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Take the mystery and mystique out of standing wave ratio. QST Article by K5DVW

This article will help to unravel some of the mysteries as well as giving useful operating tips to maximize your chances of working that rare station

Radio communication equipment installation recommendations

A Working analysis of the gamma match problem that gives useful practical results in a article dated April 1969.

An Off-center-feed antenna that covers 80, 40, 20, 17, 15, 12, 10, and 6 meters

Cheap Antennas for the AMSAT LEO Kent Britain WA5VJB

A free to download and print, paper log sheet useful for portable amateur radio operations, in a PDF file.

Every ham needs an RF power meter. Here is a high performance unit to build at home.

Notes on Axial-Mode Helical Antennas in Amateur Service. Helix Basics, Modeling Issues, and Short Helical Antennas Over Perfect Ground

How to operate on 10 and 20 meters in limited space with this trapped dipole.

This document details the design and construction of a Vinecom 6N4 dual-band Yagi antenna for the 50MHz (6-meter) and 70MHz (4-meter) amateur radio bands. The antenna features 9 total elements (4 elements for 50MHz, 5 elements for 70MHz) on a 4.236-meter aluminum boom. Computer simulations using MMANA software predict 7.21 dBd gain on both bands with front-to-back ratios of 16.01dB (6m) and 15.37dB (4m). The design uses 12.7mm diameter elements mounted on a 32mm square boom, weighing 5.7kg total. Practical measurements with an MFJ-269 analyzer confirmed good SWR performance across both bands after element length adjustments.

The document provides a comprehensive overview of baluns, which are devices used to connect balanced loads, like dipole antennas, to unbalanced inputs, such as coaxial cables. It covers various types of baluns, including voltage and current baluns, and their design, construction, and testing. The text discusses the importance of baluns in preventing RF currents on coax shields and their applications in Ham radio setups. It also includes practical advice on selecting and using baluns based on antenna impedance and power ratings, along with detailed performance evaluations and construction tips for different balun configurations.

ARRL Lab notes, article by WB8IMY on helping choosing the best transceiver for your needs.

Pipe your signals to 146 and 445 MHz with one antenna!

A PDF presentation of a home made moxon antenna for 50 MHz 70 MHz and 144 Mhz. The project is mainly out of surplus plastic Plumbing pipes and clips etc, and also details of how the dimensions were calculated.

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

If you have space constraint at your QTH for a HF antenna, you can try contructing this HF magnetic loop antenna for 40-20 meters bands

JT65 is a digital protocol intended for Amateur Radio communication with extremely weak signals. It was designed to optimize Earth-Moon-Earth (EME) contacts on the VHF bands, and conforms efficiently to the established standards and procedures for such QSOs.

A bowtie antenna is a type of antenna that reputedly provides higher gain at lower radiation angles than a center-fed dipole antenna at heights considerably less than 1/2 wavelength above ground.

An active receiving antenna for 10 KHz to 20 MHz, a very small sized antenna with excellent performances in noise to signal ratio.

This document contains the detailed instructions to build a homemade lindenblad antenna using a twin-lead as dipole elements. This document contains 9 pages and includes a detailed construction sequence and some drawings to build this antenna for UHF and VHF ham radio bands

By Jim Davey WA8NLC

Utility program to verify, merge, and sort standard 2-line orbital elements files

Original Tuna-Tin 2 QRP CW transceiver article by W1CER

Homebrew a compact yagi antenna for 14 Mhz suitable for those with small plots based on a design by AB4GX

Broadcasting your radio from your home using the SHOUTcast Radio DNAS Application

A home made yagi antenna featuring 6db forward gain and 22 Db front back

A sourge arrestor for PL 259 connectors. A voltage surge arrestor to limit the voltage that may come back down the wire or coax after there has been static build up

The Considerate Operator's Guide shows frequencies generally recognized for certain modes or activities (all frequencies are in MHz).

Using MFSK mode, 98 Kb PDF doc, taken from QST January 2001

A 21 MHz Four Square Beam Antenna This popular antenna for the lower bands, can also work well on 15 meters, QST Article

A solutiom for the Ameritron AL-811(H) RF power amplifier, burnt panel meter lights. A common failure with the Ameritron AL-811 and similar amplifiers is that the panel meter lights burn out prematurely. These bulbs are usually integrated into the actual panel meter. The solution for this is to provide the meter backlighting with LEDs.

Build this cheap and easy satellite downlink antenna

Adding extra directivity to the Moxon Rectangle for 6m, 4, and 2m

Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor

Service manual in PDF Format for the Yaesu FT-7800 transceiver

Yaesu FT-450, FT-950, FT-2000, FT-5000, FT-9000 backup and restore Program for win32, requires login to Yahoo Groups

An end fed 20 meter half wave antenna

VHF UHF diplexer by G8MNY

A moxon rectangle for 50 Mhz band

An 80 meter band vertical loop antenna setup

Part 2 You're now much closer to saying goodbye to your unwanted signal problems!

A compact antenna for 160 meters, suitable for hams tha want operate top band buh have a limited space

W1AW code practice transmissions for the dates and speeds indicated. The files are in MP3 format

A 2-metre Quad antenna project by K6WXA in PDF file

A PDF presentation about Amateur Radio and Linux by By: Dave Mamanakis. A beginners guide to Linux for radio amateurs, this presentation cover basic concepts of the open source operative system, from the basic installation to the setup of ham radio programs.

The Super Check Partial database files provide a list of callsigns used by active contesters. The data comes from Cabrillo logs contributed by contesters themselves. Contributed logs from the past 24 months are used to create the database. These logs are combined and filtered so that they result in a fairly good (but not perfect) list. The files do not contain any QSO data, such as state, CQ zone, Maidenhead Grid Locator, etc. The dta files can be used with CT, WriteLog, TRlog, SD, N1MM Logger, NA, Win-Test, and others

Lage collection of 6 Meters and 2 meters QSOs, recorded in real audio format by OE3MWS

An home made vertical dipole antenna made with simple material. The antenna has a total length of aproximately 16 feet. In this article appeared on June QST 2019, the author explain how he reached the optimal confirugation changing and adjusting the lower part of the antenna, trimming and spacing correctly the copper wire. PDF File to downloas