omni d

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omni d

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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 ]
  • 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
  • Six Meter Quad Turnstile Antenna - Simple 6 Metre DX Antenna based on an article by LB Cebick in QST May 2002 on a Quad Turnstile antenna. This antenna is basically two full wave loops mounted at right angles fed 90 degrees out of phase to produce an omni-directional horizontally polarized pattern
    [ Hits: 701 | Votes: 2 | Rating: 9.5 ]
  • Omni-directional Antenna for 50 MHz - This simple project, based on the orginal CobWebb-Antenna model, is about an horizontally polarized, omi-directional antenna for the six meter band.
    [ Hits: 542 | Votes: 2 | Rating: 7 ]
  • Six Meter Antennas Reviewed - In this article the author describes his personal experience on some antennas for 50 MHz he tested on the field, the six meter Dipole, Vertical, Moxon, a 3 element Yagi and an Omniangle antenna.
    [ Hits: 138 | Votes: 0 | Rating: 0 ]
Antennas : 6M : 6 meter J-Pole Antenna
  • 50MHz / 6m J-pole Antenna by VK4ADC - The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarized antenna without the need for a ground plane. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub.
    [ Hits: 439 | Votes: 4 | Rating: 6 ]
  • J-POLE for 50MHz by IZ0UPS - The J Pole antenna is a good omnidirectional antenna that can be used for portable or fixed station usage. It does not need a ground, and neither complex feed systems. It can be homemade with simple material and in several ways.Article in Italian
    [ Hits: 244 | Votes: 2 | Rating: 10 ]
Antennas : Halo
  • 2m Halo Antenna - Construction and analysis of a low cost omnidirectional horizontally polarized antenna for 144 MHz, including notes on halo antenna stacking
    [ Hits: 1011 | Votes: 9 | Rating: 5.34 ]
Antennas : Helical
  • Mixed Mode Helical Antenna - An experimental omni-directional antenna for 70cm which has both horizontal and vertical gain
    [ Hits: 1004 | Votes: 3 | Rating: 8 ]
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 : Magnetic Loop
  • Magnetic Loop for the 2m band - Such kind of omnidirectional antenna gives the possibility to be QRV with horizontal polarisation, as commonly used for the CW and SSB section of the 2m band. This actual design shows a 1.3:1 bandwidth of about 150kHz, centered to 144.200MHz.
    [ Hits: 572 | Votes: 1 | Rating: 10 ]
Antennas : VHF UHF
  • The Skew-Planar Wheel Antenna - This is a very useful aerial design,forgotten for 40 years. This antenna offer a low omnidirectional pattern and has circular polarization. Can be used as a beacon antenna and simulations are for U-VHF and upper
    [ Hits: 607 | Votes: 3 | Rating: 4 ]
  • The Turnstile antenna - An omnidirectional and horizontally polarized VHF antenna by EA4EOZ
    [ Hits: 914 | Votes: 4 | Rating: 3.25 ]
Antennas : Vertical
  • Balloon Vertical Omni-Antennas - Experimenting vertical wire antennas for 40 and 20 meters supported by balloons resulting in excellent gain in RX and good overall performance against horizontal dipole
    [ Hits: 771 | Votes: 1 | Rating: 5 ]
Antennas : WiFi
  • WiFi Spider Antenna - Quarter wave omni-directional spider antenna for 2.4GHz 802.11b
    [ Hits: 1009 | Votes: 8 | Rating: 7.5 ]
Manufacturers : Antennas : VHF UHF Microwave
  • Omnitec Antennas - Antennas for Amateur Radio and short wave listening
    [ Hits: 257 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Yaesu FT-847 Software : Logging
  • EA6DD WinLog - Win EA6DDlog free winows amateur radio logbook software in spanish offering cluster telnet connection, CAT interface via Omnirig, QSL management, QRZ and hmaqth connections
    [ Hits: 848 | Votes: 3 | Rating: 9.33 ]
Technical Reference : SWR Meters
  • 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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