[Antennaware] Modeling antenna interaction

[Guy Olinger, K2AV]

I've gotten to the point where I model ALL conductors in the vicinity, 
including coax shields, towers and metallic guys, with appropriate 
lumped loads where baluns are used, etc.  This would include a boom 
with elements connected to the boom if that's how it's constructed. If 
it's not connected, move the element up an inch or two to clear the 
boom.

I drop a conductor out of the model if it's RF bonded to boom, mast, 
tower  BOTH at top and bottom. Everything else I layout to its end, 
including coax and cables on the ground to the shack.

If you have egg style insulators breaking up a metallic guy,  put a 
10pf load at the insulator point in the guy to represent the 
insulator.

If this is not a Force 12 style tribander (no traps, no linear 
loading) modeling the antenna is pretty easy. Traps and linear loading 
in a tribander can be a real pain because of the lack of verified 
modeling constants.

It's all a nuisance,  but if you discover anything it's worth it.

73, Guy

----- Original Message ----- 
From: "Carsten Steinhöfel" <carsten.steinhoefel at web.de>
To: <antennaware at contesting.com>
Sent: Saturday, February 24, 2007 10:04 AM
Subject: [Antennaware] Modeling antenna interaction


> Hello,
>
> I want to model interaction between a Tribander and a 40m-Antenna on 
> the same mast.
> I can model both antennas and make sure that the wire elements align 
> of course. Is
> this alone a sufficient test, or do I have to model the seperated 
> nature of the
> feedpoint of the antennas - or the coax as a transmission line 
> (grounded or open)?
>
> Thanks in advance for any tips.
>
> vy 73 Carsten, DL1EFD
>
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