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The NG7M Web Cluster, maintained by W7CT and NG7M, offers real-time DX spotting information crucial for amateur radio operators engaged in DXing and contesting activities. This service aggregates DX spots from various sources, presenting them in a user-friendly format accessible via both web interface and traditional telnet protocols. Operators can monitor band conditions, identify rare DX entities, and track propagation paths across multiple amateur radio bands. This cluster supports a wide range of operating modes and bands, facilitating efficient station operation for both casual DX chasers and serious contesters. The system integrates data from the Reverse Beacon Network (RBN) and PSK Reporter, enhancing its utility by providing automated CW and digital mode spots alongside manually entered voice spots. Access methods include a direct web interface for graphical display and a telnet connection for command-line interaction, catering to different operational preferences. The cluster's data stream is continuously updated, ensuring timely information for making critical operating decisions.

A lightweight ham radio antenna for Summits On The Air (SOTA) that deploys easily and is highly compact.

The Providence Radio Association Incorporated, one of the oldest radio associations in the world.

The North East Weak Signal Group (N.E.W.S.) website serves as the digital hub for an ARRL-affiliated regional club dedicated to _weak signal_ work across the VHF, UHF, and SHF spectrum, from 50 MHz up to light. It provides essential information for members and prospective enthusiasts, including the club's constitution and by-laws, details on officers and the board of directors, and a calendar of meetings and events. The site also features an application for membership, information on dues, and a membership roster, fostering a sense of community among its over 100 members. A significant feature of the site is its extensive archive of conference papers, including proceedings from the _Eastern VHF/UHF/Microwave Conference_ dating back to 2009. These papers cover a wide array of technical topics relevant to weak signal operations. The site also lists _50 MHz Beacons_ and _144 MHz and up Beacons_, along with links to other VHF and above resources, providing practical tools and knowledge for operators interested in pushing the boundaries of amateur radio communication.

This page is about the RSGB's Propagation Studies Committee, its work, services and current projects, together with guides to where to find more about matters relating to propagation on the Internet at all levels from introductory to professional. Watch this space!

Boom Microphone Headsets for use on amateur transceivers- assembled and kit form.

Thierry LOMBRY, ON4SKY, gives advice to amateurs about lightning protection of an hamshack, including pictures and links.

Designing and constructing portable wire antennas for HF operations, this resource explores several configurations including the _foldback dipole_ for space-constrained setups and an inductively shortened dual-band dipole for 20m and 40m. It details the calculation of inductance for shortened elements, providing a Visual Basic 6.0 program screenshot that illustrates determining coil parameters like turns and length for a **25.5 uH** inductor. The document emphasizes practical considerations such as adjusting wire lengths for optimal SWR, noting that a dual-band dipole achieved SWR below 2:1 on both 20m and 40m, with careful adjustment bringing it under 1.5:1. Further, the resource describes a half-wave antenna matched with a coaxial stub, a method often referred to as the _Fuchskreis_ in German amateur radio circles, to transform the high feedpoint impedance to 50 Ohms. This monoband solution, for a 20m application, uses a stub length of **2.98m** (0.216 lambda multiplied by coax velocity factor) and a shorted stub of approximately 48cm. The coaxial stub design is highlighted for its resilience to ground proximity, allowing it to be rolled up or laid on the ground with minimal SWR impact, making it highly suitable for portable QRP operations.

PIC micro controller based frequency counter with LCD readout

This is a page designed to help the EMCOMM operator thinking of going portable. It will describe a way of having VHF UHF HF voice and digital in one box

This resource, originally intended to detail the technical specifications of the **Clover** digital communications mode, currently presents a "Page not found" error. The _Clover_ mode was designed for conveying 8-bit digital data over narrow-band high-frequency radio channels, offering robust performance under challenging propagation conditions. Its design focused on efficient data transfer and error correction, making it suitable for amateur radio operators seeking reliable digital links. The absence of the page prevents analysis of specific technical parameters, such as modulation schemes, data rates, or error correction codes that would have been presented. Historically, Clover offered significant advantages in throughput and reliability compared to earlier digital modes over HF, often achieving higher effective data rates than modes like PACTOR or AMTOR under similar signal-to-noise ratios. Without the content, a direct comparison of its performance metrics or practical application scenarios is not possible.

Europeam SWL BCL Clubs organization

Wheaton Community Radio Amateurs (WCRA - W9CCu), Wheaton, Illinois

K6ODV Six Meter KW Amplifier Designs

Amateur Radio and SSTV Pasokon EZSSTV RAdio HAM Saw Proskan W95sstv Win95sstv Ham Software Radio MMSSTV shortwave listener Hamcomm interface Slow Scan Television Help with setting up SSTV website. G0HWC

This article includes an online calculator for a 3 element Yagi Antenna. The formula and basics theory of Yagi Antenna are also explained with examples.

Anderson Power Products specializes in high-current interconnect solutions, featuring products like the _Industrial Battery Connector_ (IBC) DIN-style connector for advanced battery charging applications. Their product line includes the SBS®XPRO connector, designed with three power contacts and eight signaling contacts, suitable for battery-powered equipment in harsh environments. The new Saf-D-Grid® Max connector supports up to **55A** and 600V, providing high power density in a C19 footprint, and is UL-rated for disconnect up to **40A**. They also offer IP68-rated SBS®X-75A connectors, engineered for waterproof high power and signal transmission. The company provides pre-crimped cable assemblies, simplifying proper contact maintenance between cables and connectors. Anderson Power Products serves diverse sectors including material handling, electric vehicles, telecom, office equipment, and power management, emphasizing reliable and rugged connector designs. Technical documentation and a comprehensive power connector catalog are available for detailed product specifications.

Performance chart of VHF antennas in a stacked array

Located in Wynne Arkansas. Repeater 147.375(107.2he Cross County Amateur Radio Club is an ARRL Affiliated Special Services Club. The Club is located in North East Arkansas and is based in Wynne Arkansas which is the County seat for Cross. With members from Cross County and surrounding Counties and communities in Eastern Arkansas the club works to serve our communities as well as the Amateur Radio Community.

Installing the optional TCXO, named SO-3 in the Kenwood TS-590S by TK5EP

KA7OEI article on homebrewing Yagi UDA antennas with practical suggestions and designing notes.

Link page to all kinds off amateurradio related sites

Magnetic Loop Antennas for The Radio Operator with Limited Space, a two part series of articles on how to construct a magnetic loop antenna, including directions on selecting high voltage tuning capacitor

Computer Control and Soundcard Interface for the Icom IC 706

Antenna tuners are crucial for matching the impedance of antennas to the 50 ohm output impedance of transmitters. The _LDG Z-11 Pro_ is an automatic antenna tuner designed to handle up to 125 watts, making it suitable for a wide range of amateur radio applications. Its compact form factor allows it to pair well with transceivers like the _FT-857D_, providing a portable solution for operators who frequently change locations or setups. The tuner covers the 80 through 6 meter bands, offering a broad impedance match capability. Although it struggles with some loads, it performs well with typical ham antennas, even managing to load an 80 meter dipole on 6 meters. One of the standout features of the _Z-11 Pro_ is its 8000 memory slots, which enable it to remember successful matches and quickly retune when revisiting frequencies. This memory function significantly reduces tuning time, often to less than half a second. The unit is well-constructed, with improved pushbuttons and a sturdy metal case that offers good shielding. However, users should be aware of potential RFI issues and the lack of a power switch, which requires disconnecting the power cord to turn off the unit completely. Overall, the _LDG Z-11 Pro_ is a user-friendly and cost-effective tuner, offering advanced features that enhance its utility in various amateur radio setups.

Everything you need to know to understand and use PSK-31 by George Rothbart, KF6VSG Presentation to PACIFICON 2001

Dipole, inverted V, full wave loop and grond plane antenna quick reference plans

One hundred and fifty words per minute (WPM) is a configurable speed setting in this online Morse code translator, which facilitates bidirectional conversion between plain text and **Continuous Wave (CW)**. Users can input text to generate corresponding Morse code, or enter Morse code using dots and dashes to receive a text translation. The tool supports various alphabets, including Latin, Cyrillic, Ukrainian, Hebrew, and Arabic, broadening its utility for international communication. The platform offers multiple output methods for the generated Morse code, including audible playback, visual flashing, and device vibration. Advanced configuration options allow for precise control over the sound's pitch (frequency), volume, and overall speed, including a **Farnsworth speed** setting. This flexibility enables users to customize the learning or communication experience to their specific needs. Additional features include the ability to save the generated Morse code audio as a WAV file and to create shareable links for messages, which can be sent with or without the accompanying text. The interface is entirely web-based, built with HTML5 and JavaScript, ensuring broad compatibility across modern browsers.

T-Match Network Antenna Tuner for a wide range of complex antenna loads between 1.8 and 30Mhz at moderate power levels by VK6YSF

Download the Yaesu VX-8R Cheat Sheet PDF File

The Speaky HF SSB transceiver and other homebrew projects Homebrew of radio equipment, antennas, tuner, etc.

Search K1N On-Line log

Specifications, images and product reviews for the yaesu ft-450 (at) mobile amateur transceiver

This almost trivial circuit may be used to charge a pair of AA or AAA sized rechargeable battery cells from sunlight.

TS-570 series specifications at universalradio

My Top Five Backyard Multi-Band Wire HF Antennas. A selection of the top 5 HF wire antennas for the backyard and for multi-band operation

An effective multiband HF Vertical antenna, used as remote station antenna. Pictures and review of this vertical HF antenna by VK5SW

A post about the construction and measurements of a Resonant Feedline Dipole cut for the 10M band

Discussion group of amateur radio operators that operate ham radios from their bicycles.

Photo construction manual of a portable antenna made with two heavy duty whips by buddipole. In this article has been implemented a 50 MHz portable dipole.

VHF, UHF and Satellite Antennas for Government, Commercial and Amateur Radio Made in Nebraska USA

Products for electronic production service repair and testing

With all the wire you have out, you may run into a problem with static buildup on the antennas. This static may try to make its way into your receiver, causing you major problems and damage that can run into a lot of money.

Used test equipment, used electronic test equipment, refurbished test equipment and other pre-owned electronic test and measurement equipment to buy or rent.

This graphics-intensive program designs and analyzes active quadrature ("90-degree") networks for use in SSB transmitters and receivers.

Third-order Cauer filters can boost performance of multi-transmitter, multi-operator contest stations to the next level. The filters are practical and you don’t need expensive test equipment to align them.

Relay substitution tutorial, power amplifier tuning and Technical Characteristics

Specializing in vintage and antique speaker repair,recone and restoration.

Log Online for T02TT DX Pedition

Windows NDB searcg and log editor utility by VE3GOP