antenna measurement

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antenna measurement

40 links

Antennas : 20M : 20 meter Vertical Antennas
  • 4m Tall Vertical Dipole for 20m - Constructed in May 2008, this innovative 4m tall electrically full-size halfwave vertical dipole, tunable to multiple bands, offers HF coverage despite its space-saving design. Inspired by cost-effective DIY alternatives, the antenna design departs from conventional center-fed approaches, utilizing asymmetrical dimensions. Despite resonance challenges, the antenna's performance remains viable, boasting broad bandwidth and adaptability, as demonstrated through SWR measurements and EZNEC predictions.
    [ Hits: 65 | Votes: 0 | Rating: 0 ]
Antennas : 2M
  • 2 Meter Slim Jim antenna from Ordinary Wires - Slim Jim (J Integrated Match J-Pole) is probably the most easiest and powerful 2 meter antenna to build provided you have the exact measurement and material to build it.
    [ Hits: 5349 | Votes: 6 | Rating: 5.17 ]
  • Budget-Friendly 5-Element Quad Antenna Design - Constructing a 5-element quad antenna, the author aimed for low cost and simplicity, resulting in an effective design with 11 dBi gain and SWR of 2:1 or better across the 2-meter band. Using wood and dowels, the antenna costs under $8 and takes less than two hours to build with basic tools. The model predicts excellent performance, confirmed by ARRL Lab measurements. Practical field results demonstrate improved communication, even in simplex mode.
    [ Hits: 64 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators
  • 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: 929 | Votes: 5 | Rating: 8.2 ]
  • 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: 915 | 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: 942 | Votes: 11 | Rating: 6 ]
  • Extended Double Zepp NVIS Antenna Calculator  updated - Extended Double Zepp measurements for all ham bands, and online calculator. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line
    [ Hits: 123 | Votes: 3 | Rating: 7 ]
Antennas : Coils Antennas : Fan Dipole
  • 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: 326 | Votes: 0 | Rating: 0 ]
Antennas : HexBeam
  • 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: 408 | Votes: 6 | Rating: 9.67 ]
Antennas : Horn Antennas : Loop
  • Full wave loop antennas - Measurements for building a full wave loop using wire
    [ Hits: 1120 | Votes: 1 | Rating: 3 ]
Antennas : Maria Maluca
  • Antenna Maria Maluca - Antenna construction project and report on efficiency and SWR measurement by DL1RLB, project implemented in May 2008
    [ Hits: 505 | Votes: 1 | Rating: 9 ]
Antennas : Repair and Maintenance Antennas : Theory
  • Measuring 2.4 GHz Helix Antennas - It is not very difficult to design and make a helix antenna for a specific frequency and gain. It is more difficult for the serious experimenter to make precise measurements of the finished antenna.
    [ Hits: 746 | Votes: 5 | Rating: 9.2 ]
  • RF Measurement on W3EDP antenna - RF Current measurements on a Long Wire W3EDP antenna
    [ Hits: 628 | Votes: 2 | Rating: 5.5 ]
  • Antenna Measurements - Testing of real antennas is fundamental to antenna theory. The most common and desired measurements are the antenna radiation pattern including antenna gain and efficiency, the impedance or VSWR, the bandwidth, and the polarization. The procedures and equipment used in antenna measurements are described in this page.
    [ Hits: 61 | Votes: 1 | Rating: 10 ]
Antennas : Theory : Impedance matching
  • Performance of 49:1 Ferrite Core Transformers - There are quite a few recipes for building a suitable transformer for an end fed half wave antenna (EFHW), but I was never sure I really understood the main principles. So, I wound a bunch of transformers, made measurements on them using my NanoVNA, learned how to get what I really wanted out of the VNA measurements, and in the process discovered how to build better transformers and be able to predict what they will do
    [ Hits: 151 | Votes: 4 | Rating: 7 ]
Radio Equipment : Reviews and Comparisons
  • HexBeam vs SpiderBeam - In these slides, differences between spiderbeam antenna and hexbeam antennas are explained comparing performances and measurements.
    [ Hits: 2020 | Votes: 4 | Rating: 7 ]
Technical Reference : SWR Meters
  • 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: 1699 | Votes: 10 | Rating: 4.9 ]

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