On harmonics, this whole phenomenon re-occurs every 1/4λ of the harmonic frequency until about the center. While the far side (remaining 1/4λ) is not doing much at all. However expect performance similar to (or slightly worse than) an OCFD/Windom, nothing more.Īn interesting thing you might notice when looking at the 3D radiation pattern on the base frequency, is that only about 1/4λ of the wire closest to the feed point is doing most of the radiating, with the peak current occurring around the center. Generally speaking EFHW antennas seem to be a good compromise antenna due to their increased practicality of feeding at the wire-end, which is their significant advantage. Regardless of how you want to call it, it is essentially a dipole fed from one wire end with an impedance transformer to match the feed-point impedance to the transmission line impedance, that’s about it!. Well, I can confirm this by looking at the radiation pattern, and its electrical characteristics. I read somewhere that essentially there is no such thing as an EFHW, and that it actually is an extremely off-center fed dipole. the first resonant frequency band), and equally very similar to an Off-Center-Fed-Dipole on the resonant harmonic bands. The radiation pattern is very similar to a standard dipole on its fundamental (ie. Using MMANA-GAL I modelled it in an inverted-V topology since this would likely be the most common topology one would use, and it’s very simple to change it (ie to a sloper, horizontal wire etc).Ħm (50.1MHz) 3D Radiation Diagram of End-Fed Half Wave Antenna My EFHW is cut for 80 meters, and the manufacturer states that it has low VSWR on every amateur band, all the way up to 10M.
#Maa antenna files zip file#
I decided to design and build my own model from scratch, which is a pretty simple thing to do in MMANA-GAL Note: I have also made available a Zip file with some.maa files including the End fed Half Wave, Rybakov vertical, DL7PE Microvert, 80cm magnetic loop, 65ft Inverted L, EH antenna, 20-15-10m trap dipole, 80m OCFD (Windom) and an experimental W5GI mystery antenna file. So I decided to design and build my own model from scratch, which is a pretty simple thing to do in MMANA-GAL. There were several variants, however, none were accurate to my antenna’s specifications. You can download MMANA-GAL Basic from here: Īfter searching online, I couldn’t find a single reliable model of an EFHW in MMANA.
#Maa antenna files pro#
It comes in two versions, the basic version which is free, and the PRO version which is paid.
#Maa antenna files software#
It is arguably simpler, and in some cases more powerful, than other antenna modelling software such as EZNEC or 4nec2, and that is why it has become popular for relatively simple antenna modelling. MMANA-GAL is a popular antenna design, analyzing and modelling software tool, that is relatively easy to learn and use.
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