Date: Mon, 4 Jan 1999 01:58:04 +0000 (GMT)
From: Riley Williams <[EMAIL PROTECTED]>
Hi Hamish.
>> I know Fortran, but not NEC so...
>> 1. What is it?
>> 2. Where is it?
> I don't remember what the acronym stands for but it's
> basically an electromagnetics analysis program, good for
> evaluating antenna designs.
OK, that answers the first question. Anybody care to answer the second
question, then I can see about sorting it out...
The current version of NEC, NEC4, isn't available on the net. It's
obtained from Lawrence Livermore National Labs. To get it you have to
sign a license form and send in a fee. NEC4 is also under export
control.
NEC2 is also available, has less capability, but is not export
controlled.
In either case, I don't see how either of these programs can be
packaged as free software.
FYI, I've attached the standard ordering info.
73,
Chris K8SH
----------------------------------------------------------------------
Date: Mon, 22 Dec 1997 10:04:09 -0800 (PST)
From: [EMAIL PROTECTED]
Subject: Re: NEC4
To: [EMAIL PROTECTED]
Chris Hanson,
Information on ordering NEC-4 follows.
Jerry Burke
LLNL
****************************** NEC Information ************************
Thank you for your inquiry about the Numerical Electromagnetics Code (NEC) -
Method of Moments developed at LLNL under funding by the Department of
Defense (DoD). The purpose of this letter is to explain more about NEC
and how you may obtain a copy of the NEC Software and Documentation. NEC's
accuracy and availability have caused it to become a standard in antenna
analysis. As such, it is vitally important that user feedback be incor-
porated into the latest versions. NEC remains in continuing development
and is meant to be used as a research and analysis tool. NEC's exemption
from Department of Energy Directive 1360.4, allows us, as software
developers, to distribute NEC to DoE and DoD organizations and contractors,
and to individuals and groups willing to work in collaboration with us
during software development.
The versions of NEC currently in use are NEC--2 and NEC--4. NEC--2 will
model wire structures in free space or over a ground plane and can also
model closed, perfectly conducting surfaces. NEC--4 includes the cap-
abilities of NEC--2 and also can model wires that are buried or penetrate
into the ground. NEC--4 also includes a revised modeling algorithm that
is stable for electrically small models and has a more accurate treatment
for wire junctions and stepped-radius wires as well as a number of other
new features. NEC--4 is subject to export restrictions, and hence
distribution is limited to U.S. citizens under conditions described below.
Also included with the NEC distribution are the graphics programs NECPLOT
which reads an input or output file and plots a view of the structure,
ZPLOT which plots antenna input impedance versus frequency on Cartesian
or Smith charts, and PATPLT which makes polar plots of radiation patterns.
These programs use the DIGLIB graphics library which is included with the
NEC distribution package for DEC Alpha, UNIX, Windows 95/NT or Macintosh
computers. Programs are also available from comercial sources that act
as wrappers on NEC-2 or 4 to provide integrated pre- and post-processing.
The distribution package for NEC includes:
> Fortran source files for the single- and double-precision
versions of NEC--2 or 4
> Fortran source files for NECPLOT, ZPLOT and PATPLT
> Compiled executable files of the above programs are included
for DEC Alpha, Windows 95/NT or Macintosh distributions. The
UNIX package includes only source code for NEC, DIGLIB and
plotting programs.
> Sample input and output files for examples shown in the manual
> DIGLIB - Device Independent Graphics LIBrary for DEC Alpha,
UNIX or Macintosh systems
> NEC documentation (printed):
> NEC--2 Documentation - UCID--18834: Part I, Program Description
-- Theory; Part II, Program Description -- Code and Part III, User's
Guide
or
> NEC--4 Documentation - UCRL-MA-109338: Part I, User's Manual and
Part II, Program Description -- Theory
> Documentation for NECPLOT, ZPLOT and PATPLT
> DIGLIB manual (electronic file)
At LLNL we have versions of NEC--2 and 4 for DEC Alpha, UNIX (Sun or IBM
RC/6000) and Apple Macintosh systems. The UNIX package is normally sent
out as a compressed tar archive on an 3.5 inch diskette. The DEC Alpha
distribution is a VMS BACKUP save-set normally written on 9-track tape.
The Macintosh code is written on 3.5 inch diskettes as a self-extracting
archive. We will try to accommodate requests for other formats when
possible. The Macintosh version of NEC--2 on floppy disks is available
alone for $250, or if requested will be included with the package for
larger computers.
We do not have access to a DOS computer, but can send the UNIX source files
on 3.5 inch diskettes in DOS format. The NEC--4 source files should compile
with minor changes (such as the CPU time function) with DOS Fortran
compilers. NEC--2 is older code, and may present more problems in
conversion to DOS. A version of NEC--2 for DOS (NEC--81) is included
in the NEEDS-2.0 package available from the Applied Computational
Electromagnetics Society.
If you are interested in joining the group of NEC Users/Collaborators,
the NEC Code Distribution Policy must be followed to initiate a request
for NEC software from LLNL.
The requester must:
> Agree to collaborate with us.
> Confirm compliance to our policy with your signature
on the completed NEC Order Form/ Questionnaire.
> Place a formal order for NEC on a completed Order Form/Questionnaire
submitted with payment-in-full, in the form of a check made out to
"The Regents of the University of California", or a purchase order
for the $850 fee ($150 for educational use) charged for distribution
and processing.
> Agree to use NEC as a research and analysis
tool only, NEC may not be sold or re-distributed in any way.
> provide us with information about your planned
application for NEC.
> Inform LLNL in writing of errors or deficiencies
encountered in the use of NEC.
> Share any modifications or additions made to NEC.
Since NEC--4 is subject to export restrictions additional requirements apply.
Persons requesting NEC--4 must acknowledge that NEC--4 is subject to export
restrictions under the Arms Export Control Act (22 USC 2751 et seq), cannot
be distributed outside of their organization and must not be taken out of
the United States. Requestors of NEC--4 must be U.S. citizens and must
ensure that only U.S. citizens will have access to the code. In some cases
NEC--4 can be sent to requestors who meet the requirements of a "U.S.
Person" as defined in the International Traffic in Arms Regulations.
The NEC Development Team is not responsible for user instruction on NEC codes
or software installation. We guarantee the results of the sample problems
only. If these arrangements are to your satisfaction, we will be happy to
send the latest appropriate version of NEC to you.
To order NEC--2, or NEC--4 for a U.S. citizen, the questionnaire can be
returned to:
G. J. Burke, L-154
Lawrence Livermore National Lab.
P.O. Box 808
Livermore, CA 94550
(FAX: 510-423-3144)
Persons outside the United States who wish to receive consideration
for NEC--4 must submit their request through embassy channels to:
Headquarters, Department of the Army
Office of the Deputy Chief of Staff for Intelligence
ATTN: DAMI-POC, Room 2D485
1000 Army Pentagon
Washington, D.C. 20310-1054
For staffing to: Commander
U.S. Army Information Systems Command
ATTN: ASIS (Ms. Daniel)
Ft. Huachuca, AZ 85613-5300
Thank you for your interest in NEC. We are looking forward to developing
a mutually rewarding user/developer relationship with you.
Sincerely,
G. J. BURKE
Engineering Research Division
Fax: 510-423-3144
NEC Order Form/Questionnaire
NEC User................................................................
Organization............................................................
Address.................................................................
City.................................... State......... ZIP.............
Phone............................... FAX................................
Please place an order for the following NEC code: [ ] NEC-2
[ ] NEC-4
Payment in full or a purchase order for $850 Distribution and Processing
Fee (or $250 for the Apple Macintosh version of NEC-2) must accompany this
order. Checks may be made payable to "The Regents of the University of
California." Payment is not required for shipment to DoD bases.
Universities can obtain NEC-2 or NEC-4 for a reduced fee of $150 for
educational use.
NEC is being released as a code in development. Positive responses to
the following questions are required to meet our distribution policy:
Yes No
Do you agree to collaborate with us as a NEC User? [ ] [ ]
Are you willing to inform us (by mail) of errors or [ ] [ ]
deficiencies and share the modifications or additions
that you or your organization make to NEC?
Where/how did you hear about NEC?.......................................
........................................................................
How do you plan to use NEC?.............................................
........................................................................
Please describe the computer system on which you plan to use NEC. Unless
otherwise requested, the code for UNIX systems will be sent as a
compressed tar archive on 3.5 inch diskettes.
........................................................................
........................................................................
........................................................................
Signature of the Requestor.............................. Date...........
Additional information required for NEC--4 requests only:
NEC--4 is subject to export restrictions under the Arms Export Control Act
(22USC 2751 et seq). To receive NEC--4 you must be a U.S. Citizen and
agree that the code will be used within the United States and not be
released outside of your organization.
Yes No
Are you a U.S. Citizen? [ ] [ ]
Your signature below will attest that you understand and agree that NEC--4
is subject to export restrictions, that NEC--4 will not be distributed
outside of your organization and that only U.S. citizens will have access
to this code.
Signature of the Requestor................................. Date.........
========================================
Complete this section only if this information is not the same as the NEC
User Address.
Shipping Address:
Name....................................................................
Organization............................................................
Address.................................................................
City...................................... State........ ZIP............
phone...................................................................
Billing Address:
Name....................................................................
Organization............................................................
Address.................................................................
City...................................... State........ ZIP............
phone...................................................................
