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Build a Ham Radio Voice Keyer for the Backpack

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.

World Radiosport Team Championship, Germany July 12-16 2018

The author shares a unique experiment with a 200ft Grasswire antenna—laying wire directly on the ground. Despite inherent losses, the setup enables successful radio communication with a Kentucky station, highlighting the antenna's practicality for portable use with minimal power.

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.

Hostilog, developed by DF1LX using Python 3.5 and PyQT5, is a logging application designed for high-speed QSO data entry, achieving rates of 300–400 QSOs per hour from handwritten logbooks. The software prioritizes keyboard input, minimizing mouse usage for efficiency. It incorporates a cluster window with RegEx filtering capabilities and facilitates UDP transfer of QSO data to _DXkeeper_ from the _DXLab Suite_. The program supports basic rig control via _Hamlib_, with configuration examples provided for radios like the TS-590S using `rigctld`. Hostilog can process 50,000-line ADIF files in under 10 seconds and includes features for combining and sorting ADIF data. While primarily a Windows application, it runs under _WINE_ on Linux, with specific notes on Ubuntu compatibility. Recent updates, including a version from August 28, 2024, address bugs and improve UI, with documentation available in both German and English.

Learn how to easily improve your handheld VHF performance on the 2-meter band with the Flowerpot antenna. This simple DIY antenna made from coaxial cable requires minimal tools and materials, providing a big range upgrade compared to standard rubber-duck antennas. Discover how to build, tune, and optimize the Flowerpot antenna for excellent performance. Ideal for hams looking for lightweight, portable solutions for handhelds, mobile rigs, home stations, SOTA/POTA activations, and emergency communication.

The article describes a high-gain, compact beam antenna design for the 2-meter band (144-146 MHz). The NSH 4x4 Boomer is a 4-element antenna that is mounted on a 4-foot boom with an 8.2 dB gain, 1.2:1 SWR, and a front-to-back ratio of 18 db. It is designed for mobile operations and little area, making it perfect for field usage such as disaster management. The design employs regularly spaced parts with a straightforward gamma match for tuning, and the construction materials include a square boom and polished aluminum tubes. In local and portable tests, the antenna worked regularly, achieving contact distances of up to 15 kilometers.

Key clicks are generally undesired clicks or thumps generated by a CW transmitter as the key is put down or let up. How much does the rise time or bandwidth of a CW signal need to be limited to prevent other QSOs on adjacent frequencies from being annoyed by key clicks?

This fall/winter 2 events has happened at about the same exact time. I finally got around to putting up an end fed long wire for 80M (and maybe 160M) The fridge big the bullet and we ended up purchasing a new fridge.

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.

If you are having problems with RFI from Solar Panels this document from QST provides useful advice. According to this article it is possible to prevent and mitigate RF interferences, with your amateur radio equipment, by suppressing the RF either in the shack and to the solar power infrastructure.

A webSDR receiver running on 8 HF Bands based in Bordeaxu France

SkyRoof is an open-source, 64-bit Windows application designed for amateur radio operators and satellite enthusiasts, combining satellite tracking and Software Defined Radio (SDR) functionality in a unified platform. The software provides real-time satellite tracking, pass predictions, and visual representations through Sky View, Earth View, and Timeline displays. It features an SDR-based waterfall display covering VHF/UHF satellite segments with Doppler-corrected frequency scales, automatic satellite labeling, and visual tuning capabilities. SkyRoof supports various SDR devices (Airspy Mini, SDRplay, RTL-SDR), external transceiver CAT control, and antenna rotator integration. The application automatically downloads satellite data from SatNOGS and other sources, offers voice announcements for satellite passes, and includes comprehensive frequency control with Doppler tracking, manual corrections, and RIT functionality for enhanced satellite communication operations.

CQ ham radio, Japanese monthly ham radio magazine publieshed since 1946 by CQ Publishing Co., Ltd. It has no relation with CQ Amateur Radio US magazine.

This article discusses the potential for solar power systems to coexist harmoniously with amateur radio, challenging the notion that they are inherently incompatible. Drawing from personal experience, the author emphasizes the importance of selecting RF-quiet components, focusing on series-string Sunny Boy grid-tie inverters. The article also highlights considerations for system design and limitations based on roof orientation, shading, and array size. Overall, it presents a valuable perspective on creating a radio-friendly solar PV setup.

Arduino/ATtiny Based (Ham Radio) ICOM CIV to Yaesu BCD Band Decoder. Build a ICOM CIV to Yaesu BCD Band to automatically band switch the Yaesu Quadra Amplifier.

This article help on explaining what you need to start with amateur radio. By using a local ham radio club station to purchasing second hand radio equipment and how to get help on installing antennas.

A half wave wire that is tuned for resonance on 80m will NOT be resonant on 40m despite a precise harmonic relationship between the two bands. The End Effect is caused by a capacitive coupling between an unterminated wire end and the ground.

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 most basic form of repeater receives communication on one frequency and re-transmits it on a different frequency, a process known as duplex communication. This capability significantly extends the range of handheld and mobile radios, as repeaters are typically situated at elevated locations with high-gain antennas and greater transmit power. Repeaters commonly operate with FM modulation on the VHF (30 MHz – 300 MHz) and UHF (300 MHz – 3 GHz) amateur bands, which are ideal for portable and mobile devices. Access to repeaters is often controlled by a CTCSS or PL tone, an inaudible signal that prevents the repeater from retransmitting background noise. This mechanism ensures efficient use of the frequency and prevents illegal continuous transmission. Canadian regulations, for instance, require an Advanced amateur radio license and an available frequency within the band to set up a repeater, each assigned a unique call sign and transmit frequency. Configuring a radio for repeater use involves knowing the repeater's transmit frequency, its receive frequency offset (e.g., -600 KHz for VHF or +5 MHz for UHF), and the necessary CTCSS tone. The article references resources like Repeater Book for locating repeaters and provides practical examples for initiating and concluding a basic repeater session, emphasizing clear identification and concise communication.

Reviews for Elecraft K4 HF Amateur HF 6M VHF UHF at eham.net

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.

This presentation on antennas is a practical guide for amateur radio operators. The key takeaway is that the best antenna for your station depends on your constraints and goals. There is no magic solution and buying a wire antenna is not recommended as it might be expensive and not as effective. The presentation covers different antenna types including dipoles, verticals, Yagis and loop antennas. Important factors to consider when choosing an antenna include SWR, feeder types, and whether you need a balun. The author emphasizes that ATUs don’t improve a poor antenna and advises against obsessing over SWR readings.

Radio Frequency Interference (RFI) has always been a source of concern for the Radio Amateur. Until the recent introduction of complex circuitry in the home, our communications gear has been the main source of potential RFI. In this computerized age of ours, increasingly complex and sensitive receivers are being barraged by these and other sources of RFI.

This page discusses the CLEFHW (Coil Loaded End-Fed Half-Wave) antenna, a portable variation of the popular EFHW design for ham radio operators. The article explains how the CLEFHW allows for backpack portable operation without the need for trees or poles, making it ideal for POTA activations and rapid deployment scenarios. The author details the design, optimization for 20m band, and compares efficiency to full-length wire antennas. Suitable for hams interested in portable antenna solutions and quick setup options for amateur radio activities.

A vertical delta loop is a practical antenna for low bands, popular for its simple design requiring just one support. Its shape, an equilateral triangle in free space, yields optimal gain and radiation resistance. Deviating from this shape lowers performance. The delta loop can be polarized either horizontally or vertically based on the feed point location. In vertical polarization, it acts as two quarter-wave verticals with the baseline feeding one side. This design minimizes radiation from the baseline while maintaining effective operation.

This article focus on the radiation angle of vertical antennas and the fundamentals of electromagnetic wave propagation. The calculation of antenna length at 145 MHz is followed by an explanation of electromagnetic wave speed and the link between wavelength, frequency, and velocity. Author discusses the 5/8th wave vertical antenna, namely its performance and the influence of radiation angle on signal transmission. Figures and analogies demonstrate how different antenna types produce distinct radiation patterns. This highlights the importance of selecting the right antenna for a certain purpose, such as local traffic or dxing. The article discusses a variety of factors that affect antenna performance, including SWR, propagation conditions, and equipment dependability

During radio's early days, high frequencies were under 30 MHz due to technical limitations. As understanding grew, components improved, allowing for higher frequencies like VHF and UHF up to 3 GHz. The HF band's long wavelengths provide unique propagation challenges influenced by solar activity. VHF and UHF bands face diffraction and reflection issues but offer diverse applications, from amateur radio to 5G and GPS technologies.

Discover how the author, KK4Z, has perfected his Frankentenna over the years for portable operations, especially for Parks on the Air (POTA). Learn about the components sourced from different companies like Buddipole and Chameleon, allowing for versatility as a vertical antenna, endfed with a counterpoise, or even a dipole. The article also covers specific tweaks and modifications made to enhance performance. Ideal for hams looking to optimize their portable station setup with a reliable and lightweight antenna solution.

This page delves into the debate surrounding the End-Fed Half-Wave (EFHW) antenna, exploring whether it is truly a multiband antenna without the need for a tuner. The author investigates the claims and criticisms surrounding these popular antennas, discussing their resonance on various bands and their efficiency for DXCC achievements. The content is valuable for hams interested in understanding the capabilities of EFHW antennas and their performance across different HF bands, with a focus on practical usage and real-world results.

Learn how to design a Hentenna antenna, a portable asymmetrical double-loop antenna ideal for amateur HF or VHF bands. This page provides details on constructing and optimizing the antenna for maximum performance in DX communications. Discover how altering the antenna's vertical feed section can adjust the VSWR resonant frequency and how changing the support pole's position can alter the beam direction. Originally developed by Japanese 6-meter operators, the 'Hentenna' offers a unique design that allows for horizontal polarization when vertically oriented. Explore radiation patterns, VSWR charts, and antenna currents diagrams to optimize your antenna's performance for long-distance contacts.

Focusing on the Indian amateur radio community, this resource provides a collection of articles covering news, technical tutorials, and DIY project instructions. It features content on various aspects of ham radio, including club activities, circuit ideas, and general information relevant to operators in India, often referencing local events and regulations. The site serves as a central point for information exchange within the region. The author, VU3HZW, shares insights and practical guidance, drawing from personal experience to present topics such as antenna construction and station setup. The content aims to support both new and experienced hams, with articles detailing specific projects and offering practical advice for improving station performance or engaging in local ham radio activities. For instance, one article might detail a simple _QRP transceiver_ build, while another could discuss optimal antenna placement for **local nets**.

Learn how to easily build a 10-meter vertical antenna, perfect for DX contacts on the amateur radio bands. This flowerpot or T2LT design is portable, efficient, and ideal for ham radio operators looking to improve their DX performance. With just a few basic tools and materials, you can construct this antenna for portable operations or as a home station setup. Discover how to set up the antenna, improve its performance by raising it higher, and start making contacts with stations around the world. Watch a step-by-step guide on YouTube for building and testing this DIY ham radio antenna.

Designed for the FT-817, this audio speech compressor, centered on the Analog Devices SSM2165, offers a 40 dB compression range, enhancing signal power. Built externally with the SMD version to preserve warranty, the circuit interfaces smoothly with electret microphones. Testing shows a 6 dB average power increase. Adaptable to rigs with electret microphones, it maintains unity gain and 40 dB compression.

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.

Hamlog is online cloud platform for active amateur radio operators. It supports various on the air activities of various clubs, associations and national amateur radio organizations, allows them to create award programs and deliver awards to those who earned them. Hamlog also has a built-in real-time logger, which allows operators to enter QSO in the system as they make them. It supports multiple callsigns, multiple locations, multi-station activities, etc. Soon it will allow to connect transceivers and other ham radio devices right to the browser, allowing easy online logging virtually anywhere.

Spotty leverages Philip Gladstone’s pskreporter.info data, delivered via an MQTT broker by Tom Fanning (M0LTE), to offer a responsive web application for visualizing propagation. The Map View presents a default visualization (grid AA00 / callsign MY8CALL) and distinguishes signal types: small spots for signals heard by a location, large spots for transmissions from a location, and teardrop markers for transmissions from the monitored callsign. Clicking a spot reveals detailed signal data in an overlay. The application includes a Log View for raw spot data and a Settings tab for customization. Users can filter tracking by specific Callsign or Grid, with preferences saved to the browser. A notable feature is the Time to Live (TTL) setting, adjustable from the default 60 seconds, which controls spot visibility duration to manage map clutter during high-traffic periods. The tool provides a clear, logic-driven interface for real-time signal monitoring.

Online phonebook of Hams Over IP. List of all registered HoIP Extensions, but even active BLK, Conferences, and allstar Links. HoIP is a free VoIP service for hams.

Online browser-based resource for your computer, tablet or other mobile device. Use this review and practice exam resource with the current editions of ARRL License Manuals.

This page provides a detailed guide on building a 25 Watt QRP dummy load for hams. It includes a list of required parts and supplies, along with a documentation section. The project is aimed at hams interested in QRP operations and looking to build their own dummy load. The page offers step-by-step instructions and resources to help hams successfully complete the project.

This website serves as a platform for announcing satellite activities, allowing amateur radio operators to publicize their plans for upcoming scheduled passes. It also offers a useful scheduling feature that provides satellite pass information tailored to your location, which you can input by entering your locator.

In an innovative analysis, Michael G7VJR employs NeuralProphet to predict ham radio modes' usage trends. The AI model, leveraging deep learning, forecasts a steady FT8 dominance, with slight declines in CW and Phone activities. This approach simplifies statistical predictions, showcasing the power of AI in understanding complex patterns and facilitating insightful time series projections. Access the freely available Club Log data for continuous exploration.

The HamAlert Cluster Client is a Windows program developed by OE3IDE to connect to the HamAlert system created by Manuel Kasper (HB9DQM). This system notifies users of new spots using various criteria through app notifications, SMS, Threema, and Telnet. The HamAlert Cluster Client enhances this functionality by providing taskbar notifications on Windows 10 and 11 PCs. The program is easy to use, requiring no installation—just download, unpack, and start. It includes features like a logfile for tracking activities.

Boondock Echo offers a revolutionary communication experience with an internet-backed recording and playback device for two-way radios. It ensures clear, reliable communication in remote or challenging conditions. Key features include real-time recording, internet connectivity, seamless integration, playback flexibility, rugged design, and a user-friendly interface. Services include product training, hardware maintenance and repair, customization, and regular firmware updates for optimal performance.

This article introduces TAP, a morse code alternative mode designed for HAM radio operators. Developed by sv3ora, TAP eliminates the need for extensive training and provides a user-friendly communication option. Learn more about this innovative mode and how it can enhance your radio experience. Visit the main site for additional information.

This article provides an in-depth review of the Ciro Mazzoni Baby Loop Ham Radio Antenna. The author, a ham radio operator, compares this magnetic loop antenna with his usual End Fed Half Wave antenna, discussing the performance and installation considerations. The post explains the concept of loop antennas, resonating frequencies, and the benefits of using a small loop antenna with a capacitor for optimal operation. If you are looking for information on magnetic loop antennas and their effectiveness in restricted spaces, this review offers valuable insights and practical experiences for ham radio operators.

The article discusses the use of SDR# (SDR SHARP) software for SDR receivers, highlighting its Band Plan feature that visually represents RF spectrum allocations. The author modified SDR# to display detailed IARU HF band plans, creating three XML files for different IARU regions. These files include various operational modes and specific frequency allocations. Despite potential errors, the modifications aim to enhance the usability of SDR# for ham radio operators. The article includes references and download links for the XML files and IARU band plans.

Provides a comprehensive overview of the Hentenna design, construction methods using aluminum tubing, and discusses its bidirectional characteristics with illustrative photos

Inrad Roofing Filter installation instruction, The IC-775 Roofing Filter Mod consists of a 6 pole, 5 kHz wide filter followed by a high dynamic range, feedback amplifier.