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DIY Basic Electronic Theory, Basic Antenna Theory with Antennas built from common materials. What does SWR really mean. Baluns from transmission line.

The Yaesu VL-1000 Quadra HF Linear amplifier

A program to design and print QSL cards on your computer, as well as design QSL cards for printing by commercial printers. This program overcomes many of the limitations that are present in other QSL design and print programs and methods. Works on Windows 7 to 10.

This sketch will read RF power and SWR from any SWR bridge, designed to work on VHF UHF bands

2 m. Band VHF Collinear with 2 Dipoles by sv1bsx

A program to control a repeater using an old computer and printer or serial port.

2 element Quand antenna for 10 - 12 - 15 -17 - 20 meters band

AALog v3.9.0 Build 1288 is a Windows-compatible logging program for amateur radio operators, supporting Windows 2000 through Windows 10. It integrates with CwType, CwGet, TrueTTY, and AAVoice for CW, RTTY, PSK31, and voice operations. The software facilitates online and offline QSO entry, duplicate checking, antenna direction, and distance calculations to DX stations. Key features include managing multiple logs under a single callsign or for different callsigns, and extensive award tracking for DXCC, WAZ, P-75-P, WAS, WAJA, JCC, JCG, WAIP, Russia, RDA, DPF, DDFM, WAU, and WPX, with user-definable award additions. It includes a built-in QSL-manager database, locator grid support, and detailed prefix lists. The program supports export to ADIF and text files, and import from ADIF, LoTW reports, Cabrillo, and AATest formats. External database integration is supported for Buckmaster HamCall CD-ROM, QRZ CD-ROM, RAC CD-ROM (Flying Horse), and Russian Internet Callbook. QSL manager databases like GoList, QSL Routes, and WinQSL are also compatible. The software package for v3.9.0 Build 1288 is 10,630,589 bytes.

How to build an Hexagonal antenna in 3 hours

An informative page about delta loop antennas

Modified version of the Telerana antenna which was orginially featured in the July 1979 issue of QST. The array is suspended within a framework made of fiberglass poles emanating from a central hub with the ends tied together with light weight rope around the perimeter. 10-15-20-30-40 meter band coverage

Article by Ed WE6W on a double bazooka antenna

40 meters band Delta loop antenna plan that is vertically polarised

Premium quality QSL cards, with samples, preview and on-line order

Starting from an original project for a 2 element quad antenna for six meter band, ve7ca presents the dimensions for a 3 element version.

Journal is a **freeware logbook software** designed for Windows operating systems, providing amateur radio operators with a robust tool for managing their contacts. It supports both real-time logging during a QSO and post-event data entry, allowing flexibility for different operating styles. The software facilitates the creation of QSL cards and address labels directly from logged data, streamlining the QSLing process. Additionally, it can generate log sheets specifically formatted for the RSGB VHF-UHF-SHF Competition, which is beneficial for contesters. Derek, G7LFC, developed Journal to be Year 2000 compliant, ensuring its longevity and reliability for logging contacts across different eras. The program supports various operating modes, making it versatile for general DXing, contesting, and everyday ragchewing. Its ability to produce competition-specific logs and QSL materials makes it a practical utility for active operators.

A very quick and easy way to get on the air is to build a "Michigan Mighty Mite" CW transmitter for 160, 80, 40 or 30 meters. It can't get simpler than this. It has very few parts, costs almost nothing, and it works! Cost estimate $10 by VE6WTF

Here you will find information about wire antennas as well as directional beams.

Based on Motorola MRF454, schematics and component list

Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL

DJ9BV yagi antenna for 2 meters band

Lots of information of hidding transmitters, building portable yagi antennas, s-meters, and much more

Home of the ultimate Ham Radio QSL Label Program! Quick QSL for DOS, featuring great color, dot matrix, laser, and inkjet printer support, a user-friendly interface,

Based on a design by JM1SZY for 50 MHz that he developed using YO

Continuos coverage HF Transceiver by I6WJB & I6YPK

A 144 MHz kilowatt amplifier project details the construction and performance of a high-power VHF linear using the GU74b tetrode. This Russian tube, equivalent to the Svetlana 4CX800, is noted for its conservative datasheet ratings, performing closer to 800-1000W anode dissipation in practical applications. The design prioritizes compactness and achieves 1.2 kW output with only 20W of drive power, demonstrating a 70% efficiency at 2.5 kV plate voltage. The amplifier has been successfully deployed in demanding _EME_ (Earth-Moon-Earth) operations since June 1994. Challenges encountered during development included achieving stability with a grid-1 input configuration. The author, _CT1DMK_, opted not to publish the full design due to its complexity, suggesting it might be difficult for less experienced builders to replicate successfully. However, he invites direct contact for those with specific interest in the design. Future plans include a "144MHz GS35b compact amplifier" project, promising another kilowatt-plus design. This resource offers insights into high-power VHF amplifier construction and the practical application of specific power tubes.

Simplified U.S. frequency allocations table by K8ZT

Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.

The N2CKH travel special 300 Ohm ladder line convertable antenna

Some tens of very special audio files recorded during amateur radio activities like aurora traffic, meteor scatter, communications with ISS crew and the sound of various transmission modes that you can hear on HF and VHF bands

This FET preamplifier has been around for almost 25 years. It is extremely reliable and can handle several watts directly into either the input or the output without failure.

The page provides a detailed guide on building a successful 160 Meter short TX loop antenna, with specific dimensions and tuning instructions. It includes information on the design, construction, and tuning of the antenna, as well as the materials required. The intended audience is amateur radio operators looking to build an effective antenna for the 160 Meter band.

remote antenna switching project by EI7BA

Two types of home-brewed 12/20 Ampere 13,8volt power supplies, including detailed part lists by ON6MU

Demonstrates BBLogger, a **freeware** logging application designed for both amateur radio operators and Short Wave Listeners (SWLs). Developed by IK2VIW, IZ2BKT, and IK2UVR, this software provides comprehensive station management capabilities, including **CAT control** for various transceivers, integration with digital mode software like WSJT-X, JTDX, and MSHV, and robust QSL management features. The application supports a wide array of functions such as DX cluster interfacing, mapping, awards tracking (including custom awards), and direct integration with services like LoTW, eQSL.cc, and ClubLog for QSL confirmations and OQRS requests. It also includes utilities for ADIF to CSV conversion and vice-versa, catering to diverse logging and data management needs. Recent updates, such as version 13.1, introduce a web server for log management from any device, allowing remote access and control. The software has improved ADIF import capabilities, including time settings for duplicate QSO detection, and enhanced filtering options for log searches. Performance improvements include faster automatic updates and manager database synchronization, along with optimized log checking at startup. Earlier versions added support for FT8 and FT4 modes, refined OQRS integration with ClubLog, and expanded QSL/label printing functionalities, enabling users to select specific callsign types (OM, SWL) for printing. The developers emphasize compatibility with Windows 10/11 for full functionality, noting limitations when running on older operating systems like Windows 7 due to modern security protocol requirements.

2m SSB/CW-12.5 Ohm Yagis with extrem high gain and small bandwidth. These Yagis were constructed as ultra-light, portable Yagis with extrem high gain. They have small bandwidth and are working from 144,0-144,8MHz with good SWR.

How to make 450 ohm open feeder

DTMF decoder program that uses the sound card and FFT to decode DTMF by KB5RYO

The Windom is an Off-center wire multiband Antenna. The old version was fed just by a single-wire connected on 1/3 of antenna's overall length or with an open-line feeder (later versions). Here is another model with coaxial feeder, which is compatible with Solid States - 50 Ohm output transceivers .

EI7BA Multiband Cubical Quads projects, includes two elements quad antennas for 10 12 15 17 20 meters band. Performance considerations, detailed pictures and construction notes.

Effective HF Mobile Antennas Keith WB2VUO, explains difficulties on gaining antennas efficiency on lower bands with mobile antennas.

This antenna tuner is a multi-type matching system in the same box, which includes L - Pi and T networks.

High definition SSTV software for windows 2000, xp by PY4ZBZ

A 3 element DELTA LOOP on 20 meter, 4 on 15 and 5 on 10: my new beam (Just some good ideas)

FT857 and FT897 Interface PCB and schematic

A 13,8v/5Amp 78H05 based power supply for portable use. In this example used to power up a Yaesu FT-817

Suitable antenna for owners of an IC706 or FT817, 857 and other HF portable transceivers. You can an be QRV in a few minutes on all ham-bands from 80m to 6m and even on 2m by PA0FBK

This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files

A full wave 2-meter VHF omnidirectional antenna by ON6MU

The Inverted L antenna is a versatile and efficient design suitable for small gardens, allowing amateur radio operators to operate on multiple bands. This project outlines the construction of a 5-band inverted L antenna, which can cover HF bands effectively. The design is particularly advantageous for those with limited space, as it requires minimal ground space while providing good performance. The antenna can be easily constructed using common materials, making it accessible for both beginners and experienced hams. In this guide, GM0ONX shares detailed instructions on how to build the inverted L antenna, including dimensions and tuning tips. The project emphasizes the importance of proper installation and grounding to ensure optimal performance. Additionally, it discusses the antenna's compatibility with various transceivers and the potential for portable operation. This resource is ideal for hams looking to enhance their station with a multiband antenna that performs well in limited space.