1. Introduction
2. Features
   • Interactive Operation
   • No Output File
   • Windows
   • Color Coding
   • On-demand Calculation
   • Multi-threaded operation on SMP machines
   • Built-in NEC2 input file editor
3. Limitations
4. Compilation and Installation
5. Operation
   • Command Line Options
   • The Main Window
   • The Radiation Pattern Window
   • Frequency Data Plots
   • NEC2 Input File Editor
6. Input File Considerations
7. Output File Considerations
8. Version History
9. Bugs and Inadequacies
10. Acknowledgement

Xnec2c is a GTK2-based Graphical version of nec2c, my translation to the C language of NEC2, the FORTRAN Numerical Electromagnetics Code commonly used for antenna simulation and analysis. The original nec2c is a non-interactive command-line application that reads standard NEC2 input files and produces an output file with data requested by "commands" in the input file. In contrast xnec2c is a GUI interactive application that (in its current form) reads NEC2 input files but presents output data in graphical form, e.g. as wire frame drawings of the radiation pattern or near E/H field, graphs of maximum gain, input impedance, vswr etc against frequency and simple rendering of the antenna structure, including color code representation of currents or charge densities. These results are only calculated and drawn on user demand via menu items or buttons, e.g. xnec2c is interactive and does not execute NEC2 "commands" in batch style as the original does. Printing of results to an output file has been removed starting from version 1.0, since xnec2c works in a way that does not allow printing compatible with the NEC2 format. If printing to file is needed then it is better to use the original NEC2 program, to avoid bugs that may still be lurking in the C translation.

Xnec2c now has a built-in editor for NEC2 input files which can be used to edit geometry or command "card" data. This basic editor displays comment, geometry and command cards in tree views where individual rows, each representing a card, can have their cells edited directly for "raw" entry of data. More useful are pop-up "editor" windows that open when appropriate buttons are clicked or when a selected row is right-clicked with the mouse. These editors allow easier, more convenient entry and editing of individual rows, with no need for detailed knowledge of "card" formats. When editing is completed, the contents of the nec2 editor can be saved in a NEC2-compatible input file which can then be re-loaded by xnec2c for execution.

• Interactive Operation:
  Xnec2c is interactive in its operation, e.g. when started it just shows its Main window in a "blank" state, indicating that no valid input data has been read in yet. The NEC2-type input file can be specified at start-up in the command line with the -i option or it can be opened from the file selection dialog that appears via the File->Open menu of the Main window. Once a valid input file is opened, all the normal widgets in the Main window appear so as to allow proper operation. The NEC2 "commands" in the input file are read in but not executed, until a request is issued by the user via buttons or menus in the appropriate windows.

• No Output File:
  Printing of results to an output file has been removed starting from version 1.0, since xnec2c works in a way that does not allow printing compatible with the NEC2 format. If printing to file is needed then it is better to use the original NEC2 program, to avoid bugs that may still be lurking in the C translation.

• Windows:
  In its current form, xnec2c has three windows for the graphical display of output data: When started without an input file specified by the -i <input-file> option, the Main window opens with most of the button and menu widgets hidden. When a valid input file is opened, all the hidden widgets are shown and the structure is drawn in the Main window's drawing area widget. From the View menu, the Radiation Pattern and Frequency Related data display windows can be opened, to draw either the Gain pattern or the Near E/H fields or Frequency-related Data like Input Impedance, VSWR, Max gain, F/B Ratio, Gain in the Viewer's direction etc. Both the Main window and the Radiation Pattern window have buttons to select fixed viewing angles of the structure or the radiation pattern, as well as spin buttons to input specific viewing angles.

• Color Coding:
  Xnec2c uses color coding to visualize the Current or Charge distribution in the Structure's segments or patches as well as the Gain pattern or the Near E/H field pattern. Color coding is also used to clarify the Graphs of Frequency-related data. A color code strip is shown in the Main and Radiation Pattern windows.

• On-demand Calculation:
  Since xnec2c collects data to be displayed in buffers directly from the functions that produce them, there is no need to produce and parse an output file and no need to re-run the program when certain input data (currently the frequency) is changed or when different output data (gain, near-fields, input impedance etc) is required. The frequency can be changed either from spin buttons in the Main and Radiation Pattern windows or by clicking on the Frequency Data window's graph drawing area. The frequency corresponding to the pointer position will then be used to re-calculate whatever data is on display.

• Multi-threading operation on SMP machines:
  Since version 1.0, xnec2c can run multi-threaded (by forking) on SMP machines, when executing a frequency loop. Multi-threading is enabled by using the -j<n> option, where n is the number of processors in a SMP machine. xnec2c will spawn n child processes, to which it will delegate calculation of frequency-dependent data for each frequency step. Thus data related to n frequency steps will be calculated concurrently and passed on the the parent process by pipes, to be further processed for graphical display. Child processes are spawned before GTK is initialized and started so that only the parent process is tied to the GUI interface. Thus there are n+1 processes running when the -j option is used and execution is faster by slightly less than n times. Please note that its pointless and counter-productive to specify a value of n greater than the number of steps in the frequency loop.

  Built-in NEC2 input file editor:
  Xnec2c has a built-in editor for NEC2 input files. Data in NEC2 "cards" can be entered or edited either directly in the main editor window (tree view) or in more convenient dedicated editors for each type of card. Edited data can be saved to a NEC2 input file and reloaded for execution so that the edit-execute-display cycle is quicker and more convenient.

Since xnec2c is interactive, it cannot operate in the same way as NEC2 or nec2c. Specifically, commands that cause execution in NEC2/nec2c (XQ, RP etc), are only read in but not acted upon unless the user requests the display of relevant data. For example, if an RP command line is included in the input file, xnec2c reads the relevant data from that line but does not calculate/render the radiation pattern, until the user requests this by opening the Radiation Pattern window and clicking on the Gain button. In addition, the NX and WG/GF commands are not recognized since only one structure at a time can be input and evaluated, and the Numerical Green's function is not needed or implemented. Also, some options of certain commands (e.g. the surface wave option I1=1 of the RP command) are not implemented and they must not be used since they will disrupt or even crash xnec2c.

There are advantages deriving from the interactive operation: it is possible, for example, to specify both the NE and NH commands in combination with a multiple-frequency FR card, although only the relevant data of the last command will be used.

4. Compilation and Installation:
Please note that I use Arch Linux AMD64 which is a "bleeding edge" type distribution, so there may be compilation and/or run time difficulties if you are using a relatively old distro. This is mostly true of the basic dependencies like GTK+ 2 and Glade-2, and there can also be sound card incompatibility problems at run time.

To compile the package the first time, run the "autogen.sh" script in the package's top directory. The "configure" script as produced by Glade-2 specifies the gcc flags as "-g -O2", but if you want to specify different flags, you will have to run "configure" with the CFLAGS option, e.g. ./configure CFLAGS="-Wall -O2 -march=i686" or whatever flags of your choice.

Run "make" to produce the executable binary "xnec2c" in src/. This can then be copied to a suitable location, usually /usr/local/bin or /usr/bin. You can of course run "make install" which will install the binary into /usr/local/bin by default. You can change this to a different location, e.g. /usr/bin, by including the --prefix=/usr option when running "configure". To recompile the package, you must run "make distclean" in the top directory to clean up the package and then run the "configure" script and "make install".

No configuration files are needed and the sample input files that were used during development are in the xnec2c/examples directory. Please also read the xnec2c/doc/nec2c.txt file that describes the nec2c application that is used as the basis for xnec2c.

Command Line Options:
Xnec2c has the following command line options:

-i <input-file-name>: Specify a NEC2 input file to be opened at start-up.

-j <number of child processes to spawn>: Since version 1.0 xnec2c can run multi-threaded on SMP machines. This option specifies the number of child processes to spawn by forking, so that the total number of processes running will be n+1. n should be equal to the number of processors in a SMP machine. Please note that its pointless and counter-productive to specify a value of n greater than the number of steps in the frequency loop.

-h: Print usage information and exit.

-v: Print version information and exit.

The Main Window:
When starting xnec2c from a terminal or from a file manager (by OLE), the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's drawing area. The background color is black and the structure is rendered in blue. The excitation points (segments) are rendered in red, the x, y, z axis in white, loaded segments in yellow,al dis the -i option can be used to specify a NEC2 input file: xnec2c -i ~/nec2/turnstile.nec. Otherwise an input file can be opened from the Main window's File->Open menu item. If the input file is valid, xnec2c will render the structure specified in the Geometry section of the file in the Main window's dr