[TowerTalk] Rohn 25 and stacking questions

[Pete Smith]

I can't speak for AO (MININEC based?), but my understanding is that HFTA 
does not do an accurate job of reflecting the relationship between boom 
length and stacking distance.  In the modeling I did with NEC-2 for my 
short-boom tribander stack, anything over 28 feet began to affect 15-meter 
performance (especially F/B) more than was acceptable.  At the time, I also 
modeled TH-7 stacks with 24-foot booms, and at least in the terms I was 
concerned about, 30-34 foot spacing was about as much as I would have wanted.

73, Pete N4ZR

   At 04:17 PM 3/20/2007, Joe Subich, W4TV wrote:

>Steve,
>
>HFTA and AO show rather good results with 40/80 or 50/90 foot
>stacking.  The 40' spacing improves performance slightly on
>20 meters and does not overly impact 10 Meter performance -
>particularly if the 10 meter antenna uses most of the boom
>length.
>
>73,
>
>    ... Joe, W4TV
>
>
> > -----Original Message-----
> > From: towertalk-bounces at contesting.com
> > [mailto:towertalk-bounces at contesting.com] On Behalf Of K7LXC at aol.com
> > Sent: Tuesday, March 20, 2007 2:27 PM
> > To: towertalk at contesting.com; k9kl at centurytel.net
> > Subject: Re: [TowerTalk] Rohn 25 and stacking questions
> >
> >
> >
> > BTW have you modeled your proposed stacking? Forty  feet
> > seems like a long
> > ways to separate them.
> >
> > Cheers,
> > Steve     K7LXC
> >
>
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