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Show all reviews of the 4nec2 freeware antenna modeller and optimizer
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of the 4nec2 freeware antenna modeller and optimizer.
Mar 14, 2013 18:44
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Time owned: more than 12 months
The 4NEC2 software is now hosted at http://www.qsl.net/4nec2/
4NEC2 is an extremely powerful antenna modeling program based on NEC2 code. 4NEC2 is my tool of choice for antenna modeling.
The main attraction of 4NEC2 is the graphical entry of antenna models. I find it far faster for initial entry than X-Y-Z entry of coordinates. A spreadsheet also allows initial entry or adjustments after initial entry. It has tools to auto generate grids, radials, and some quite complex geometries, provides scaling, translation, and rotation of antennas and subsets, replications of antenna subsets, and many other aids far too numerous to list.
It provides graphical display of antenna currents and phase, and allows selecting segments for numerical current display in complex format. This is useful for computing mutual impedance for example.
Additionally, there is a hand-optimized multithreaded version of the NEC2 engine for 4NEC2 called NEC2/MP that speeds up the execution by 2x to 10x depending on what kind of SSE instruction set your computer has. It's available from http://users.otenet.gr/~jmsp/
it just replaces the various nec2dxs???.exe files and leaves the rest of the 4NEC2 front-end alone.
The optimizer is very powerful, but it takes a little experimentation to become familiar. By proper definition of dimension variables, it is even possible to optimize while enforcing symmetry for example.
Highly recommended. Expect a little learning curve; once you get the hang of it the interface is actually quite intuitive. The 3d display engine is hands-down superior to anything else I've seen.
Hats off to Arie Voors for this wonderful tool!
-- Tom, N5EG
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