Re: NEC-LIST: 4NEC2 for larger segments

You'll find that NEC4 runs a lot faster than NEC2 (at least that's my
casual perception). I think it's because the code is structured (and
compiled) in a way more suited to modern configurations of PCs.

The other thing to think about is that the single precision version of NEC4
is as accurate, if not more so, than the double precision NEC2. However,
I've also found that the run time difference between single and double is
very small, at least on smaller models (<1000 segments).

More time is spent in overhead functions(reading/writing files, building
the matrix, etc.) than in the actual computation.

At 09:28 AM 4/25/2005, Carrigan, Ken wrote:
>Arie,
>Thanks! Works nice now. Downloaded all the compiled runtimes and placed
>them into the exe directory. Worked out real nice, it automatically used
>the 3000 segment exe. (one problem that keep popping up is "wire @ zero
>height not 'connected' to ground (screen)". I can't seem to find this? I
>have a 'wall' that connects to ground, and 3 legs of a table which
>connects also to a wall. Legs go to '0' Z.??
>
>Now one more question. I want to run a 'sweep' from say 2MHz to 100MHz
>in a log type step. Say 2,6,10,30,60,100. How do I setup an automatic
>run of frequencies and also use a GUI visualizer to run through each
>frequency? Or do I have to do each manually?
>
>Thanks! Nice GUI tool! Thinking next of getting license for nec4.
>v/r
>Ken Carrigan
>
> >-----Original Message-----
> >From: 4nec2_at_gmx.net [mailto:4nec2_at_gmx.net]
> >Sent: Monday, April 25, 2005 4:28 AM
> >To: Carrigan, Ken; nec-list_at_robomod.net
> >Subject: Re: NEC-LIST: 4NEC2 for larger segments
>
> >Just place the exe files in your ..\4nec2\exe folder, and if
> >all is OK 4nec2 should automatically select/use the correct exe file.
> >
> >
> >
>
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>NEC-List_at_robomod.net
>http://www.robomod.net/mailman/listinfo/nec-list

James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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