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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.

This PDF document provides detailed information on small loop antennas for hams. It covers the design, construction, and usage of small loop antennas for amateur radio operators. The guide includes practical tips and recommendations for optimizing the performance of small loop antennas in various operating conditions. Whether you are a beginner or an experienced ham radio operator looking to improve your antenna setup, this guide has valuable insights to offer.

This innovative antenna tuning unit (ATU) enables QRP operators to match their antennas without transmitting RF signals. Using a noise bridge technique instead of traditional transmit-and-tune methods, it achieves truly silent operation. The design incorporates an L-match network with switched inductors and variable capacitor, handling impedance matching from 3-30MHz. Operating from a 9V battery, it includes a built-in RF power meter and dummy load for QRP transmitter testing. The compact unit is particularly suitable for portable operations where minimal RF emissions during tuning are desired.

QRP is a Q-code originally meaning reduce power, but now has come to mean operating a radio that outputs 5 watts or less for CW or 10 watts for SSB.

AZIWORLD is a user-friendly tool for generating azimuthal maps of the Earth centered on any location. Compatible with Windows XP and later, it supports English and French. Maps can be saved in .bmp format for easy customization. AZIWORLD computes azimuths, distances, and geographical positions, integrating seamlessly with AZIPOINT for automatic antenna pointing. Linux/Ubuntu/Android users can run AZIWORLD via WINE or CROSSOVER. For optimal functionality, installing AZIPOINT alongside AZIWORLD is recommended.

Being frequently away from home, the author owner of an Elecraft KX3 missed the opportunity to work /M. They devised a portable antenna solution, incorporating a coil and car body, enabling multi-band tuning. Despite its unconventional design, the antenna exhibits promising performance, resembling a vertical dipole.

The Code Practice Oscillator kit, featured at TechFest 2020, provides a straightforward device for Morse Code skill development. It utilizes two 3V coin batteries for power and is designed for ease of construction, making it accessible for hams of various ages. The kit's primary technical substance revolves around generating an audible tone for practicing Morse Code timing and ear training, with a downloadable schematic detailing its electronic configuration. Construction of the oscillator involves soldering, with adult supervision recommended for younger builders. The kit's practical application lies in offering a hands-on method for beginners to learn Morse Code and for experienced operators to refine their sending abilities. Instructions for assembly are available as a downloadable PDF, complementing the schematic to guide users through the building process.

TNXQSO.com offers a streamlined **log search** utility, specifically designed to consolidate QSL information for **DXpeditions** and special event stations. This online service aggregates data from prominent logging platforms such as Club Log, Logbook of The World (LoTW), and HRDLog, presenting a unified interface for radio amateurs to verify their contacts. The platform aims to simplify the process of confirming QSOs by providing direct links to the respective logging services, allowing users to quickly ascertain if their contact has been uploaded and confirmed. Users can input a callsign and band to retrieve immediate results, indicating whether a QSO is present in the linked logs. The service also supports DXpedition teams by offering tools for managing their own logs and QSL routes, without requiring an account for general log searching. This functionality proves particularly useful for DXers seeking rapid confirmation of rare contacts or for those managing their QSLing efforts across multiple platforms after a significant operating event.

DX University publishes an operating guide for DXPeditions with 13 hints and tips on managing pileup

Constructing an effective antenna support system often involves safely elevating wire antennas into trees or over obstacles. This resource details the build process for the WT8WV "Colossus" air cannon antenna launcher, a pneumatic device designed to project a pilot line over elevated structures. It specifies the use of readily available PVC pipe components and standard hardware, outlining the exact materials required and providing step-by-step assembly instructions for a robust, low-cost solution. The article presents a practical alternative to traditional methods like slingshots, emphasizing the launcher's utility for Field Day operations and general antenna deployment. It includes a comprehensive list of parts, such as 2-inch and 1-inch PVC pipe, various fittings, a sprinkler valve, and a bicycle pump valve, detailing their integration into the final assembly. The total cost for materials is estimated at around $40 per unit, making it an accessible project for many radio amateurs. Crucially, the guide incorporates essential safety precautions for operating a pneumatic launcher, covering aspects like pressure management and projectile selection. It also features multiple photographs illustrating the construction phases and the completed device, offering visual clarity to aid builders in replicating the design.

TNXLOG is a specialized logging application designed to complement the TNXQSO.com online service, focusing on real-time data exchange rather than serving as a standalone general-purpose logbook. The software facilitates the transmission of current **QSOs** to the TNXQSO.com server and simultaneously retrieves relevant geographical data such as RDA, Locator, and RAFA from the same server. It maintains real-time QSO statistics, providing operators with immediate feedback on their activity. Additionally, the application supports working with **CW macros** via a COM port, streamlining Morse code operations during contacts. This utility is specifically tailored for users of the TNXQSO.com service, enhancing their operational experience by automating data synchronization and providing instant access to location-specific information. Its design prioritizes integration with the online platform, making it a companion tool for those engaged in specific award programs or regional operating activities that benefit from real-time data exchange and statistics. The software's functionality is distinct from traditional logbook programs, emphasizing its role in a connected operating environment.

SWR Magazine is free montlhy ham radio online magazine published in English and Spanish. SWR Magazine presents a mix of analysis, hands-on experience, and technical insight for ham radio operators. Covering global radio trends, technical topics like antenna takeoff angle, operating practices outside the shack, reviews of radios, propagation. Explore innovative antennas, digital modes like RTTY, and historical radio origins. This issue bridges the past, present, and future of amateur radio, inviting readers to not just read, but experience and experiment with the content.

The WSSM Emergency Communications Team serves the Cumberland County Emergency Management Agency (CCEMA), and the community in general, by providing emergency communications assistance, conducting programs and training, promoting radio knowledge, fraternalism, and individual operating efficiency, and to conduct activities as to advance the general interest and welfare of Amateur Radio as a viable and efficient means of communications support.

Optimizing a QRZ.com page involves adding essential callsign data, ensuring correct _Maidenhead Gridsquare_ and DXCC information in the Detail tab, and populating the Biography section with relevant station details. Operators should include their operating conditions, specific country references like WAB square, club affiliations, and detailed QSL information, specifying preferences for electronic confirmations (e.g., _LoTW_, Clublog) and paper QSLs (direct, bureau, SASE). The guide emphasizes the importance of accurate data for electronic logging software integration, which fetches Gridsquare, DXCC, and CQ/ITU zones to populate contact logs correctly. Further enhancements include leveraging the QRZ.com photo gallery for images and setting a primary image that logging software like _Log4OM_ can display. Advanced customization involves embedding external services via HTML source code. Examples include integrating HamAlert for DX Cluster spots, Clublog for log searches and Online QSL Requesting (OQRS), and Parks on the Air (POTA) statistics widgets from WD4DAN. Additionally, live weather information from Weather&Radar and solar data banners from HamQSL can be embedded, providing real-time environmental context for visitors to the QRZ page. These embedded tools require creating accounts on respective platforms and often involve copying specific source code snippets into the QRZ biography's HTML editor, ensuring callsign placeholders are updated.

Learn about the LinHT handheld SDR radio, an open-source, Linux-based project that is shaking up the ham radio and SDR communities. This guide is perfect for hams new to digital voice and interested in exploring experimental radio platforms. Discover what sets LinHT apart from traditional handheld radios, how it leverages SDR technology and Linux operating system, and why it's generating buzz in the ham radio landscape. Dive into the world of software-defined handheld radios with this beginner-friendly overview.

Presents a detailed construction guide for a 9 dB, 70cm collinear antenna, utilizing readily available _RG58/U_ coaxial cable and PVC pipe for housing. The resource outlines the critical calculations for ½ wavelength sections at 444 MHz, incorporating the coaxial cable's velocity factor of 0.66, which yields a section length of 223 millimeters. It specifies the preparation and soldering of eight such half-wavelength sections, each cut to 231mm to allow for trimming, forming the core of the array. Further instructions detail the integration of a ¼ wave element (169mm #16 solid wire) at the top and a ¼ wave aluminum tube (160mm, 5/16 inch) at the bottom, crimped to the feed point's braid. The guide also addresses RF common mode current suppression by suggesting the use of _FT50-43_ toroids on the feedline. Final assembly steps cover mounting the antenna within ¾" PVC pipe using a wooden dowel, waterproofing connections, and initial SWR checks. The article also discusses scaling the design for different element counts and other VHF/UHF bands.

This PDF document provides detailed information on the design, construction, and tuning of trapped vertical antennas with radials for ham radio operators. It covers the theory behind trapped antennas, practical considerations for installation, and tips for optimizing performance. Whether you are a beginner looking to build your first HF antenna or an experienced operator seeking to improve your station setup, this guide offers valuable insights and instructions. By understanding the principles outlined in this document, hams can enhance their operating experience and make the most of their radio communication capabilities.

To use the RF Exposure Calculator, fill-in the form with your operating power, antenna gain, and the operating frequency. Depending on how far above ground the RF source is located, you might want to consider ground reflections too.

Antennas for low-power operation resemble those for 100W use. Minor adjustments, like capacitor voltage ratings, may apply, but basic principles persist. Portable antennas, notably Backpack Antennas for weight-conscious setups, hold relevance beyond QRP. While some antennas function acceptably at higher power, efficiency issues arise at QRP levels. Testing antennas at 100W exposes weaknesses, particularly in tuners, crucial for efficient QRP operation.

For amateur radio operators engaging in portable operations like SOTA or POTA, rapid deployment of an effective antenna system is paramount. This video resource details the assembly process for the Buddipole multiband dipole antenna, showcasing its components and how they fit together. Rob, VK5SW, systematically presents the mast, coil arms, radiating elements, and the VersaTee hub, emphasizing the modular design that allows for quick configuration changes across various HF bands. The demonstration highlights the antenna's adaptability for different operating environments, from a ground-mounted vertical to a horizontal dipole. The video illustrates the ease with which the antenna can be packed and deployed, making it a practical choice for activations where setup time is limited. The Buddipole's design facilitates efficient band changes and tuning, crucial for maximizing QSO opportunities during field operations.

The NorthEast Wisconsin DX Association (NEWDXA) was established in December 1993 by twenty-one amateurs from the region who shared an interest in DX'ing and Contesting. Those individuals came together because of this interest and the additional interests in communicating with others, maintaining high operating and technical standards, and their passion for DX'ing.

Program for do application and endorsement for all ARRL awards-30 awards-18 for DXCC -12 for others and 8 special querry (how long I'm waiting for QSL. You can merge several awards and endorsement in a one application and upload adif file to ARRL page by ON-LINE method. Offering optimization task for cost checking QSO.Cooperating CLUBLOG

A website dedicated to RTTY with several articles and information on teletypes from history to operating RTTY on ham bands

HRAL ATNi KN Explained in 7 Languages, PDF files of the operating protocol for IOTA activations.

The QRP Cluster provides a dedicated platform for _QRP_ (low power) amateur radio operators to self-spot their on-air activity. This web-based service allows users to post real-time information about their current operating frequency, modulation mode, equipment used, and transmit power. It facilitates QRP-to-QRP contacts and helps other low-power stations locate active QRP signals across various bands. Unlike general DX clusters, the QRP Cluster focuses exclusively on low-power operations, fostering a community for QRP enthusiasts. It enables operators to share details such as **5 watts** or less output, often specifying antenna types or unique portable setups. The platform supports the discovery of QRP stations for casual QSOs, contests, and award hunting, enhancing visibility for stations that might otherwise be overlooked on higher-power clusters.

DecoAlert 1.0 Beta is a companion application designed to enhance the digital mode operating experience, specifically for FT8, FT4, and FT2. It operates by monitoring UDP data streams from primary decoding software like _Decodium_ and _WSJT-X_ on port 2237. The software provides real-time, priority-based audio alerts using WAV sounds for various conditions, including All Time New Ones (ATNO), new DXCC entities per band/mode, user-defined watchlist callsigns, new Maidenhead grid squares, and LoTW-active stations. It also highlights previously worked stations (B4) and integrates live DX spots from Telnet clusters, offering a comprehensive suite of tools for serious digital mode operators. The application features a built-in SQLite database for tracking worked stations and integrates with LoTW user lists to identify confirmed contacts. A DX Cluster client supports multiple Telnet servers, providing a broad view of propagation. PSKReporter statistics are available by band and mode, offering insights into signal paths. The QSO log viewer includes search and filter capabilities, while an _OpenStreetMap_ (OSM) interface visualizes spot locations, aiding in situational awareness. DecoAlert requires Windows 10/11 (64-bit) and compatible digital mode software configured to send UDP data.

This page provides detailed information on the 4DX directional wire beam antenna designed by LZ1AQ, LZ1ABC, VK6LW, and DD5LP. It explains how to create this antenna for single or multiple bands using four separate sloping wires. The page includes instructions on achieving directionality, gains, and F/B ratios, as well as generating radiation patterns, VSWR charts, antenna currents diagrams, and Smith charts. It is a valuable resource for hams interested in building and optimizing their own directional wire beam antennas for improved performance and long-distance contacts.

Presents a dynamic platform for real-time amateur radio contest scoring, enabling participants and enthusiasts to monitor ongoing competition results. The system processes submitted contest data, displaying live scores and competitor standings as they update. Users can observe the progress of various contests, gaining immediate insight into the competitive landscape. This resource serves as a central hub for following _DX contests_ and other operating events, offering a transparent view of current standings. It facilitates an engaging experience by providing up-to-the-minute score updates, reflecting the intensity of _on-line contesting_ and the efforts of operators globally. The platform's utility extends to both active participants submitting scores and observers interested in the competitive dynamics. It aggregates data from multiple sources, presenting a consolidated view of contest activity. The system's design emphasizes rapid data processing and clear presentation of results, crucial for high-stakes events like the _CQ World Wide DX Contest_.

Operating the FT-817 from various types of batteries, such as Alkaline Cells, NiCd or NiMH rechargeable batteries. An useful article that compares usage of different types of batteries for the Yaesu FT-817

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.

The Portable EFHW antenna for the 40, 20, 15, and 10-meter bands utilizes a broadband transformer with a 1:49 ratio, designed on a PCB by either Jan or DL2MAN. The design incorporates an **FT114 core**, offering an alternative to the FT82 core. The antenna requires precisely 20.5 meters of DX Wire Ultralight for optimal performance. Additional components include DX Wires "Dyneema" 1mm rope and 1mm bricklayers string for structural support. The SWR plot indicates performance at two elevation heights: 5.5 meters (blue line) and 4 meters (yellow line), demonstrating optimization for low-elevation portable use without poles. The antenna's components, including spool and rope tensioners, are available for 3D printing, with spool dimensions scaled to 130% for a length of approximately 110mm. The design emphasizes simplicity and portability, suitable for field deployment.

Four _Headway 38120_ LiFePO4 cells form the core of an 8AH 12V battery pack, designed for reliable emergency and field power in amateur radio operations. These batteries offer significant advantages over traditional lead-acid types, including a lifespan up to **10x** longer in charge/discharge cycles, lower internal resistance for faster recharging, and a flatter discharge curve that maintains voltage stability during use. Their inherent safety, being a flame-retardant technology, makes them a preferred choice for portable applications. Proper configuration, including parallel/serial setups, and careful charging/discharging protocols are crucial for maximizing battery life. Each cell has a nominal voltage of 3.2 volts, with a maximum charge voltage of 3.65 volts. A Battery Management System (BMS) is highly recommended to prevent overcharging or deep discharging, safeguarding the cells. The project emphasizes safety, noting the batteries' high short-circuit capacity of **200 AMPS** and the critical importance of incorporating an inline fuse between the battery pack and the load. Components like the battery holder, buss bars, and a suitable case are also detailed.

The XX9D Log Online provides a direct log search function for the DXpedition to Macao, specifically detailing operations conducted in 2017 and 2019. This service allows amateur radio operators to verify their contacts (QSOs) with XX9D, a critical step for QSL card management and award applications. Users are explicitly advised to consult the online log to prevent duplicate contacts on the same band and mode, optimizing efficiency during active DXpedition periods. This online tool supports the "DX Code Of Conduct," promoting ethical operating practices within the amateur radio community. The platform facilitates the Online QSL Request System (OQRS), streamlining the process for requesting QSL cards without the need for traditional bureau or direct mail methods. Operators are instructed to defer OQRS submissions until the conclusion of the DXpedition, ensuring all logs are finalized. The log search interface is powered by CMSimple, a content management system, indicating a straightforward, database-free web application. The resource is designed for ease of access, providing a clear method for DXers to confirm their contacts and manage QSL requests efficiently.

Putting one of those old modems back into use.AMTOR is an acronym for AMateur Teleprinting Over Radio and was mostly used on HF. The mode is based on the marine SITOR code that was introduced to amateur radio by Peter, G3PLX. The mode is an enhancement of RTTY with active error correction that copes reasonably well with interference and fading.

The Shrunken Quad antenna is a unique design that offers full-sized performance on the 10m and 15m bands while incorporating linear loading via a trap for operation on the 20m band. This design allows for effective communication in the HF spectrum, making it suitable for both casual operators and serious DXers. The quad configuration provides excellent gain and directivity, which is beneficial for contesting and long-distance contacts. Constructing the Shrunken Quad involves careful attention to dimensions and materials to ensure optimal performance. The antenna's compact nature makes it an excellent choice for limited space situations, allowing operators to enjoy the benefits of a quad without the need for extensive real estate. This project is ideal for amateur radio enthusiasts looking to enhance their station's capabilities with a versatile and efficient antenna system.

Robust PACKET, developed by Spezielle Communications Systeme GmbH & Co. KG (SCS), is an OFDM variant of the amateur PACKET mode specifically engineered for HF operation. This mode utilizes a 500 Hz bandwidth with 60 Hz carrier spacing, employing OFDM with 8 DBPSK or DQPSK carriers. It supports 200 bps using BPSK and 600 bps with DQPSK, with each subcarrier operating at a constant rate of 50 Bd. Robust PACKET leverages the AX-25 frame protocol for data transmission, similar to standard PACKET. Compared to traditional PACKET, Robust PACKET demonstrates enhanced resilience against multipath propagation and fading effects, critical for reliable HF communications. It also exhibits a more efficient spectral footprint, with sidebands extending only to 500 Hz, whereas 300 Bd FSK PACKET can produce sidebands up to 730 Hz. Operational frequencies for Robust PACKET include 3.61 MHz, 7.0473 MHz, 10.1473 MHz, and 14.1033 MHz, with specific regional frequencies also documented. Decoding software options for Robust PACKET include Wavecom W-Code and Wavecom W-Spectra. The mode is primarily supported by SCS's 'Tracker / DSP TNC' hardware.

This article explores the marriage of amateur radio and bushcraft, advocating the pleasure of setting up a portable station in nature rather than operating from the confines of a vehicle. The Parks on the Air (POTA) programme is highlighted as a catalyst for outdoor radio activities. The author shares his experiences and techniques, from transporting equipment into the wilderness to setting up shelters and antennas. Knot tying skills and the use of frogs are emphasized for efficiency, and a unique method for launching wire antennas is described. The article emphasizes the synergy between amateur radio and bushcraft skills, enhancing the enjoyment of radio operations in wilderness environments.

Chokes and isolation transformers are essential for receiving antennas to mitigate common mode current, which induces noise and interferes with signal quality. Common mode chokes, formed by winding feedline through ferrite cores, block unwanted current effectively. Proper selection of core material and winding turns ensures resonance near the operating frequency, reducing interference. Isolation transformers further minimize interference, crucial for multi-transmitter stations.

Wavelog, a web-based amateur radio logbook application, launched in February 2024, represents a significant fork from the established Cloudlog platform, developed by a core team including DF2ET and DJ7NT. This open-source project focuses on delivering advancements in both stability and functionality, specifically tailored for the amateur radio community. The application allows users to manage their radio logs from diverse environments, including professional servers, standard web hosting, or even compact _Raspberry Pi_ setups. The platform distinguishes itself through its emphasis on simplicity, robust features, and versatile accessibility, enabling operators to log contacts from virtually any location. It supports various operating modes and data formats, providing a flexible solution for tracking QSOs and managing station activities. The project's development is driven by the collaborative spirit of the amateur radio community, prioritizing utility and user experience over commercial objectives. Key features include comprehensive logging capabilities, support for multiple bands and modes, and integration with common amateur radio data standards, ensuring broad utility for DXers and contesters.

Nuts & Volts, founded in 1980, began as an advertising-based newsprint and evolved into a leading electronics magazine. A major shift came in 1992, introducing content-rich articles, columns, and DIY projects, cementing its role for hobbyists and professionals. Reformatted in 2003 to standard magazine size, it now averages 100 full-color pages on high-quality paper. Celebrating 40 years, Nuts & Volts remains the longest-running U.S. electronics publication, with loyal readers and advertisers since the 1980s. Its diverse topics span robotics, circuit design, automation, microcontrollers, and more, appealing to all skill levels.

The Amateur Radio Logbook ADIF File Analyzer available at loganalyzer.sv5fri.eu is a convenient web-based tool that allows you to upload your ADIF log and instantly generate a visual map of your QSO contacts along with detailed statistics—by band, mode, time, grid squares, DXCC, and more. It provides an intuitive overview of your operating patterns and performance without requiring any software installation.

Ferrite E-cores offer a practical solution for constructing baluns, especially when connectors are already mounted on cables. These cores, commonly used in mass-produced pulse transformers, allow for multiple turns without dismounting connectors, making them ideal for control and power supply cables. The material of E-cores is generally suitable for common mode baluns up to 15 MHz, providing a cost-effective option for amateur radio operators. E-cores can often be sourced from old switch-mode power supplies, adding to their appeal for those looking to utilize existing resources. A notable example involves a balun on a USB cable using a Ferroxcube E 32x16x9, 3F3 core with four turns, secured by three cable ties. This setup demonstrates the ease of construction and stability achievable with E-cores. Another example features a balun with eight turns of shielded cable with RCA connectors on the same core, achieving 140 uH inductance at low frequencies. The impedance plot for this configuration is measured between the shield ends, illustrating the effectiveness of E-cores in practical applications. The article includes detailed figures and descriptions, providing valuable insights into the construction and application of baluns using ferrite E-cores. These examples serve as a guide for amateur radio enthusiasts looking to enhance their setups with cost-effective and efficient solutions.

This article is from the book Ham Radio For Dummies and features some tips for portable amateur radio operations, on Field Day or generic outdoor operation, like selecting the proper antenna and portable power.

QRP is a way of operating that involves using low power transmitters, that are no more than 5 Watts for Morse or data modes, or 10 Watts pep for voice. Introduction to QRP operations

DX Data provides a unified view of real-time DX spots, aggregating data from **DXSpider**, the **Reverse Beacon Network (RBN)**, and PSK Reporter. This online service offers advanced filtering capabilities, allowing amateur radio operators to refine spot displays by DXCC entity, band, mode, CQ zone, and continent. It addresses the challenge of sifting through numerous DX spots by presenting a consolidated stream, enabling DXers to efficiently identify active stations across various bands and modes. The platform integrates with Club Log, which assists in fine-tuning band-entity combinations based on a user's logging history, thereby reducing irrelevant spot noise. Key features include DX email alerts, PSK Reporter tracking, and a custom watchlist for monitoring specific stations or regions. The service also incorporates a live news feed from DX World, providing current information relevant to the DXing community. This design aims to streamline the DX spotting process, offering a responsive interface for identifying operating opportunities.

Doppler Whistles from Meteor Trails, few hams know that meteors can be spotted without leaving the operating room. Identifying Meteor-Trail Reflections, Shooting Stars, Why the Meteors Whistle

The resource details the construction of a 433 MHz LoRa APRS iGate and a tracker, both built around _TTGO T-Beam v1.1_ microcontroller boards. Each board integrates an OLED screen, WiFi, GPS, and an SMA antenna connector, powered by an 18650 3.7 V lithium-ion battery or microUSB. The iGate operates on 433.775 MHz, with its status verifiable on aprs.fi, demonstrating practical implementation of LoRa-based APRS solutions. The methodology involves programming the modules using Visual Studio Code with the PlatformIO plugin. This process loads the necessary firmware and a JSON configuration file, which includes the operator's callsign and WiFi credentials for the iGate. The guide emphasizes the ease of programming and provides specific steps for configuration. Initial testing of the iGate and tracker, including smart beaconing configuration, is documented. The low power output of approximately 200 mW from the LoRa board's transmitter is noted, with suggestions for range extension through improved antennas or RF amplification. The author, N4MI, plans to deploy a higher-gain 70cm antenna for the iGate.

In this study, the author builds upon Muncy's research, demonstrating that radio-frequency current on cable shields affects audio systems through the "pin 1 problem" and shield-current-induced noise (SCIN). An enhanced equivalent circuit for ferrite chokes is proposed, addressing dimensional resonance and inductor self-resonance. Field tests confirm that chokes reduce interference across 500 kHz to 1,000 MHz. Guidelines for diagnosing and mitigating EMI from various sources are provided for product development and field installations.

The 1/4 wavelength vertical antenna project, initially designed for 20 meters, has evolved into a versatile portable solution covering 10 through 60 meters. K0BXB details its construction, emphasizing a bottom-loaded design with a tapped loading coil and four 10-foot counterpoise wires. The author shares personal experiences and field results, including **18 QSOs** during a park activation on 17m and 30m with 10 watts, and a **2,435-mile** contact with a contest station in Bonaire on 20m using 5 watts. Comparisons are drawn to commercial offerings like the _Wolf River Coils TIA_ and _QRPGuys Triband Vertical_, highlighting the DIY antenna's small footprint, light weight, and ease of tuning for POTA activations. The resource includes insights into using test equipment such as the _NanoVNA_ for SWR optimization and discusses various radiator lengths, from 17-foot wire to a 102-inch whip, demonstrating adaptability for different portable setups. Construction tips cover coil winding, tap placement, and connecting feedlines and radials using common components.

This document outlines various miniature projects undertaken by Mike Markowski to enhance his skills in GNU Radio. Key projects include an FM stereo receiver and an AM radio receiver, featuring advanced functionalities like pilot tone recovery and RDS integration. Additional experiments involve generating Gaussian noise, chirp signals, and Morse code decoding, emphasizing hands-on learning and customization in GNU Radio. The author encourages feedback and shares flow graphs and Python code for each project, aiming to foster community engagement and knowledge sharing.