Mike-
I'm not a naysayer, but I'd have one simple question: What would be inside
the fall radius of your newly designed tower? If nothing you're worried
about, go for it, sounds cool!
One thing you might want to consider is whether you want all the antennas to
always point together at the same azimuth. If not, you could plan separate
ring rotators like TIC Gens for the vaious antennas and forget rotating the
whole tower. Also keep in mind, the downward force on a crank up tower
should never be increased by adding guy wires. The extra downward force
could snap the raising cable. If you have ten acres, would there be room to
put up several tilt-over 50-foot towers? Might be simpler.
-Steve
N6SJ
----- Original Message -----
From: "Mike Ashby" <seabassm01@hotmail.com>
To: <towertalk@contesting.com>
Sent: Saturday, April 09, 2011 11:23 AM
Subject: [TowerTalk] HDX-555 Tower Modification Feasibility
>
>
>
> New to TowerTalk.....name 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
> seabassm01@hotmail.com Mike W7PIM. Thank you very much for your
> input.
>
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>
>
>
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