usage

Recordings of shortwave numbers stations

Excellent poster representing the electromagnetic spectrum from 31.2 mHz to 6.52 EHz, PDF file poster designed by Anthony Tekatch

Remotely controlled antenna switch that can switch between 5 antennas

A pdf file with schematics of an ssb and cw filter AF amplifier

Build An Offset Attenuator by Joe Moell K0OV as featured in Homing In for May 1998

Spek helps to analyse your audio files by showing their spectrogram. Spek supports all popular lossy and lossless audio file formats. Spek is free software available for Unix, Windows and Mac OS X.

This vertical antenna consist of a 18 meters telescopic pole and allow operations from 160 to 30 meters band, project by Daniel Zimmerman N3OX

Contains digimodes, antenna projects, DX info and lots more

KG4JJH moxon assembly plan for the 50 Mhz in a pdf file

This strange looking antenna is a combination of Coupled-Resonator principle by K9AY and a quarter stubs to achieve low angle radiation pattern. Designed with 4nec2 NEC based antenna modeler and optimizer for 145/220/440MHz bands

A 144/440 dual band open stub J-Pole Antenna project by NT1K

Enabling IC 706 for 4 meter band modification in italian.

W6/PA0ZN CATV tuner based Spectrum Analyzer Building Project

The page is about the 144 Mhz Dirty Beacon project, a VHF beacon keyer by 9A4QV. It provides technical information, project details, and resources for amateur radio operators interested in beacon keyers. The content is useful for those looking to build or learn about VHF beacon keyers.

PA is a JAVA software package containing several programs, SW/VHF/UHF Logbook (imports format from RADIOMAN, VMT), Log conversion to HTML format, Import and export functions for RADIOMAN, CT RES files, BV QSL Labels, CSV etc. Internet DX-Cluster support, Keeps track of your worked Callsigns, Checks your worked Grid Squares per band, Databases for worked Grids and Callsigns Uses K1EA CQWW.CTY country file, Easy command line version for terminal operation Moontracking as clock, Pathloss calculation

PSK31 Software for the EZKIT and Windows 95/98 PC

K9AY 160M / 80M Receiving Loop Antenna System by K7SFN

50 MHZ Moxon antenna based on the KG4JJH design with some slight modifications in the construction

A simple accurate power splitter for the 70cm uplink to Oscar 13

A simple TRAP-dipole project for 20 and 40m bands includes EZNec simulations

A ground plane antenna for 80 meters band

An interesting home made project of an L Network Antenna Tuner Project with pictures and schematics by K7SFN

An Arduino APRS project based on the real time OS BeRTOS

14MHz SSB 10mW transceiver by JF1OZL

A lower power desktop linear with integrated 120vac power supply. This, very compact, dual 811 version will deliver about 300 watts output. Covers all bands including WARC bands.

xdx is a dedicated Linux network client for amateur radio operators who want to exchange DX (long distance) radio information