2 m 1/2 wave
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Antennas : 40M- 40 Meter Bowtie Antenna
- A bowtie antenna is a type of antenna that reputedly provides higher gain at lower radiation angles than a center-fed dipole antenna at heights considerably less than 1/2 wavelength above ground.
[ Hits: 1422 | Votes: 4 | Rating: 7 ]
- 50MHz J-Pole Antenna
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- Need a general purpose antenna on the magic band? The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarised 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: 33818 | Votes: 18 | Rating: 7.05 ]
- The Ugly MacGyver 6 meter J-pole Antenna
- Essentially, a J-pole is a 1/2 wave resonant antenna connected to a quarter wave matching stub. The feedline is connected at a point on the matching stub that is at the feedline's characteristic impedance. The result is 3/4 of a wavelength on one side and 1/4 wavelength on the other side.
[ Hits: 202 | Votes: 0 | Rating: 0 ]
- 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 ]
- 1:49 Transformer
- This 1:49 transformer is used with wires any multiple of 1/2 wavelength. This is not a matching network, it's a wideband transformer and it has some advantages compared to LC matching
[ Hits: 2471 | Votes: 25 | Rating: 5.84 ]
- Shortened Center-Fed Half-Wave Dipole
- Design your owm HF shiortened dipole. Includes a diagram of a lumped-constant loaded dipole antenna that is intended to fit in available space, rather than requiring a full 1/2 wavelength, at a specified frequency
[ Hits: 2878 | Votes: 6 | Rating: 9.83 ]
- How to make a Simple Dipole Antenna
- It is very easy to create a simple 1/2 wave dipole, all you need is some lengths of wire such as the core of some mains flex or even a straightened out metal coat hanger, some co-ax cable and a connector for your scanners antenna input
[ Hits: 4053 | Votes: 7 | Rating: 6.71 ]
- The Square Pole antenna
- The SQUARE-Pole is a 1/2-wave dipole that has been bent into a square by WB2VUO
[ Hits: 2328 | Votes: 0 | Rating: 0 ]
- 2-element 1/2 wave collinear J-Pole
- This article document a 2 element half wave collinear J-Pole antenna by KC9EOT and KB8OJH
[ Hits: 1523 | Votes: 7 | Rating: 4.57 ]
- Improving the Super-J
- The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole.
As many attest, there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points.
The Super-J has very little separation between the two half-wave radiators.
[ Hits: 971 | Votes: 2 | Rating: 5.5 ]
- Improving Gain of the Super J-Pole Antenna
- The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. Get 0.8 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.
[ Hits: 189 | Votes: 0 | Rating: 0 ]
- J-Pole and Expanded Super J-Pole
- The standard J-Pole antenna is a end fed 1/2 wavelength antenna, in this article is explained also how to build an expanded Super J Pole that provides about 4.5 dbd gain. These antennas can be built from EMT electric conduit pipe
[ Hits: 313 | Votes: 4 | Rating: 5.5 ]
- Fundamentals of Off-Center-Fed Dipoles
- Off-center-fed dipoles (OCFs) are 1/2-wavelength wire antennas fed at neither the center nor the end, but somewhere between--off-center
[ Hits: 4496 | Votes: 2 | Rating: 5.5 ]
- BiQuad Antenna for 144/440
- 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 by KE4UYP
[ Hits: 7595 | Votes: 14 | Rating: 4.86 ]
- 6 meters band Half Wave vertical
- 1/2wave vertical antenna for the 6-meterband and a 5/8 ground plane antenna for 50 Mhz
[ Hits: 3060 | Votes: 1 | Rating: 8 ]
- Homebrew 5/8 Wave HF Vertical Antennas
- The advantage of 5/8 wave antenna is that it has the lowest angle of radiation and has about 1dB more gain when compared to 1/4 and 1/2 verticals. So the 5/8 should be the favourite choice for DX.
[ Hits: 712 | Votes: 2 | Rating: 8 ]
- 5 Band Pipe Vertical Antenna
- A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 20 - 10 meters including WARC Bands, it is designed for portability for field days, camping, or permanent installation, cost, and to achieve at least 1/2 wavelength on the WARC bands.
[ Hits: 549 | Votes: 5 | Rating: 6.2 ]
- Ni4L ANTENNAS & ELECTRONICS
- Ham radio antennas and electronics, specialized in 1/2 wave dipole, OCF dipole, windom, full wave loop, end fed, inverted L, portable end fed antenna, long wire, SWL antenna, fan dipole, multiband dipole, G5RV and military antennas.
[ Hits: 1608 | Votes: 7 | Rating: 8.86 ]
- Motorcycle mobile: 1/2 or 5/8 wave antenna
- Article on mobile ham radio antenna setup
[ Hits: 1792 | Votes: 2 | Rating: 5.5 ]
- Troubleshooting Traps
- This article refers mainly to the old Cushcraft 1/4 wavelength AV series of antennas (12AVQ, 14AVQ etc) hence the references to radials. The R series (R5, R7 etc) are 1/2 wavelength antennas, and the radials are NOT 1/4 wavelength resonant.
[ Hits: 2775 | Votes: 0 | Rating: 0 ]
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