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Antennas : 160M- KE4UYP Linear loaded vertical antenna
- This is a vertically and horizontally polarized antenna the Linear loaded 1/4 wave length vertical radiator introduces very little loss for 80 or 160 meters
[ Hits: 13791 | Votes: 18 | Rating: 6.71 ]
- 40-80 Half-Extended Double Zepp Antenna
- A dual-bander for 80M and 40m. An Extended Double Zepp (EDZ) is a 5/4 wavelength center-fed dipole.
This article will introduce the Half-Extended Double Zepp (HEDZ) which has characteristics that a lot of amateur radio operators should find quite interesting
[ Hits: 11391 | Votes: 9 | Rating: 4.44 ]
- Six Meter Wavelength Band Antennas
- Why 6 meter hams design the best antennas
[ Hits: 2671 | Votes: 4 | Rating: 8.25 ]
- Bazooka dipole for 70 cm band
- Here is a very simple 70cms dipole from Harald PD2HFE, which uses a single piece of
RG-213 coaxial cable 34 cms in length.
[ Hits: 16548 | Votes: 30 | Rating: 6.67 ]
- The simplest phased array feed system that works
- How to calculate "phasing line" lengths that actually work.
[ Hits: 2178 | Votes: 4 | Rating: 6.75 ]
- A 1:1 Coaxial Balun
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- PDF article about a coaxial 1:1 balun, original concept by I4BBE using a quarter-wavelength and the three-quarter-wave adapting sections with the 50-Ohm coaxial cable by I0QM
[ Hits: 44462 | Votes: 30 | Rating: 7.22 ]
- 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 ]
- End-Fed Halfwave Antenna
- The end-fed halfwave antenna is a resonant half wavelength long antenna like a dipole antenna except for it is fed at its end rather then in the center. This antenna is as old as radio and is probably best known as the Zepp Antenna
[ Hits: 24207 | Votes: 18 | Rating: 7.55 ]
- Yagi Element Mounting Considerations
- One of the most important considerations when designing and building a Yagi antenna is the method used to attach the elements to a boom. This is true because the boom influences the electrical length of the elements. In this article JH Reisert explain with drawings techniques on mounting yagi antenna elements to a boom
[ Hits: 4305 | Votes: 2 | Rating: 8.5 ]
- Antenna Trimming Chart
- Use this chart as an aid in trimming the length of your antenna. It gives you an idea of the change in wire length needed to move antenna resonance a specific number of KHz.
[ Hits: 3537 | Votes: 7 | Rating: 6.14 ]
- Design your Own Super J Pole
- a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole.
[ Hits: 7846 | Votes: 14 | Rating: 5.29 ]
- Mirrored J-Pole
- The mirror-image J-Pole is very easy to construct and requires only two T-Fittings plus a length of copper pipe.
[ Hits: 4119 | Votes: 3 | Rating: 4.67 ]
- Magnetic Loop Antenna
- Although a magnetic loop antenna(aka small loop antenna) is very compact, its efficiency is close to a half-wavelength dipole if carefully built.
[ Hits: 1523 | Votes: 1 | Rating: 10 ]
- Home Brew VHF UHF dual band antenna
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- Contructing precedure and tune up of a dual band mobile antenna. This antenna is just a 1/4 wavelength resonator for both UHF and VHF band. It provides no GAIN as compared to other multi-section design.
[ Hits: 36840 | Votes: 38 | Rating: 4.36 ]
- 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 ]
- Long Loopstick Antenna
- Wound on a 3 foot length of PVC pipe, the long loopstick antenna was an experiment to try to improve AM radio reception without using a long wire or ground.
[ Hits: 4376 | Votes: 1 | Rating: 10 ]
- VHF/UHF Yagi Antenna Design
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- Design your VHF UHF Yagi antenna online, a JavaScript enhanced web page that implements the design of an antenna for 2m and 70cm bands. This page offers a streamlined experience for Yagi antenna design enthusiasts. It assumes prior knowledge of Yagi design principles, minimizing distractions with a user-friendly interface. Equipped with essential equations, it provides instant design feedback. Red font warnings indicate design limitations, ensuring practical results. Constraints include Gain (11.8-21.6 dBd) and Boom Length (2.2-39 wavelengths), with additional frequency-dependent restrictions noted in input fields.
[ Hits: 147401 | Votes: 1105 | Rating: 6.95 ]
- VHF / UHF Direct Connect Beams Lengths
- Here are some lengths and spacings for various direct connect beams.
[ Hits: 1315 | Votes: 2 | Rating: 5.5 ]
- Balloon-supported verticals
- Using balloons to raise lengths of wire can be great fun - as well as making it possible to work the DX on 136 kHz from small gardens.
[ Hits: 1803 | Votes: 1 | Rating: 10 ]
- SardineCanAntenna - Seattle Wireless
- Sardine Can Antenna. is a BiQuad or Bi circle - wire length each side (8 x 1/4 waves ) 31 mm
[ Hits: 10235 | Votes: 13 | Rating: 4.61 ]
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