[600MRG] Trap verticals

[D.J.J. Ring, Jr.]

Rudy,

I tried to figure out how to use the computer program to model and I got
lost, is there a good tutorial or book or course to take?

Dummies like me  need extra tutoring:  Once I learn I am a salesman for the
unconverted, but being unwashed in the fine art of modelling antennas, it
is a mystery to me.

73

DR
N1EA

On Mon, Sep 7, 2015 at 2:12 PM, Rudy Severns <n6lf at epud.net> wrote:

> Hi Ken,
>
>
>
> First off I plead ignorance, I've never looked into or used trap antennas.
> I've been fortunate to have the space to put up mono-banders.  I understand
> the general principles behind trap antennas but that's not the same thing
> as
> "knowing" how to design one.  If I wanted to solve your problem I wouldn't
> spend much time calculating.  There have been some articles on calculating
> traps over the years because there was no alternative except calculation
> combined with experimental cut-and-try.  But now we have excellent modeling
> programs.
>
>
>
> I assume you have an antenna modeling program?  If not, Google 4NEC2 and
> download it for free.  It's a great program which will do 95% of what you
> need for LF-MF antennas and it'll run any cheap machine, I use a $100
> machine from Goodwill recycle!  I have much fancier software but that's
> only
> for the last fine details involving buried wires and such.   I suggest you
> start by modeling the antenna you're currently using/taking down.  That
> gives you a known quantity from which you can explore other options.
>
>
>
> It is true, if you have not been modeling there is a learning curve which
> will require you to invest time in learning how to make the software play.
> That can be a frustrating time but I guarantee you if you struggle through
> the early fog and get going with the modeling you will never go back.  You
> will only wonder why you waited so long!  Modeling is THE key tool for
> LF-MF
> antennas which must be designed anew to fit each QTH.  While you can do
> some
> preliminary calculations to estimate Rr and such, experimental cut-and-try
> is a waste of time.  Do the cut-and-try in the modeling, vastly easier!
>
>
>
> I hope this helps Ken.
>
>
>
> 73, Rudy N6LF
>
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