| "John Smith" wrote in message
| ...
| On 8/19/2010 10:32 AM, wrote:
|| From......: "Bill
|| Newsgroups: sci.physics.electromag
|| Sent......: Wednesday, August 18, 2010 10:44 PM
|| Subject...: vemsa3d 1.1 - a floss visual em simulator
|| for 3d antennas
||
|| wrote in message ...
|| -
|| ...
||
|| How does this work differ from NEC Numeric Electromagnetic Code for antenna
|| analysis?
||
|| Bill Miller
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|
| Dear Mr. Miller,
|
| VEMSA3D can not work differently, because it is based
| on the same theoretical method as NEC does, that is on
| the Method of Moments.
|
| However, since each of these numerical applications use
| a different basis of the current function space and since
| their corresponding computer programs use unavoidably
| finite linear combinations of them, in general, they
| produce different results.
|
| To be specific, the two bases details are included in the
| following:
|
| VEMSA3D current basis:
| J. H. Rischmond, Radiation and Scattering by Thin-Wire
| Structues in the Complex Freqeuncy Domain, (15), p.6
| http://tinyurl.com/24zwycy
|
| NEC current basis:
| G. J. Burke, A. G. Poggio
| Numerical Electromagnetics Code - Method of Moments
| Equation (20), p. 11
| http://www.si-list.net/NEC_Archives/nec2prt1.pdf
|
| Regards,
|
| Petros Zimourtopoulos
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|
| I like how everyone ignores the elephant in the room, thought
| I would keep quite, sit back and see if anyone noticed the
| elephant stepping on their foot--case of numb feet I guess.
|
| So: What about MMANA-GAL. MMANA-GAL is about an exact
| work-a-like as you can get to NEC. Is free, has no
| limitations in software, etc. Are there any advantages to
| your program? Accuracy?
|
| Regards,
| JS
|
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Hello, again, JS!

For MMANA-GAL, I just took a look at:
http://mmhamsoft.amateur-radio.ca/pages/mmana-gal.php

where you can also read that, according to its developers,
this application is a descendant of MININEC, that is of NEC.
Therefore, there is no need to add nothing more on what already
written in some previous articles of this thread about VEMSA3D
and NEC.

Furthermore, I also just took a look at:
http://dl2kq.de/promm/

where you can read too that its developers clearly exhibit its
license and capabilities limitations. Therefore, there is also
no need to add nothing more on what they already wrote -not to
mention what it is lengthy said about software pattents and usage
restrictions in this tread.

Finally, the accuracy issue is also has been exhausted in
yesterday article:

| Sent......: Sunday, August 22, 2010 9:38 PM
| Newsgroups: sci.physics.electromag,rec.radio.amateur.antenna
| Subject...: vemsa3d 1.1 - a floss visual em simulator for
| 3d antennas
| From......:

so I have also nothing to add.

Well, after all, it seems that we only forgot to mention the
name of that elephant in the room -perhpas because its
advantageous name is /F/L/O/S/S/.

Best regards,

pez