rf ground

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rf ground

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Antennas : 30M
  • Shortened 30m Dipole - This article describes the construction of a 9,50 m long dipole for the 30 m band (10.1 MHz to 10.15 MHz). It was designed to be mounted ca. 6 m above ground inside an attic. The calculations were performed by OE1MEW
    [ Hits: 122 | Votes: 1 | Rating: 1 ]
Antennas : End-Fed
  • TEFV Terminated End Fed Vee Antenna - The Terminated End Fed Vee Antenna (TEFV) is a travelling wave antenna with constant current distribution. Unlike traditional resonant antennas, TEFV operates without standing waves, using a terminating resistor for broadband efficiency. With a combination of vertical and horizontal polarization, it offers wide bandwidth from 1.8 MHz to 30 MHz, eliminating the need for a tuner. Key components include a 9:1 unun transformer and a 500-ohm terminating resistor. Grounding and counterpoise enhance performance, and it can handle power losses of up to 30%. TEFV provides an effective, versatile antenna solution for amateur radio and broadcast applications.
    [ Hits: 183 | Votes: 2 | Rating: 6.5 ]
Antennas : Multiband
  • Space-Efficient Excellence: Inverted L Multi-Band HF Antenna - Discovering a solution for limited space, the inverted L HF antenna emerges as a stellar performer. Half the size of a dipole, it ensures optimal installation in restricted areas, maintaining superb transmission (TX) and reception (RX) characteristics. Spectrum Communications' multi-band version, featuring traps, proves even more space-friendly without compromising performance. A fiberglass pole offers sturdy support, while proper grounding, an RF choke, and occasional tuning contribute to a high-performing and reliable antenna system.
    [ Hits: 165 | Votes: 0 | Rating: 0 ]
Antennas : Rhombic
  • K0UO Rhombix Antenna Farm The Ground - Modeling an antenna over real terrain gives you a visual picture of how terrain impacts performance. You can use a model to determine optimum height for antennas on an existing tower, Compare different tower locations for performance, Compare different sites for performance
    [ Hits: 143 | Votes: 1 | Rating: 10 ]
Antennas : Theory
  • Variations on a Dipole - Antenna patterns are all about interference. Presentation on wire antennas for HF bands. Dipoles, horizontal and vertical dipoles, effects of ground on radiation patterns, multi-band wires antennas. Knowing what you should expect from the radiation patterns for waves on your wires will help you choose what will work best for your needs. The principles of interference can lend insight into what to expect from a wire antenna.
    [ Hits: 98 | Votes: 0 | Rating: 0 ]
Antennas : Tuners
  • Budget-Friendly QRP T-Tuner and SWR Bridge - In the pursuit of an affordable matching and SWR indication solution for the Pixie-based transceiver system this T-Tuner and SWR bridge unit, while not groundbreaking, proves to be a cost-effective performer. With real-world impedance testing yielding a worst-case loss below 0.9 dB, the unit efficiently matches all bands on 80 M to 10 M ham bands, making it a valuable addition to the QRP system.
    [ Hits: 49 | Votes: 0 | Rating: 0 ]
Antennas : Wire
  • Wire on the Ground: Portable Radio Success with Grasswire Antenna - The author shares a unique experiment with a 200ft Grasswire antenna—laying wire directly on the ground. Despite inherent losses, the setup enables successful radio communication with a Kentucky station, highlighting the antenna's practicality for portable use with minimal power.
    [ Hits: 97 | Votes: 0 | Rating: 0 ]
Technical Reference : RF Safety
  • RF Exposure Calculator - To use the RF Exposure Calculator, fill-in the form with your operating power, antenna gain, and the operating frequency. Depending on how far above ground the RF source is located, you might want to consider ground reflections too.
    [ Hits: 100 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • Stop RFI from Solar PV Systems - Stop EMI RFI Interference in Off Grid Solar PV Systems, in this article the author provides hints on tracking down the EMI or RFI source, shielding and grounding in order to eliminate interferences on the whole HF and VHF ham radio bands
    [ Hits: 80 | Votes: 0 | Rating: 0 ]
Technical Reference : Sound Card Radio Interfacing
  • Digital Mode Interface - The use of an isolation interface between the radio and the pc is higly recommended,in order to avoid the problems that could be caused from ground loops. This project includes schematic and assembly instructions
    [ Hits: 174 | Votes: 0 | Rating: 0 ]

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