That's easy Brian.
If the boom to mast is at the center of the boom, then one has 10.25" on that
side of the right triangle; 17.333 inches on the other side of the right
triange; and 20.13" turning radius.
Art
--- On Wed, 5/20/09, Brian Gieryk <ke6iyc@mac.com> wrote:
From: Brian Gieryk <ke6iyc@mac.com>
Subject: Re: [TowerTalk] MACAntenna
To: "Pete Smith" <n4zr@contesting.com>, towertalk@contesting.com
Date: Wednesday, May 20, 2009, 8:11 AM
Perhaps a typo on their site, or an oversight, but how cane one have a
turning radius (20 ft, 1 in.) LESS than the boom length (20 ft, 6 in.)?
Brian
KE6IYC
On May 20, 2009, at 4:41 AM, Pete Smith wrote:
> This year at Dayton, there was a vendor (www.mactenna.net)
> demonstrating something called the SB20-10 Simple Beam. The basic
> principle was described in a QST article in September 2008, applied
> to a wire dipole, and I remember at the time thinking "You've
gotta
> be kidding." Now, however, the inventor has incorporated the idea in
> a 3-element yagi, and unless he has cooked the books, the EZNEC
> models look pretty good. On all 5 bands between 20 and 10 meters,
> the models show very similar pattern and gain numbers and excellent
> SWR bandwidth, all without motors, moving parts (other than relay
> contacts), and at a decently low price.
>
> The manufacturer's web site is very forthcoming with information,
> which tends to inspire confidence. Still, I'd appreciate hearing
> what the gurus among us think.
>
> 73, Pete N4ZR
> New Articles Daily - the Contesting Compendium at
http://wiki.contesting.com
> The World Contest Station Database, updated daily at
www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net
>
>
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