j beam

91 links

160m 80m Vertical Antenna - A dual band vertical antenna for 160 and 80 meters band, on a 18m spiderbeam fiberglass pole. This vertical is a good compromise when you want good performance on these two low ham bands and don't have the space to install two seperate antennas.
[ Hits: 186 | Votes: 0 | Rating: 0 ]

VDA Antenna for 30m ^new - This project documents the construction and enhancement of a 30m Vertical Dipole Array (VDA) antenna inspired by Remco 7QNL article. Initial design utilized an 18m Spiderbeam pole and a 4m boom. Improvements included a lighter boom structure using fishing rods and a revised coaxial arrangement for enhanced mechanical stability.
[ Hits: 38 | Votes: 0 | Rating: 0 ]

A 6m beam for portable operations - A project for a six meters Yagi beam antenna, built mainly for portable operations. This is a 4 element Yagi beam with a 4 meters boom.
[ Hits: 77 | Votes: 0 | Rating: 0 ]

80m Vertical - This is a FULL SIZE quarter-wavelength vertical made on a 18m Spiderbeam fiberglass telescoping Spiderpole
[ Hits: 139 | Votes: 0 | Rating: 0 ]

Phased Array Antennas - Phased array antennas are composed of multiple individual antenna elements that can have their phase and amplitude controlled to steer the main beam direction in real-time. They are used in radar, communications, and electronic warfare, and offer improved gain and reduced side lobes. A comprehensive document on Phased Arrays include techniques to increase the Antenna Gain and change the Radiation Pattern
[ Hits: 82 | Votes: 0 | Rating: 0 ]

Three-Element Hex Beam Project - Building the Three-Element Hex Beam. A project and construction phase of an HF hex-Beam antenna using trees to hang the antenna and a Channel Master antenna rotator.
[ Hits: 306 | Votes: 6 | Rating: 8.67 ]

Moxon Mania - Building the Ultimate 4-Band Moxon Antenna - The article details the design and construction of a four-band Moxon beam by a radio amateur. The beam, mounted atop a rooftop tower, aimed for gain over a dipole on 20 meters, cost under $500, and included additional bands. The design features fiberglass spreaders, four bands (20/15/10/6 meters), and a single feedpoint. The construction involved computer modeling, NEC source code, and specific dimensions. The article outlines the assembly, materials, and tuning process, including in-situ adjustments for optimal performance. Despite initial challenges, the beam improved signal strength and facilitated contacts on multiple bands, marking it as the best HF antenna the author has owned.
[ Hits: 96 | Votes: 0 | Rating: 0 ]

80m-40m Dual-Band Vertical - A dual band 40-80 vertical antenna on an 18m Spiderbeam Fiberglass Spiderpole, with monoband performance
[ Hits: 160 | Votes: 2 | Rating: 10 ]

DIY 850 MHz Yagi Antenna - This DIY Yagi costs less than 20 Dollars, and let you increase the performance of your connection. With this project you can build a better Yagi beam antenna resonant on 850MHz, a 8 element yagi directional antenna
[ Hits: 43 | Votes: 0 | Rating: 0 ]

Wire Beam Antenna Types - In this article the author feature the various types of beam antenna that can ben builw using wires, like moxon, spieder and hex beam, delta loops, bird yagi
[ Hits: 153 | Votes: 2 | Rating: 6 ]

YAESU beam controller to suit RigExpert WTI-1 - Beam Controller Interface Project. The control system will be via the internet and consist of a Rig-Expert WTI-1 interface which provides access to CAT commands, PTT, and Rx and Tx audio.
[ Hits: 38 | Votes: 0 | Rating: 0 ]