Inverted-L antenna: Difference between revisions
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(added some info - needs checking for accuracy needs diagram) |
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[http://vk1od.net/antenna/InvertedL/InvertedL.htm VK1OD Inverted L for HF] | * [http://vk1od.net/antenna/InvertedL/InvertedL.htm VK1OD Inverted L for HF] | ||
[http://www.clive.wankling.dsl.pipex.com/l.html An inverted L for small gardens] | * [http://www.clive.wankling.dsl.pipex.com/l.html An inverted L for small gardens] | ||
[http://www.n8mr.com/antenna.html Inverted L for 160m] | * [http://www.n8mr.com/antenna.html Inverted L for 160m] | ||
[http://www.n8mr.com/antenna.html GM0ONX 6 band inverted L antenna] | * [http://www.n8mr.com/antenna.html GM0ONX 6 band inverted L antenna] | ||
[http://www.iw5edi.com/ham-radio/?the-ever-popular-inverted-l-antenna,74 The ever popular Inverted L antenna] | * [http://www.iw5edi.com/ham-radio/?the-ever-popular-inverted-l-antenna,74 The ever popular Inverted L antenna] | ||
Revision as of 01:20, 5 November 2010
Related wiki pages Antenna, Propagation, Bands
What is it?
Theory of Operation
End-fed longwire antennas that are 5, 7, 9, 11, 13 or 15 electrical quarter-waves long will exhibit a feedpoint impedance of between 150 ohms and 250ohms. Using a 4:1 balun at the feedpoint will enable us to feed these antennas with a 50 ohm source and cable (usually coaxial cable).
Because the amateur bands are related harmonically it is possible to produce an inverted L antenna that is resonant or almost resonant on a number of bands.
For example: - a wire length of 128' (39m) will be resonant on 15m, 12m and 10m - a wire length of 121' (37m) will be resonant on 30m, 20m and 17m
External links