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This free program calculates the location of any locator. It calaculates the distance, azimuth, longitude and latitude between two Maidenhead locators. Converts longitude/latitude coordinates to Maidenhead locator Converts Maidenhead locator to longitude/latitude coordinates

Fellowship of Christian Amateurs meeting M-F on 40 meters

A Free Prefix, DXCC and Locator program for Windows

The purpose of this web page is to try to investigate some of the issues around ICOM IC-746PRO reported by many radio amateurs through out the world; and unfortunately not properly taken care of by ICOM.

Radio scanning resource site for scanning enthusiasts in the new jersey and new york area.

80-meter peilontvanger / receiver includes printed circuit sample and list of components

Pegasus RX-320 and other N4PY software for tentec radios

Microwave general web site by G3PHO

An open collaborated project for creating base libraries and applications to allow the passing of information from the host computer to the D-STAR radio and vice versa.

If you need a cheap and easy to construct Subtone Generator for EU-model VHF-UHF rig, here is a solution that works very well.

H.A.R.C. Radio club in in Phila. Pa. area

KyteLabs InfoBase - Electron Tubes & Valves Data

A selection of alphabets used, particularly by ham radio operators, to spell out words

List of european IOTA Prefixes

JL is a free contest logger written entirely in Java. Run under Windows, Linux, Solaris, and MacOS X by W1JQ

The KP3AV Systems website offers a detailed listing of amateur radio repeaters across Puerto Rico, including operational frequencies and tones for VHF and UHF bands. It features sections dedicated to digital modes like DMR and C4FM, as well as information on FRS, GMRS, and MURS. The resource also includes articles on emergency communications protocols and provides access to Spanish-language manuals for various radio equipment. Recent content covers the new open-source FT2 mode for WSJT-X Improved, upcoming 60-meter band frequency allocations and power restrictions effective February 13, 2026, and discussions on 2-meter contacts with Desecheo Island from Puerto Rico. The site also presents U.S. amateur radio band plans and highlights local contesters like Manuel WP4TZ, offering practical insights into portable operations and contest participation.

Located about 25 miles south of Boston, MA, near the City of Brockton.

Adventure Radio, articles and reviews. This site has a whole host of ham related information.

Information and news about Amateur Radio in Scotland

DL7JV Christian report his direct experience on magnetic antennas

Eham FT-1000MP review

Modifying consumer off the shelf wireless LAN devices for specialized amateur use

Contest team 9A7A, basic info and photos about our activities

10 meter propigation beacon project

VE3BDB's personal page serves as a dedicated resource for members of the Radio Amateurs of Canada (RAC) residing in the Ontario South Region. Bob Cooke, VE3BDB, previously held the position of Director for this region, offering localized support and information pertinent to the RAC's activities and initiatives within Ontario South. The page likely covered regional news, events, and specific guidance for local hams, reflecting his role in facilitating communication and engagement among the amateur radio community in that area. While the page is no longer active and Bob Cooke has transitioned from his regional director role to RAC Vice President for Field Services, its original purpose was to centralize information for Ontario South hams. The content would have been tailored to address regional concerns, promote local ham radio activities, and provide updates relevant to RAC members in that specific geographic area, directing users to the main RAC website for current information.

Dragoslav Dobricic, YU1AW antennex article on influence of Boom on frequency performance and how compensate it

Satellites and Oscar 40, Microwave and ATV

A really simple LF receiving loop antenna

Alan Applegate (K0BG) article on mobile oprtations

A circuit for a 5 milliwatts super QRP morse code transceiver by VE2ZAZ

A 50-ohm generator feeding a 50-ohm line connected to a _quarter-wave transformer_ (150 ohms) terminated in a 450-ohm load is analyzed to understand transient behavior. The paper meticulously tracks voltage and current waves, reflection coefficients, and power levels through a sequence of events, starting from quiescent conditions. It details how incident and reflected waves combine and interact at impedance discontinuities, illustrating the dynamic changes in impedance and SWR at various points in the system. The analysis reveals that the impedance at the interface between the 50-ohm line and the 150-ohm transformer changes from 150 ohms to **64.3 ohms** after the first reflected wave arrives. Subsequent reflections cause the impedance to asymptotically approach 50 ohms, reaching **53.22 ohms** after five wave terms. The study also examines the generator's reaction to transient SWR changes, noting that a 3:1 SWR can temporarily reduce generator output to 0.75 watts, but these effects are temporary and diminish as the system approaches steady-state conditions.

High pass filter schematics for TVI and examples of finished filters

A magnetic loops for HF pedestrian mobile project by VK3YE

We intend for this page to tell our story as well as be a resource for other "hams"

The Double Bazooka Dipole is a very efficient single band antenna which is very quite,and does not require the use of a balun. This antenna consists of coax (RG58) with the shield split at the center and the feedline attached to the open ends.

A vertical antenna for Six Meters band

conversion of low band VHF AWA 25M-22 carphone onto 6 metres.

This is the homepage of Kayalpattinam Ham Radio Society (VU2 KYP) - Ham Radio Society from Kayalpattinam, Tamilnadu, India

Windows Magnetic Loop antenna design software by DG0KW in Detusch

A home made project, scan and monitor the 2.4 GHz band using a common MMDS downconverter.

At LCWO you can learn Morse telegraphy (CW) online in your browser, use Koch Method, compare your results with others, speed practice and more

Mounting on Roof or at Ground Level? Why ground plane antenna works better at lower level.

based on an FT-1000MP Reflector discussion with Bill Heinzinger, W9OL, 15/16 November 2002

Article by VU2GT about VHF antennas, how to evaluate performances and models.

WAU Worked all Ukraine award by UT4UW

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

Over 130 years after its inception, Morse Code remains a fundamental skill for many amateur radio operators, enabling efficient QRP operations, DXing, and contesting. This resource provides an in-depth look at the **Koch Method** of Morse training, a widely adopted technique that emphasizes high-speed character recognition from the outset. It details how this method can significantly accelerate proficiency, moving beyond traditional, slower learning approaches. The site also delves into the rich history of amateur radio, presenting articles such as "Radio on the Rio," which chronicles local ham activity in Socorro, New Mexico. Another piece, "The Russian Woodpecker," recounts the Cold War-era efforts of hams to counter Soviet over-the-horizon radar interference on the HF bands. Furthermore, the resource explores the fascinating intersection of ham radio and radio astronomy, highlighting the direct lineage between amateur experimentation and the development of modern radio telescopes like the **Very Large Array (VLA)**. It also includes an introduction to the 6-meter band, often called "The Magic Band," detailing its unique propagation characteristics and suitability for no-code licensees seeking long-distance contacts.

The Yaesu FL2100Z is a HF linear amplifier rated for 1200W PEP input, and using two 572B triode tubes. This article explores the recommended operating conditions, and alternatives.

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.

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.