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The antenna described here is a direct-connect dual-rectangle beam for use on 70 cm between 440 and 450 MHz

Polish amateur radio dealer for Yaesu Icom Motorola Diamond MFJ Daiwa Lafayette

EggsHam is a PalmOS application that generates (and grades) _practice_ amateur radio licensing exams. It is for people interested in obtaining an amateur radio license in the US, who want to practice for the Technician, General, or Extra written exam.

Amatuer Radio QSL Cards. Full Color QSL and Eyeball Cards

Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.

Your beginner's guide to shortwave radio, include an up to date blog and news about products and events.

WAU Worked all Ukraine award by UT4UW

The European DX Foundation (EUDXF) is the first and only all European Foundation to support DX activities. It is a non-profit organization established in 1986 in the German town of Bad Bentheim

Foothills Amateur Radio Society

Firsts pictures of Icom IC-9100 taken at Tokyo HamFair 2009

The safe RS232 CAT interface and PA buffer for Elecraft K2

Radio Clock listens to radio time signals from your radio and corrects the time on your PC clock

The Western Washington DX Club is an organization of Amateur Radio (HAM) operators who have a special interest in DX or distance communications

A bycicle ham radio station setup, with full band coverage

In his back office section, ON4SKY, initiates in a few articles the beginners in the art of QSLing and award chasing.

A hombrew QRP transceiver for 40 meter band with many pictures, circuit and sound recording of some QSOs made with this Rig consisting of 5 transistor and one chip.

Kenwood TS-450S/TS-690S MARS modification video

Manufacturing distributor of infrastructure products for the telecommunications industry; antenna mounts, ice bridge, cable ladder, ground bars, weatherproofing, exothermic, safety equipment.

Radio Communication Equipment store in Wien Austria

Sams continues the tradition with the publication of new manuals every month, covering the latest in Televisions, including HDTV, Projections TVs, and coming soon, LCD monitors.

An home made cw transceiver by PA2OHH

With VHF Hamradio Software

ZS6YI modifications for the Icom IC7000

Learn morse code with morse machine, A Fully Automatic Morse Code Teaching Machine first described in a May 1977 QST. Free for Windows MacOS Linux and DOS

Tektronix Oscilloscpe home page, feature tekexpress DSA series products

Website for radio Amateurs in the Hastings, Peterborough, and Northumberland Counties of East Central Ontario, Canada. Propagation information as well as antenna designs and home brew projects and Club News. Many links to Amateur Radio information

An Offset Attenuator for fox hunts.

The GM4JJJ VHF and EME pages document David's extensive work in Earth-Moon-Earth (EME) communication, specifically on the 144 MHz band, and his involvement in amateur radio astronomy. The resource details his station setup and operational experiences, providing insights into the technical challenges and rewards of bouncing signals off the moon. It offers a glimpse into the specialized equipment and techniques required for successful EME contacts, a niche but highly rewarding aspect of amateur radio. David's content shares practical applications and field results from his EME endeavors, which can be particularly useful for hams contemplating or actively pursuing moonbounce operations. The information, while not a step-by-step guide, implicitly compares the complexities of EME with more conventional VHF/UHF operations, highlighting the significant power and antenna gain necessary to overcome path losses. This resource serves as a testament to the advanced capabilities achievable in amateur radio.

Hams with web cams database with net and roundtable information.

Freeware , 3.8 MB executable that allows the conversion of some old DBF log files (DXLog, EasyLog, LogPlus, TopLog, TurboLog TotalHAM92) to the ADIF Format by TRX-Manager authors

Draw static response time of an audio system. Originally intended for loudspeakers tests, is also a great tool for looking at microphone equalisation.

An interactive repeater map that uses google maps to display location of repaeter types available in Italy by Andrea IW0HOG

The Texas DX Society, founded in 1970, is an organization of radio amateurs in Houston, Texas who have a primary interest in DX chasing and contest operating on HF, VHF, and UHF

This site serves a community of volunteer and paid professionals in Search & Rescue and Civil Air Patrol who save lives and Amateur Radio enthusiasts who use DF skills as a hobby. We provide antennas and other resources for people in these fields.

How to receive images from orbiting noaa weather satellites using simple receiving equipment and a computer by G4ILO

The ARRL Foundation is devoted to providing valuable programs to serve the ham community, whether those served are ARRL members or not. Established in 1973 by the American Radio Relay League, Inc. (ARRL) as an independent and separate 501(c)(3) organization, the ARRL Foundation administers programs to support the Amateur Radio community. The ARRL Foundation advances the art, science and societal benefits of the amateur radio service by awarding financial grants and scholarships to individuals and organizations in support of their charitable, educational and scientific efforts. Funded entirely by the generous contributions of radio amateurs and friends, ARRL Foundation administers programs for Amateur Radio award scholarships for higher education, award grants for Amateur Radio projects, and award special Amateur Radio program grants for The Victor C. Clark Youth Incentive Program and The Jesse A. Bieberman Meritorious Membership Program.

Home of the C3I Amateur Radio Group

A Simple and Flexible Tuner for QRP Craig LaBarge, WB3GCK

Radio Budapest is the external service of Hungarian Radio Company Limited, the public service broadcasting organisation.

Presents the _K7AR DX NorthWest Web Cluster_, an online service for amateur radio operators to access real-time DX spots. The resource functions as a web-based interface, enabling users to monitor current band activity, identify rare DX stations, and track propagation conditions across various amateur bands. It aggregates spotting data, making it accessible without requiring a dedicated telnet client, thus simplifying access for many hams. The cluster integrates with the broader DX spotting network, offering a continuous stream of reported contacts. While specific performance metrics are not detailed, such web clusters typically update spots within **seconds** of submission, providing timely information crucial for DXing and contesting. Its utility lies in offering a quick, browser-based overview of the airwaves, comparable to traditional telnet clusters but with enhanced accessibility.

Collection of radio mods for Kenwood TS-870

Repair & Restoration information in UK

A simple to build full length 20/40 dipole antenna to be used in inverted vee configuration

General article on Baluns at myantennas.com, what is a balun and when to use baluns

Community blog at livrjournal

Metro Vector Network Analyzer is a custom antenna analyzer designed and produced by IZ7LDG.

NHARC serves the Amateur Radio community in the greater Pittsburgh area USA.

A four elements quad antenna for 144 MHz made with PVC pipes

Demonstrates various practical amateur radio projects and technical discussions through video episodes. One episode details cutting and retuning a _1/4 wave shorted stub_ from 101.7 MHz to 107.5 MHz to safeguard a transmitter's driver stage, alongside insights into advanced _160-meter antenna systems_ like eight-circle arrays and beverage antennas. Another segment covers upgrading firmware on an _ATS-20+_ receiver using AverDudes for improved display and functionality, and a detailed guide on using D-Star DR mode on an _ICOM ID-52A_ for international repeater programming. Additional content includes a deep dive into _OpenHamClock_ as a potential replacement for the HamClock project, updates on _Raspberry Pi 5_ running Trixie OS, and a review of the Choyong LC90 Internet radio with AI integration. The series also features "Ham College" episodes, which meticulously prepare viewers for the Technician Exam by covering topics such as antenna and transmission line measurements, SWR interpretation, and the functions of basic electronic components like rectifiers, relays, and transistors. Practical advice on coaxial cable characteristics, dummy loads, and proper soldering techniques is also provided.

Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna.