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Antennas : 2M- Durable 2-Meter Yagi Antenna: PVC and Window Line Construction
- Discover the creation of a robust 2-meter, 3-element Yagi antenna using PVC pipe and window line. Designed for durability and portability, this innovative Yagi demonstrates enhanced signal strength, making it ideal for SSB and CW operation on the go.
[ Hits: 138 | Votes: 0 | Rating: 0 ]
- 70Mhz (4 metre) Delta Loop Antenna
- Discover the success story of creating a 4-meter Delta Loop antenna, ideal for improving radio communication. This horizontally polarized antenna offers efficient performance when mounted at VHF heights, catering to both HF and VHF characteristics. A simple, DIY project suitable for portable setups, providing versatile options for radio enthusiasts.
[ Hits: 53 | Votes: 1 | Rating: 4 ]
- Bent-end dipole antennas
- Discussion about laterally bent-end dipoles. Bent by percentage of length and fine-tuned by angling the bent ends.
[ Hits: 123 | Votes: 0 | Rating: 0 ]
- EFHW Anntenna 40-10 for QRP
- The author discusses their endeavour to create a compact, robust resonant antenna for QRP operations due to strong winds in their area. Primarily designed for 40m and 20m bands, the article offers adaptability for different bands. The author hints at future projects, including an extended 8010 EFHW variant, promising a lighter yet efficient design.
[ Hits: 53 | Votes: 0 | Rating: 0 ]
- Space-Efficient Excellence: Inverted L Multi-Band HF Antenna
- Discovering a solution for limited space, the inverted L HF antenna emerges as a stellar performer. Half the size of a dipole, it ensures optimal installation in restricted areas, maintaining superb transmission (TX) and reception (RX) characteristics. Spectrum Communications' multi-band version, featuring traps, proves even more space-friendly without compromising performance. A fiberglass pole offers sturdy support, while proper grounding, an RF choke, and occasional tuning contribute to a high-performing and reliable antenna system.
[ Hits: 186 | Votes: 0 | Rating: 0 ]
- Angle of OCF L-Dipole Antennas
- This page is a discussion about impedance matching by Off Center Fed dipoles in the Wide L-form. When a vertical or horizontal dipole is bent into a 90 degree L-form, the impedance drops about half.
[ Hits: 76 | Votes: 0 | Rating: 0 ]
- A Compact and Stealthy Field Portable Antenna
- In the quest for an ideal field portable antenna, the author recounts experiments involving various wire configurations. While a previous candidate, a 41ft random wire, proved effective but lacked stealth, the search led to a surprising rediscovery of a design previously rejected—the Rybakov Antenna. With a focus on simplicity, rapid deployment, and multiband capability, the author explores the versatility of a 26ft Rybakov, avoiding the halfwave trap. The article delves into the antenna's performance and its potential as a discreet, resonant solution for field operations, addressing the challenges encountered during a POTA activation. Additionally, the Unun/Balun design used in conjunction with the Rybakov Antenna is discussed, providing insights into achieving a balanced system.
[ Hits: 153 | Votes: 1 | Rating: 1 ]
- Yaesu ATAS-120A Portable Tripod: Enhancing Efficiency
- In this post by N6CTA, discover the conversion of the Yaesu ATAS-120A screwdriver antenna for portable use. The author details the creation of two sets of radials, 16 and 32 in 16ft lengths, aiming to optimize the efficiency of ground-mounted antennas. Additionally, insights are shared on attaching male quick disconnect blade tabs, with potential plans for a radial plate kit.
[ Hits: 87 | Votes: 0 | Rating: 0 ]
- Performance of 49:1 Ferrite Core Transformers
- There are quite a few recipes for building a suitable transformer for an end fed half wave antenna (EFHW), but I was never sure I really understood the main principles. So, I wound a bunch of transformers, made measurements on them using my NanoVNA, learned how to get what I really wanted out of the VNA measurements, and in the process discovered how to build better transformers and be able to predict what they will do
[ Hits: 151 | Votes: 4 | Rating: 7 ]
- DX EXPLORER - Step Into The Amateur Radio World
- DX Explorer is a blog tailored to amateur radio enthusiasts, with a special focus on DIY radio equipment. Geared towards beginners, the author shares their learning journey, emphasizing that the thrill of discovery and growth is the essence of this engaging hobby.
[ Hits: 29 | Votes: 2 | Rating: 10 ]
- Mapping the Australian Radio Landscape
- Discover a comprehensive solution for mapping Australian ham radio entities using data from the ACMA Public Register. This tool, developed in Delphi 7, generates KML files for Google Earth, showcasing repeaters, beacons, and operators across different prefixes. While respecting privacy regulations, the files provide valuable insights into the amateur radio landscape.
[ Hits: 52 | Votes: 0 | Rating: 0 ]
- CubeSat.org
- This website provides information and resources for CubeSat developers, including a directory of CubeSat projects and a forum for discussing CubeSat-related topics. The CubeSat standard facilitates frequent and affordable access to space with launch opportunities available on most launch vehicles.
[ Hits: 12 | Votes: 0 | Rating: 0 ]
- 40 MHz 8m Band Amateur Radio Exploration
- The 8m ISM band, a unique frequency range between 10m and 6m, holds potential for amateur radio enthusiasts, yet it remains largely unallocated. This spectrum offers fertile ground for research and self-training. The author's experience with low-power transmissions and WSPR testing highlights the band's capabilities and the need for a narrow, speech-free amateur allocation to encourage experimentation. Discover the world of 8m ISM radio exploration and its future possibilities.
[ Hits: 74 | Votes: 1 | Rating: 8 ]
- Propagation on 630 Meters and 2200 Meters
- This is a theoretical look at propagation on 630-Meters and 2200-Meters using ray tracing software. It expands on the brief discussion in the ARRL Handbooks.
The Earth's magnetic field affects 630-Meter and 2200-Meter band propagation. Lower ionization reduces absorption, aiding low-frequency propagation. Differences exist between bands, limited daytime sky-wave propagation. Sunrise/sunset show promise, yet mechanisms are unclear. Ducting possible at night in specific conditions. Negative ions enhance propagation. Inefficient antennas and high man-made noise are anticipated. Groundwave propagation is significant on 2200-Meters.
[ Hits: 38 | Votes: 1 | Rating: 10 ]
- Yaesu FT-818 Details
- Yaesu FT-818ND HF VHF UHF All mode portable transceiver. Announced in 2018, production of this QRP all mode portable transceiver has been discontinued some years later.
[ Hits: 42 | Votes: 0 | Rating: 0 ]
- National Radio Club (NRC)
- The NRC Archives feature past DX News and DX Audio Service publications, offering a glimpse into the "Heyday" of BCB DX. Subscribe to DX News for essential information, 20 bulletins annually, and membership privileges with discounted NRC products. New visitors can download a free sample copy of DX News
[ Hits: 27 | Votes: 0 | Rating: 0 ]
- AllScan
- AllScan is a free and open-source web app for AllStar nodes that provides Favorites Management features, AllStarLink Stats integration, and connection monitoring and control functions.
Shows your favorites in a Dashboard summary table with Keyed status, Connected Node count and other statistics.
Continually scans the status of each favorite using ASL's Stats API data showing which favorites are active and have recently been active.
Allows favorites to be connected with a single click (optionally automatically disconnecting any currently connected nodes first).
Allows the Favorites Table to be sorted by Node#, Name, Description, Location, etc.
Favorites can be added/deleted simply by entering the node# and clicking a button.
These features finally give AllStar nodes similar memory management and scan capabilities that analog radios have had for decades. AllScan is mobile-friendly and optimized for ease of use on both small and large screens. AllScan follows the latest web development standards, with PHP, JavaScript, HTML, and CSS cleanly partitioned, runs on both ASL and HamVOIP, and is very easy to install, configure, and update.
[ Hits: 20 | Votes: 1 | Rating: 8 ]
- Skywave Linux
- Linux for shortwave and amateur radio monitoring. Supports popular SDR hardware and online streaming from KiwiSDR, WebSDR, and Spyserver sites. Articles about using Linux with your SDR devices.Skywave Linux, an innovative operating system, leverages cutting-edge technology for seamless access to radio signals globally. Ideal for regions with limited internet access, it effortlessly connects to a network of SDR servers, offering high-performance SDR operation without the need for extensive hardware. With pre-installed and configured SDR software, Skywave Linux simplifies signal discovery and operation for all users.
[ Hits: 285 | Votes: 0 | Rating: 0 ]
- AI-Powered Radio Signal Cleanup: Battling QRM in Real Time
- Amateur radio enthusiast Jean-Paul Suijs discusses combating manmade noise (QRM) in radio signals using AI. Detailing experiments with phase-shifting techniques and the self-learning nature of AI, he explores AI-based audio processing apps for real-time noise cancellation during radio contests, demonstrating results on both medium wave and shortwave bands.
[ Hits: 71 | Votes: 0 | Rating: 0 ]
- RF-Quiet Solar PV for Ham Radio
- 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.
[ Hits: 78 | Votes: 1 | Rating: 1 ]
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