NEC4WIN95 is a 32 bits
antenna simulation software based on MININEC3
developed by the Naval
Ocean Systems Center in the 70s and 80s. It runs under Windows 95, 98,
NT and 2000. It can be used to simulate, analyze and optimize wire antennas, beams,
verticals, etc...
NEC4WIN95 has limitations. They are the same as Mininec3
on which the engine is based. Close parallel wires, horizontal wires too close to the ground, sharp
corners may be a problem to simulate. Log Periodics and Transmission
Lines can't be simulated accurately with it. Antenna impedance is always calculated based on
Perfect Ground.
The number of wires supported by
NEC4WIN95 is limited to 50 and segment to 250 and for complex
projects you should look at NEC4WIN95VM.
NEC4WIN95 can simulate Quads
and loops with increased accuracy with the new Loop
Correction feature. This is done without increasing segments
or adding tapering. As shown by our tests, and you can try too,
results are very close to NEC2 results.
Requirements
Windows 95/98, NT or 2000. Running NEC4WIN95 on a fast 486 is
possible but a Pentium with a good amount of memory (32Mb and up) is highly recommended.
NEC4WIN95
features
NEC4WIN95 is a true Windows 32 bits program. It is
mouse driven and according very user friendly. It supports all monitors and printers
supported by Windows, and allows cut and paste of all graphics from NEC4WIN95 to other
Windows applications supporting graphics (Paint programs, Word, etc...)
Wires are defined in a spreadsheet
Geometry form, by defining the X, Y and Z coordinates of wire extremities. Sources and
Loads are inserted on wires using drag and drop operations. No need for calculating pulses
position anymore. Ground characteristics are selected using the mouse to model real ground
or ideal perfect ground. Radials can be added to the basic ground selection (ground
will influence only Far Field patterns and gains)
You can plot the radiation patterns for a given height, then
click with the mouse to change the height and get the new radiation pattern without
editing your project. The Far Field patterns windows display all the information
needed without having to run secondary commands difficult to remember. On the left side
you have impedance and SWR, Height, Ground parameters, Radial length and number, Gain,
Front to Back (in Azimuth mode), major lobes angle and width, etc....
A 3D view of the antenna will show you not only the antenna,
sources and loads, but also the currents and the 3D pattern. You can click on buttons to
see pulses and pulse numbers if you want. You can also move, rotate or zoom/unzoom
antenna, currents and patterns using only the mouse, all of this in real time. Pictures
can be copied using Windows compatible commands and pasted into Word Processors, Graphic
programs to edit and convert them to other formats.
Far Field Patterns
All info about the antenna and radiation pattern is displayed
with the radiation pattern. You want to see changes introduced by an increase or decrease
in height? Click on the height control then on the Zen button for Zenith or AZ for
Azimuth and the new pattern is displayed. Impedance, Gain, Front to Back (in Azimuth) and lobes angles and width at -3dB are displayed on the
left side.
Graphical placement of Sources and Loads
Finding the pulse position for sources or loads is usually a
big problem. In NEC4WIN95, when you double click in the source/load column of the geometry
grid, a graphical representation of the wire is displayed (picture below). Drag a Source
or Load and drop it on the wire at the location you want. Click on the new Source or Load
to define its parameters and that's it. The pictures below are for an 80/40m Trap dipole.
