NEC Tools for Import & Export by
Paul McMahon VK3DIP
Some test results of
the included MININEC port
I started building NEC-TIE as a tool to trial import from various antenna
description file formats to YagiCAD. The intent was just to save the tedium and
possible errors of manual transcription from things like the yagi description
files included with the ARRL antenna handbook. Anyway it soon got bigger than
that and while I have now included NEC-TIE in the YagiCAD distribution, (itís
installed just as an exe in the normal YagiCAD directory but it can be
anywhere, conversely if there is a later version here you can just copy it over
the top of the old version) the thought was it may be useful to people
standalone or in conjunction with other computer antenna programs. So
here it is.
∑ Import .NEC files,
either standard NEC2 or 4NEC2 extensions. (See known limitations)
∑ Import .YW and .YAG
∑ Import .ANT (MN and
AO extensions) files . (See known limitations)
∑ View/Edit data for
wires, loads, sources, and grounds
∑ View data Geometry in
a graphical 3d viewer
∑ Convert data to an
equivalent monotaper Yagi (See known limitations)
∑ Export to YagiCAD
∑ Export to standard
∑ Run data against a
native double precision port of MiniNEC3
∑ View MiniNEC far
field results as a graphical pattern plot.
∑ Early days, version 1
of software there will be bugs, if you find any please let me know.
∑ For .NEC files
currently no support of GA,GF,GH,GM,GR,GX,SP,SM cards. The imports will try to
ignore these but sometimes ( eg. if there is a load that references a wire
defined in a GH) this will show up as an error.
∑ Also currently only
EX type 0.
∑ In AO style .ant
files no support for rotate command.
∑ Editors biased
towards what YagiCAD/MiniNEC can support.
∑ For conversion to
monotaper or for export to YagiCAD format the design must have:
o All wires parallel (can be X or Y axis
aligned, but will end up Y)
o Symmetry about either the X or Y axis
o All wires at same height (Z)
o A single source
∑ Export to standard
NEC2 format, see above file limitations.
Initial released version
1.03 of NEC-TIE exe (Zipped)
1.1.01 of NEC-TIE exe (Zipped)
V220.127.116.11 Release notes
∑ Multiple bug fixes.
∑ Added all NEC style loads to included MiniNEC ie. LD0 to LD5 which
includes converted 4nec2 LD6 and LD7
∑ Loads and load comments now saved to exported .nec files
1.5.01 of NEC-TIE exe (Zipped)
V18.104.22.168 Release notes
∑ Multiple bug fixes/Including Mininec Load handling/Rearranged main screen.
∑ Added EZNEC file import capability