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The NCDXF/IARU International Beacon Project operates a worldwide network of 18 high-frequency radio beacons, continuously transmitting on 14.100, 18.110, 21.150, 24.930, and 28.200 MHz. These beacons, initially launched in 1979 with a single station and expanded to the current 18-beacon system in 1995, provide reliable signals for both amateur and commercial users to assess current **ionospheric propagation** conditions. The system's design, construction, and operation are managed by volunteers, covering hardware and shipping costs. The resource details the evolution of the beacon network, including the transition from Kenwood TS-50s transmitters to Icom IC-7200 radios with a new controller design implemented in 2015. It explains how listening for these 100-watt signals, transmitted to vertical antennas, allows operators to determine band openings and optimal propagation paths globally. The content also references three QST articles providing historical context and technical specifics of the beacon project. Practical information includes methods for identifying transmitting beacons via a schedule or specialized software like FAROS and Skimmer, which integrates with the **Reverse Beacon Network** for automated monitoring.

Amateur Radio Projects & Kits for homebrewers, includes DDS,sound card interface,programmers, hamcom, frequency counter, RF Power Meter, modems and more.

Schematic anc PCB for a fox hunting receiver for 80 meters band

How to build a lightweight amplifier that can be backpacked around.

VK3YE magnetic loop antenna plan that cover 7 Mhz to 20 Mhz and shortening loop can work on 21 Mhz.

Tips to homebrew your own HF traps using aluminium wire and doorknob capacitor

High Gain Wi-fi Helical Antenna by AB9IL

This simple and cost effective interface circuit is designed for use with any ICOM amateur radio equipment with CIV interface

Home brewed spider beam by VA7ST

The page provides a project for an helical dipole for the 40 meters band, resonating on 7 MHz, created by PY1ZFK based on a design by DL8VO. It includes detailed instructions on building the antenna.

Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.

A small random wire antenna tune that can tune from 40 to 10 meters bands.

A magnetic loop antenna working from 30 to 15 meters with 100W

The future of two way radio is digital.

Interesting article on how build your own field day antenna

As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Thif filter help you on improving reception

Open-Source Software Implementation of a DRM (Digital Radio Mondiale) Receiver. Dream runs on virtually any pc and requires a receiver front-end to work as a real radio.

Article about small magnetic loop antennas with notes on realization of magnetic loops for several HF bands and the six meter band

Magnetic loop for 20 to 6 metres pedestrian mobile by VK3YE

The N3UJJ multi band cage dipole antenna project thay can fit a small property

This article loaded with nice pictures and schematics, describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. It was designed and constructed by William Moneysmith, W4NFR. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive.

A moxon antenna project made with wires and fiberglass poles

This project hereby presented is a complete HAM radio simplex 'smart' repeater, built around a Motorola GM-350/950, Arduino NANO board and a WINBOND audio recording integrated circuit

A DIY guide to build your own compact multiband HF antenna based on the G3TXQ version using a 1:4 balun. This article includes the full part list and instructions to assembly, including the center plate.

Design and build an 6 m dipole antenna from aluminum, tubing, that resembles the active element of a yagi beam antenna.

A cooperative venture between MSUARC and Calloway County Fire and Rescue

A simple fixed frequency SSB voice transceiver for the 7 MHz amateur band

An open collaborated project for creating base libraries and applications to allow the passing of information from the host computer to the D-STAR radio and vice versa.

Modifying consumer off the shelf wireless LAN devices for specialized amateur use

10 meter propigation beacon project

Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity

An homebrew Lindenblad antenna designed specifically for LEOs reception.

A magnetic loops for HF pedestrian mobile project by VK3YE

A compact 2 element W8JK beam antenna for 20M to 10M bands by AF6SA

A K9AY loop antenna project done with Far Circuits pc boards for the antenna switch and bandpass filter and preamp by K7SFN

Mounting on Roof or at Ground Level? Why ground plane antenna works better at lower level.

EggsHam is a PalmOS application that generates (and grades) _practice_ amateur radio licensing exams. It is for people interested in obtaining an amateur radio license in the US, who want to practice for the Technician, General, or Extra written exam.

A simple to build full length 20/40 dipole antenna to be used in inverted vee configuration

AF6SA USB antenna AZ-EL rotor controller compatible with Yaesu G-5500, G-450, G-650, HY-Gain and other AC motor rotors

An indeal stealth antenna made by multiple quarter wave verticals, supported by a tree.

The purpose of this project is to build a smart switch A smart swith is a swith that needs a short press and the power will be turned ON.

An Homebrew 10 Meter transceiver

An high gain long yagi antenna, seven elements, for six meters band

hamelmer.com

A simple coax cable tester built based on the KG0ZZ project.

On these pages you will find articles and pictures reagarding a renewed Drake TR7 by DK4DDS

Taking the venerable SMK-1 design to 20m and adding an RF amp, audio filter, and a TiCK Keyer ... by Wayne McFee, NB6M

Receiving rhombic antenna experiments by Jelmer PA5R

End-Fed Half Wave matching unit project, based on a FT140-43 with SWR plot tests made using capacitor and without.

Aduino-based Amateur Radio Antenna Rotator Controller that can emulate the Yaesu GS-232A or GS-232B interface by K3NG