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A model of a practical Ruthroff 1:4 balun - The 1:4 balun is of particular interest because it underlies many other configurations, and understanding it helps towards understanding the other Ruthroff balun configurations.

The Ultimate transmatch - Usage and benefits of transmatch. A pdf document from a QST article made available for novices and beginners by ARRL

Ultimate Portable HF Vertical Antenna - A light and compact antenna that is easy to build, and easy to find parts for. Band coverage is 60 through 10 meters.

Speedometers SWR Meters and Smith Charts - Have wondered why a Smith chart has such strange grid lines. Believe it or not, there is a logical progression from Speedometers to Smith charts that will make the Smith grid crystal clear.

A screwdriver antenna in a fixed install Priority listing - Tired of tuners and wires? Put up a screwdriver antenna in a fixed install for multiband operation (80m to 10m) with low SWR. No tuner is needed!

PI4ZI Contest group - the Netherlands - The group started in 2001 as a small group of enthousiast hams, in 2003 the group has been grown to 20 serious active members.

DA1BT Bitburg American Radio Club (BARC) - A group of American amateur radio operators who are living in Germany and come together to participate in amateur radio activities

WAE-DX-Contest - The Deutscher Amateur Radio Club (DARC) invites radio amateurs world wide to participate in the annual WAE-DX-Contest. CW SSB and RTTY Contests

BARTG RTTY contests - RTTY Contests HF and Sprint

SARTG New Year RTTY Contest - Sponsored by the Scandinavian Amateur Radio Teleprinter Group

YO4PX Francisc Grunberg blog - Articles about Amateur Radio, own writings and translations: history, DXpeditions, contesting and DXing ethics, Codes of Conduct, Suggestions for Pile-ups, Suggestions for Contesters, the most wanted DXCC entities.

HamToons - Ham radio cartoons - Amateur radio cartoons by Woody Epp W7EPP

Las Vegas Metro Police Department 24/7 Scanner  ^pop - Las Vegas, NV Police scanner. It is 24/7 and live.

GIGAVAC Ham Radio Relays - Gigavac is a leading designer, manufacturer, and worldwide seller of contactors and high voltage relays using vacuum, gas filled, and high voltage reed relay technology. hv relay applications information with cross reference charts for kilovac / tyco, jennings, and crydom part numbers.

Kits and Parts dot Com - Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists

RFSM-2400 Digital Mode - A recent digital radio protocol. Based on a freeware soundcard-based Radio Frequency Software Modem. Work under standart MIL-STD-188-110A. Maximum speed 2400 bit/second. Signal bandwidth: 0,3-3,3 kHz (standard mode) and 0,3-2,7 kHz (non-standard mode).

Citizen Weather Observer Program - A private-public partnership with three main goals to collect weather data contributed by citizens; to make these data available for weather services and homeland security; and to provide feedback to the data contributors so that they have the tools to check and improve their data quality

UK Radio Amateurs Annual CW Table - The purpose of the table is to encourage CW activity on the HF bands and six metres. Each year participants start afresh and work as many DXCC entities on each of the ten bands as possible between 0000Z on 1st January and 2400Z on 31st December

WM2U's PSK31 Page - An interesting article on PSK31, includes informations on interfacing to sound cards, troubleshouting, list of psk31 softwares and some historic backgrounds.

Work satellite with single IC-706MKIIG - You wanna try to work modern satellite like AO-40 but have only one rig ICOM-706MKIIG ? This article will help you.

Crystal Radio Supply - Offering Crystal Radios, Kits, Parts, and Supplies for the Radio enthusiast. Your source for free powered radios.

glfer - glfer is a program for reception and transmission of QRSS/DFCW signals. It is composed of two main parts: the spectrogram window, where you can see the spectrum of the received signal vs. time the transmission functions, to emit cw characters at a slow but precisely controlled speed, using the QRSS (slow CW) or DFCW (Dual Frequency CW) modes

HourWorld World Clock - HourWorld is a program with rich graphics that can show you what time it is in a certain part of the world, and well as demonstrate what is actually looks like over the globe.

Pro Key Set - This small program helps you to edit the CW memories of your Icom 756Pro, 756Pro2, 746 or 746Pro rig. On startup it reads the current memory contents and displays it. You can edit the text and store the memories individually or all 4 together

Some Tips on Sound Card Interfacing to Your Rig - Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA