antenna measure

65 links

Tape Measure 2M Beam - A Tape Measure Beam Antenna for Radio Direction Finding based on WB2HOL design.
[ Hits: 571 | Votes: 0 | Rating: 0 ]

5 Element LFA Yagi for 6 meters band - A Loop Fed Array Yagi antenna for 50 MHz featuring 11 dBi gain and 23 f/b ratio. In this excellent page the author even includes a detailed drawing in DWG format, with element lenght and spacing measures, in a separa file a full list of material list needed to build this yagi antenna including source and price, the EZnec file for this antenna plan, and a lot of pictures of this LFA Yagi for 50 Mhz. A ten page PDF file containing all infos, is also available to download.
[ Hits: 1179 | Votes: 7 | Rating: 8.57 ]

Full Wave Loop Antenna Calculator - Use this online calculator to determine the length of a full-wave loop antenna from the frequency. Both metric and English units of measurement are supported. Quarter-wave matching section lengths are also calculated.
[ Hits: 930 | Votes: 6 | Rating: 7 ]
Vertical Antenna Calculator - Use this online calculator to determine the length of a quarter-wave antenna from the frequency. Both metric and English units of measurement are supported.
[ Hits: 918 | Votes: 8 | Rating: 6.99 ]
Dipole Calculator - Use this online calculator to determine the length of a dipole antenna from the frequency. Both metric and English units of measurement are supported.
[ Hits: 944 | Votes: 11 | Rating: 6 ]

A Reversible Beverage at ZL3IX ^updated - How do two-wire reversible direction Beverages work, an excellent document that explains fundamentals of beverage antennas. This article details the design and performance of a reversible beverage antenna. Leveraging orthogonality between common mode and differential mode currents on a 2-wire line, this antenna facilitates independent reception from both ends. While common mode signals arrive and are summed on a transformer's secondary for common mode reception, differential mode signals induce anti-phase currents, providing individual reception. Various measurements explore impedance, transmission loss, and F/B ratio, highlighting the antenna's effectiveness and areas for improvement. Notably, increasing the antenna's height significantly improved performance.
[ Hits: 519 | Votes: 0 | Rating: 0 ]

Fan Dipole Antenna for 40 20 and 6 meters - A fand dipole antenna home made for the 7,14,50 MHz. This article descbribes how to homebrew the antenna, hot to setup and some SWR measurements.
[ Hits: 329 | Votes: 0 | Rating: 0 ]

High Performance common-mode chokes - May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.
[ Hits: 686 | Votes: 1 | Rating: 10 ]

Spiderbeam VS Hex Beam - Differences of Hex Beam and Spiderbeam antennas designs, performance and measurements, rotor considerations when using this two kind of antennas
[ Hits: 410 | Votes: 6 | Rating: 9.67 ]

Antenna Maria Maluca - Antenna construction project and report on efficiency and SWR measurement by DL1RLB, project implemented in May 2008
[ Hits: 507 | Votes: 1 | Rating: 9 ]

RF Measurement on W3EDP antenna - RF Current measurements on a Long Wire W3EDP antenna
[ Hits: 628 | Votes: 2 | Rating: 5.5 ]
The Yagi Antenna - Presentation - A presentation of the Yagi Antennas, and other interesting tid-bits by Brian Mileshosky. This document explains basic concepts of Yagi-Uda antenna theory, influence of reflector and directors on global antenna gain and directivity of radio waves. A simple tape measure antenna project is also included.
[ Hits: 541 | Votes: 2 | Rating: 7 ]
What We Can Expect from a 2-Element Beam - Method, Units of Measure, and the Dipole Standard of Reference. This article helps in understanding where does beam gain come from in directional aerials like in example Yagi antennas.
[ Hits: 101 | Votes: 0 | Rating: 0 ]

Tape Measure VHF antenna - A cheap and easy to build tape measure antenna suitable for RDF or any portable operation use.
[ Hits: 575 | Votes: 0 | Rating: 0 ]
Double Quad Antenna for VHF UHF - The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR
[ Hits: 247 | Votes: 6 | Rating: 6.33 ]

Tape Measure antenna for RDF - An RDF optimized version of popular tape measure antenna
[ Hits: 464 | Votes: 0 | Rating: 0 ]

HexBeam vs SpiderBeam - In these slides, differences between spiderbeam antenna and hexbeam antennas are explained comparing performances and measurements.
[ Hits: 2021 | Votes: 4 | Rating: 7 ]

WiFi SWR meter - An home made SWR meter for 2.4 GHz. A DIY SWR meter that allow precise measurements and calibration of any WiFi antenna. This is test equipment everyone who build wifi antennas should have in their shack. Article is in french and include some videos.
[ Hits: 1704 | Votes: 10 | Rating: 4.9 ]

Antuino - Antenna Test Equipment - Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).
[ Hits: 305 | Votes: 0 | Rating: 0 ]

miniVNA PRO Modifications - The mini Radio Solutions miniVNA PRO is the only affordable vector network analyser (VNA) I know of that offers remote wireless operation. This is very interesting because it allows to measure the input impedance of HF antennas installed at height without having to deal with coax cable lengths, baluns nor common mode suppression chokes. However, to render the miniVNA PRO truly field proof, it requires a number of significant modifications.
[ Hits: 136 | Votes: 5 | Rating: 7.8 ]