MMANA-GAL uses only meters and millimeters for all its purposes. Any comments, corrections, or improvements can be sent to me. The optimization page in the MMANA-GAL help file is necessary reading, as I am trying here to give a little more explanation to the very brief information given by the programmer. I assume the reader has some initial familiarity with MMANA-GAL already, having opened up some of the example files and clicked around a bit and also knows some basic antenna theory. These methods are mainly those which I have found useful in designing HF, mostly monoband antennas. Part 2 will go over the array of options in more detail. (The amateur radio community seems to have focused on the EZNEC software, which is lacking in these abilities.) The first part is an overview of the process, using a 3 element 20m yagi as an example.
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This program has a very complete optimization engine, which is unique for free software.
See:Ĭ:\MMANA-GAL_Basic\ANT\VHF beams\TV Log Yagi-UHF.maaīTW, for reasons I don"t understand, the professional version of MMANA-GAL does not ship with the examples! So I keep both the basic and the Pro versions on my machines.1 A short antenna optimization tutorial using MMANA-GAL Home MMANA Quick Start part1 part2 part3 part4 Al Couper NH7O These pages will present a short guide to antenna optimization using MMANA-GAL. I think you want to make the longest element a half-wave on the lowest frequency of interest, but check the paper by Peixeiro for more information.įor a design file for MMANA-GAL, why not look in the examples? There is one at least one. Let be L(i) the length of the i-th element, and L(i-1) the length of its precedent,Īnd let be D(i), D(i-1) their respective distances to the vertex. Talk:Log-periodic antenna - Wikipedia, the free encyclopedia I've not checked it, but at first glance it looks like I've seen in books before, where there is a constant ratio in length of two adjacent elements and the same constant ratio in the spacing between two adjacent elements. But the talk page actually has some useful information about the design. I don't believe you can optimise for bandwidth.īTW, I just looked up log periodic on Wikipedia and as usual with almost any antenna topic, it is written by radio hams and is done very poorly (BTW, I'm a ham myself, G8WRB). Unfortunately, MMANA-GAL's optimiser is no good for wide band antennas. You can then get that into MMANA-GAL and analyse it.
"Design of log-periodic dipole antennas" by Peixeiro. There are some pretty simple formula around for designing log periodic antennas.
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But the full version is not worth the nearly 8000 Euros cost in my opinion. I know the full version has the facility to design a log periodic antenna, but I'm not sure about the trial version.
You could try the trial version of Antenna Magus.
You will have to find a method from elsewhere, and use that to calculate the lenghts and spacings of the elements, and then check the performance in MMANA-GAL. As such, you can't use it to design a log-periodic antenna. MMANA is not a design program, but an analysis program. Or does anyone have a file LPDA in MMANA software for my reference.
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Does anyone can explain how to make a LPDA antenna in MMANA?