Antenna modeling using nec2c on Ubuntu Linux

New Thing! Video!

I’ve been playing with antenna modeling, and decided to make a video series introducing this to other people who may be interested.

I’m new to this, but I think it came out pretty well. I only misspoke a couple of times, but it will probably only be noticed by the technical pedants (I count myself among these).

The first episode covers the basic user interface and some basic concepts. I already have plans to make more episodes, possibly with these topics:

  • Basic data input file format for xnec2c
  • Antenna tuning, resonance
  • Single band beam antennas, more elements for more directivity
  • The dB (Decibel) – as a unit AND a referenced quantity
  • SWR – what it is, why it matters, and when it doesn’t
  • How antenna height affects gain and impedance
  • How to model traps in xnec2c
  • Near field analysis – why do you need it and what does it mean?

I need to figure out where to place show notes for these, as there are a lot of good information sources about these topics on the internet already, and I need to reference those in each episode. I’ll get smoother at all that.

For the first episode, here’s how you can fetch the example files:

git clone

Here’s a link to my show page on

And here’s the embedded episode:

About Steve

I'm Steve Conklin, AI4QR I'm employed by Salesforce, on the SRE team for Heroku. Interests include Linux, open source software and hardware, electronics and music, and amateur radio.
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4 Responses to Antenna modeling using nec2c on Ubuntu Linux

  1. Greg says:

    Nov 20, 2012,

    I enjoyed your video.
    However, the “git clone” comand failed:
    git clone
    Cloning into ‘Antenna-Modeling’…
    The authenticity of host ‘ (’ can’t be established.
    RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
    Are you sure you want to continue connecting (yes/no)? yes
    Warning: Permanently added ‘,’ (RSA) to the list of known hosts.
    Permission denied (publickey).
    fatal: The remote end hung up unexpectedly

    Trying again, produces fewer but the same final message
    git clone
    Cloning into ‘Antenna-Modeling’…
    Permission denied (publickey).
    fatal: The remote end hung up unexpectedly

  2. kirby says:

    Not sure whether my post made it, so I will resubmit……

    Part one on the xnec2c video ends after about 12 seconds. Is a full version available anywhere?


    • Steve says:

      This is pretty much the last straw for me with blip.

      I’ve mirrored the originals in ogg format on my web site:

      Use the [LOCAL] links

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