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Re: [TowerTalk] Bracketed but Unguyed Monopole

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Bracketed but Unguyed Monopole
From: "john@kk9a.com" <john@kk9a.com>
Date: Thu, 15 Sep 2016 09:47:29 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
It sounds like you have even harder soil than I do! I think that bracketed
tubular crankup towers are available.  Actually Rohn 25 would probably
work perfectly if you were not against lattice towers for several reasons.

GL
John


To:     towertalk@contesting.com
Subject:        [TowerTalk] Bracketed but Unguyed Monopole
From:   WT4BT-Barclay Thomas <wt4bt@blomand.net>
Date:   Tue, 13 Sep 2016 15:08:48 -0500

My aim: Vertical support for a Hexbeam at about 30-35 feet.
Space for guys is severely limited by property lines, trees and other
structures
I cannot use a lattice type tower for several reasons.
Ground here is clay over ledge/bedrock and only 18 - 24 inches deep so
anchors
may be marginal without rock drilling.
I am in a 70 mph wind zone (90 mph @ 30 sec. gust zone) here on the
Cumberland
Plateau in So. Central TN.

What I am thinking of:
Mast system like the Penninger Radio ?Tipper? 35 foot using 2? x 0.25?
(rather
than the stock 0.125") wall tubing (8?,10? or 12? sections) which would be
bracketed to the shack building (separate from the main house) at about the
10-12 foot level.

Yaesu G-450, or similar, rotator at top of mast turning a Hexbeam with
maybe a
6 meter short-boom yagi (3-5 elements).
There would be 1 or 2 pulleys below the rotator for inverted V or L antennas
and ?experimental wires? as the mood strikes.

Base of mast would be in concrete (TC-24 concrete base mount) but the amount
poured might be sub-optimal (can go somewhat wide but not deep).

As noted above, guying will be a compromise situation.

Due to roof overhang on main house bracketing to it, or trying to mount a
shorter mast off the face of a dormer is not a strong option. Roof mount a la
Glenn Martin is possible but the roof pitch is greater than 12 in 12 so
getting
up there to do any work is not an option for me.

Questions:
Can I get away with the top 25 or so feet of mast being unsupported
(unguyed)?
Are there any other suggestions or thoughts for doing what I want?
Different mast or tubing suppliers?

Mac / WT4BT

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