Search results

6x2 coaxial remote antenna switch, completed unit showing weatherproof relay box and station control unit.

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

UM58 a regenerative receiver project

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.

1.2-30V 1.5A variable regulated power supply

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.

Portuguese page, from VLF to some GHz, antennas, projects, EME, NDB DX and more.

A NorCal Project A Crappie, not crappy, portable antenna

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

A quick vertical for 160 meters portable use

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 construction of two distinct wideband RF preamplifiers, detailing their component requirements and performance characteristics. The first design leverages monolithic microwave integrated circuits (MMICs) such as the MAR-6, MAR-8, or PGA103, offering a broad frequency response from DC to 2 GHz with a gain of 22.5 dB at 100 MHz and a noise figure typically below 3 dB. This MMIC-based amplifier incorporates protection against power supply transients and features a 50 Ohm input/output impedance, operating from an 8-20 volt supply with low current drain. The second preamplifier design utilizes a BSX-20 transistor, providing amplification across the 14 MHz to 550 MHz range. This simpler, more economical build achieves an average gain of 12 dB at 145 MHz and a noise figure of approximately 1.1 dB. It operates from a 7-15 volt battery supply with a current draw of 6 mA. Both projects emphasize critical construction techniques, such as maintaining short RF connections, ensuring 50 Ohm impedance paths, and mounting the circuit within a shielded enclosure to optimize performance and minimize noise. The resource also discusses phantom power options for antenna-mounted preamplifiers and precautions for use with transceivers, including output protection diodes and static bleeders.

Circuit diagrams to homebrew different baluns by vk2awx

Homebrewed SWR meters projects by G3TXQ

Lots of projects and introductions to RDF and T Hunting

80 metre ceramic resonator VXO CW Transmitter by VK1PK

Sales tubes for amplifiers like GS-23B,GS-31B,GS-35B,GU-34B,GU-43B,GU-74B,GU-84B. Include links to aplifier homebrew projects

Build an HF antenna tuner by VK5AJL

FAR Circuits is exclusively a manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusiast.

Remotely controlled antenna switch that can switch between 5 antennas

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

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

Projects and design atv de ik1hgi Progetti, circuits, master, fotos in Italian

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

The PDF document, titled "J-Poles," presents various J-pole antenna designs covering the 50 MHz to 450 MHz frequency range. It includes construction details for several specific bands, such as a 6-meter J-pole, a 2-meter J-pole, and a 70-centimeter J-pole. The content outlines the fundamental principles of J-pole operation, including the quarter-wave radiator and half-wave matching stub. Each design features specific dimensions for elements like the radiator length, stub length, and spacing, often expressed in inches. The document also discusses feeding arrangements and impedance matching considerations inherent to J-pole antennas. It provides practical guidance for homebrewing these antennas using common materials like copper pipe or wire elements. The resource offers insights into the advantages of J-poles, such as their omnidirectional pattern and ease of construction, making it a practical reference for radio amateurs interested in VHF/UHF antenna projects.

Contains digimodes, antenna projects, DX info and lots more

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

Enabling IC 706 for 4 meter band modification in italian.

Fox Delta Amateur Radio Projects & Kits

If you want to build a repeater, this is the right place to start. Includes construction projects and reviews of repeater hardware available in the market.

PSK31 Software for the EZKIT and Windows 95/98 PC

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

CTCSS Decoder and Encoder, DTMF Decoder projects

Demonstrates the construction and measurement of a single-turn HF receiving loop antenna, built from common materials like electrical conduit and lamp cord. The resource details the physical dimensions, including a 4-meter circumference, and calculates the theoretical inductance at approximately _6.4 uH_. It outlines a method for determining resonant frequencies across the 4-17 MHz range using a _C Jig_ and a _VR-500 receiver_, coupling the loop with a ferrite ring. The article also discusses the impact of receiver coupling on the loop's Q factor, noting a degradation in sharpness due to the transformer's reflected impedance. Analyzes the observed resonant frequency patterns, highlighting an unexpected rise in the loop's effective inductance at higher frequencies, particularly above 13 MHz. While some increase is attributed to distributed capacitance, the rate of rise suggests further investigation. The experimental setup provides practical insights into the challenges of maintaining high Q in simple receiving loops and offers a comparative reference for other homebrew antenna projects, such as those by _VK2TPM_.

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

WV7U's YC156 and 3CPX800 amplifier projects. Everything you wanted to know about using the YC156 or 3CPX800 in a ham radio linear amplifier. See pictures, schematics, test data, links, and more!

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

FAR Circuits is exclusively a manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusias

The resource details the historical development of the Morgain antenna, tracing its origins to Virginia in the 1960s and its subsequent global adoption among radio amateurs. It describes the Morgain as a dual-band wire antenna known for its reduced footprint and modest gain characteristics. The content includes discussions on various homebrew projects and design variations available online, providing context for its continued relevance in amateur radio. The article presents a historical overview rather than specific construction plans, focusing on the antenna's evolution and general design principles. It highlights the antenna's enduring appeal due to its performance attributes and compact size, making it suitable for various operating environments.

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

Long Range Wi Fi Antenna by AB9IL

Some rules of thumb for beginners, with a QRP approach, by James R. Duffey KK6MC/5

A combination of Fldigi and Flmsg for portable devices running Android used for NBEMS