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NEC4WIN 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...

NEC4WIN 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 NEC4WIN is limited to 50 and segment to 250 and for complex projects you should look at NEC4WINVM.

NEC4WIN 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.


Windows 95/98, NT or 2000. Running NEC4WIN on a fast 486 is possible but a Pentium with a good amount of memory (32Mb and up) is highly recommended.

NEC4WIN features

NEC4WIN 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 NEC4WIN 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 NEC4WIN, 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.

True RLC Serial or Parallel loads
Loads can be entered as Serial or Parallel. Resistance - Reactance combination or true R, L, C components. When you enter R, L, C components the R and X boxes on the line above will display the resulting impedance and you can even fine tune your traps by adjusting L and C for the higher X possible. The picture below shows you one of the loads of the trap dipole for 80/40m near 7.2 MHz. Note that the Reactance box displays the trap reactance and that the LC combination is near resonance. You can adjust the values of L and/or C to design traps for a specific frequency.

3D View and Patterns

The 3D View displays a 3D view of the antenna. Currents and radiation pattern can be displayed on top of the antenna and freely rotated in 3D using the mouse. Patterns are calculated once and can be turned off/on by clicking on the 3D Pattern button. Some examples of 3D views below.


Click and Go optimizer. No symbolic variables, no equations. Most of the operations below can be done using the mouse only.

  • Optimize for Resonance, best SWR, Gain, F/B, or Gain-F/B combinations
  • Optimize elements width, spacing or height separately.
  • Optimize Loads (Resonance only in current release)
  • Trigger values to stop optimization.
  • Possibility to Lock wires to prevent the optimizer from changing them. All wires connected to a locked wire will have the connection coordinate also locked.

 View of the optimizer dialog

In case of problem consult

Or Email tech support:  support@orionmicro.com

Copyright 2004 ORION Microsystems.