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With this tool it is possible to create QSO maps overlay on Google maps there each QSO get a line from the home location to each DX location. An EDI logbook file is used as input. The creation will only use complete locator in the 6 characters format. -
5-element antenna, with which G0JJL has worked lots of EU crossband, and won the RSGB Christmas Cumulatives 70MHz section twice in a row. -
Antenna designs that K5TR have collected from various sources. -
Amateur radio good operating practices by KG9OM -
This PDF document details the construction of a **70 MHz** Big Wheel antenna, a horizontally polarized omnidirectional array. The design utilizes three full-wave loops, each approximately **2160 mm** in diameter, arranged in a triangular configuration. The resource provides mechanical dimensions for the antenna elements and a comprehensive bill of materials, specifying component quantities and types, such as M8 stainless steel bolts, 15x15x1.5 mm square aluminum tubing for spacers, and 8 mm aluminum rod for the arcs. The central hub is constructed from two 160x160x8 mm aluminum plates, with four 40 mm long polyamide insulators supporting the radiating elements. The feed system incorporates a 50 mm diameter aluminum pipe for mounting and a matching stub constructed from a 120x20x2 mm aluminum sheet, connected via M8x10 mm bolts. The resource includes a diagram illustrating the mechanical dimensions and assembly points, including the N-connector fixing point and the center conductor attachment. The project was published on May 25, 2011, by Peter OE5MPL and Rudi OE5VRL. DXZone Focus: PDF | 70 MHz Big Wheel | Mechanical Dimensions | **2160 mm** loop diameter -
Most people are not familiar with antenna tuners and what a antenna tuner actually does. -
Homemade Loaded Coil Dipole ( w8010 diamond ) for 10, 15, 20, 40 and 80 meter -
A PDF File of a Maria Maluca multiband HF antenna with schematic diagram, dimension and plan -
Don't neglect one of the most important parts of your station! -
Enhanced SSB Audio (ESSB) is a specialized operating mode that extends the capabilities of traditional Single Sideband (SSB) voice transmissions. This presentation by K4QKY delves into the technical aspects of ESSB, discussing its advantages and the ongoing debates within the ham radio community regarding audio quality and bandwidth usage. ESSB aims to provide clearer and more natural-sounding audio, which can enhance the overall communication experience for operators. The presentation covers various topics, including microphone selection, audio processing techniques, and the importance of proper equalization. It also addresses the controversies surrounding ESSB, such as the potential for interference and the debate over whether it strays too far from traditional SSB practices. By understanding these elements, amateur radio operators can make informed decisions about their audio setups and contribute to discussions about the future of SSB operations. -
Ever need a way to estimate the amount of wire to add to or remove from a center-fed wire dipole antenna to achieve resonance at a desired frequency? This article help to determine correct wire lenght. -
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An interesting article on loading short vertical monopole antennas, representing six different methods. Base loading, Center Loading, Top Loading, Continuous loading, half and half loading and capacitive top loading. -
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History of codes of the world, russian codes, visual codes, and al long collection of telegraph codes as used worlwide including the international morse code and the relative variations -
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To aid in learning and improving Morse code proficiency, this resource offers an extensive collection of downloadable MP3 audio files. The content includes character practice groups, common words, punctuation, and full-length novels, all rendered in CW. Speeds incrementally increase, catering to both beginners and those aiming to build speed, with options for _Farnsworth_ spacing at lower WPM and standard spacing for higher rates. The resource also provides a Perl script, `gus_morse.pl`, allowing users to generate custom audio files from UTF-8 text. Users can download archives of sequential MP3 files, with options for English, German, Spanish, Esperanto, and Italian content. The audiobooks progress from **5 WPM** to over **40 WPM**, with some archives offering _omnibus_ collections of multiple works. The site emphasizes the importance of consistent daily practice and patient aural observation to develop procedural memory, moving beyond conscious dit and dah counting to direct character recognition. It also details the transition from Farnsworth to normal spacing, aligning with FCC and ARRL recommendations. -
Learn how to start using ham radio satellites for your DX contacts, PDF presentation by Dave Long -
Assembling a Code-Practice Oscillator, a PDF by ARRL -
The ZS6BKW multi-band antenna, an optimized variant of the classic G5RV, is presented with detailed construction and tuning instructions. This resource outlines the antenna's design principles, which were developed by _Brian Austin (G0GSF)_ using computer programs and Smith charts to achieve optimal dimensions. It provides specific guidance on calculating and adjusting the lengths of the radiators (L1) and the matching ladder line (L2), emphasizing the critical role of velocity factor (VF) in achieving resonance. The article includes a step-by-step procedure for empirically determining the VF of ladder line using an antenna analyzer, ensuring accurate physical lengths for the matching section. It details the tuning process for the radiators, offering practical tips for incremental adjustments to achieve the best SWR curve. The resource presents SWR measurement results obtained with an _AIM-4170C_ analyzer across multiple bands, alongside predicted SWR graphs from an AutoEZ model. It confirms successful contacts on 80, 40, 20, and 17 meters, including a **17-meter DX contact** to Italy. EZNEC and AutoEZ models for the ZS6BKW antenna, covering 80 through 6 meters, are provided for download, allowing further analysis and customization. The document specifies component details, such as the use of Wireman 554 ladder line and #14 AWG THHN copper wire, and discusses the antenna's performance characteristics, noting high SWR on 15 and 30 meters but successful tuning on 6 and 80 meters with an external tuner. -
A comparison of multiband dipoles, including jumpered dipole versus fan dipole antennas, dipole fed by ladder line, resonant dipoles antennas. ARRL lab notes -
The RasHAWK team has used a Raspberry Pi as the basis for a networked RF sensor capable of supporting spectrum monitoring, signal intercept and direction finding (DF) operations. -
A project for a 50 MHz moxon rectangle antenna -
In this PDF article Zack Lau describe how to homebrew a four element yagi beam antenna for 50 MHz band, including how to build mounting blocks and tubing clamps to hold elements. -
Why all the mystery surrounding baluns ? To use or not to use baluns -
The Packet Radio beginners guide to packet radio operating by Buck Rogers K4ABT -
A bycicle ham radio station setup, with full band coverage -
Program which will allow you easy migration from logPlus to another logging software. Tested with Logger by K4CY so let me know it you have problem ADIF import to other software. -
This project produces a sturdy tripod for small vertical antenna support using readily available electrical metal tubing (EMT) or conduit -
Telecom Product Profiles is a manufacturers' rep firm specializing in factory direct Nello Towers, monopoles, antenna mounts, shelters, and more. Factory direct Cellular, PCS, and Wireless Broadband equipment such as antennas, radios, and more. Installation, financing, and leasing options available. -
A trap on the coaxial cable, also known as choke, helps to eliminate the sneaking of the reflected RF- energy to the shack. The trap can be made from the coaxial cable that feeds the antenna -
After you have build this antenna, you may not need anything else. This article shows how to build a VHF j-pole antenna and how to protect it by inserting it into a PVC tube, the correct way. -
This database is not a logging program. It is intended to collect information about the HAMs that you know. You just record the call sign and name of a HAM that you meet. Later you can use QRZ to look up the call sign to validate that it matches the name. -
In this article the author describes some new designs of ferrite loaded chokes for suppressing unwanted common mode currents at HF applied to feed lines like choke baluns, but also in the shack, applied to various coaxial, mains and data cables -
Technical supplement with schematics of the Yaesu FT-2800M Yaesu Transceiver -
Butternut article on radials usage on vertical and ground plane antennas -
A presentation of a HF multi-band sloper antenna. This antenna project is for low band operations, and antenna presented in this article works on 40 80 and 160 meters band. Article is in Polish. -
Schematic diagram of the VLA 200 power amplifier by RM Italy -
VHF Power amplifier VLA 200 english manual -
Limiting static surges on dipoles, verticals or end fed antennas -
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Over 100 amateur radio beacon audio files are presented, offering a direct auditory experience of propagation conditions across a wide spectrum of frequencies, from 1.8 MHz to 47 GHz. These recordings, primarily captured by IW3FZQ and IK3NWX, document signals from beacons such as DK0WCY, IY4M, GB3RAL, and S55ZRS, providing a valuable resource for **propagation study** and **beacon monitoring**. Each entry in the list specifies the beacon's callsign, its operating frequency in kHz, and the recording operator. This compilation includes signals from beacons located in various grid squares like JN55VF, JO44VQ, and IO91IN, illustrating diverse geographical origins. The frequencies covered span the 160m, 80m, 40m, 30m, 20m, 17m, 15m, 12m, 10m, 6m, 4m, 2m, 70cm, 23cm, 6cm, 3cm, 1.2cm, and 6mm amateur bands. Users can listen to these recordings to identify characteristic beacon tones and observe signal strength variations. The resource also invites other radio amateurs to contribute their own beacon audio files, fostering a collaborative archive of propagation data. The last update to this collection was on March 24, 2009, indicating a historical snapshot of beacon activity. Accessing the files requires the Real Player software. -
The MEL PICBASIC Forum serves as a community hub for users of Micro Engineering Labs PICBASIC compilers, facilitating discussions related to PIC microcontroller programming. It features dedicated sections for various compiler versions, including mel PIC BASIC, mel PIC BASIC Pro, and PBP3, each containing numerous threads and posts detailing specific programming challenges and solutions. The forum also provides areas for frequently asked questions, general PIC BASIC discussions, and commercial assistance requests. Specific sub-forums address advanced topics such as PBP Extensions, Code Examples, and AI and PICBASIC, offering insights into extending compiler functionality and integrating artificial intelligence concepts. Furthermore, the platform includes sections for Data Communications, covering USB, I2C, 1-Wire, GSM, and serial communications, which are critical for interfacing PIC microcontrollers with external devices. A dedicated area for PIC Programmers allows for discussions on programming hardware and techniques. The forum's utility is enhanced by its extensive archives of user-contributed solutions and examples, which can assist hams in developing microcontroller-based projects for radio applications. The platform's structure supports knowledge exchange among hobbyists and professionals working with PIC microcontrollers. -
Designing and constructing portable wire antennas for HF operations, this resource explores several configurations including the _foldback dipole_ for space-constrained setups and an inductively shortened dual-band dipole for 20m and 40m. It details the calculation of inductance for shortened elements, providing a Visual Basic 6.0 program screenshot that illustrates determining coil parameters like turns and length for a **25.5 uH** inductor. The document emphasizes practical considerations such as adjusting wire lengths for optimal SWR, noting that a dual-band dipole achieved SWR below 2:1 on both 20m and 40m, with careful adjustment bringing it under 1.5:1. Further, the resource describes a half-wave antenna matched with a coaxial stub, a method often referred to as the _Fuchskreis_ in German amateur radio circles, to transform the high feedpoint impedance to 50 Ohms. This monoband solution, for a 20m application, uses a stub length of **2.98m** (0.216 lambda multiplied by coax velocity factor) and a shorted stub of approximately 48cm. The coaxial stub design is highlighted for its resilience to ground proximity, allowing it to be rolled up or laid on the ground with minimal SWR impact, making it highly suitable for portable QRP operations. -
Download the Yaesu VX-8R Cheat Sheet PDF File -
Sometimes we need a little more output filtering than traditional designs offer. Look at a new filter that can give you that extra boost. QST article by W3NQN -
My Top Five Backyard Multi-Band Wire HF Antennas. A selection of the top 5 HF wire antennas for the backyard and for multi-band operation -
Photo construction manual of a portable antenna made with two heavy duty whips by buddipole. In this article has been implemented a 50 MHz portable dipole. -
Tips on winding wire coils used as inductive loads, traps, band-pass filters, are implemented in a number of amateur radio projects especially antenna projects