Re: [TowerTalk] Antenna modeling

[Joe - WDØM <WD0M@centurytel.net>]

2 Cents worth:

A SteppIR can be "adjusted" for top loading - as you move the elements, you 
can see how it interacts on your system, and move the elements to the 
position that may optimize your installation.  Once you've determined it, 
you can save that antenna configuration, and push a button to move the 
elements to that position.  With fixed beams, you get what you got.  It may 
not make a bunch of difference, either way, however.....just a thought.  I 
love the 4 element SteppIR, so my comments are a tad biased.  I'll leave 
the modelling questions to the experts.  ;-)

73,

Joe
WDØM


At 08:44 AM 12/8/2004, R. Kevin Stover wrote:

> Hello all.
>
> I'm planning a tower install this next spring and am getting deep into the 
> planning and a have a few questions.
>
> #1. How do you model commercial antennas without the dimensions of said 
> antenna?
>      I'd like to be able to model the antenna before buying it
>
> #2. How do you model something like a Cushcraft X7 with the log feed section?
>
> #3. When modeling an antenna with traps how do you know what values to 
> plug in as loads for the traps?
>
> I was planning on 4el SteppIR and an XM240 on a 70ft AN Wireless tower 
> then I got to thinking about feeding the tower for 160m and using the 
> beams for toploading. That won't work too well if the dimmensions and thus 
> toploading provided by the SteppIR change all of the time so I'm now 
> looking for traditional beam designs. Since Cushcraft is the only 
> manufacturer to my knowlege that provides manuals for the products online, 
> and I can use those dimensions to get an idea of how the system will 
> perform, they've moved to the head of the pack.
>
> Thanks for your input and advice.
>      .
>
> --
> R. Kevin Stover, ACØH


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