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Monitoring extremely weak signals in the QRSS (Very Slow Morse) mode requires specialized receiving and processing capabilities to extract information below the typical noise floor. This project provides a software solution, _QrssPiG_, designed to run on a Raspberry Pi, enabling it to function as a dedicated QRSS grabber. It interfaces with various Software Defined Radio (SDR) devices, including the popular _rtl-sdr_ dongles and _HackRF_ units, to acquire raw I/Q data streams. The software then performs the necessary signal processing to visualize and decode these faint, long-duration CW transmissions, often operating with milliwatts of power. The system leverages the computational power of the Raspberry Pi for real-time signal analysis, allowing hams to participate in QRSS experiments and monitor distant beacons. It supports different SDR hardware, offering flexibility in setup and deployment for home stations or remote monitoring sites. The project includes detailed instructions for installation and configuration, making it accessible for those familiar with Linux environments. This grabber is particularly useful for tracking propagation on the LF and HF bands where QRSS activity is common, providing a visual representation of signal presence over extended periods.

The Kentucky Contest Group (KCG) website, maintained by N4GN, serves as a hub for amateur radio operators interested in **radiosport** contesting within Kentucky and southern Indiana. It details the group's dedication to promoting contesting, offers links to KCG officers, membership rosters, and upcoming meetings, and provides access to an active KCG e-mail reflector and Facebook Group for member communication. The site also features a comprehensive list of N4GN's recommended ham radio web picks, covering various categories like contesting resources, DXing, VHF/UHF/Microwave, and propagation information. The KCG's map center coordinates were updated on May 16, 2015, shifting approximately 16.5 miles SSW to 37° 21' N, 85° 39' W. Despite acknowledging current inactivity and an outdated web presence, the group remains operational, exploring options for reorganization, including a potential merger with the Tennessee Contest Group (TCG), which was ultimately rejected. The site emphasizes that membership applications are considered from anyone with a genuine interest in contesting.

While the Sunraysia Radio Group website is no longer actively maintained, it provides a glimpse into the amateur radio community in the Sunraysia, Mallee, and Tri-State areas of Australia. The site acknowledges that its content may be outdated, directing visitors to external links for current information. This resource acts primarily as a historical record, reflecting past activities and affiliations rather than a live, dynamic hub. It references various resources previously available to local hams, including web and social media pages, though these external links would need independent verification for current status. The site's primary value now lies in documenting the existence and focus of a regional amateur radio organization. Operators interested in the history of Australian amateur radio clubs or regional group structures might find the site's archived nature informative, despite the lack of contemporary updates.

A website for college and university amateur radio clubs to showcase themselves, work together, and promote amateur radio. Alumni and interested people can learn more about what college and university amateur radio clubs are doing.

This resource presents a placeholder page for the _Tobacco Valley Amateur Radio Club_ (TVARC), signaling the future establishment of an online presence for this amateur radio organization. The page currently displays a "Coming Soon" message, indicating that the club's official website is in development. It serves as a preliminary marker for the club's digital footprint, suggesting an upcoming platform for members and prospective hams. The current state of the page offers no technical details, operational information, or specific club activities. It functions solely as a temporary landing page, prompting site owners to log in for launch and visitors to check back later. The resource does not provide any data on club repeaters, meeting schedules, or special events, nor does it detail any past achievements like **DX contacts** or **contest scores**.

The K5BSA Venturing Crew 73 resource, intended for a ham radio club based in Richardson, Texas, currently presents a 404 "Page Cannot Be Found" error. This status indicates the original content, which likely detailed club activities, membership information, or amateur radio projects, is no longer accessible at the specified URL. The page provides general information about _QSL.net_ hosting services, noting it supports over 30,000 websites for amateur radio operators and organizations. The error message suggests contacting the website owner directly or using an internet search to locate the intended content. It also clarifies that QSL.net cannot assist in finding specific missing pages hosted by individual users, as each site is independently maintained. The platform offers its email and web services without cost to the amateur radio community. Despite the error, the page includes links to general QSL.net resources such as "About QSL.net," "The Help Page," and "EMail Mailing Lists." It also features a prominent "Make a Donation" option, emphasizing that while services are free, user contributions are encouraged to support the hosting infrastructure.

The EA8ALP personal page, hosted on QSL.net, is currently inaccessible, presenting a 404 "Page Cannot Be Found" error. This resource was intended to feature Adelto, an amateur radio operator from the Canary Islands, likely detailing his station, operating activities, or other personal ham radio interests. The QSL.net platform, which hosts over 30,000 amateur radio websites, provides free web and email services to operators and organizations, relying on donations for support. While the specific content of EA8ALP's page is unavailable, the platform's structure suggests it would typically include information relevant to **DXing** and **contesting**, common interests for operators in geographically desirable locations like the Canary Islands. Users encountering this error are advised to contact the website owner directly or use an internet search to locate the intended content, as QSL.net cannot assist with individual site content issues.

The resource, "Conventional Use of Transmission Line," meticulously details the operational principles of transmission lines, emphasizing the Transverse Electromagnetic (TEM) mode of energy transfer. It clarifies that for a line to function purely as a transmission line, all currents must be confined internally, with external fields ideally zero. The discussion differentiates between balanced and unbalanced lines, asserting that while both require equal and opposite currents within the conductors, the key distinction lies in the voltage relationship of each conductor to the surrounding environment. It highlights that a good antenna pattern does not inherently confirm proper feeder balance, and that common-mode currents can lead to RF in the shack and increased noise levels, even without pattern distortion. The article further explains that a transmission line can become a radiating conductor if energy is applied in a non-TEM mode, leading to common-mode issues. It cites classic texts like Jordan and Balmain's "_Electromagnetic Waves and Radiating Systems_" and Kraus's "_Antennas_" to support its definitions of TEM mode operation. The content also explores non-transmission line applications of parallel or concentric conductors, such as _coaxial dipoles_ and _folded dipoles_, which intentionally operate in non-TEM modes for antenna functionality. The author, _W8JI_, stresses that simply measuring equal currents is insufficient to confirm a balanced feeder; phase and voltage balance to ground are equally critical.

The original intent of this resource was to serve as the online presence for the Heart of Texas Ham Operators Group, identified by the callsign **WA5HOT**. This amateur radio club, based in Texas, would typically engage in local ham radio activities, potentially including field days, emergency communications support, and fostering camaraderie among its members. Such organizations often provide a platform for hams to share technical knowledge, organize **QSO parties**, and participate in community service events, contributing to the growth and public image of amateur radio. However, the current content of the page has completely diverged from its original purpose. It now features multiple articles in Indonesian discussing online gambling platforms like "Kawan Slot" and "Kuda Togel." These articles detail strategies for winning, managing finances in online gaming, and the features of these platforms, including AI recommendations, diverse game themes, and bonus programs. The shift in content indicates a complete repurposing of the domain, moving from a ham radio club site to a gambling-related information portal.

Explores the re-establishment of SDRGadgets as an online shop, focusing on accessories for Software Defined Radio enthusiasts. The proprietor details the process of rebuilding the website and restocking products after a hiatus, emphasizing a commitment to affordability and user experience in the SDR hobby. The site aims to offer items that enhance SDR operation, such as VFO controllers, without significant financial outlay. Anticipates a refreshed product line featuring a "sleeker and more technical look and feel," leveraging new manufacturing technologies. The owner expresses enthusiasm for showcasing these redesigned items and expanding the inventory beyond initial offerings, inviting customer suggestions to tailor product development. Welcomes both returning customers and new visitors, acknowledging the current limited product availability during the rebuilding phase. The site promises worldwide postage and encourages interaction for product ideas, aiming to foster a community around practical, budget-friendly SDR solutions.

Voldatech, a manufacturer based in China, produces a range of RF feeder cables and site components essential for amateur radio installations and telecommunication infrastructure. Their product line includes various types of coaxial cables, such as **50 Ohm** and 75 Ohm options, along with a comprehensive selection of connectors like N-type, UHF, and BNC. These components are critical for maintaining signal integrity and minimizing loss in antenna systems, whether for a home shack or a remote DXpedition setup. The company's focus on _RF Coax cables_ and connectors directly supports the needs of radio amateurs seeking reliable transmission lines for their transceivers and antennas. Amateurs often compare Voldatech's offerings to established brands, evaluating factors such as impedance matching, shielding effectiveness, and durability under various environmental conditions. The availability of diverse cable types allows operators to select optimal solutions for different frequency bands and power levels, from QRP to high-power amplifier setups. Their products are particularly relevant for those constructing new antenna arrays or upgrading existing feedline systems, aiming to achieve maximum power transfer and reduce standing wave ratio (SWR) for efficient signal propagation.

Operating in a Single Operator Two Radios (SO2R) setup, especially with beverage antennas, often exposes the receiving radio's front-end to significant RF energy from the transmitting radio. This resource details a practical, homebrew receiver protection circuit designed to mitigate this risk. The core of the design involves a non-inductive 2W 22 Ohm carbon composition resistor in series with the RX antenna line, followed by two stacks of four fast-switching diodes (e.g., _1N914_) configured in opposite polarizations. This arrangement effectively clamps the incoming voltage to approximately 2.8 V peak-to-peak, safeguarding sensitive receiver input components. The series resistor plays a crucial role by absorbing excess power, preventing the diodes from exceeding their current ratings and potentially failing open, which would leave the receiver unprotected. The author, _N4KG_, measured up to 50 watts of coupled power between 80M slopers on the same tower, highlighting the necessity of such protection. The design is presented as a cost-effective solution to prevent damage to receiver input transformers, with the author noting successful protection of a receiver even after a resistor showed signs of overheating. This simple circuit can be integrated via a transverter plug, offering a robust defense against high RF input.

Covers the WB2JKJ Educom HF Net, which operates on 7.238 MHz and 21.395 MHz. This resource highlights the activities of The Radio Club of Junior High School 22 NYC, Inc., a non-profit organization established in 1980. The club's mission, "Education Thru Communication" (EDUCOM), focuses on integrating amateur radio into schools across the nation as a teaching theme. WB2JKJ, Joe Fairclough, founded and presides over this club, which is recognized as NYC's largest ham radio club. The site also provides access to the "APPLE SLICE NewsletterCurrent Edition" and information on how to support the organization. It includes a scrapbook section and contact details for further engagement. The content was last updated on May 5, 2023, reflecting recent activity.

Illustrates the fundamental principles of radio repeaters, detailing their role in extending communication range beyond line-of-sight limitations. It begins by defining _simplex communication_ as a direct radio-to-radio link, effective only when no obstructions impede the signal path. The resource then introduces the concept of a repeater (or base station) strategically positioned on elevated terrain, such as a mountain, to overcome geographical barriers. The article clarifies the repeater's operational mechanism: it receives a signal on one frequency and simultaneously re-transmits it on a different frequency, enabling users on opposite sides of an obstruction to communicate. This _duplex operation_ is likened to satellite communication for VHF propagation, but with a fixed terrestrial station. Specific examples of signal paths are provided, showing how a handheld radio transmits up to the repeater, which then relays the message down to another user, effectively bypassing obstacles like hills or large buildings.

Website dedicated to the Robust Packet Network with dynamic map of current stations, RP documentation, List of capable modems

Details the operational scope and maintenance requirements for the Gloucestershire Repeater Group's amateur radio repeater network. It outlines the financial obligations associated with site rent, electricity, insurance, and professional aerial maintenance, emphasizing the necessity of member support or donations for sustained operation. The resource provides information on accessing individual repeater systems via the site menu. It also announces the 2026 Annual General Meeting (AGM) details, including the date, time, and location at The Robins Nest, Cheltenham Town Football Club, noting the venue is shared with the Cheltenham Amateur Radio Association. The page highlights the availability of the repeaters to all licensed radio amateurs and details how to contribute to their upkeep through membership or direct donations.

Over 15 years of continuous operation, Ham365 provides a web-based logging solution for Amateur Radio Operators, allowing them to maintain and share their QSO records online. Originally launched as the online logbook component of Ham Radio Deluxe, it has since evolved into an independent platform, now integrating with numerous other logging applications. The platform shares its database with HRDLOG.net, ensuring that operations performed on one site are reflected on the other, maintaining data consistency for users. Key features include an overview of the latest hour's activity, a display of the most recent QSOs, and a map visualizing recent contacts. It also highlights "Most Wanted" entities and ongoing DXpeditions, providing a dynamic view of current amateur radio activity. The logbook supports various operating modes, including SSB, RTTY, PSK31, and FT8, and handles ADIF data for interoperability. Users can manage their logbooks, track DX activity, and utilize features like OQRS (Online QSL Request System) through its integrated functionalities. The system is designed to be accessible to a wide range of operators, from casual ragchewers to avid DXers and contesters.

Modeling an antenna over real terrain gives you a visual picture of how terrain impacts performance. You can use a model to determine optimum height for antennas on an existing tower, Compare different tower locations for performance, Compare different sites for performance

The Peilgruppe Neandertal, featured on Peilsport.de, actively promotes _Amateur Radio Direction Finding_ (ARDF), also known as fox hunting. This German group combines radio technology with outdoor sport, participating in regional and national ARDF events. Members access current ARDF schedules, competition results, and downloadable certificates directly from the site. The content highlights the adventurous spirit of ARDF, emphasizing the blend of technical skill and nature exploration. DL7ET and DR9P are noted callsigns associated with the group, indicating active participation from experienced operators. The site also covers related activities like Foxoring, a variation of ARDF that integrates orienteering with radio direction finding. This resource serves as a central hub for the Neandertal group's activities, documenting their involvement in a sport that challenges both physical endurance and radio proficiency.

Sierra Radio Systems site controllers are used to monitor and control remote radio and equipment sites, often implemented to monitor repeater systems, broadcast equipment, solar power infrastructure, tracking rf power, temperature, voltage, current and switch closure

This page by Keith Greiner describes a magnetic loop antenna project, providing step-by-step instructions to create two versions of a system with one large loop and one small loop. It includes details on how to construct the loops using different materials, along with the necessary equipment like antenna analyzers, tuners, and software. The page is divided into five sections covering project discussion, design summary, an improved small loop, construction steps, and radiation pattern analysis. Aimed at hams interested in building their own magnetic loop antennas, the page offers practical guidance and insights into impedance matching for improved performance.

Eaton provides a comprehensive suite of power quality solutions, ranging from compact single-phase isolation units to high-capacity megawatt sag correction systems. The resource details Eaton's engineering expertise in addressing diverse power quality challenges, emphasizing the distinction between DC resistance and apparent AC resistance under heavy current loads within AC power distribution systems. Specific **Marine-Grade surge protective solutions (SPD)** are highlighted, designed to safeguard critical safety and navigation equipment on vessels and rigs against unpredictable power transients in harsh environmental conditions. The company's commitment extends to providing appropriate solutions for critical power systems, ensuring quality installation. The site also features customer testimonials from entities like Federal Express, Kutztown University, J. C. Penney, and Fairchild Aircraft, attesting to the effectiveness of products such as 'The Protector' in preventing equipment damage and downtime.

An online database featuring current and historical weather balloons, complete with a fully searchable archive that can be filtered by launch site. The integrated map shows both the current and historical trajectories of radiosondes, from their launch points to their final landing positions.

A Magnetic Loop Controller project details the construction and operation of an automatic tuning system for magnetic loop antennas, which are resonant circuits using an oversized inductor and an adjustable capacitor. The system employs a stepper motor to precisely adjust the variable capacitor, maintaining optimal resonance across the HF bands. It integrates with various transceivers, including _Icom_, _Kenwood_, and _Yaesu_ models, by monitoring the VFO frequency and adjusting the loop's tuning accordingly. The project provides comprehensive building instructions, a PowerPoint-style presentation, and the full source code for the controller's firmware, enabling hams to replicate and customize the design. The controller's firmware offers diverse functionality, including automatic frequency tracking, manual tuning, and SWR monitoring, significantly enhancing the operational efficiency of magnetic loop antennas, particularly for QRP and portable operations. The design emphasizes accurate capacitor positioning, crucial for achieving low SWR and maximum radiated power. Comparisons with manual tuning methods highlight the benefits of real-time adjustment, especially when operating across different bands or making frequent QSYs. The project's detailed documentation and available source code facilitate experimentation and modification by advanced builders, allowing for tailored performance characteristics.

The resource details active HF radio networks maintained by foreign ministries for diplomatic communications, specifically listing operational schedules and frequencies. It currently covers networks for Bulgaria, Czechia, Egypt, North Korea, Russia, Tunisia, and the United States. The content provides specific operational parameters for these government-run shortwave stations. Information includes details on _legacy modes_ of operation and specific transmission times. The site also includes schedules for various _number stations_ which often utilize similar HF spectrum allocations. The data presented aids in identifying and monitoring these unique, non-amateur radio signals across the shortwave bands. Specific sections are dedicated to the networks of North Korea and the United States, offering granular data for each.

The Ukrainian Contest Club (UCC) website details contest activities, including a March 2026 contest calendar compiled by _UW3WF_ that excludes specific "exotic" tests, mini-tests, sprints, VHF competitions, and events organized by Russian entities. It lists major contests such as the ARRL International DX Contest, Stew Perry Topband Contest, and CQ WPX SSB Contest, providing dates, times, modes, bands (e.g., **10-160m**), organizers, log submission methods, and deadlines. The resource also highlights Ukrainian participation in various international contests, noting specific callsigns that represented the UCC, and acknowledges new Ukrainian records, such as UW5Y's new record in the ARRL DX CW Contest. The site presents contest results and rankings, including the top 20 Ukrainian contesters in the World Amateur Radio Contesting Association (WARCA) rating for 2019-2024, with _UW1M_ ranked #18 globally and #1 in Ukraine with **26,490.32** points. It also details the club's 12th place finish among 155 clubs worldwide in the CQ WPX Contest 2024 (CW + SSB). The resource includes information on WRTC 2026 participants from the club and lists members excluded due to collaboration with adversarial entities, reflecting the current geopolitical context.

This page provides updated data and statistics about United States amateur radio operators, including historical totals, demographics, and geographic distributions. It also explains the Amateur Radio Service, highlighting its role in promoting wireless communication and technological advancements. The page is a valuable resource for hams interested in understanding the current landscape of amateur radio in the United States.

This Website is here to enhance the Amateur Radio experience and for those who are interested in multiple areas of our great hobby. We have information about Amateur Radio Emergency Communications. There are many areas in our great hobby that serve different capacities, ARES, RACES, NTS, FEMA, Linux, and much more.

This page discusses the purchase of a fiberglass push-up mast for portable operations in the ham radio hobby. The author shares their experience with the MaxGain Systems MK-4-HD mast, highlighting its versatility for both home and on-the-go setups. They also detail modifications made to the mast base and provide insights on tube sizes for different antenna types. The content is useful for hams looking to improve their portable station setup and optimize antenna performance in various environments.

Solar Wind Velocity and Auroral Storm Potential the website provides also current magnetic indices like last Kp values and predicted Kp values.

Website dedicated to weekly space weather forecast and updates on current solar activity. Dr Skov provides video forecasts and weekly audio forecasts

Learn how to easily convert between different units like dBu, dBm, W, mW, V, and uV with the dBCalc application. This small windows program allows ham radio operators to quickly check conversions using input and output resistance. It's a useful tool for anyone dealing with electronic measurements and calculations. Best of all, dBCalc is free to use, making it a convenient solution for amateur radio enthusiasts. This tool simplifies complex conversions and helps hams optimize their equipment setup.

AutoEZ, Automated use of EZNEC, is an Excel workbook that works alongside EZNEC antenna modeling software version 5.0 or later. With AutoEZ, you can control different aspects of your model using variables and run multiple EZNEC test cases automatically. Formulas in Excel allow you to modify any part of the model. AutoEZ's interface resembles EZNEC's. Enabling macros in Excel might be necessary before using AutoEZ. The program opens various model file formats including EZNEC (.ez), NEC (.nec or .inp), AO and NEC/Wires (.ant), and MMANA-GAL (.maa). You can set the frequency and/or variable values for the test cases to be run through EZNEC. AutoEZ allows you to create animations showcasing how the pattern changes as the model configuration is modified. You can download a fully working, but limited demo copy from this site.

The page provides a collection of modifications and upgrades for the Kenwood TS440 transceiver. Hams looking to enhance the performance or features of their Kenwood TS440 will find valuable information and instructions here. The site offers a range of mods for various amateur radio equipment, catering to a global audience of radio enthusiasts. Visitors can easily navigate to other related pages on modifications for different radio models, as well as general information on CB and ham radios.

AA9PW offers free practice exams for all three US license classes plus international licenses like Canadian and Australian. The site generates random tests from the current question pools, simulating the actual exam experience. You can choose between online exams or printable PDF versions for offline study. The site maintains a simple, no-frills interface that loads quickly even on slow connections. Practice tests provide immediate feedback with score reports highlighting areas needing improvement.

_Icom_, _Yaesu_, and _MFJ_ are among the renowned brands available at R&L Electronics, a dedicated store for amateur radio enthusiasts. The store provides a diverse selection of equipment, catering to both novice and seasoned operators. From amplifiers and preamps to antennas and tuners, the store ensures a comprehensive inventory to meet various operational needs. Customers can also find essential components like cables, coax, and connectors, crucial for setting up and maintaining effective radio stations. In addition to new equipment, R&L Electronics offers used items, providing budget-friendly options without compromising on quality. The store's inventory includes test equipment and tools, vital for troubleshooting and optimizing radio performance. Tower components are also available, supporting those involved in more advanced setups. The website facilitates easy access to product information, shipping details, and order tracking, enhancing the shopping experience. R&L Electronics stands out by offering a variety of products that cater to different preferences and budgets, ensuring that every amateur radio operator can find the necessary equipment to enhance their setup.

Ham Exam provides adaptive practice tests that adjust difficulty based on your performance. The site offers all current question pools and calculates your probability of passing the actual exam based on your practice results. It includes detailed explanations for each answer and tracks your progress across specific subelements of the exam. The clean, distraction-free interface makes it easy to focus on studying, and no registration is required to use the basic features.

Use the official POTA spotting website to search for active parks. This is the official spotting website for POTA. You can see current activations. On the Activations page, you can see the registered activations.

Gordon West Radio School provides comprehensive study materials including books, audio courses, and practice exams. "Gordo" is renowned for his ability to explain complex concepts in memorable ways, often using humor and mnemonics. His materials include insider tips from his decades of teaching experience and administering exams. The audio courses are especially popular among commuters who can study while driving. The site offers package deals combining different media formats for various learning styles.