Search results

Query: Antennas
Links: 655  |  Categories: 154
This query is too generic. Please try adding an additional term to focus your research.
Categories
  • Add Panadapter to Yeasu FT-DX1200
    No votes
    Technical Reference > Pan Adapter
    Add Panadapter to Yeasu FT-DX1200 — ON8IM
    A simple realization of a panadapter conntected to a custom build IF PanAdapter output added to the Yeasu FT-DX1200. The IF output has been provided by adding a G4HUP PAT board to the transceiver.
  • An Overview of Beverage Receiving Antennas
    No votes
    Antennas > Beverage
    An Overview of Beverage Receiving Antennas — N0AX
    This article explores Beverage antennas, a type used for low-frequency radio reception. Despite the mystique, they are relatively simple wire antennas placed near the ground. Their key benefit is improved signal-to-noise ratio by rejecting unwanted signals. While lengthier antennas offer better reception, even shorter versions (around 200 feet) can improve DX reception compared to traditional antennas.
  • Practical Design of Very High Gain Yagi Arrays
    No votes
    Antennas > Theory
    Practical Design of Very High Gain Yagi Arrays — SM5BSZ
    This paper by Leif Asbrink (SM 5 BSZ) presents a practical approach to designing very high gain Yagi antennas, focusing on the "brute force" optimization method. The method, described in a previous article, ensures convergence independent of initial guesses. The paper provides detailed tables of element lengths and positions for Yagi antennas optimized for 144.1 MHz with a 50-ohm feed point impedance, aiming for minimal losses and high accuracy in comparisons.
  • Beverage Transformers for HF Receiving Antennas
    No votes
    Antennas > Beverage
    Beverage Transformers for HF Receiving Antennas — KK5JY
    This FAQ covers building and buying transformers for loop-on-ground and Beverage antennas. Building one uses ferrite cores and thin wire. Buying is an option, with the DX Engineering BFS-1 being recommended. These transformers isolate the antenna from the cable to prevent unwanted signal pickup.
  • Coax Velocity Factor in Baluns
    No votes
    Antennas > Baluns
    Coax Velocity Factor in Baluns — John S. Huggins
    This article explores the role of velocity factor (VF) in calculating stub lengths for VHF/UHF Baluns. It clarifies misconceptions about VF's relevance, distinguishing between coaxial cable interior fields and external stub fields. Practical examples, such as the Pawsey Stub and Coaxial Cable Balun, are analyzed alongside experimental findings. The results reveal that traditional VF adjustments are unnecessary for stubs with external fields but critical for internal coaxial applications. Historical and theoretical insights provide a comprehensive perspective for antenna enthusiasts and designers.