|Subject:||[TowerTalk] Re: Rohn 25 -- Semi- FreeStanding & TiltOver?|
|Date:||Sat, 29 Jan 2005 18:17:50 -0500|
Blake Bowers wrote:
Page 25G-1, and page 25G-2 of the Rohn consumer catalog. Their design charts, their design drawings.
This is very interesting.
I am planning a 4x4x4 concrete pad with three sections of Rohn 25 in it.
Two sections (A & B) will be offset in height from the other one (C) so as to overlap the joints for strength.
A B ______ _____ \ //--\\ / \--//____\\--/ C
Tower C will be approx. 50 feet, A & B approx. 30 feet. I am estimating that I can go another 10 feet above C and put a standard HF tri-band beam, and a VHF-UHF log-periodic up there.
I may side-mount a couple of antennas on A & B.
A & B, in additional to providing structural strength, will provide strength when I fold over C using Hinged Base Plate BPH25G (not sure how to snuggle A & B up to C with the plate in the way) or the two 7" swivel sections I have that I do not see in the catalog (the bottom half is a pair of 3.25L x 1.25W x 3/16" Thick steel with 1/2" holes for a bolt-axle, the top halves are 5" of tubular tower leg sections, 1.4" of the wide tower section welded between the steel bolt-axle legs and 3.75" of the narrow connecting tower legs above that & drilled for the normal pair of bolts).
If I haven't drawn the most confusing word-picture ever perhaps someone know the part number for these?
Anyhow, these past will probably work better in my scheme but I will need something either embedded in the concrete pad or perhaps use holes in a short section to run the bolt-axles through.
I have not yet figured out the winch & pulley arrangement.
-- Thanks! & 73, doc kd4e
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