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Based in Stone Mountain Georgia

The Union Métropolitaine des Sans-filistes de Montréal (UMS) operates daily nets on **VE2REM** 147.015+ T103.5, **VE2RYV** 146.655- T141.3, and **VE2RVK** 145.430- T141.3, alongside Echolink VE2UMS-L and DMR TG302273. This Montreal-based club, representing hundreds of radio amateurs, provides information for those interested in amateur radio and serves as a communication hub for its members, including a regularly visited ham radio flea market section. The site also highlights significant club initiatives like the AREDN Mesh Network modernization project and an innovative after-school program. The UMS website details upcoming events such as the 2026 sugar shack invitation, Field Day 2025, and monthly meetings scheduled for September 18, 2024. It also features a live log sheet section and a WEB SDR, offering practical tools for members and visitors. The club's president, Bruno VE2VK, extends a welcome, emphasizing the UMS's role in fostering amateur radio in the greater Montreal region, with contact information provided for inquiries.

The K7ICU repeater system is situated about 500' above metro Tucson, at the base of the Catalina Mountains. It is an open system providing coverage to the greater Tucson area.

Based in Katy Texas

Discussion group about RTLSDR Dongles, software support and hardware mods for these Software Defined Radio systems based on RTL2832U

A QRSS beacon on 30 meter band project wind and solar powered based on a loop antenna.

British ham radio antenna products manufacturer, base and portable antennas, mobile antennas, baluns, masts, production is mostly based on wire and whip antennas

RadioMasterList, a comprehensive receiver and transceiver directory. Performances and specifications for every radio set

PilotMORSE is a great home solution for private pilots or aspiring professionals who want to hone their Morse code skills used to identify VORTACs, localizers, and marker beacons. PilotMORSE takes you through the alphabet with an advanced neural network algorithm that adjusts the pace of presentation based on your responses.

Online internet HF LW MF web receiver based in Baden-Wuerttemberg cooperative state university Ravensburg Campus Friedrichshafen running a T2FD antennan under roof.

The Davie/Cooper City Amateur Radio Club (DCARC), established in 2010, is an amateur radio organization based in western Broward County, Florida.

Amateur Radio World Prefix Map, custom great circle maps and more. Map printing service based in the UK

Locura Digital is a Radio-Communication Professional company, dealer for wide range of amateur radio products, based in Barcelona Spain

The Homebase-10 is a wire halo antenna for 10m built with DIY store parts, effective despite its small size. Includes a dual-band version for 10m and 6m with gain around 0 to -2dBd, near omnidirectional pattern, and horizontal polarization. Overview based on a 2008 Practical Wireless article.

Amateur antenna and transceiver dealer based in Grosseto Italy

HamAlert let you receive Push,SMS,Email notifications for Cluster,RBN,SOTAwatch spots, with customizable filtering based on many criteria including DXCC, SOTA and WWFF references, CQ zones

Show CQ and ITU Zone in an interactive clickable map based on google maps. Additional locator tool tip can be displayed by clicking on points, and a search function it is also available to locate addresses, and locators.

Operating as a hub for its members, the Club Radioamateur Sorel-Tracy VE2CBS Inc. website provides essential information regarding club activities, membership management, and technical resources. It features articles on topics such as **D-STAR** digital voice mode training, offering a multi-capsule course for members to understand, configure, and effectively use D-STAR with ICOM equipment, including callsign routing and reflector connections. The site also details access to member cards, renewal processes, and upcoming events like the annual HAMFEST, which serves as a significant gathering for local radio amateurs. Beyond club-specific news, the site curates information on useful amateur radio tools and technologies, exemplified by articles on **HamClock** for propagation and satellite tracking, and a quick guide to Meshtastic for LoRa-based mesh networking. These resources aim to support members in exploring modern digital modes and enhancing their station operations, reflecting the club's commitment to fostering technical knowledge and community engagement within the Sorel-Tracy amateur radio scene.

W4RAT based in the Virginia capitol city of Richmond.

tabLog has been written to offer basic logging when /P and allows for easy import into your Shack-based log via ADIF. Best performance is with a tablet in landscape mode and using a small Bluetooth/micro-USB QWERTY keyboard – QSO entry via this method is simple, and efficient.

Based in Williamsport PA

How to convert the ICOM VHD base station IC-275D to 275H 100W 144-148Mhz

The QSL Managers Society is a platform where quality QSL managers come together to pool their resources and offer their services to DX and DXpeditions seeking a reliable QSL manager. Membership requirements include a commitment to the 'QSL Manager's Creed'. If you are a QSL manager or aspiring to become one, you can join the society by agreeing to the creed. The society is based in Tuckerton, NJ, USA, and aims to connect QSL managers with those in need of their services in the amateur radio community.

Based in Greece

Learn Morse Online in 40 lessons with this web based morse code learning program, based on the Koch method. Choose the lesson, adjust the wanted parameters, and start the transmission of a set of random characters based on chosen lesson. Recognize the code and verify it at the end of the lesson.

A homebrew radio transmitter project, based and inspired by the original 30 Watts input on 80 50 and 15 meters band transmitter by W11CP

Designs for QRSS TX and other Arduino based systems

Approximately 524,475 Brazilian amateur radio operators are cataloged within this resource, offering a comprehensive database for the South American region. Each entry includes geographical coordinates, enabling users to visualize station locations directly within Google Earth. This functionality supports DXers in identifying potential contacts and understanding propagation paths relative to specific Brazilian QTHs. The platform serves as a digital callbook, primarily focused on the Brazilian amateur radio community. It facilitates the lookup of callsigns and associated location data, which is crucial for award tracking, contest planning, and general operational awareness. The integration with mapping services provides a visual dimension to traditional callsign databases, enhancing the utility for operators interested in geographical aspects of radio communication.

Homemade RF limiter project, to protect the K3 receiver front-end for high radiofrequency based on the original KD9SV project.

Tropospheric Propagation Forecast for several areas. Base on a computed refractive index 4 times a day.

Sixty-meter repeaters typically use a 1 MHz frequency separation between input and output, while 2-meter repeaters commonly employ a **600 kHz** split and 70-centimeter repeaters use a **5 MHz** offset. This article details the fundamental technical principles of amateur voice repeaters, explaining how they extend VHF/UHF communication range by receiving on one frequency and simultaneously retransmitting on another. It covers essential components such as receivers, transmitters, filters, and antennas, often situated on elevated locations for optimal coverage. The resource delves into the critical challenge of _desensing_—where the repeater's strong transmit signal overpowers its own receiver—and the engineering solutions employed, including antenna separation and the use of high-Q cavity filters. It also explores various control and timing systems, from basic squelch activation to more sophisticated microcontroller-based boards that manage functions like voice identification, time-out timers, and fault protection. Different access methods are discussed, including open access, toneburst, CTCSS subtone, and DTMF, each offering distinct advantages for managing repeater usage and mitigating interference. Furthermore, the article examines repeater linking, both conventional RF methods and modern internet-based solutions, highlighting how linking expands coverage and promotes activity across multiple repeaters or bands. It introduces less common repeater types such as 'parrot' repeaters, which use a single frequency and digital voice recording, and linear translators, capable of relaying multiple signals and modes simultaneously across different bands, often found in amateur satellites.

Article based on ROHN engineering specification that will guide on proper guying heights and guy lengths when guying ham radio antenna masts. It will help you determine ahead of time the proper length of guy wires and the distance from the base of the mast to the anchor points

Dealer for Motorola to the full Kenwood, Icom, Entel, and Foretrack. Offer Based in East Sussex UK

Microprocessor based interface designed receives a signal from a Morse key, processes it, and re-transmits it to the radio. A microprocessor in the circuit is pre-programmed with a proprietary algorithm which makes a number of measurements and adjustments to the less percise human generated code.

Review of the Xiegu G90 20W HF portable transceiver capable to run CW SSB AMD modes, based on an Software Defined Radio

PropNET is an ad-hoc 2-way (and potentially, "more-way") RF-based digital communication network whose activity is reported on the Internet. As participating stations periodically ID and exchange data, they report their activity to an Internet data-collection hub for presentation through this web site.

Ham Radio Outlet South Africa based in Port Elizabeth

A homemade interface for any android device, allow to receive and trasmitt SSTV PSK RTTY from an android tablet based on the DD7LP original project include demo of a sample DIY kit.

UK based CB Radio, Ham Radio, PMR Radio web forum

Daki Funkversand is a German based web shop for Amateur- & CB-Radio equipment. Our shop includes products such as radios, antennas, equipment, PMR, LPD & Freenet.

The FCC ULS Amateur License Search allow to search for licences based on several criterias, including call, Operator Class, Types, Addresses, Status, and dates.

A loop antenna for 80 and 40 meters band, the main loop is based by a crossed line using aluminium strip lines. The main loop diameter is 150 cm.

A microprocessor based interface designed to go between a standard Morse code key and a radio transmitter. The circuit receives a signal from the key, processes it, and re-transmits it to the radio.

Product specialist for semiconductors and electron tubes based in Belgium

This is the blog for the M0BGR Amateur Radio Station. I am based in London, England but frequently go out mobile or portable.

Custom Designed Photo QSL Cards, Full Color stunning designs, High Quality Printing at competitive Prices. US based QSL designer and printer specialized in custom-designed ham QSL cards.

Electronic components distributor based in Gemany offer a variety of variable capacitors and other hard-to-find components.

This caution applies to all Icom HF transceivers. Based on a discussion with Matt Erickson, KK5DR

Iowa amateur radio club based in Boone

Designed for portable operation, it runs on 12v, and has an OCXO-based local oscillator.