4nec2 – NEC based antenna modeler and optimizer by Arie Voors 13 - July - 2008
Posted by k9zw in K9ZW Learned.Tags: Antenna Modeling, Arie Voors, K9ZW
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An opportunity to run NEC2 Antenna Modeling without buying a commercial program or tracking down an archive of a long unsupported program:
4nec2 – NEC based antenna modeler and optimizer by Arie Voors
4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.
When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced. With the included Optimizer and Sweeper one is able to optimize antenna- and/or other environment-variables for Gain, resonance, SWR, efficiency and/or F/B, F/R-ratio. With the sweeper one is able to graphically display the effect of changing one or more of these variables for a specified range of values/frequencies.
For the starting modeler a graphically based 3D geometry-editor is included which requires no additional NEC knowledge while still enabling you to create and visualize and compare current-distribution, far/near-field patterns and Gain/SWR charts. More experienced modelers can use the gradient style and/or the genetic algorithm based optimizers to improve their designs.
Check it out!
73
Steve
K9ZW
Dayton Hamvention 2008 Follow-Up Report No. 11 – EZNEC Antenna Modeling 23 - June - 2008
Posted by k9zw in Amateur Radio, K9ZW Learned.Tags: Antenna Modeling, EZNEC, K9ZW, NEC2, W7EL
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I’ve been long interested in Antenna Modeling, and had started using EZNEC-ARRL as part of the ARRL CCE Antenna Modeling Course.
As I recently wrote about, I’ve also been using CocoaNEC on a Mac.
In both cases I have been approaching program limitations with some of the full-station modeling I have been trying.
EZNEC Version 5.0+ seemed to be the best fit for the modeling projects I am attempting and after discussion with Roy Lewallen W7EL I took the plunge & bought his latest version.
One must remember that NEC2 itself is limited and no “shell” surrounding the NEC2 core can overcome those minor limitations.
From Roy W7EL’s website:
The best way to get acquainted with EZNEC is to download the free demo program. It’s a complete EZNEC program except limited in the complexity of antenna it can analyze. With it, you’ll quickly learn what EZNEC can — and can’t — do for you.
ARRL has version 4.0-arrl included with the ARRL Antenna Book as well.
Now it is up to me to make good use of this tool!
73
Steve
K9ZW
Bruce Array Antenna Modeling – cocoaNEC Version 21 - May - 2008
Posted by k9zw in Amateur Radio, K9ZW Learned.Tags: Antenna Modeling, Bruce Array, K9ZW, W9EVT, WI-001L
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Working at modeling the new Bruce Array for Washington Island
Here are PDF files of the various outputs from my first efforts in cocaoNEC:
73
Steve
K9ZW
NEC2 Antenna Modeling for Apple Mac OS-X – cocoaNEC 2.0 by W7AY 9 - December - 2007
Posted by k9zw in Amateur Radio, K9ZW Just Rambled, K9ZW Recommends.Tags: Antenna Modeling, cocoaNEC, K9ZW, NEC2, NEC2c, W7AY
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Kok Chen W7AY has again blessed the Apple Mac OS-X using radio amateur with his expertise.
This time it is a wonderful implementation of the NEC2 (actually the C version called NEC2c) antenna modeling engine with input and output interfaces for the Apple.
cocoaNEC 2.0 has the makings of one of those applications that now being available may help another whole segment of the amateur community move over to OS-X.
click on graphic to enlarge screen shots
I’ve run just a few simple models so far, but I’m planning on giving cocoaNEC a good workout modeling the Bruce Array Project this winter.
Thank you Kok W7AY (who is also well know for bringing digital modes to the OS-X world with cocoaModem).
73
Steve
K9ZW
