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Antennas : Feed Lines

  • Feed Line Currents for Neophytes - This paper discusses the sources of feed line currents and the methods used to control them.
    [ Hits: 340 | Votes: 0 | Rating: 0 ]
Antennas : Theory
  • Crossed Field Antenna - The Crossed Field Antenna (CFA) is one of the applications of Correction of Maxwell's Equations which was used over 150 years ago which was proved these days that the Magnetic Field Source is only the Displacement Current not the Conduction Current . These Corrections was made by an Egyptian Doctor Engineer Fathi Kabbary , who reached the New Correct Theory which shows that the height and efficiency of the antenna doesn't depend on the wavelength
    [ Hits: 2306 | Votes: 5 | Rating: 2.8 ]
DX Resources : Ham Radio Awards
  • BOTA Beaches on the Air - Beaches On The Air is an award scheme for radio amateurs that encourages portable operation from beaches. You can participate from any country or region around the world. Our beach lists currently contain more than 30,000 beaches and aim to be as exhaustive and objective as possible, and are often based on official sources, such as environmental protection agencies.
    [ Hits: 143 | Votes: 1 | Rating: 10 ]
DX Resources : Newsletters
  • DXNL DX Newsletter - The DARC DX Newsletter (aka DX-Mitteilungsblatt) is an important source of information for the active DXer. It is published on a weekly basis in German and English and keeps the readers up to date about current and planned DX activities.
    [ Hits: 636 | Votes: 3 | Rating: 8 ]
Ham Radio : Exams : Exam Practice
  • ARRL Exam Review for Ham Radio - 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.
    [ Hits: 66 | Votes: 0 | Rating: 0 ]
Manufacturers : Antenna Parts
  • Radioworks - Source for high performance wire antennas, Current-type Baluns, Line Isolators, quality wire antenna parts and accessories.
    [ Hits: 6239 | Votes: 5 | Rating: 5.8 ]
Manufacturers : Software Defined Radio
  • Apache Labs - The ANAN series SDRs are based on the OpenHPSDR open source designs, these are 4th generation radios and represent the state-of-the-art in current Amateur radio SDR design.
    [ Hits: 666 | Votes: 3 | Rating: 9.33 ]
Operating Modes : Digital Modes
  • OpenRTX - OpenRTX is a free and open source firmware for digital ham radios. The firmware is designed with a top-down approach with the objectives of modularity, flexibility and high performance. Currently, it targets some Tytera Radioddity Baofeng digital radios
    [ Hits: 78 | Votes: 0 | Rating: 0 ]
Operating Modes : JT65
  • JT65-HF Project by W6CQZ - W6CQZ JT65-HF project on sourceforge, the Amateur Radio software for reception/transmission of JT65A protocol with an emphasis upon its usage in the High Frequency Amateur Bands. Project is currently paused.
    [ Hits: 535 | Votes: 1 | Rating: 6 ]
Propagation : MUF Indicators
  • HamDXMap - This dynamic DX Map aggregates various resources that will help radio amateurs to operate their stations in search of long distance contacts, DX. HamDXMap displays current MUF values and foF2 critical frequency values around the globe.
    [ Hits: 385 | Votes: 9 | Rating: 9.22 ]
Propagation : Resources
  • WM7D Solar Resources - Solar Flux reports, Current Alerts and Warnings from NOAA, 27 day forcast from NOAA, charts reflecting the past 7 years Solar cycle summary charts from NOAA
    [ Hits: 5706 | Votes: 17 | Rating: 8.7 ]
Shopping and Services : Regional : USA
  • Columbia Electronics International, Inc. - Military radio sets for land, sea or air from new current production, unused or rebuilt u. s. military surplus and their accessories and spare parts since 1946 your reliable one stop source.
    [ Hits: 523 | Votes: 0 | Rating: 0 ]
Software : Circuit Design
  • Thevenin equivalent calculator - The Thevenin equivalent simplifies a complex circuit into an equivalent circuit with a voltage source and resistor for easy analysis of voltage and current at any point in the circuit. Use this online Thevenin calculator
    [ Hits: 53 | Votes: 0 | Rating: 0 ]
Software : Internet Linking
  • CQiNet, linking Ham Radio - CQiNet is a family of programs that combine Ham Radio with the Internet using Voice over IP (VoIP) technology. Two programs are currently in the family, "theBridge" and echoLinux. Thebridge is a iLink/EchoLink compatable conference bridge that runs under various versions of Unix as well as Windows. EchoLinux is a EchoLink client program for the Linux operating system.
    [ Hits: 3660 | Votes: 4 | Rating: 7.5 ]
  • 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 ]
Software : Linux
  • LinPac packet radio terminal - Linpac is an extensible Linux packet terminal that supports easy access to concurrent connections (streams), PBBS/FBB forwarding, and support for adding external commands
    [ Hits: 1869 | Votes: 2 | Rating: 10 ]
Software : Logging
  • HAM-LCT - Freeware logbook program with many features, includes CAT system and database for yaesu Icom and kenwood rtx. This program is currently discontinued by the author who developed another ham log program for windows.
    [ Hits: 7121 | Votes: 4 | Rating: 6 ]
Technical Reference : Batteries : Battery Charger
  • 12v Battery Charger - Well, firstly the 12 Volt source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current and voltage, which cannot result from connecting it directly to a voltage source.
    [ Hits: 80 | Votes: 1 | Rating: 10 ]
Technical Reference : Radio Frequency Interference
  • Prevention and Suppression of RF Interference to Audio Systems  new - 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.
    [ Hits: 42 | Votes: 0 | Rating: 0 ]

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