On 6/9/12 6:50 PM, David Kirkby wrote:
On 10 June 2012 01:39, Jim Lux<jim...@earthlink.net> wrote:
NEC can do a pretty good job on a helix, and it's free. I like 4nec2 as a
front end.
I've never tried NEC on them. I quite like MMANA-GAL myself. But it
only supports NEC2.
4nec2 does both NEC2 and NEC4
NEC will also do a patch: Model it as a grid of wires using the guideline of
"surface area of wire is spacing between wires".. that is, if you have wires
on a 1cm grid, then the wire diameter should be 1/pi cm. Even if you thin
the wires out (so you can get them closer to the ground plane), it still
works pretty well.
I found a paper about that rule with NEC, and it basically showed it
was not a good of thumb. I just can't think where it is (what
computer, what directory).
funny.. the rule of thumb comes from Jerry Burke (one of the NEC authors)
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