WOW!! You guys are a lot smarter than I look....
----- Original Message -----
From: "Mike Gilmer, N2MG" <n2mg@eham.net>
To: "towertalk" <towertalk@contesting.com>
Sent: Monday, October 14, 2002 7:50 PM
Subject: [Towertalk] Yagi Rotational Center
> N4KG wrote:
> > Mathematically, calculate the rotational radius to
> > the reflector tip and the director tip from points along
> > the boom until they are equal.
>
> > (R/2)^2 + Br^2 = Rr
> > where R = Reflector Length,
> > Br = distance on boom from reflector to test point
>
> > (D/2)^2 + Bd^2 = Rd
> > where D = Director Length,
> > Bd = distance on boom from end director to test point
>
> Sharpen that pencil and renew those algebra techniques
> and, FWIW, this reduces to:
>
> Bd = 0.5 * ( ( ( (R/2)^2 - (D/2)^2 ) / Bt ) + Bt )
>
> where Bt (total boom length) = Br +Bd
>
> 73 Mike N2MG
>
>
>
> _______________________________________________
> AN Wireless Self Supporting Towers at discounted prices,
> See http://www.mscomputer.com
>
> Wireless Weather Stations now $349.95. Call Toll Free,
> 888-333-9041 for additional information.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
|