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An omnidirectional and horizontally polarized VHF antenna by EA4EOZ

Installing a classic G5RV Antenna in Slopinv-V mode by AI4WM

Delta loop antennas for 40 meters plans and comparison of some models

The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.

This is a one for all antenna tuner with wide range tuning on all the HF bands. The tuner is based on a G3WQW design. DIY project by PD7MAA

Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers

The Speaky HF SSB transceiver and other homebrew projects Homebrew of radio equipment, antennas, tuner, etc.

A post about the construction and measurements of a Resonant Feedline Dipole cut for the 10M band

Offer various contest logging programs, for scandinavian contests, SPDX, PAXX, OK/OM Contests, IARU VHF Contest, Portugal Day DX contests, HSC contest, various polish and norwegian local contests and other utilities

The page discusses the concept of a 2-element Parasitic Ground Plane antenna for the 40-meter band. It includes a conversation between amateur radio operators discussing modeling results and design considerations for the antenna. The author shares insights on radial configurations and the impact on antenna efficiency and pattern.

Call Book Log 3.0 is a web-based logging solution for amateur radio operators, designed for self-hosting on a web server with MySQL/MariaDB and PHP 7+ support. It provides a mobile-friendly interface for viewing, adding, editing, deleting, backing up, and restoring QSO logs. The software features a streamlined setup process, allowing users to quickly deploy a personal logging system accessible via any web browser. Key functionalities include displaying the last **5** contact dates for previously worked stations, enhancing log management by providing immediate historical context during QSO entry. The system also includes a central administrative section for authenticated users to manage log entries. The 3.0 version represents a significant code overhaul, focusing on improved performance and a more *visually appealing* user experience compared to earlier iterations. Enhancements include better pagination, a redesigned menu with icons, and color-changing rows for improved readability. The add log page now incorporates a one-click time update feature, addressing user feedback regarding time synchronization during rapid QSO entry. This iteration builds upon previous versions like 2.1, which corrected an automatic _UTC date_ bug, and 2.0, which featured a full rewrite to resolve browser quirks and optimize search functions. The software's evolution demonstrates a commitment to functional stability and user interface refinement.

Improve the stability of your Yaesu G-250 rotator.

Presents construction details for Moxon antennas, specifically focusing on 10-meter and 17-meter band configurations. It covers practical aspects of building these directional wire arrays, including element spacing, feedpoint considerations, and material choices for optimal performance. The resource emphasizes homebrewing techniques suitable for amateur radio operators. Discusses the advantages of the Moxon rectangle design, such as its compact footprint compared to a full-size Yagi and its favorable front-to-back ratio. It provides insights into achieving proper impedance matching and structural integrity for portable or fixed installations. The content includes photographic examples of constructed antennas. Explains the iterative process of tuning and optimizing Moxon antennas for specific frequency segments within the 10m and 17m bands. It offers guidance on minimizing SWR and maximizing gain, drawing from real-world building experiences to assist constructors in replicating successful designs.

Shortwave listener blog from near Rome Italy

A morse keyer project made on Arduino, inlcudes the main program script by m0xpd

My Ham Shack - Personal Ham Shack Web Pages - At MyHamShack you get a free personal web page for your shack - Your Shack. Your Ham Shack Pictures, Blogs and Projects.

Personal SWL log with various information from SWL tips and tricks to Frequecy Logs to general SWL information.

The Roma2 WebSDR provides remote access to a software-defined radio receiver situated in Rome, Italy, enabling users to listen to various amateur radio bands. It features a user-friendly web interface with controls for audio gain, DSP filtering, and bandwidth selection, including options like **2.4 kHz**, **3.0 kHz**, **4.0 kHz**, and **6.0 kHz** filters. The system supports both desktop and mobile device access, with a dedicated mobile version available for optimized performance. Operating as part of the _ROMA SDR Network_, it logs user activity, automatically recording time, frequency, and DXCC information for each session. The platform also addresses common browser-specific audio issues, such as white noise in _Chrome_, by suggesting workarounds like muting/unmuting or using alternative browsers like Firefox.

Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept

7O6T log oline - 7O6T Club Log

This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.

Cushcraft A3S HF antenna 1:1 balun repair.

Operating magnetic loop antennas requires careful consideration of RF safety, particularly regarding near-field magnetic field intensity. This resource presents calculations for magnetic field strength (H-field) at various distances from a magnetic loop, emphasizing that the H-field is significantly higher than the E-field in the near-field region due to the inductive nature of the radiating element. It provides specific formulas and examples for determining safe operating distances based on power levels and loop dimensions, crucial for compliance with RF exposure limits. The analysis compares calculated H-field values against FCC and ICNIRP maximum permissible exposure (MPE) limits for controlled and uncontrolled environments. It demonstrates that even at QRP power levels (e.g., 5W), the H-field can exceed MPE limits within a few feet of the antenna, necessitating greater separation distances than often assumed for electric field considerations. The practical application of these calculations helps amateur radio operators configure their stations to ensure personnel safety and regulatory compliance when deploying compact, high-Q magnetic loop antennas.

This antenna article is geared towards new Hams and antenna builders looking for a very inexpensive 6 band antenna that can be efficiently fed with 50 ohm coax without a tune

Francisc Grunberg, YO4PX, shares his insights and translations on various amateur radio topics through his blog. Content includes historical perspectives on ham radio, detailed accounts of _DXpeditions_, and discussions on ethical operating practices for DXing and contesting. The site also offers practical advice, such as suggestions for navigating pile-ups and improving contesting strategies. The blog delves into the intricacies of the hobby, providing guidance for operators aiming to improve their skills and understanding. It covers subjects like Codes of Conduct for amateur radio and lists the **most wanted DXCC entities**, offering a valuable resource for those pursuing awards. Francisc's contributions reflect his extensive experience, providing a unique perspective on the amateur radio landscape.

Adam Brown's Blog from Latitude 80.19 South Longitude 81.16 West

A fully equipped amateur radio mobile radio shack by VE6AB

Stop common-mode current when transmitting with an end-fed antenna. Unbalanced antennas are very prone to currents on the outside of the coax.

How to receive JT-65 signals using a cheap RTL-SDR dongle with the 820T2 tuner chip

Irish ham and Vhf radio info. Logs and maps worked, no excuses, this is mainly a VHF site

The latest info on the world of radio including:world,shortwave,pirate,digital,mw,lw news,links.

Pictures and description of a SteppIr vertical antenna setup in a small backyard using DX Engineering radial plates.

Presents the construction of a 2-meter **Skeleton Slot Yagi** stack, detailing the design process and practical considerations for VHF operation. The author shares insights from building and testing this antenna, emphasizing its performance characteristics for local and extended range contacts. The project outlines the specific dimensions and materials used, providing a clear path for other radio amateurs to replicate or adapt the design for their own stations. The resource covers the unique aspects of the Skeleton Slot radiator, explaining how its geometry contributes to gain and pattern control. It includes discussions on impedance matching and feedline considerations crucial for optimizing power transfer and minimizing SWR. The article draws on real-world testing, offering practical results that validate the theoretical design. This project serves as a valuable reference for those interested in custom VHF antenna solutions.

Welcome to SW2A special contest station, with photos, logs and results

An homebrew project of a full wave delta loop antenna for the 40 meters band with dimensione, picture and assembling instructions in Indonesian

KD8KSB realization of the CJU satellite antenna that allow similar performance to the arrow antennas.

A wire antenna feeded with an unsymmetrical feed and a 1:4 balun can be tuned from 6 to 80 meters band but can be noisier than a dipole and cause RF in the shack

Pictures and description of a homemade 1.3 GHz and 2.4 GHz RF Signal Source

ik3qar Logs on line of IOTA EU131 / IIA expeditions

The article presents a detailed examination of 40-meter wire antenna performance, specifically focusing on the impact of antenna height on gain and radiation patterns. It quantifies how a 40-meter dipole at 1/8 wavelength above ground exhibits a high-angle radiation pattern, while raising it to 1/2 wavelength significantly lowers the take-off angle, improving DX capabilities. The author, VE3VN, leverages _EZNEC_ simulations to illustrate these changes, providing visual representations of the antenna's lobe structure at different elevations. Comparing a single dipole to a two-element wire array, the analysis shows that a 2-element array at 1/4 wavelength height can achieve **3.7 dBd** gain, outperforming a single dipole at the same height. This gain is further enhanced to **5.7 dBd** when the 2-element array is elevated to 1/2 wavelength, demonstrating the practical benefits of optimizing both element count and height for improved signal strength and directivity on the 40-meter band. The findings offer practical insights for hams seeking to optimize their wire antenna installations.

AM DXing taken to the extreme. Reports and station logs from DXpeditions to Arctic Northern Finland. Also articles, QSL news, links, audio and video on AM DXing. Published by Finnish DXer Mika Mikelainen.

A no ground antenna solution for backpackers, balconies or plastic car bodies, like RV or other portables uses where is difficult to find a good counterpoise by PD7MAA

Android app by VE3VN that show view of night, day and terminator around the globe. This gives a strong hint of which bands and compass directions to focus on for best results.

Homebrewing dummy load by M0XPD

Special logging program, optimized for mobile, portable, and field operations. This software exports data in the ADIF which then may be imported into your general logging software, or online services. Currently available for Android.

Setting up a new antenna Mast for dipoles at VE3VN

Demonstrating the construction of a short dipole antenna tailored for the 60 meter band, this resource provides detailed instructions for radio enthusiasts with limited space. The design incorporates inductive loading using two inductors (L1/L2) made from PVC tubes, allowing for effective operation on 5 MHz. The antenna consists of 12 meters of wire, divided into four sections, with specific dimensions and materials outlined for optimal performance. Results from users indicate that this antenna can significantly enhance DXing capabilities on the 60 meter band. Feedback from operators suggests that while the design is effective, adjustments may be necessary based on individual setups, such as coil diameter and wire gauge. Many users report successful construction and operation, with some experimenting with variations to improve resonance. The practical application of this antenna design has led to successful contacts and improved signal quality, making it a popular choice among 60 meter band operators.

An interesting article about planning and testing beverage antennas for 80 and 160 meters in a rural location

Testing log wire antennas and a unun by G0KYA

Cutting out the noise using a simple coax filter to improve the poor front end filtering