My anti-virus software says EZNEC is infected with a virus. Is it?
No. The number of false positive virus reports has been steadily increasing for various files in all versions of EZNEC, including ones which have been in use and unchanged for many years. Web research shows that this is also affecting many other programs. (Search, for example, "false positive virus", without the quotation marks, with Google.) The cause is that anti-virus programs now include "heuristic" detection methods which use proprietary routines that attempt to detect unknown viruses rather than identifying known malevolent code. There also seems to be an effort in this competitive market to have a product "find" more "viruses" than competing products. The result is a large and increasing number of false positive virus warnings.
When false positives began appearing, I was able to contact the offending anti-virus companies to have them correct their routines to remove the false indications. Some were very responsive, some were not. Such a large number of products and files are now involved, however, that it's no longer possible to take this approach. One major program manufacturer didn't bother to respond at all when I contacted them recently, so apparently the complaints are too numerous for them to handle.
Extensive efforts are made to keep the machine used for EZNEC creation clean and files free from any possibility of infection. If you feel uneasy about continuing to use EZNEC following an anti-virus alert, I recommend that you submit the file in question to the anti-virus program company for analysis; some of them, at least, have a mechanism to do this. I would like to know immediately if any EZNEC file is ever confirmed to have a virus infection, and I will give it immediate action. However, this has never happened in spite of the rapidly increasing rate of reports. I would encourage those who see false positive indications to consider whether to believe other reports, both positive and negative, their anti-virus program is producing, and perhaps try some other company's offering.
How to install EZNEC - Anti-virus programs more commonly interfere with EZNEC installation than with the program itself, so successfully disabling anti-virus software during installation usually is all that's needed in order to use EZNEC. Unfortunately, some anti-virus programs not only flag non-existent threats, but also don't actually stop working even when you tell them to and when they say they have. If you're unlucky enough to have one of those, then the only way to insure that it's stopped is to start your system in Safe Mode, then install EZNEC while running in Safe Mode. The steps required to start in Safe Mode changed with Windows 10, so please consult the Internet for instructions for your system.
I am sometimes asked for an anti-virus program recommendation. I've used ESet NOD32 for several years and have found it to be easy to use, unobtrusive, trouble-free, and relatively free of false positive alarms. At the other end of the spectrum, McAfee has consistently been one of the worst at generating false positive indications, deleting files without notice, and continuing to run even when supposedly disabled. I purchased a copy some time ago to test EZNEC and was surprised sometime later to find that by agreeing to the normal legalese license agreement, I had unwittingly also agreed to let them automatically charge my credit card each year for a subscription renewal. So that is a brand I particularly do not recommend.
I have no control over the anti-virus programs, so can do nothing to prevent poorly designed ones from falsely identifying EZNEC files as being infected. All I can do for people who might choose to believe the anti-virus programs is to offer a full and immediate refund for the EZNEC purchase price, which I'm absolutely willing to do.
How do I install EZNEC
on another machine, or reinstall it?
If you purchased a CD, you simply run its file setup.exe on the new machine. If you didn't, you need the file you downloaded when you purchased EZNEC. This file is eznec60.exe (standard program) or eznec60+.exe (EZNEC+). Copy it to the machine on which you want to install EZNEC, and run it. If you don't have any way to back up this file, you should purchase the CD.
What operating systems will EZNEC
v. 6.0 run under?
Windows XP(SP3)* and later Windows operating systems, 32 or 64 bit.
* Intel CPU is required on XP and Vista systems but not on Windows 7 and later.
v. 6.0 use NEC-4 for calculations?
Of the five EZNEC v. 6.0 program types (demo, standard EZNEC, EZNEC+, EZNEC Pro/2, and EZNEC Pro/4) only EZNEC Pro/4 uses NEC-4. NEC-2 is the calculating engine used by the other EZNEC programs. See the next item, below, for more information.
What are the differences between the
standard, plus and professional programs?
EZNEC+ has all the features of the standard program, plus:
There are two professional (EZNEC Pro) programs, EZNEC Pro/2 and EZNEC Pro/4. They are identical except that EZNEC Pro/4 can use NEC-4.2 for calculations as well as the NEC-2 used by the other EZNEC program types.
addition to the features of
the professional programs
The primary advantages of NEC-4 are that buried conductors can be modeled, and NEC-4 is relatively free of the small error produced by NEC-2 when analyzing connected wires of different diameters.
is $675. Purchasers of EZNEC
must first obtain an
license. For information please
consult the LLNL NEC-4 web site
information. For more
information about EZNEC
see the EZNEC
Pro web page.
v. 6.0 use the antenna description files I created with an earlier
Absolutely! EZNEC v. 6.0 can even read and translate DOS EZNEC (.EZ) and ELNEC (.EN) files -- just include the extension (.EN) when specifying the name of an ELNEC file to open. Older versions of EZNEC can also read and use files written by EZNEC v. 6.0, although new objects not existing in the older versions will be ignored. EZNEC v. 6.0 uses the same plot file format as EZNEC v. 2.0 through 4.0, and can display plots saved by ELNEC or any version of EZNEC.
If I buy the CD
version, does the CD have to be in place when running the program?
No. All necessary files are installed on your hard drive. The CD is needed only for installation. If desired, the CD files can be copied to a hard drive or other storage medium and the program installed or re-installed from there.
Where's the manual?
The manual is an integral part of the program. With EZNEC v. 6.0 running, In the EZNEC v. 6.0 Control Center (the main window), click Help on the menu bar, then choose Contents to view the manual. You can also open the manual to the relevant topic from many places in the program by pressing F1.
Is it possible to get a printed manual?
Yes, if you're willing to print it yourself. If you purchased EZNEC on a CD, you'll find it in the Printable Manual directory on the CD. Otherwise, you can download it. Clicking here will take you to the page where you can get more information. No pre-printed manual is available.
What are the EZNEC and EZNEC+ v. 6.0 segment limits?
The limit for EZNEC v. 6.0 is the same as for earlier versions, 500 segments maximum. This allows approximately 25 wavelengths of wire, or 50 beam elements. EZNEC+ v. 6.0 now allows 2000 segments, and the professional EZNEC v. 6.0 programs accommodate up to 45,000 segments.
Will EZNEC v. 6.0 overwrite previous versions?
EZNEC v. 6.0 will overwrite and update EZNEC v. 3.0 - 5.0 if installed in the same directory.
Will installing or uninstalling EZNEC erase or overwrite my existing description or trace files?
What's the difference between the upgrade version and full program?
There are no different "upgrade" and "full" or "new" versions, only upgrade prices. There's only one version, and it's a complete, independent program which doesn't require any other program or older version in order to install or function. The only difference between a new purchase and an upgrade purchase is the price; the program is the same.
Is there any difference between the download and CD products?
No. The CD contains the same single executable file you get if you download. The CD also contains the printable manual, but that's available at the web site. You may need to re-install EZNEC in the event of a hard drive failure or change to your computer system, so you should always keep either the CD or a copy of the downloaded file. If you don't have any way to back up the downloaded file on some medium other than your primary hard drive, you should order the CD (with or without the download) to protect against loss of the program in the event of a hard drive failure.
My EZNEC v. 6.0 runs extremely slowly. Why?
versions of McAfee and other antivirus sofware,
in the background detection mode, can cause extremely slow operation of
problem can suddenly appear
antivirus software is updated. Apparently, the antivirus software
intercepts and analyzes the communications between the calculating
engine and the main program. These communications are numerous and
frequent, so the rather slow analysis process by the antivirus program
greatly slows EZNEC
operation. The only certain solution is to disable
the background checking feature of the antivirus software while running EZNEC.
So far, this
has been reported only with McAfee version 4, and it appears that
version 6 and later versions might not have this effect on EZNEC.
however. Other virus-detecting software could possibly have a similar
effect, so if you encounter exceptionally slow operation, try disabling
any anti-virus software you have running, and let me know
solves the problem.
What language is EZNEC v. 6.0 written in?
program was written in
Microsoft Visual Basic 6.0. It consists of more than 70,000 lines of
code, not counting comments. There are additionally a number of speed-critical
routines written in Fortran and placed in dlls. I wrote every line, and it took about two
years of essentially full time work to develop the first Windows
calculating engine is a modified version of the public domain NEC-2
program. It's written in Fortran and incorporated as a separate
Where can I get more EZNEC models?
CD included with the 20th and later
editions of the
models of a wide variety of antennas. While specially created to work
with the EZNEC
program which is now incorporated in the EZNEC v. 6.0 demo,
they're also standard EZNEC
which work normally with EZNEC,
EZNEC+, and EZNEC
without the EZNEC
files, the ARRL
is a bargain, but the files make it even more so.