antenna stand

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antenna stand

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Antennas : 2M
  • Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
    [ Hits: 353 | Votes: 0 | Rating: 0 ]
Antennas : 6M : 6 meter Yagi Antennas
  • 6 Elements Yagi Antenna on 50 MHz - This is a design based on the QuickYagi 4 software by WA7RAI with some changes for practical reasons. The beam uses 6.5 metres of standard 25mm square boom, 12mm diameter elements without tapers. The actual boom length used is 6.3 metres and all parts are readily available.
    [ Hits: 131 | Votes: 2 | Rating: 6 ]
Antennas : Antenna Calculators
  • Wire Antenna Calculator - A javascript online calculator for popular wire antennas, from the standard easy to build flat-top dipole, to the inverted V dipole, but also the Quad Loop, and the equilateral delta loop antenna
    [ Hits: 1387 | Votes: 14 | Rating: 7.75 ]
Antennas : Dipole
  • Folded dipole antennas: terminated vs un-terminated - As the name suggests, it is simply a dipole with the tips folded towards each other. In this case, a full-wave dipole. The span of a standard folded dipole is aprox 0,5 lambda. In this article the author investigate on differences between un-terminated vs terminated folded dipole antennas.
    [ Hits: 493 | Votes: 9 | Rating: 6.78 ]
  • The Standard Horizontal Dipole Characteristics - Discussion about the Standard Horizontal, Center-fed dipole and effects of elevation of the antenna on antenna radiation pattern.
    [ Hits: 126 | Votes: 0 | Rating: 0 ]
Antennas : Magnetic Loop
  • Coca Cola Loop Antenna - The Coke Loop is a Small Magnetic Loop Antenna tuned by a trombone-style variable capacitor made with standard soda cans
    [ Hits: 2644 | Votes: 9 | Rating: 6.33 ]
Antennas : Portable
  • Portable Field Antenna Kit - A simple kit for temporary, lightweight, wire tactical antenna systems is essential for any field Ops. Described in this article a kit as it fits in a standard US Military M-1956 Butt Pack
    [ Hits: 542 | Votes: 1 | Rating: 10 ]
Antennas : Shortwave
  • Shortwave Antennas - Introduction to Shortwave Antennas. Understanding Shortwave Radio Listening and Antenna Design and Construction
    [ Hits: 723 | Votes: 1 | Rating: 10 ]
Antennas : Theory
  • L.B. Cebik - W4RNL documents by ON5AU - A collection of antenna projects by W4RNL L.B. Cebik collected in a single link page by ON5AU. Includes ARRL QST, Modeling and Understanding Small Beams and books
    [ Hits: 431 | Votes: 3 | Rating: 10 ]
  • Ground Systems as a Factor in Antenna Efficiency - A classic document originally presented in Proceedings of the Institute of Radio Engineers in 1937 and is, still today, the standard referenced by the FCC, text books and many amateur radio publications.
    [ Hits: 393 | Votes: 1 | Rating: 1 ]
  • Understanding Antenna Polarization - What is antenna polarization, and why does it matter. Horizontal versus Vertical versus Circular polarization. Undestanding how antennas perform better with different polarizations.
    [ Hits: 169 | Votes: 1 | Rating: 2 ]
Antennas : Theory : Impedance matching
  • The Gamma Match - The gamma match was originally invented as a means of feeding vertical monopole antennas for medium wave broadcasts, which were earthed at the base for lightning protection- Hams are more likely to use a gamma match to feed a dipole or loop element, but the basic theory is easier to understand for the case of a quarter wave monopole.
    [ Hits: 954 | Votes: 2 | Rating: 4.5 ]
Antennas : Traps
  • Tuning Antenna Traps - Tuning Antenna Traps without a Grid Dip Oscillator, using a bit of initiative and some standard equipment a ham should have in the shack.
    [ Hits: 911 | Votes: 1 | Rating: 9 ]
Operating Modes : NVIS
  • NVIS: Near Vertical Incidence Skywave - Operating NVIS mode, understanding operation frequencies, choosing the proper antenna to operate with the Near Vertical Incidence Skywave propagation
    [ Hits: 383 | Votes: 6 | Rating: 5.58 ]
Radio Equipment : Antenna Analyzers
  • How to choose an antenna analyzer - An article and buyers guide about antenna anlyzers, undestanding differences among popular RF analyzers in the market
    [ Hits: 543 | Votes: 1 | Rating: 4 ]
Radio Equipment : HF Vertical Antenna
  • Challenger DX Antenna Review by NK7Z - A review of the GAP Challenger DX Antenna that is not a traditional 1/4 wave vertical, but is a vertical dipole, this gives it several advantages over a standard 1/4 wave vertical, mainly the reduced number of radials, with excellent performances.
    [ Hits: 220 | Votes: 2 | Rating: 10 ]
Radio Equipment : HF Vertical Antenna : GAP Titan
  • W9GF GAP TITAN DX Antenna Installation - An unusual Titan DX antenna seutp, done without the standard counterpoise. This document is not an official manual, but rather a personal note to record the antenna setup with the custom wire counterpoise.
    [ Hits: 471 | Votes: 2 | Rating: 9 ]
Technical Reference : 3D Printed Projects
  • Yeggi 3D printable Models for Ham Radio - Yeggi search engine results for amateur radio 3d printable models. If you are looking for 3d ham radio parts like loading coils, stands for radio, cases, antenna insulators and antenna supports here you will find many ready to use 3d models
    [ Hits: 255 | Votes: 0 | Rating: 0 ]
Technical Reference : SWR Meters
  • SWR and Amateur Radio Antenna Tuners - Undestanding and measuring SWR, Standing Wave Ratio in antenna feed lines. This article also introduce basic concepts and usage guidelines of amateur radio antenna tuners
    [ Hits: 218 | Votes: 2 | Rating: 9.5 ]
  • WiFI vSWR Meter - When building antennas for the Wifi band (Like the 8dBi omni), a need for an easy way to check the antennas arose. A Voltage Standing Wave Ratio (VSWR) meter useable at the 2.4GHz band is however, hard to find.
    [ Hits: 130 | Votes: 2 | Rating: 3.5 ]

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