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Fast Scan Amateur Television in Southern California, Nevada, Arizona, New Mexico, Indiana and soon in Illinois. -
This project hereby presented is a complete HAM radio simplex 'smart' repeater, built around a Motorola GM-350/950, Arduino NANO board and a WINBOND audio recording integrated circuit -
Club activities, news and newsletter Ham Chatter Online features a member each month. Field Day pictures, etc. Home of VOA transmitter sites. Club calls, W4AMC & W1VOA Greenville, NC -
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The purpose of this article is to describe in detail the Morse code keys made by the Brown Brothers Machine Company (BBMC), to aid the serious key collector in identifying each model made by this fine company. -
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About ham radio hobby with hundreds of related links -
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A simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator -
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Demonstrates the _SQUIRL Field Day Logger_, a specialized software tool designed for efficient contact logging during the annual ARRL Field Day event. The resource details its core functionality, which includes real-time logging to easily readable text files, with filenames structured by callsign, band, and mode (e.g., K8DAA-20M-SSB.txt). It highlights features such as a real-time history grid of previous contacts, a dynamic USA and Canada map displaying contact locations, and a duplicate checker that provides audio notifications and pre-fills class/section data for previously worked stations. The software also includes an ADIF export function, enabling users to transfer logs to other general-purpose logging programs. The software's design emphasizes simplicity and ease of use, allowing for rapid on-the-spot training, as noted by users like W4CMB. It supports various operating systems, including Windows 98 through 8, and has been successfully run on Linux via _Wine_. Key usability enhancements include a "double-size" feature for improved readability and a "Space Mode" for quick field navigation. The version history indicates continuous development from 2001 to 2013, with significant additions like the real-time Field Day Map in 2003 and ADIF export in 2004, which allows for seamless integration with other logging platforms. -
Reduces line noise on TS-850 -
Homepage of Hong Kong's elite group of DX'ers -
This is a simple portable 2-meter J-Pole antenna. You start with a piece of 450-Ohm Ladder Line -
Allows you to automaticaly upload ARGO screen captures to your webpage in a convenient way. by ON7YD -
This Duoband-Yagi has a boom of 3.60 m and 3 elements for 10 m 4 elements for 6 m and one feedpoint with 50 Ohm -
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Links and sources of information about our club in Ventura County, California -
Dedicated to 50MHz and 144MHz. Online 2m and 6m logs. Real Audio sound clips of Tropo, Aurora, Sporadic E, Meteor Scatter, TEP and F2 Propagation. -
The Smith Chart program with its extensive Help files. Written in Visual C++ ver 1.5, it runs in Windows 3.1 and later by w9dmk -
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VHF, ms, aurora, es, photos, audio, link, soft and more. -
conversion of low band VHF AWA RT-85 transceiver down to 6 metres. -
A lightweight portable vertical antenna for 40m -
Construction and analysis of a low cost omnidirectional horizontally polarized antenna for 144 MHz, including notes on halo antenna stacking -
A homemade 10 element Yagi Beam Antenna for 50 Mhz by Rod Mackintosh, a NBS Yagi on a 13.2 metre boom. -
Here is a well documented plan of a 20m-10m compact magnetic loop antenna. Article includes lots of pictures and technical details published by KP4MD -
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 -
An online javascript calculator for cubical quad antennas, simply input the resonating frequency to calculcate up to a five element quad antenna. This quad antenna calculator let you determine the total length of each element and spacing among elements. -
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80-meter peilontvanger / receiver includes printed circuit sample and list of components -
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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. -
KyteLabs InfoBase - Electron Tubes & Valves Data -
JL is a free contest logger written entirely in Java. Run under Windows, Linux, Solaris, and MacOS X by W1JQ -
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Located about 25 miles south of Boston, MA, near the City of Brockton. -
Information and news about Amateur Radio in Scotland -
Adventure Radio, articles and reviews. This site has a whole host of ham related information. -
DL7JV Christian report his direct experience on magnetic antennas -
Modifying consumer off the shelf wireless LAN devices for specialized amateur use -
Contest team 9A7A, basic info and photos about our activities -
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. -
10 meter propigation beacon project -
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Dragoslav Dobricic, YU1AW antennex article on influence of Boom on frequency performance and how compensate it -
High pass filter schematics for TVI and examples of finished filters -
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.