4nec2\exe” folder, in your Word or Wordpad text editor. Other recommended sources for NEC related informations are the Nec-2 and Nec-4 user-manuals and . 4NEC2 is a freeware antenna simulation software program. The program can be used to model an antenna, and then determine through. Antenna Modeling With 4NEC2. Presented to HOTARC. By Craig Weixelbaum. May 22, Basic Modeling Approach using 4Nec2. The goals of this
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EA4FSIT1 :: Notes on antenna simulation using NEC-2
If you want to change editors you can do that from the main menu options as well. An elevation of 90 degrees will correspond to the perpendicular to the ground plane. The method of the moments [Ref.
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The 4NEC2 software is now hosted at http: Hats off to Arie Voors for this wonderful tool! The horizontal wires cannot touch the ground. It’s the most fun you can have without laughing! Get the optimum final value performing the convergency test shown if the next section.
The azimuth angles are measured clockwise from the Y axis towards the X axis.
W8IO Antenna Site – TANT and 4NEC2
IX The ability to read. American Radio Relay League. I built it, installed it and using the AIM C analyzer was able to verify the design. In every case apart from the free space, it is necessary to take into account the diameter of the wires: The X axis will be used for the front-to-back direction.
Antennex Monthly Columns – Antenna Modeling The average gain test is an useful tool to check the validity of a model and it is available in practically all the programs implementing NEC Length of the segments.
Expect a little learning curve; once you get the hang of it the interface is actually quite intuitive.
EZNEC is very easy to use and gives great results, especially for simple verticals and dipoles. In models of those characteristics it is advisable to perform the AGT test see section 7.
If you want to edit the antenna, press the open book icon to get into the editor. It looked complicated, but when I played with it for a while, it is actually pretty simple. It shows you 3 dimensional views if you want and gives great graphs. One wire must have at least segments per each semi-wavelength [Ref.
EA4FSI-28T1 – Technical Articles
Results of the average gain test in a 4Nec2 model. The segments will have a length Lswhich may be specified by the user or computed automatically by some of the programs, a process named autosegmentation. It took 24 iterations in about 4 seconds. Email Subscription You are not subscribed to this review. NEC-2 is not adequate to model small size loop antennas perimeter lower than 0. In addition to being a really useful 4nex2, it is fun to watch the 3-D display morph as the optimizer steps through the design possibilities.
With the optimization functions I could find the best SWR and launch angles for the geometries.
Today, I designed and optimized a 3-element Moxon-like wire beam to hang manuaal from the trees. If the model includes ground, it will be located in the XY plane. Putzing mqnual it has filled many binders and files.
The optimizer is very powerful, but it takes a little experimentation to become familiar. It is advisable for the distance between them to be at least several wire diameters as well [Ref.
Reviews Summary for 4NEC2 freeware antenna modeller and optimizer. Geometry of the models. Note that some of the rules are not applicable to later versions of the algorithm NEC3 and NEC-44ndc2 are more advanced and whose code is not available to the public. Those notes are a collection of advices and rules of design to perform simulations of antennas with programs based on the NEC-2 algorithm. In the case of wideband or multiband antennasrepeat the convergency test in a representative set of frequencies within all the working band of the antenna.