[TowerTalk] Re: Problems on a 2el vertical Array
Jan Erik Holm
sm2ekm at telia.com
Fri Jan 9 19:30:47 EST 2004
Mark Beckwith wrote:
,> Where you may not be realizing your model is: The model probably allocates
> power equally (50/50) between each vertical, right?
>
> In real life when you feed it, the SWRs on the two verticals are different
> because of the fact that there's a second energized vertical nearby having
> some kind of effect on it, and each is being fed in parallel with something
> else with a different length of coax, blah blah blah. Gets too complicated
> for me, anyway.
>
> This is the point at which my eyes usually glaze over. Better Men than I
> will go further: basically the induced SWR means the power doesn't get split
> 50/50 - it becomes 60/40 or 70/30 or whatever - not 50/50. Anyhow, if you
> plugged in some uneven amounts of energy at your sources in your computer
> model, you will see a degradation of the pattern - like you are experiencing
> in real life.
>
That´s why the Lewallen W7EL method should be used, as I4JMY pointed out
a while ago.
>
de SM2EKM
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