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## [TowerTalk] Modeling shut-fed tower's.

 To: [TowerTalk] Modeling shut-fed tower's. fmart@nil.fut.es (EA3KU(Fernando Martinez)) Fri, 18 Apr 1997 22:02:14 +0200
 ```Hello Fellows. I done some test at scale ( 40 feet tower with a 5 ele. 28 Mhz monobander with parasits elements grounded to the boom ). The results was expectacular on 40 meters ( compared with my 2 ele monobander at 60 feet hight, all ways the monoband was better but the I broke easy severals pile-up's with the shut-fed tower. Now, in orde to have a single tower for al bands, I am working to set up a 90 feet self-supported tower ( 1.5 meter x 1.5 meter in the base and 0.55 meter x 0.55 meter at top ) and try to use this on 80 an 160 meters. Up this tower I will put a 2 inc. diameter mast ( 1/4 inc. wall ) of steel to support next to top of the tower a KT34XA-HD and 10 feet up a 2 ele. mon. for 40 meter. I read in a book, a formula to calculate the equivalent electrical length of this shut-fed tower (using basically the physical hight of the tower and the surface of the top hat) , but the elements both antennas, the KT34XA and 402-CD ) are isulated's from the boom. How affect that the elements are isulated of the boom to caltulate the hat surface ?. Wich antenna I can use to calculate the equivalent surface, the nect of the tower or the antenna at top of the mast ?. I will aprecciatte so much any comment or experience . 73 es DX. Fernando. EA3KU -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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