1 2 wave dipole

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1 2 wave dipole

39 links

Antennas : 10M
  • A double extended Zepp for 10 meters - How to make a Double Extended Zepp Antenna, almost a conventional halfwave dipole fed in the center with 300 or 450 ohm feed line by kh6jrm
    [ Hits: 1730 | Votes: 6 | Rating: 8.5 ]
  • 28 MHz Antenna Project - 10m Flowerpot Antenna, monoband half-wave vertical coaxial dipole antenna for 28 Mhz.
    [ Hits: 226 | Votes: 3 | Rating: 9.67 ]
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 ]
  • Coax Dipole for 2 meters band - A homebrew 2m 144.2 MHz vertical 1/2 wave Coaxial Dipole antenna project for your home QTH, SOTA, portable field operations/WICEN exercises or the emergency 2m Go-box. Elsewhere in amateur radio circles this antenna is known as a 2m Flower Pot Antenna
    [ Hits: 248 | Votes: 3 | Rating: 6 ]
  • Portable Coaxial Dipole Flower Pot Antenna - A homebrew 2m 144.2 MHz vertical 1/2 wave Coaxial Dipole antenna project for your home QTH, SOTA, portable field operations/WICEN exercises or the emergency 2m Go-box. Elsewhere in amateur radio circles this antenna is known as a 2m Flower Pot Antenna
    [ Hits: 103 | Votes: 1 | Rating: 8 ]
Antennas : 30M
  • A 30 Meter Sloping Dipole Antenna - This variation of the basic horizontal, half wavelength flat top dipole has proven to be a simple, effective antenna suitable for both home and portable use.
    [ Hits: 452 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Dipole Antennas
  • Half-Length Dipoles for 40 Meters - Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles
    [ Hits: 377 | Votes: 2 | Rating: 10 ]
Antennas : 80M
  • 80m Shortened Dipole Antenna - This antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up. The so called loaded dipole uses a coil in every dipole arm to electrically lengthen the mechanical too short dipole arms. Every coil has an inductivity of 120 microHenry.
    [ Hits: 152 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators
  • Log-Periodic Dipole Array Calculator - This LPDA calculator is based on the design procedure as described by L. B. Cebik, W4RNL (SK) in the 21st edition of The ARRL Antenna Handbook.
    [ Hits: 482 | Votes: 5 | Rating: 7 ]
Antennas : Fan Dipole
  • Half Wave Fan Dipole Antenna - Amateur Radio 40m 20m 15m Half Wave Fan dipole antenna project with part list, pictures and drawing. Includes the option to expand the antenna to cover the 80 meters band
    [ Hits: 678 | Votes: 1 | Rating: 1 ]
Antennas : Indoor
  • Stealth Apartment Antenna - Simple DIY stealth apartment antenna for 20m and 40m. It is basically a ZigZag quarter wave dipole antenna
    [ Hits: 3075 | Votes: 3 | Rating: 9.33 ]
Antennas : Loop
  • Quad Loop Antenna for 50 MHz - Building A Full-Wave Quad Loop Antenna for 6 Meters. This is an easy antenna to build and the materials cost about $15-20. It exhibits 1.8dB gain over a 1/2-wave dipole. Using an open-wire parallel feedline (commonly called ladder line) with an antenna tuner, it tunes up on the 10m band as a 5/8-wave loop as well
    [ Hits: 196 | Votes: 1 | Rating: 1 ]
Antennas : Portable
  • Portable wire antennas - This document describe serveral wire antennas, from the folded dipole, to the common halfwave monoband antenna for those who want to make HF portable operations in holiday.
    [ Hits: 839 | Votes: 2 | Rating: 1 ]
  • 2m Lightweight Portable Dipole - Lightweight portable QRP 2m & 70cm half wave dipole for SOTA or an emergency antenna for the 2m and 70cm Go-box.
    [ Hits: 174 | Votes: 1 | Rating: 9 ]
  • Portable VHF UHF Dipole Antenna - A SOTA Lightweight Portable 2m 70cm Dipole Antenna Lightweight portable QRP 2m and 70cm half wave dipole for SOTA or an emergency antenna for the 2m and 70cm Go-box.
    [ Hits: 174 | Votes: 0 | Rating: 0 ]
Antennas : Sloper
  • 2.6 MHz Halfwave Sloper - The 2.6 Mhz M Dipole is constructed from #10 stranded insulated wire available in most hardware stores. The feedpoint uses a T-section of PVC pipe
    [ Hits: 386 | Votes: 0 | Rating: 0 ]
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 : VHF UHF
  • VHF UHF BiQuad - This is a vertically polarized Broadside and Collinear Array each Loop is a vertically polarized Broadside Array both the right and the left side of the Loop is a bent 1/2 wave dipole working 180 degrees out of phase with the other one and that gives you 4.15dbi of gain
    [ Hits: 174 | Votes: 0 | Rating: 0 ]
Antennas : Yagi
  • W8JK Beam Antenna - The W8JK is a famous and effective DX antenna, first built by John Kraus, W8JK, in 1937. A Beam antenna with two parallel dipoles driven with opposite phase, with a close spacing of an eighth of a wavelength.
    [ Hits: 5140 | Votes: 21 | Rating: 7.19 ]

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