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1993 QST Article of a 2 meter beam antenna by WB0CMT

Article shows how to develop a good external ground system to complete your station's protection.

Traps can be one way round multiband coverage without the need of an atu. Learn how to homebrew your own traps

When we think of Beverage antennas, we automatically think of several acres of land and lots of wire!

Technical questions answered about grounding techniques, in pdf file

About Stacking yagi antennas by OH1ZAA

How to solder PL-259’s compiled by K1VR

Weatherfax decoding software with modem

Yaesu FT-857 offers an availability of changing parameters through the hidden menu.

If you are looking for an easy antenna for your favorite band, you can't go wrong with an halfwavelenght dipole, all you need is 3 insulators and some wire

The FL-2100Z amplifier referenced in the following images is the 6-Band model covering 10m thru 160m (no WARC bands) and not the 9-Band version that included the WARC bands. Modifications, schematics and manual

N1TEV high performace regenerative receiver design

The Emtech ZM-2 Antenna Tuner is a nifty little portable transmatch for QRP (low power). It utilizes the well-known Z-match circuit, which is especially useful for balanced antennas (like dipoles and loops).

Expanding frequency coverage, transceiver Labtest by Christoph Petermann DF9CY

The page provides detailed information on coax stub filters for multi-transmitter setups, including specific lengths for different bands and types of coax. It also references additional technical notes for further analysis.

Assorted Grounding Hints and Kinks and Technical Correspondence, Grounding Techniques, Conductivity in the Cold, Cold Ground, Is Your Radio Equipment REALLY Grounded?

How to extend your Wireless Network by building a 2.4 gHz wifi cantenna

There are lots of good designs for matching transformers for receiving antennas. Make it yourself it's cheap and easy, and very high performance. This is the design used in the TRX-9 transformers.

Windipoles is a free passive real time filter simulator. Developed under Visual Studio .NET. No software installation required. Allows design, analysis, optimizations and plots, all graphically.

Schematic and pictures of a W7IUV preamplifier

G8ODE schema to reduce a half-size G5RV to 70 ft.

Homebrew a 2 meter 1/4 wave vertical antenna for the 146 mHz ham radio band

ARRL index of document about trapped antennas and notes on traps usage

If your IC-706MKIIG will not power up without even hearing a relay click, check the state of the HV line.

Remote Control Antenna Switch made with two circuits board

Here is how to adjust this popular tuner circuit so it transfers maximum power to your antenna without going snap

Gary Breed, K9AY experience with beverages on 40 meters

Ranger mods by WA1HnyLR, The TimTron

W4TI review the popular Yaesu FT 857 quadriband transceiver

A Mini Moxon antenna for 40 meters band project in a well done PDF document

What is ground?RF ground and the ground plane, how can I tell if I have a good ground? ground loops

This resource details the construction of a versatile CW/QRSS beacon, designed around a Microchip _PIC16F84_ microcontroller. The project provides a flexible platform for transmitting either standard CW or very slow QRSS signals, making it suitable for LF, VHF, UHF, and SHF applications. It supports two distinct messages, each configurable for speed (from 0 to **127** WPM for CW, or up to **127** seconds per dot for QRSS) and repetition within a six-phase sequence. The core functionality relies on the PIC's EEPROM, which stores all operational parameters, including message content, transmission speeds, phase configurations, and relay control settings. This design allows for parameter modification directly via programming software like _ICProg_ without altering the main program code. The project includes a detailed schematic, a component list, and an explanation of the EEPROM memory mapping for messages, speeds, phase settings, and inter-phase delays. General-purpose outputs (OUT1, OUT2, OUT3) provide dry relay contacts for external control, enabling functions such as power switching, antenna selection, or frequency changes. A 'TRIGGER' input facilitates controlled starts or continuous free-run operation. Sample EEPROM configurations illustrate how to program specific beacon sequences, including message content and relay states.

D3+ High Performance Antennas for Field Day. This article describes versatile broadband wire antennas. These antennas will double your effective radiated power over a dipole, will be easy and inexpensive to build and install, and will be simple to match.

Producers of Scancat, Copycat, Magic and Distributors of HOKA's CODE-3 and CODE-30 decoders.

Band-pass filters can be critical components in competitive stations. This setup may help put your station on the map.

Maldol MFB-300 all band HF vertical antenna review by Steve Nichols

Long path hf radio propagation is sometimes the best path to work dx, since the shortest path is not always the best path.

Compiling an extensive collection of technical information, the Repeater Builder's website serves as a critical resource for those involved in amateur and commercial repeater systems. It covers a broad spectrum of topics essential for the design, construction, and ongoing maintenance of these vital communication hubs, drawing from years of practical experience in the field. The site provides detailed insights into various aspects of repeater technology, including specific information on VHF and UHF bands, such as 2-meter systems. Users can find data related to repeater logic, control systems, and interfacing with other radio infrastructure, all presented with a focus on practical application. Authored by Kevin Custer, W3KKC, the content reflects a deep understanding of repeater operations and engineering, offering guidance that extends beyond basic setup to advanced troubleshooting and optimization.

The AMRAD Active LF Antenna. You can tune into LF activity with this easy-tobuild and erect active antenna. As a bonus, you get MF and HF coverage, to not to mention world-class performance

Java free space pathloss calculation and EME

This attenuator is worth your attention. Built like the proverbial brick outhouse, it's one you can easily duplicate by N9SFX Pdf file

Make yourself a Diplexer

A Comprehensive roundup of the most popular QRP transceiver kits on the market in recent years in PDF format

DF9CY Active Magnetic Antenna project

D-star technical requirements and documentation

A different approach can help you optimize attic-bound aerial by W6HPH

High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB

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

How to get the most from attenuators and preamps

DK7ZB 9 element antenna