Search results
Query: antenna v beam
Links: 223 | Categories: 4
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In the long history of beam aerials there has persistently existed the claim that certain types of aerials perform better than yagis. -
how to make a gamma match for a antenna. The Gamma match is the most used matching device used for yagi beams. -
Building a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. -
A 21 MHz Four Square Beam Antenna This popular antenna for the lower bands, can also work well on 15 meters, QST Article -
A 4 elements handitenna for 70 cm band. This is my version of the K5OE Handitenna. This one is a four Element instead of three, as I had less of a crunch on space than he did. The 1st three elements (Reflector, Driven Element, and Director 1) are the same dimensions as his were. -
Dedicated to State-of-the-Art lightweight portable radio. Sotabeams produces and sells amateur radio products dedicated to ham radio portable operations. Antennas, supports and masts, filters, wires and more accessories for amateur radio. -
The Yagi-Uda antenna, information on basic design, project and measure of Yagi-Uda antenna, include free repository/sample of beam antenna. -
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About the clemens match for beam antenna, as an alternative to common gamma matching techniques -
Exagonal Beam antenna cover 20-17-15-10 meters By KE4NU -
A web site dedicated to hex beam homebrewing. The hexagonal beam has become a wildly popular antenna. It is a directional antenna that provides great performance and does not require a full scale, expensive tower. -
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This project details the construction of a **full-sized 40-meter vertical antenna**, born from a renewed interest in 7 MHz operation and a desire for improved effectiveness over simple dipoles. The author, K5DKZ, initially focused on VHF experimentation, which provided an inventory of aluminum tubing and fiberglass spreaders for this endeavor. Before this vertical, K5DKZ utilized an 80/40 meter inverted-vee trap dipole and a 40-meter broadband dipole, but now primarily uses a pair of full-sized, phased, quarter-wave verticals spaced 35 feet apart for serious 40-meter work. The construction involves a base-heavy design for stability, using a 44.5-inch section of 1-1/4 inch steel TV mast driven into 1-3/8 inch aluminum tubing, insulated by a 105-inch section of Schedule 40 PVC pipe. The assembly reaches 31 feet, close to the 32 feet required for a quarter-wavelength on 40 meters, with fine-tuning achieved by winding wire onto a fiberglass spreader. The design is explicitly presented as a foundation for a two-element 40-meter Yagi beam, outlining modifications like substituting aluminum for steel in the base and using an inductive hairpin match for the driven element. The article also discusses tuning considerations for a large 40-meter beam, noting the 100 to 200 kHz upward frequency shift when raised, and suggesting methods for installation on a tower. The author emphasizes the cost-effectiveness and good performance of the monopole approach, especially when multiple verticals are needed. -
A fractional bandwidth of up to 30:1 characterizes spiral antennas, making them highly effective across a very wide frequency range, often from 1 GHz to 30 GHz. The resource details two primary types: the **Log-Periodic Spiral Antenna** and the **Archimedean Spiral Antenna**, defining each with specific polar functions and illustrating their planar configurations. It explains that spiral antennas are typically circularly polarized, with a Half-Power Beamwidth (HPBW) of approximately 70-90 degrees, and a peak radiation direction perpendicular to the spiral plane. The content elaborates on critical design parameters affecting radiation, including the total length (outer radius) for lowest frequency, the flare rate ('a' constant) for optimal radiation versus capacitive behavior, the feed structure (often an infinite balun) for high-frequency operation, and the number of turns (typically 1.5 to 3 turns). It also discusses the theoretical impedance of 188 Ohms for Log-Periodic spirals, derived from Babinet's Principle, noting actual impedances are often 100-150 Ohms. The article presents a simple construction method for an Archimedean spiral, demonstrating VSWR and efficiency measurements. Measurements from a constructed spiral antenna show a VSWR that is fairly constant across the band, albeit with a mismatch loss of about 3 dB. The antenna efficiency remains around -5 dB (31.6%) across its operating range, indicating a decent wideband radiator despite opportunities for optimization. -
The Gizmotchy high performance horizontal and vertical beam antenna for 2/6/10/11 meter bands -
Design and build an 6 m dipole antenna from aluminum, tubing, that resembles the active element of a yagi beam antenna. -
An homebrew project for a 3 element coil-loaded Yagi beam antenna for 40 Meter band -
5-element antenna, with which G0JJL has worked lots of EU crossband, and won the RSGB Christmas Cumulatives 70MHz section twice in a row. -
Antenna dealer, antenna masts, towers, mounts, antenna rotators, steppir and optibeam inrad dealer -
Article describing how to homebrew a yagi antenna for 50 MHz, includes plans for a four and five elements yagi beam and details how how match impedence with a gamma match -
A homemade 10 element Yagi Beam Antenna for 50 Mhz by Rod Mackintosh, a NBS Yagi on a 13.2 metre boom. -
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Ground Plane - 1/4 wave vertical, J-Pole, 3 Element Yagi Beam and simple antenna supports -
Fabricates baseplate components, and provides hardware kits for DIY hex beam, spiderbeam and moxon antennas. -
A compact 2 element W8JK beam antenna for 20M to 10M bands by AF6SA -
In this PDF article Zack Lau describe how to homebrew a four element yagi beam antenna for 50 MHz band, including how to build mounting blocks and tubing clamps to hold elements. -
A Compact and efficient multiband beam antenna based on a Modified W8JK Array by K5LJ -
The antenna described here is a direct-connect dual-rectangle beam for use on 70 cm between 440 and 450 MHz -
An HexBeam antenna project, a 2 full elements on six bands -
A project that describes a build a multiband wire beam antenna. A 3 band single feed moxon antenna for 20,15,10 meters. -
A 5 element yagi beam antenna for ten meters band with full dimentsions, eznec file and coax match informations for 50 ohms feed line -
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Spider Beam antenna pictures in a youtube video -
The broad band hexagonal beam (hexbeam) designed by G3TXQ and built by K4KIO -
A homemade 70cm handitenna made with a PVC pipe -
A ten element ultra-lightweight yagi beam antenna for 144 MHz based on YU7EF design concept -
50MHz Collapsible 2 Element Mini Beam antenna, an overview the development of the 6MBA. -
A multiband HF Vee Beam antenna at VK5SW. If you're lucky enough to have the room, perhaps you may like to put up a multiband Vee Beam antenna for the HF bands. -
The Triple-M-beam calculation program is used for the calculation of Triple-M-beam antennas by DG0KW -
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A 4 element yagi beam antenna for the 17 meters band with pictures and element dimension and spacing -
A long picture gallery of a homebrew hexbeam antenna project -
Spanish HexBeam antenna manufacturer, produce antennas kits, and part for HexBeam antennas -
MW0JZE Manufacturer of the G3TXQ Broadband Hexagonal Beam - HexBeam Antennas -
Ham radio HF antennas manufacturer, produce HF dynamic beam antennas, and vertical pole antenna. Offer kits and parts to build you own dynamic antennas, by IZ0AEG -
HF Beam Calculator for Amateur Radio and CB Communications -
This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen. -
Constructing a compact directional antenna for the 17-meter band, this resource details the build process for a Moxon rectangle, a two-element Yagi variant with folded-back elements. It covers the antenna's evolution from the _VK2ABQ beam_ and provides specific dimensions for a version built using fishing pole whips. The content includes a discussion of the antenna's radiation pattern, feedpoint impedance, and its inherent front-to-back ratio, which is often superior to a standard two-element Yagi. Practical considerations for element spacing and material choices are also addressed, alongside a visual representation of the antenna's physical layout. Performance data presented includes a comparison showing the Moxon rectangle's **2.5 dB gain** over a half-wave dipole and a front-to-back ratio of **20 dB**. The resource also touches upon the antenna's relatively wide bandwidth for a two-element beam and its suitability for portable operations due to its compact footprint. It offers insights into optimizing the design for specific operating conditions and discusses the advantages of its lower take-off angle compared to omnidirectional wire antennas, making it effective for DX contacts on the 17-meter band. -
eHam reviews on Cushcraft MA5B Mini Beam antenna