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225 links - and 3 categories

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Antennas : End-Fed : End Fed Half Wave Antenna

• End-Fed Half-Wave Antenna for 20m 40m 80m - How to Design and Build a Field Expedient End-Fed Half-Wave Antenna for 20m, 40m and 80m. This Shorty 80m EFHW comprises a 49:1 autotransformer (to match the very high impedance at the end of a half-wave wire), a half-wavelength wire for 40m (also a quarter-wavelength for 80m), a loading coil and a short tail wire. The coil and the short tail wire (about 6 feet) make up the other quarter wave on 80m.
  [ Hits: 141 | Votes: 1 | Rating: 4 ]

Antennas : Stealth

• A simple Attic Antenna for HF bands - This simple antenna was installed on the attic. Antenna was matched with help an Automatic ATU in 40, 30, 20, 17, 15, 12 and 10 meter amateur Bands. The Antenna worked satisfactory on the above mentioned bands.
  [ Hits: 316 | Votes: 7 | Rating: 6 ]

Antennas : Wire

• The Squid Pole Wire Antenna Re-visited - The author explores enhancing the performance of a 7-meter fiberglass squid pole wire antenna for amateur radio. The wire, resonant at 10MHz, poses impedance challenges on various bands. Experimenting with direct coax feed and UN-UN transformers, the LDG Z11-Pro2 auto-tuner is found effective but may show deceptive SWR readings. The author employs adjustable UN-UN ratios and introduces a custom "porcupine" coil to optimize the antenna's efficiency.
  [ Hits: 91 | Votes: 0 | Rating: 0 ]

DX Resources : DX Maps

• HF DXView Propagation Map - This map shows real-time radio propagation from stations operating on 11 bands between 1.8 and 54 MHz in the amateur radio service. The display shows world-wide activity from the last 15 minutes and is automatically updated about every minute. Data for the map is gathered from several online sources: WSPRnet, Reverse Beacon Network (CW, FT4, FT8), PskReporter, and DX Cluster.
  [ Hits: 302 | Votes: 5 | Rating: 7.6 ]

Operating Modes : Aircraft scatter

• Virtual Radar from a Digital TV Dongle - Track aircraft by reprogramming an inexpensive digital TV USB stick to receive Automatic Dependent Surveillance-Broadcast signals.
  [ Hits: 136 | Votes: 1 | Rating: 2 ]

Operating Modes : Satellites : Weather Satellite

• Receiving NOAA Weather Satellite Images - Receiving NOAA weather satellite images using a Raspberry PI with a RTL dongle and a Turnstile crossed dipole automatically.
  [ Hits: 112 | Votes: 0 | Rating: 0 ]

Propagation : Resources

• VHF APRS Propagation Map - VHF – Based on realtime APRS reports. This map shows real-time radio propagation from stations operated near 144 MHz. It uses data gathered by Automatic Packet Reporting System-Internet Service (APRS-IS) from packet stations in the amateur radio service. The map shows activity from the past hour. Paths are smoothed to create a color-coded footprint indicating the distance VHF signals are likely to be traveling.
  [ Hits: 315 | Votes: 0 | Rating: 0 ]

Radio Equipment : HF Transceivers : Yaesu FT-817

• FT-817 Cheat Sheet - A simplified operating guide for the Yaesu FT-817
  [ Hits: 157 | Votes: 0 | Rating: 0 ]

Radio Equipment : HF Transceivers : Yaesu FT-950

• Yaesu FT-950 CAT Manual - The CAT (Computer Aided Transceiver) System in the FT-950 transceiver provides control of frequency, VFO, memory, and other settings such as dual-channel memo- ries and diversity reception using an external personal computer. This allows multiple control operations to be fully automated as single mouse clicks or keystroke op- erations on the computer keyboard.
  [ Hits: 58 | Votes: 0 | Rating: 0 ]

Software : Internet Linking

• 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 : Weak Signal

• WSJT-X Controller - Streamlining FT8 Operations with Automation. The WSJT-X Controller simplifies FT8 operations by automating repetitive tasks in conjunction with WSJT-X. Designed to enhance efficiency, it facilitates tasks like responding to CQs, managing late 73 decodes, and seamlessly integrating with JTAlert and other add-ons. The program allows users to focus on productive QSO tasks while optimizing FT8 performance.
  [ Hits: 136 | Votes: 1 | Rating: 9 ]

Technical Reference : Antenna Switch

• Fully automatic antenna switch project - Cheap and simple fully automatic antenna switching that permit to automatically select the proper antenna based on transceiver status activity.
  [ Hits: 86 | Votes: 0 | Rating: 0 ]
• Smart SO2R Antenna Switcher: A DIY Solution - In pursuit of enhanced station efficiency, the author describes crafting an Arduino-based smart antenna switcher for an SO2R setup. Faced with manual antenna switching challenges during contests, the project utilizes a Logos Electromechanical 4x4 Driver Shield and a Power Screw shield for seamless functionality. Despite its raw appearance, the automatic switcher proves indispensable in contest scenarios, prompting considerations for future improvements and standardization of station control protocols.
  [ Hits: 152 | Votes: 0 | Rating: 0 ]

Technical Reference : Arduino

• Automatic antenna switch with Arduino Nano - Arduino Nano board based antenna coax antenna switch intended for use with ICOM CI-V protocol. When is used alone with transceiver without PC control (CAT software, any logging software with CAT functionality), the CI-V transceive option in TRX setup shall be set to ON.
  [ Hits: 141 | Votes: 1 | Rating: 9 ]
• WIFI Remote FUCHS ATU for EndFed Antenna - The Fuchs Antenna tuner with a resonant circuit as a coupler. The Fuch Antenna Tuner is providing a high-efficiency compare to a 49:1 transformer using ferrite . The Fuchs tuner is a resonating L/C circuit to step-up the impedance from 50 Ohm to the required 3k. The ATU is able to perform automatic tuning with the addition of a tiny Aduino Nano and a SWR bridge.
  [ Hits: 116 | Votes: 0 | Rating: 0 ]
• Band Decoder Arduino - 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.
  [ Hits: 62 | Votes: 0 | Rating: 0 ]

Technical Reference : Ham Radio Go Kits

• Yaesu FT-891 Go-Box for POTA - This article documents the author's latest go-box build for outdoor ham radio operations using a Yaesu FT-891 transceiver. The go-box is constructed from a plastic "50-cal ammo case" and contains various components, including the transceiver, LDG Z11 Pro autotuner, DIY Yaesu FH-2 remote control keypad, and an external battery. The author details the design considerations, the mounting of components inside the box, and addresses issues related to ventilation and cable management. The go-box is geared for CW operations and POTA activations, with further modifications planned for a microphone and DATA jack. This project allows for rugged, environmentally protected outdoor radio operations while maintaining portability.
  [ Hits: 196 | Votes: 0 | Rating: 0 ]

Technical Reference : Keyers

• Remote Morse Keyer - SW Keyer for remote operations. This is a simple tool based on the Morse Code Iambic and Semi-Automatic Keyer from the Morse-Code-Tools projects. You can use your key, bug or Iambic Paddle stright connected to your personal computer without a hardware morse keyer.
  [ Hits: 99 | Votes: 0 | Rating: 0 ]

Technical Reference : Raspberry Pi

• Mini Satellite-Antenna Rotator Mk1 - This project is a portable device used to automatically point a directional antenna towards an orbiting satellite. It takes all the effort out of little kids holding the antenna and figuring out where to point it. It allows students to talk through Amateur Radio satellites or download weather satellite images. Note: This is a complex DIY project for the advanced kit constructor.
  [ Hits: 287 | Votes: 1 | Rating: 1 ]

Technical Reference : Repeater

• Automated Voice announcements over RF - Automated voice announcements project built to have an automated way to deliver club announcements via the repeater network.
  [ Hits: 63 | Votes: 1 | Rating: 10 ]

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