Antenna Modeling With 4NEC2. Presented to HOTARC. By Craig Weixelbaum. May 22, Basic Modeling Approach using 4Nec2. The goals of this A Beginner’s Tutorial for 4NEC, a NEC2 Distribution. Written and Tested by Scroll down, and find “Latest 4nec2 version ()” under the “Downloads” header. Hello! Does anyone know where I can find some good tutorial/guide to get a basics of how to use 4nec2. I am total beginner. I was able to find.

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I’m interested in 4nec2 and have it downloaded into the computer. Does anyone have a favorite tutorial for the futorial I’ve run into several on U Tube and for whatever reason, they just don’t get the information across to my lil’ ole pea brain. So, I’m curious what you liked or didn’t like.

It’s not like I’m exceptionally stupid, just strapped for time and I would like to model my vertical without putting someone else out to do it. Thanks ahead of time for your input. I’m sure there is a lurker out there thinking the same thing.

WZ7UMar 8, The lurker i am. Also very stiff with that soft.

UA3TWMar 8, I am pretty familiar with 4NEC2. I can’t really comment on the best tutorial since there were none when I started using it. I know there are some tutorials now, but I could not really say which tutoial best.

I know there is a pdf by Gunthard Kraus that has the basics. But I can offer a few pointers. In my opinion once you know how to launch the program, the next logical step is to run an example antenna and play around with it until you understand some of the controls of the program and how to interpret the output. This means you don’t have to enter the parameters for a specific antenna until you know more of how the program works.

I know a lot of tutorials start with how to edit antenna files. You will need to know this eventually, but in my opinion, doing this at the beginning before you know what you are trying to analyze makes it more confusing.

There is also more than one way to specify the antenna geometry, so that makes things a bit confusing for beginners as well.

I’d recommend to run an example like a simple dipole on a single frequency and observe the impedance, pattern, VSWR etc. If you are beyond this stage and have specific questions about entering antenna simulation input or interpreting results, you can ask them here and someone will likely be able to point you in the right direction.


If you have a question about something specific in a youtube video post the link and the time in the video that is unclear and ask your question about what was presented. Someone may be able to clarify. Start simple and make incremental steps. All of these EM simulation software is pretty complicated. The programmers can abstract some of the complexity so it seems more intuitive, but I find the 4NEC2 to be a pretty solid tool. Once you know how to analyze and interpret an existing example antenna.

Try a few more examples and see if you have mastery of this simple analysis. Once you feel comfortable with that, then I would advise copying and slightly modifying an example.

It would be good to read how to enter antenna data, but rather than enter a whole antenna file, just modify something you think you understand and see 4nsc2 it does what you think it will. 4necc2 incrementally build on your knowledge base of antenna data entry.

Change the frequency of simulation. Change the length of part of the antenna and observe it in the geometry window and also how it changes the simulation result. Change where the source is placed. Look at the antenna text file and see if you understand some of the syntax and meaning of the lines in the file. Can you change a line and have it make logical sense? If you have questions, just ask, probably someone knows the answer and tjtorial be glad to help. For example i got fully lost in the organisation of this soft.

There are “in” files “out” files and so on. 4nev2 lose files sometimes in 4nec2, cannot see the logic of that organisation.

A Simple Pull-up Mono-Band Verticle Dipole Antenna Design – and 4NEC2 Tutorial – Squash Practice

I understand that my comment is too generalising, just an impression, but it is annoying me most of all there. Just now as i open 4nec2, it shows me: Well, I delete this message and open “file” box. I can see the list of files of various kinds, like this: Why so many and what to do with them? It giveth me an inferiority complex. Here is a simple explanation of the types of files.


An input file is usually a text file like a. You can store these files wherever you want in whatever directory structure you like. An output file contains the results of a simulation of the input file. You can store these wherever you want as well. You can always re-simulate an input file to obtain an 4nrc2 file. The optimizer or sweeper can be used to change the value of defined variables and generate a collection of output files.

I think that many technically oriented folks can learn to navigate it. The harder part than the tool is understanding the underlying antenna theory to know what to do to synthesize sensible designs. I think the reason you are seeing the NEC error is that by default 4NEC2 opens the last antenna you were trying to simulate.

If that design has an error that is caught by the rule checking it will give you the same tuyorial until you fix it. Maybe it is something like Tuotrial This is an 80 meter simple wire antenna.

In the main window choose Calculate and then NEC output data. A new window will appear. In it select “Use original file” then select Generate.

Antenna Simulation Tutorials using 4nec2

A command box will open temporarily to show progress of the simulation. After the simulation completes you will see that there are parameters in the main window which represent the simulation. Things like the impedance, SWR efficiency etc. If you want to see the pattern then you would re-run the simulation. In the new window select instead “Far field pattern” then tutoral Generate. In this case when the simulation completes a new window will open that shows the antenna pattern. You can choose which pattern to observe.

Antenna Simulation Tutorials using 4nec2 – KW4FB

Hopefully this information is useful. It is, thank you very much! WZ7UMar 9, You must log in or sign up to reply here. Your name or email address: Register for a free QRZ account.