directional antennas

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directional antennas

40 links - and 1 categories

Antennas : 2M
  • 2m Big Wheel Antenna - A Useful Horizontally Polarised Omni-directional Antenna with Gain for 144 MHz
    [ Hits: 1320 | Votes: 4 | Rating: 7.75 ]
  • VHF Bi-Square Beam Antenna - 2 Wavelength ,2 Meter Bi-Square Beam , 5dbd gain. This antennas are very cheeap to build and their radiation pattern is similar to a figure 8 with maximum signal through the loop but they may be used as a near-omnidirectional antenna
    [ Hits: 185 | Votes: 2 | Rating: 9 ]
  • Two elements Telescopic Yagi for 2 Meters - A lightweight PVC hand-held telescopic 2 element 2m (145 MHz) yagi using two pairs of TV rabbit ear antennas as the driven and reflector elements. Approximate directional gain is 5dB.
    [ Hits: 161 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Vertical Antennas
  • Vertical bazooka antenna for the 40m  new - A quarter wave vertical omni-directional antenna for 7 MHz. Formulas for dimensions in feet and meters are provided. Ideal radial angle is between 35° and 45°. Velocity factor (Vf) varies based on coax type.
    [ Hits: 129 | Votes: 7 | Rating: 6.85 ]
Antennas : Array
  • 160m-6m Directional Array - Evolution of a Stealth 19 and 22 element directional antenna array system for 160m to 6m
    [ Hits: 2250 | Votes: 9 | Rating: 6.87 ]
Antennas : Beverage
  • W0BTU Beverage Receiving Antenna notes - Comprehensive information page about bi-directional Beverages, including applications, construction details, and tips.
    [ Hits: 1153 | Votes: 39 | Rating: 9.49 ]
  • The Wave Antenna for 200-Meter Reception - A QST Article published in November 1922 is about the origin of Beverage antennas, an unidirectional antenna type that was discovered and experimented for the first time in that period. This article is the introduction to beverage antenna theory, by the homonimous autho H. H. Beverage.
    [ Hits: 203 | Votes: 0 | Rating: 0 ]
  • About The Beverage Antennas - Receiving Antennas - An article about the Beverage antennas, super long wire receiving antennas thar are unidirectional and have a very low noise that makes this antenna excellent for low band dxing. By Thomas R. Sundstrom W2XQ, 73, June 1981, 73 Magazine
    [ Hits: 185 | Votes: 1 | Rating: 10 ]
  • Reversible RG6 Beverage Antenna - A project about reversible unidirectional Beverage antennas plus a remote switching system conveniently controlled by the operator
    [ Hits: 182 | Votes: 3 | Rating: 7 ]
Antennas : Delta loop
  • Delta loops for 15 20 and 30 m - Full Wave Delta Loops for 15, 20 and 30m with perimiter dipole, quiet, low TOA, mono-band - a perfect stealth omnidirectional solution
    [ Hits: 3862 | Votes: 3 | Rating: 1 ]
Antennas : HB9CV
  • HB9CV antenna calculator - Calculate dimension for HB9CV directional antennas
    [ Hits: 3309 | Votes: 71 | Rating: 4.33 ]
Antennas : J-Pole
  • Exploring The J-Pole Antenna - The J-Pole antenna is a common omnidirectional antenna used in amateur radio, particularly on the VHF and UHF bands. This article is an attempt to explore how the J-pole antenna transforms feed-line impedance to free-space impedance, all the while providing gain found only in the more expensive commercial products.
    [ Hits: 142 | Votes: 0 | Rating: 0 ]
  • Construction of a J-Pole antenna for 2 meter - If you like building good antennas, this one is for you. The J-pole is a slim, omnidirectional, half-wave antenna fed at the end through a quarter-wave shorted transmission line. Its predecessor is the famous Zepp antenna developed for the Zeppelin airship.
    [ Hits: 381 | Votes: 2 | Rating: 10 ]
Antennas : Log Periodic
  • Log Periodic Dipole Array Calculator - Description and online calculator for Log Periodic Dipole Arrays LPDA are directional antennas featuring a relatively constant characteristics across a wide frequency range.
    [ Hits: 222 | Votes: 2 | Rating: 6 ]
Antennas : Receiving
  • Discone antenna - The basics of what is a discone antenna for wide band or bandwidth omnidirectional applications.
    [ Hits: 1353 | Votes: 0 | Rating: 0 ]
  • Double Half-Delta Loop RX Antenna - This wire antenna was developed to offer for a small, low-band, ground independent directional receiving antenna, it requires only two support poles. It is basically composed by two interconnected half delta loops and is better than a single flag or EWE, and almost as good as two phased EWE in the same space.
    [ Hits: 939 | Votes: 0 | Rating: 0 ]
Antennas : Rhombic
  • Rhombic Antennas - Description and simulation of two types of rhombic antennas, using the software 4Nec2: the simple bi-directional and the terminated directional rhombic antenna
    [ Hits: 840 | Votes: 1 | Rating: 10 ]
Antennas : Theory
  • Antenna Basics : Directional Antennas - An article describing basic concepts of antenna radiation, and in particular directional antennas like Yagi antennas or Quad antennas and how they determine the direction or signals.
    [ Hits: 346 | Votes: 1 | Rating: 2 ]
  • What We Can Expect from a 2-Element Beam - Method, Units of Measure, and the Dipole Standard of Reference. This article helps in understanding where does beam gain come from in directional aerials like in example Yagi antennas.
    [ Hits: 101 | Votes: 0 | Rating: 0 ]
Antennas : VHF UHF
  • Discone antenna - About the basics of what is a discone antenna for wide band or bandwidth omnidirectional applications
    [ Hits: 923 | Votes: 1 | Rating: 2 ]

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