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Antennas : 20M : 20 meter Vertical Antennas- 4m Tall Vertical Dipole for 20m
- Constructed in May 2008, this innovative 4m tall electrically full-size halfwave vertical dipole, tunable to multiple bands, offers HF coverage despite its space-saving design. Inspired by cost-effective DIY alternatives, the antenna design departs from conventional center-fed approaches, utilizing asymmetrical dimensions. Despite resonance challenges, the antenna's performance remains viable, boasting broad bandwidth and adaptability, as demonstrated through SWR measurements and EZNEC predictions.
[ Hits: 65 | Votes: 0 | Rating: 0 ]
- Mastering Magnetic Loop Antenna Control
- Unveil the secrets of efficient Magnetic Loop Antenna control systems, eliminating the hassle of frequent retuning. With real-time tracking and compatibility with various transceivers, including popular models from Elecraft, ICOM, Kenwood, and Yaesu, this controller ensures seamless frequency adjustment. Explore its high-resolution stepper motor and versatile communication capabilities, revolutionizing amateur radio operation.
[ Hits: 54 | Votes: 0 | Rating: 0 ]
- Automatic Magnetic Antenna Tuner
- A Magnetic Loop Antenna is a resonant circuit employing a large inductor and adjustable capacitor. Efficiency depends on the inductor's size relative to wavelength. A Magnetic Loop Controller adjusts antenna tuning in real-time, syncing with Transceiver VFO movements. It communicates with various radios, enabling seamless tuning. Stepper motor resolution ensures accurate capacitor positioning, crucial for antenna performance. The Controller's firmware offers diverse functionality, enhancing user experience and antenna efficiency.
[ Hits: 58 | Votes: 0 | Rating: 0 ]
- Tuning OCF L-Dipoles
- The behavior of a straight dipole and its L-form is examined in terms of impedance and SWR. By adjusting the feed point or bending angle, impedance variation is observed. Impedance shifts symmetrically as the feed point deviates, leading to recommendations for optimal ratios. Model simulations aid in understanding and fine-tuning, crucial for achieving a 50 Ohm match. Practical tuning guidelines ensure efficient antenna performance.
[ Hits: 28 | Votes: 0 | Rating: 0 ]
- Portable Half-Square Antenna:
- The author explores a portable version of the half-square antenna, typically a single-band structure. Using a 9:1 unun for versatility, they describe construction with speaker wire, deployment using collapsible poles, and field tests, achieving successful contacts on multiple bands. The article suggests efficient matching methods and concludes with the antenna's integration into the author's portable options.
[ Hits: 120 | Votes: 0 | Rating: 0 ]
- H40WA Log Online
- H40WA online log seatch and OQRS by M0URX
[ Hits: 92 | Votes: 0 | Rating: 0 ]
- FISTS Log Converter
- FISTS Log Converter simplifies various tasks for amateur radio operators. It aids in tracking FISTS Awards, submitting applications, and creating logs for FISTS Activities in Europe like the Ladder and EuCW Snakes & Ladders. Users can generate callsign checklists and import logs from existing logging programs via ADIF files. Available as freeware, it runs on Windows 2000 and later versions
[ Hits: 19 | Votes: 0 | Rating: 0 ]
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