The plotting of current and patterns were designed to be rather straight 
forward.  The package can handle up to about 160 unknowns in DOS. 

program and documentation provided by author Dr. William A. Davis <>

Further info is available at: http://www.qsl.net/ua3avr/

contributed by Dimitry Fedorov, UA3AVR (http://www.qsl.net/ua3avr)

• Cleaned up and reworked patch subdivision.
• Fixed a bug in interpolate() caused by not having the precalculated data static. Thanks to Neokolis for pointing this out.
• Cleaned up rom2() and rechecked program flow.

* Got LAPACK going. There is generally a 100% speedup. However the LAPACK 
routines sometimes
produce different answers to the built in LU decomposition routine? Therefore 
LAPACK LU decompositions is still not included in the default build.
* Fixed up a re-initialization problem in the temporary geometry files.
* Several Improved testharness code.
* Moved temporary geometry into the geometry class. Set this up in the 
geometry_complete() method.
* Added #include  to misc.cpp
* Ignore Radiation Pattern Polarization angles in the testharness where the 
power level is -999 dB. These have no physical meaning and are often 
different with LAPACK.

Summary of Changes

• Moved the geometry parsing to a separate file. Will move to PCCTS, and an API for specifying geometry.
• Improved command-line syntax and handling of output file names.
• Moved to a safe_array for all arrays.
• Fixed many index-out-of bounds errors.
• Created a testharness (nec2diff).
• Introduced a typedef for nec_complex.
• Modified output to be compatable with xnecview
• Moved all graph output to separate class.
• Moved Sommerfield Calclations to separate class.
• Cleaned up complex calculations
• Removed all compiler warnings [except one that indicates a piece of code I don't understand].
• Renamed variables.
• Moved a lot of #defines into local code.
• Put in some code to allow the incident field amplitude to be specified when using an EX card (like NEC 4).

In the very near future, nec2++ will depend on the ATLAS. To install this use the following commands under DEBIAN linux (http://www.debian.org).

apt-get install atlas3-base atlas3-headers atlas3-base-dev
      apt-get install refblas3-dev lapack3-dev lapack3-doc

Notice: Several users have reported problems with nec2d_me and
nec2d_lapack. These problems were related to inaccurate results
when the NE card was in the input deck and software crashes when
an LD (load) card was present. The author's e-mail address appears
to be no longer active.

A Win32 executable targeted to the PentiumPro or later IA 32 machine and using allocatable arrays so that one program handles all structure geometry sizes. The folder also has a SOMNEC executable and the modified source code (Fortran 90). 

contributed by Joe Lastovka  ()

Notice: Several users have reported problems with nec2d_me and
nec2d_lapack. These problems were related to inaccurate results
when the NE card was in the input deck and software crashes when
an LD (load) card was present. The author's e-mail address appears
to be no longer active.

Same as NEC2D_Me except that it uses the Intel MKL LAPACK routines to factor and solve the NEC matrix equations. Pentium III only. About 20 times faster on matrix factor and solve at large matrix sizes. 

contributed by Joe Lastovka  ()

nec2dx

Uploaded 4/22/2002

nec2dx is a double-precision code compiled with GNU g77. Runs as a 32-bit application in a DOS console window 
under Windows 95, 98, NT, 2000, and XP. 

These nec2dx executables have been generated from source code modified to allow 300 separate LD cards as opposed to the normal 30. Also modified with  FACTR and SOLVE routines modified to support non-transposed matrices for faster runtime performance 

Executables have been compiled for the following number of segments: 

                                          500  (nec2dx500.zip) 
                                        1500  (nec2dx1500.zip) 
                                        3000  (nec2dx3000.zip) 
                                        5000  (nec2dx5000.zip) 

The companion somnec2d executable has also been compiled with g77 and generates the 
nec2d.nec files necessary to utilize the Sommerfield-Norton ground in NEC2. 

These executables are made available for BETA testing. If you encounter any problems with 
these, please report the bugs. 

modified and compiled by Ray Anderson  WB6TPU  <>

File nec2dx_src.zip contains the source code used to generate the nec2dx family of executables. 
The file contains: nec2dx.f, NEC2DPAR.INC, somnec2d.for, and compilation instructions 
for use with GNU g77. 

The code has been modified to allow 300 LD cards as opposed to the standard 30. Also modified 
to use non-transposed matrices in the FACTR and SOLVE routines for faster runtime. 

Ray Anderson WB6TPU  <>

Now executes faster due to improved compile time optimization

Nec2dxs.zip contains executables (and source code) for a version of NEC2 that has the 
Somnec interpolation table generator integrated into the NEC2 executable. One of 
the advantages of this arrangement is that a new set of interpolation values is 
generated for each simulation frequency point. This leads to higher accuracy simulations 
when the effect of the ground is included. Compiled with GNU g77 and based on the same 
code used to compile the nec2dx*** series of executables. 

Works under Win 95/98/Me/NT4/2000/XP as a 32 bit windows application from a 
DOS console window. 
 
 

Contributed by the author Arie,  <> Neede, The Netherlands] 

contributed by Joe Lastovka  ()

contributed by Joe Lastovka  ()

from Barry Newberger ()

from Barry Newberger ()

This binary was produced on a Power Macintosh G4/400 running OS X Public Beta 

This binary was compiled from the NEC2 C source. The C source was obtained from 
Raymond Anderson's Unofficial Numerical Electromagnetic Code (NEC) Achive. 
(http://www.qsl.net/wb6tpu/swindex.html). The source was originally from the 
ucsd.edu archives, and was converted from FORTRAN to C using f2c, according to 
the Unofficial Archives. 

Some modifications to the original Makefile and sources were necessary for the 
sources to compile. I could not get the sources to compile using the supplied 
f2c.h headers, so the f2c library from Bell Labs (netlib.bell-labs.com) was 
installed and linked to produce the final binary. Typographical errors in the 
Makefile and some sources which prevented compilation and linking were also 
corrected. 

The gzipped tar file contains the executable, a README file, diffs to document source  changes and several example input files. 

contributed by Derwood Eadie  KG4EFO () 21 Nov. 2000

This version of NEC2 uses 32 bit reals and compiles well with 
Microsoft Fortran for Powerstations. I obtained it from 
ftp.ucsd.edu /hamradio/NEC and have added the subroutine SECNDS 
for PC:s. The NEC-code at that site contained a nasty bug in a 
Hollerith string that is corrected. The subroutine ENF is commented 
away since it is not needed on PC:s. A declaration that changed a 
common area is also corrected. The resulting executable has 
been checked against a few testcases and seems to give correct 
results. The original notes and doc files is not changed. 

SM5IUF /Gunnar Isaksson 
 
 

nec-pc NEC2D executable compiled to run on PC 386/486 Compiled with 32-bit Lahey Fortran. Requires 80x87 math coprocessor. File contains 4 versions compiled for different maximum numbers of segments and hence require differents amounts of memory Includes SOMNEC2D.EXE Sommerfeld parameter generator. 

Name of    Max number  Approximate  
executable of segm.    memory use (MB) 
- - - - - - - - - - - - - - - - - - - - - - 
NEC2D.EXE       256        1.5 (*)
NEC2D512.EXE    512        5 
NEC2D960.EXE    960       16 
NEC2D1k4.EXE   1392       32 

This zip-file is a supplement to nec-pc.zip. It contains larger versions of the NEC executable, for problems with more than 1392 segments. They can only be used together with NEC2D.EXE, from nec-pc.zip. 

Description of the NEC2D files: -------------------------------------------------------------------------- 

EXAMPLE.DAT is an input file with several examples. These can be tested in one single run by giving this file as input. 

NEC2D***.EXE Several working version of the NEC program. Differences:

 
Name of      Max number   Approximate
executable   of segm.     memory use (MB)

    - - - - - - - - - - - - - - - - - - - - - -
             /    NEC2D.EXE        256         1.5 (*)
 These are  |     NEC2D512.EXE     512         5 
 found in   |     NEC2D960.EXE     960        16 
 nec-pc.zip |     NEC2D1K4.EXE    1392        32 
             \    NEC2D1K9.EXE    1950        60 
             /    NEC2D2K8.EXE    2800       122 
These files |     NEC2D4K.EXE     4000       247 
  are in    |     NEC2D5K7.EXE    5700       500 
nec-pc-x.zip|     NEC2D8K1.EXE    8100      1006
             \    NEC2D11K.EXE   11000      1852

*.FOR, *.INC Files containing the Fortran source code. In nec-pc-x.zip -------------------------------------------------------------------------- 

Jos Bergervoet,

nec2sx

Fortran 77 source code of single-precision NEC2 modified with  FACTR and SOLVE routines modified to support non-transposed matrices for faster runtime performance. File nec2sx.tar contains the Fortran source code and simple compilation directions. 

File nec2sx is a compiled SUN Solaris executable that also includes support for multithreaded execution. See the documentation in the source code tar file for setting up the multithreaded environment variable. This executable is compiled to support 1500 segments. Compiled on Solaris 2.5.1, also tested on Solaris 7 and 8 
 
 

contributed by Ray Anderson WB6TPU  <>

nec2dx

Fortran 77 source code of  double-precision NEC2 modified with  FACTR and SOLVE routines modified to support non-transposed matrices for faster runtime performance. File nec2dx.tar contains the Fortran source code and simple compilation directions. 

File nec2dx is a compiled SUN Solaris executable that also includes support for multithreaded execution. See the documentation in the source code tar file for setting up the multithreaded environment variable. This executable is compiled to support 1500 segments. Compiled on Solaris 2.5.1, also tested on Solaris 7 and 8 

contributed by Ray Anderson WB6TPU  <>

YGO2 is a FREEWARE progarm. It may be freely copied and distributed, but ONLY as long as there is no cost to the recipient. 

Unlike the original release of YGO, this version allows the user to optimize the array at up to 15 different frequencies, and to specify a different driven element (if desired) at each frequency. Unexcited DEs are assumed to be terminated in the feed system characteristic imped- ance. 

YGO2 (YAGI GENETIC OPTIMIZER II) designs optimized Yagi antennas using one of the most recent and powerful techniques in applied electro- magnetics: a genetic algorithm. A genetic algorithm mimics natural sel- ection ("survival of the fittest") by creating generations of Yagi designs in which the best designs ("individuals") pass their design parameters ("genes") onto the next generation in such a way that better and better antennas are the result. GA optimizers can produce remarkable results not achievable with any other design technique. Genetic algorithms are superior to deterministic optimzers, and they are easily implemented on a PC. 

YGO2 is user-friendly and easy to run. All GA parameters are changed by editing a single set-up file. The user can specify popu- lation size, number of generations, antenna figure-of-merit, and all other parameters needed by the GA. The Yagi's performance is computed using NEC-2D, the state-of-the-art Numerical Electromagnetics Code (double precision) developed at Lawrence Livermore National Laboratory. 

When YGO2 has completed its optimization, the radiation pattern of the best antenna is plotted on screen. A separate plotting utility allows the user to view radiation patterns for other top designs on a generation- by-generation basis. One of the GA's most attractive features is that, instead of producing only one "best" design, it produces groups of designs that achieve similar performance. The designer can then select from these groups the Yagi that best meets the requirements. 

To install YGO2, copy the file INSTYGO2.EXE into the directory on your hard drive that you will use for YGO2. YGO2 files are created by executing  INSTYGO2.EXE, which is a self-extracting EXE file. If you have a previous version of YGO2, simply overwrite all files of the same name. 

Be sure to check the README.TXT and YAGI_GA.TXT files for inform- ation on setting up a YGO2 run. The file NEC2INFO.TXT contains information on creating various size NEC-2D executables. Any changes to YGO2 will be described in the file UPDATE.TXT. Please read UPDATE.TXT if it is present. 

YGO2 is a DOS program that must be run under MS or PC DOS (ver.3.3 or higher), Compaq DOS (ver.3.31 or higher), or in a DOS window under MS Windows 3.0 or higher. YGO2 also requires an 80386/87 math coprocessor or higher CPU and about 1 MB of RAM (depending on the model size). 

Contributed by Phadean Engineering <> USA, tel. >, fax )

 YGO3 (Yagi Genetic Optimizer, Ver. 3) is a real-valued genetic 
algorithm (GA) that designs optimized Yagi-Uda arrays by maximizing a 
user-specified figure-of-merit (FoM).  Antenna designs created by YGO3 
are modeled by NEC-2D (Numerical Electromagnetics Code, Ver. 2, double 
precision), a recognized standard for modeling wire antennas developed 
at Lawrence Livermore National Laboratory.  YGO3 handles up to 150 ele- 
ment arrays at up to 50 frequencies.  The GA includes state-of-the-art 
techniques such as quadratic interpolation, auto-grooming, coefficient 
perturbation, coefficient activation, several selection methods, and two 
crossover methods.  YGO3 is a DOS program which may be run in a DOS win- 
dow under the Windows operating system. 

 YGO3 is a FREEWARE program.  It may be copied and distributed 
without restriction as long as there is no cost or charge of any kind, 
including "tie-in" costs, to the recipient.  YGO3 has been developed and 
is distributed as a service to the amateur radio community.  Please email 
comments, suggestions, or questions to: . 

 YGO3 is installed by executing the self-extracting file 
YGO3INST.EXE in the default directory, usually C:\YGO3.  All necessary 
files are created, including several versions of NEC-2D that allow for 
models with 28 to 1500 segments.  Please read the file YGO3_MAN.TXT for 
setup and operating instructions. 

 YGO3 is the successor program to YGO2, a binary-coded genetic 
algorithm for optimizing Yagi arrays.  Because YGO3 includes several 
improvements, designers using YGO2 should upgrade to the newer real-valued 
GA.

Contributed by Phadean Engineering <> USA,
tel. , fax

Changes with version 5.3.9
Incorporates several minor bug fixes.

Changes with version 5.3.8
Incorporates  bug fixes to alleviate problem with saving files without
extension.

It is  now possible to specify insulated wires using an optional LD7
type loading.

Changes with version 5.3.7
Incorporates various minor enhancements and bug fixes.

Changes with version 5.3.5
Incorporates various minor enhancements and bug fixes.

Changes with version 5.3.4
Incorporates miscellaneous bug fixes for problems found in earlier rev.

Changes with version 5.3.3
Incorporated several minor bug fixes and one  major bug fix associated with
Windows 2000. Several minor enhancements added.

Note: when installing, be sure to first install the 4nec2v533 package before
installing the 4nec2X533 package. (These are to be installed in the same directory)

Changes with version 5.3.2
Minor bug fixes incorporated

Changes with version 5.3
Supplementary DLL and DirectX files files included in install file.
Drag and Draw support added for CM, GW, GS, FR, TL and GN cards
in the antenna geometry editor. Ability to use non-metric units added.

Changes with version 5.2
Added ability to display surface patches. Minor bug fixes implemented.
 

Changes with version 5.1

- Additional optimizer based on genetic algorithms added. 
- Optimization for both single-frequency or band-of-frequencies. 
- More general and consistent data-entry when generating nec-2 output. 
- Pre 4.3 version support for raw nec-2 input re-enabled. 

The new 5.1 4nec2X version also enables real-life structure-geometry 
and far- or near-field pattern visualization. The use of DirextX based 
hardware graphics-acceleration delivers you fast rotating, zooming 
and moving of the more complex structures or patterns. 
(Click here to view some sample  screendumps)
To use this eXtended version, please download both the 4nec2v**.zip 
and 4nec2X**.zip files, and read the _ReadMeFirst.txt file for further 
instructions. 

To support all those not having state-of-the art computer systems or 
uncommon graphics hardware the standard 4nec2.exe is also available. 

4nec2v51.zip  Basic 4nec2 installation (updated 01/10/03)
4nec2X51.zip  Addition for DirectX based version (updated 01/10/03)
 

4nec2 is a user-friendly layer around the standard nec-2 engine. 
The 4nec2 package contains all the software to specify, calculate, 
evaluate and optimise your antenna-system.  It also incorporates the 
nec2dxs**** executables that integrates  NEC2 and SOMNEC into 
the same executable. 
Some of the default 4nec2 capabilities: 

- 2D and 3D geometry-structure, current, far- and near-field display 
- Both a 'hill-climbing' and a Genetic-algorithm based optimizer included. 
- Capable of modelling nec-2 files up to 11.000 segments 
- Compare up to 5 different far-field plots in one view 
- SWR, Gain, F/B, F/R, Z-in, X-in frequency-sweep graphs 
- Optional use of variables, constants or equations in nec-2 input file 
- Flexible antenna evaluator and structure validator 
- Support to use current-sources within nec-2 definition 
- Smith-chart display with integrated line-length calculator 
- VOACAP, ICEPAC, REC533 type-13 and -14 antenna-file generation. 
- Automatic area-coverage evaluation and viewing using VOACAP/ICEPAC. 
- Geometry-builder include in the package 
 

Changes with version 5.0

- Real-life 3D viewer added using hardware-acceleration 
- Nec2dXS for increase number of LD, EX and NT/TL cards. 
- Max number of near/far-field increased to 200000 
 
 
 

Contributed by the author Arie, <> 

from Roy Lewallen W7EL

(contributed by the author Roger Cox WB0DGF) <>

MultiNEC is a combination Excel and Visual Basic program that can automate
the repetitive steps of antenna modeling.  You can build your model via the
user interface or import existing EZNEC, NEC, Antenna Model (Teri Software),
ELNEC, MMANA, AO, or Nec/Wires format models.  MultiNEC can then calculate
the results for a given scenario or can run multiple test cases while
automatically changing the model between runs.  Output is available in
tabular numeric format and in several different chart and plot formats.

You can also show the expected propagation performance of your antenna.
Propagation predictions are made via a simplified interface to the VOACAP
engine and may be presented on both area coverage maps and point-to-point
plots.  You can animate these maps and plots to easily see how the
propagation might change given varying ionospheric conditions or as a result
of changes to the model.

MultiNEC can be used by itself if desired or it can be used to extend the
capabilities of other antenna modeling programs.  For more information and
downloadable user manuals see www.qsl.net/ac6la/.  Requires Excel 97 or
later.

Important:  You must allow Excel macros to be enabled or none of the
MultiNEC buttons will work.  If you click a button and see small white
squares appear around the perimeter of the button face, as opposed to seeing
the expected button response, it means that you must make an easy, one-time
change to your Excel settings.  Please see the ReadMe file for more details.

Submitted by the author Dan Maguire  AC6LA ().

necpost2.bas is Nec-post-processor 2.1 developed by Agostino Rolando . The original file was necpostproc.bas by J. Boyer. 

I have taken Necpostproc.bas and nov.bas and mixed them together to display 2d - 3d radiation patterns and current distribution along the antenna . 

It works better with vertical radiators. 

This 2.1 version has eliminated some little bugs of earlier 2.0 . 

Note that ,in order to draw a true 3d radiation pattern, the antenna must be arranged as to have the feed point just in (0,0,0) coordinates. 

For yagi design, I found a good agreement with yagimax 3.0 program by Lew Gordon. 

Here you find : 

nec2pc.exe - nec2 for pc. Requires 486dx or better and as much memory as the number of segments you use for antenna's description. 

niv.exe - nec input viewer. Shows input structure descriptor files *.nec. You can evidentiate errors in designing your antenna before nec2pc processing. 

nov.exe - nec output viewer . Shows the distribution of currents along the antenna (*.out files). 

necpost2.exe - nec postprocessor . Shows radiation patterns and current distrib. for *.out files. 

A few sources examples are included. 

NOTE : To know how to compile input descriptor files, see Nec User's Guide in http://www.traveller.com/~richesop/nec/ , available in pdf format. 

Have a good work ! 

Agostino Rolando E-mail:

ncsarsim.zip  contains routines to use NEC to simulate synthetic
aperture radar imaging of a scene containing a target in some state of motion.
Various states of motion, including rectilinear translation, vibration,
and rotation, are considered, as well as superpositions of such
motions.

NCSARSIM is a program to control the operation of the method-of-moments
program NEC to simulate SAR imaging of a target that is moving in some
fashion.  (It can handle the case of no motion too.)

nec.exe version 2 is now available for download. 

This new version superceeds the earlier version of nec.exe. The new executable 
has been tested on Windows XP and uses the Windows 32 bit console program mode. 
The associated source code should also be easier to port to Unix or Linux where the 
obvious compiler of choice would be gcc. I would welcome feedback from anyone who 
anticipates compiling it for a Unix or Linux platform. 
-------------------------------------------------------- 

NEC.EXE an interface to SOMNEC data 

This utility (nec.exe) runs from the command shell (DOS prompt) and opens a NEC input file and determines if the Sommerfeld ground is used and obtains the frequency, K and sigma terms so it can locate or generate the appropriate SOMNEC interpolation grid before invoking one of the variants of NEC2D. This SOMNEC data is stored for future use; the user can specify the location of this data by setting the SOMNEC environment variable. 

NEC.EXE also determines the appropriate variant of NEC2D based on the number of in-core segments. The program requires nec2d512.exe, nec2d960.exe, nec2d1k4.exe, and RTM.EXE in the current directory or the PATH environment variable. 

Source code included (The program could also be recompiled on Unix afer some modifications.) 

(contibuted by the author Ralph Holland , VK1BRH <> 
< http://www.arising.com.au/people/Holland/Ralph/index.htm >

It allows: 

* To run nec2 passing the name of the file .nec 

* To visualize in X-windows radiation diagrams of antennas, 

* To display the main results as Gain, F/B, Z etc. 

* To produce Post Script files to be printed 

Requirements: 

Npp reqires yorick 1.4. (available from ftp://ftp-icf.llnl.gov/pub/Yorick/) 

If you wish recompile nec2 you need yaf77-1.3 

(provided by Pino Zollo I2KFX <>)

(contributed by Alexandre Kampouris)

(contributed by Alexandre Kampouris)

(from Unofficial NEC Home page  ttp://members.home.net/nec2/)

Good Luck on your antenna designs- Clyde Edgar WA6DCM 

from Clyde Edgar WA6DCM <> 

NVNEW

New Version uploaded 6/18/2004

NVNEW.ZIP contains an enhanced version of David de Schweinitz's NV
program. These enhancements are in NVNEW.BAS/NVNEW.EXE and include
support for GA, GH, GM, GX, and GR cards as well as support for VGA
graphics. It has the capability to print out (in monochrome) the
displayed NEC structure (see PRINT.NV) and to output a PCX file
(see PCX.NV), or as of 13 June 2004, a BMP file (see BMP.NV). Also as
of 13 June 2004, it will now handle NEC input files that store multiple
structures, displaying each structure one at time. It now also works
with NEC4 input files. The archive also contains a special version of
NVNEW--NVCOMP. It displays the geometry in a lefthanded coordinate system
(see NVCOMP.TXT).

Glenn Stumpff

On-line NEC2 manual at URL http://www.nec2.org
(in .html, .pdf, and .doc formats) 

also maintains links to other NEC resources

contributed by George Christianson <> 

contributed by George Christianson <> 

contributed by the author  Patrick Wintheiser  W0OPW  <>

from Dr. D.B. Davidson ( ) 

WireGrid for Windows (version 2.11) is the second release of this NEC pre-processor. WireGrid was developed by EM Software & Systems in collaboration with the University of Stellenbosch. 

(Note: the version on the this ftp site is enabled in the DEMO mode. It is fully functional but limited to 15 elements.) 

from Dr. F.J.C. Meyer ( )

This is a suite of programs written in BLT - an extension of TCL/TK - which are intended to assist in visualizing antennas. The package is intended to provide windows which show both antenna patterns and antenna configuration. An accompanying article in both LaTeX and PostScript form describes the process of designing a simple antenna using the system. 

The suite has been built under SCO 5.0.2 and SCO 5.0.4 (Free SCO), but should run under any system that can make the blt extension of tcl/tk work. (That should be the majority of systems on the planet.) 

(contributed by Bill Walker W5GFE , < >

 SYNOPSIS 

  Necview
  Azimuth  [filename]
  Elevation [filename]
  Wires

 DESCRIPTION 

These programs are written in Perl/Tk (version 5.005_2), 
and provide tools which can help to visualize antennas or analyze data 
which is produced by NEC2 - the antenna modeling program. 

The NEC2 program is commonly used by radio amateurs or professional 
antenna designers on Unix equipment to model antennas.  While NEC2 is quite 
versatile, the output of NEC2 is voluminous and difficult to read.  This suite of programs 
provides graphical depictions of NEC2 output. 

Azimuth provides three graphs of "horizontal" 
radiation patterns:  an ARRL-scaled polar 
plot, a linearly scaled polar plot, and a cartesian plot.  A "fact box" 
provides indication of -3 DB beam widths. 

Elevation provides similar information for vertical radiation 
patterns. 

Wires is a visualization tool which shows three views of the same 
antenna.  Views are provided for the "XY plane", the "YZ plane" and 
the "XZ plane". 

Necview borrows heavily from the "xnecview" program by 
P.T. de Boer (). 
 
 

Sample data files are included in each subdirectory. 

The W5GFE Antenna Toolkit is released 
under terms of the GNU Public License. 
 
 

 AUTHOR 

Bill Walker, W5GFE,

NEC.XLS 

Updated version VB1.10 (1/12/99) now online.
(6/27/02 set up for easier first time use)

NEC.XLS contains pages to handle the following topics: 

 1 INTRO 
 2 DECKMAKER 
 3 VIEWER 
 4 AUTO NEC 
 5 DISPLAY 
 6 ANALYSER 
 7 DIPOLE 4 STACK 
 8 DIPOLE 4 STACK(2) 
 9 FOLDED STACK 
 10 ROTATABLE FLATSTACK 
 11 TILTED DIPOLE 
 12 HELIX and MICRO LOOP 
 13 TAPERED HELIX and MICRO RING 
 14 ANTIPHASED HELIXES 
 15 LPDA 
 16 LPV  1 
 17 LPV  2 
 18 DISCONE 
 19 BIFILAR 
 20 SLOTTED RING 
 21 FOLDED DIPOLE 
 22 FRANKLIN 
 23 VERTICAL FRANKLIN 
 24 LAZY - H
 25 PARABOLIC YAGI 
 26 DIPOLE withPARABOLIC REFL. 
 27 YAGI MAKER 1 
 28 YAGI MAKER 2 
 29 LAUNCHER 
 30 CORNER REFLECTOR 
 31 STANDARD GAIN 
 32 DECK FILE INDEX 
  REVISION HISTORY 
 

AN ANTENNA MODELLING PROGRAM, INTEGRATING THE CONVENIENCE of EXCEL with the POWER of NEC 2 ...for experienced EXCEL users, with access to adequate computing power. 

Release 1.07A ,1/7/98. This version, released privately, has a restricted number of prepared antenna design sheets. The Workbook is not locked, with the intention that users may add their own antenna design sheets. No charge is made, nor any responsibility accepted . 

WHAT NEC.XLS DOES The series of sheets in NEC.XLS allow you to automate most of the common tasks associated with using a NEC 2 engine for modelling antennas, and tabulating the results. This program automates your entire antenna assessment. It will step through up to three design variables at a time , with increments as selected. Having incremented chosen variables, a NEC INPUT DECK is automatically built. This is fed to a NEC 2 engine automatically. The Output file from the NEC engine is then read by EXCEL, and a summary of gain, F/B, and antenna input impedance is produced. If desired, a Thumbnail plot for each design is produced. Finally, a table of results is available, which is sorted by a Figure of Merit based on your weightings. The program thus loops away, building and summarising design changes within your set parameters. 

(contributed by the author Peter Ward <> Bairnsdale, Victoria, Australia )

RF1, RF, RF3, RF4.xls (Release 5.00, 28/02/02) 
 These MICROSOFT EXCEL workbooks form a companion to the completely free automated NEC design 
package which is publically released on this site as XLNEC.ZIP, and contain practical modules for solving 
formula and chart related RF problems of interest to antenna builders. 
 The original RF1 and RF2 workbooks  have  been re-organised into four books of  appropriate groupings, errors 
corrected, and new sheets added. 
RF1.XLS contain propagation related worksheets. 
RF2.XLS brings spreadsheet assistance to impedance measurement and matching. 
RF3.XLS contains  pages related to antenna design and building. 
RF4.XLS solves many of the more general problems met in the RF workshop. 

. 
In particular, there are sheets that will help de-mystify these topics, and more! 
    ANTENNA GAIN CALCULATIONS 
    PATH BUDGETS 
    STUB CALCULATION and PLACEMENT 
    PHASE TILT 
    VSWR CALCS 
    BUILD MMIC IN-LINE AMPS .. that replicate the gain curves in the HP app notes. 
    BUILD BROADBAND DIRECTIONAL COUPLERS good to 1 gHz, for $20 
    IMPEDANCE MATCHING 
    POWER DIVIDERS 
    SLOTTED LINES 
    PATTERN TILT on COLINEARS 
    SLUG TRANSFORMERS/MATCHERS 
    IMPEDANCE CHARTING 
    MATCHING with IMPEDANCE CHARTS 
    CABLE LOSS CALCULATION for ANY CABLE 
    RETURN LOSS UNCERTAINTY 
    INDUCTOR and OP-AMP CALCS 
    RSSI CALIBRATION CURVES as a basis for ACCURATE RF MEASUREMENTS 
... and a couple of ring-ins. CYLINDER HEAD FLOWBENCH may interest some 
 The books contain macros. To relieve the fainthearted, they are verified against the latest PC-Cillin Signatures, and directly uploaded ONLY to the 'Unofficial NEC Archives' for your protection. The macro pages are unlocked, and I encourage modification and suggestion for improvement. 
 Please pay attention to README.RTF, which gives instruction for the correct setting up of Excel, and has been a matter of some frustration to many! 
 The material is offered freely to the users of 'The Unofficial Nec Archives' as an encouragement to those of you whose RF experience goes beyond just buying the 'latest and greatest'. It is my contribution to helping 'keep the dream alive'! 
 

.. As previously, absolutely free, from the workshop of 
                    Peter Ward, AX2VCI.  Bairnsdale, Victoria, Australia 
                     
 

(contributed by the author Pieter-Tjerk de Boer PA3FWM or )

The materials contained in this directory may be of some use to the 
amateur community.  They also represent a remarkable work of love 
and devotion on the part of XYL Ursel Kreh, wife to 
Hartmut Hans Kreh DL5SAY, who died in January 2001, aged 54. 

I offer them, through the courtesy of Frau Kreh, to the Amateur 
Community.  Please direct any correspondence to: 

        Bill Walker W5GFE 
         

        Professor and Chairman 
        Department of Computer Science 
        East Central University 
        Ada, Oklahoma