[Top] [All Lists]

[TowerTalk] HDX-555 Tower Modification Feasibility

To: <>
Subject: [TowerTalk] HDX-555 Tower Modification Feasibility
From: Mike Ashby <>
Date: Sat, 9 Apr 2011 12:23:15 -0600
List-post: <">>

New to is Mike,  W7PIM and I would very much 
appreciate any and all constructive input into my feasibility research. 
 I have read over much of the archives regarding the things I want to 
accomplish and now I need all of you tower/antenna guys out there to rip
 into this challenge.   Overall objective:  Modify my current HDX-555 (555), to 
hold and rotate
 2 or 3 large yagis.  (ie:  2 el. on 40, 2 X 6 el on 20, homebrew 
antennas)    I have not listed any loading or weight numbers here yet 
because I am dealing in concepts at the moment.  Those details will come
 in the detailed math analysis and design to follow.    Objective #1: 
 Design and construct a bottom section that would raise the tower an 
additional 20 ft.  Plan would be to use the current winch and lift cable
 to raise the current 555 to it's normal height and then use a separate 
winch and lift cable to then lift the entire 555 the additional 20 feet 
inside the new tower section.  Objective #2:  Design and 
construct a tower rotating system that will mount on top of a very heavy
 duty pedestal tower or large post section about 3 ft. tall and then 
secure the entire assembly from objective #1 to the top of the 3 ft. 
section.  This brings me to Objective #3:   Design and construct 
guy rings for the 555 that are custom fitted for each section and would 
allow the entire tower to be rotated.  Now, before I stir up all the 
naysayers out there, let me tell you why I want to do this.  Getting to 
old to climb tall towers,  and want to homebrew antennas.  Need to move 
them on and off and up and down tower.  This would give me the best of 
all worlds for what I need.  Resources:  Very supportive wife, 10
 acres of land, son with MS ME, another son with MS EE, a son-in-law 
with ME, 2 brother-in-laws that are certified ASME+++++ welders and a 
machinist in the family.  Have access to extensive Finite Element 
Analysis support, a can do attitude and lots of experience at doing 
things that most people won't tackle.  Have also reviewed K7NV's 
outstanding paper on "Guyed Tower Behavior".  I will share my findings 
and progress with anyone that is interested.  Send replies to   Mike   W7PIM.    Thank you very much for your 

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>