hi q antennas

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hi q antennas

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Antennas : 40M : 40 meter Vertical Antennas
  • 40m Vertical End-Fed Antenna - A quarter wave vertical end-fed antenna for the 40 meters band. As all vertical antennas, also this aerial requires a good earthing system. In this project the ground is composed by twelve 4, wires buried in the lawn by using a spade to create a slit to drop the wire into.
    [ Hits: 1848 | Votes: 6 | Rating: 5 ]
Antennas : Antenna Calculators
  • Quick antenna length calculator - An excel spreadsheet that in a really simple way checks how much to trim your antenna elements. Download the xls file and watch the presentation video include in this page
    [ Hits: 565 | Votes: 0 | Rating: 0 ]
Antennas : Beverage
  • The Wave Antenna for 200-Meter Reception - A QST Article published in November 1922 is about the origin of Beverage antennas, an unidirectional antenna type that was discovered and experimented for the first time in that period. This article is the introduction to beverage antenna theory, by the homonimous autho H. H. Beverage.
    [ Hits: 82 | Votes: 0 | Rating: 0 ]
  • About The Beverage Antennas - Receiving Antennas - An article about the Beverage antennas, super long wire receiving antennas thar are unidirectional and have a very low noise that makes this antenna excellent for low band dxing. By Thomas R. Sundstrom W2XQ, 73, June 1981, 73 Magazine
    [ Hits: 81 | Votes: 1 | Rating: 10 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • The End-Fed Half-Wave Antenna - Presentation - A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.
    [ Hits: 182 | Votes: 3 | Rating: 8.67 ]
  • End Fed Half-Wave Antennas - An interesting article on end fed half-wave wire antennas with a couple of original experiments. Author illustrate the role of the QRP matchbox, and a 40/20 meter antenna with a center stub making it a large bandwidth antenna for 40 and 20. Includes also an 80/40 end fed with the typical coil to make it available on 80 merts band.
    [ Hits: 163 | Votes: 1 | Rating: 10 ]
Antennas : Homebrewing Techniques Antennas : Installation
  • Broadcast Antennas on Buildings - When a broadcast antenna is to be placed on top of a building, there are special problems of feeding and grounding. The radiator is usually electrically short, that is, much less than one-quarter wavelength high.
    [ Hits: 289 | Votes: 2 | Rating: 10 ]
Antennas : Portable
  • QRP Link Dipole Antenna - Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. I wanted to make a simple dipole antenna for QRP portable operation that could be used on multiple bands.
    [ Hits: 196 | Votes: 2 | Rating: 7.5 ]
Antennas : Theory : Antenna Gain
  • The Easy Way Antenna Systems - This document is a must read for anyone considering building a good low cost HF multi-band antenna system. The author combine in this document four important ingredients to produce simple but effective antenna system, like antennas of non resonant length, line attenuation, the transmatch and the balun
    [ Hits: 255 | Votes: 2 | Rating: 4.5 ]
Antennas : Theory : Impedance matching
  • The Gamma Match - The gamma match was originally invented as a means of feeding vertical monopole antennas for medium wave broadcasts, which were earthed at the base for lightning protection- Hams are more likely to use a gamma match to feed a dipole or loop element, but the basic theory is easier to understand for the case of a quarter wave monopole.
    [ Hits: 684 | Votes: 1 | Rating: 8 ]
Antennas : VHF UHF
  • Dual Band VHF UHF Yagi Antenna projects - On this page are designs for Dual Band 2M / 70cm antennas. All antennas are 50 ohm designed driver. These Yagis have a unique element called a Open Sleeve. 4 Element 5 element and 9 element Dual Band - 2M / 70cm antenna projects
    [ Hits: 606 | Votes: 4 | Rating: 5.75 ]
Antennas : W3EDP
  • W3EDP Antenna Notes - Hints for building a W3EDP-Antenna, includes the construction of the 1:4-balun by DK7ZB
    [ Hits: 738 | Votes: 3 | Rating: 9.33 ]
Technical Reference : Vector Network Analyzer
  • 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: 60 | Votes: 5 | Rating: 7.8 ]

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