Ken,
What have grown over the years are the antenna´s size and their wind
loads...The TA33 has nothing in common with the actual trapless antennas
Force 12, SteppIRs, Obtibeams....73
Fernando EC1CT // KD0IGJ
E-Mail: ec1ct@esbesaya.com
KR DX Group
--------------------------------------------------
From: "WA8JXM" <wa8jxm@gmail.com>
Sent: Friday, May 13, 2011 2:18 PM
To: <towertalk@contesting.com>
Subject: [TowerTalk] concrete bases for freestanding towers
> Many years ago I had a 64' freestanding tower with a 3el triband beam
> (TA-33) on it. The base was only 2 cu yards of concrete. As far as I
> remember, that was all the manufacturer (Heights) recommended at the time.
>
> Now when I look at anyone's recommendations, the base requirements are
> much larger. Rohn (and others) recommends 3 cu yards even for a 40' BX
> tower. I had used only 1 cu yard for a freestanding 40' tower.
>
> Is my memory faulty, or have the recommended bases grown over the years?
> Were the old recommendations inadequate, or has everyone grown super
> conservative over the years? "If one yard is adequate, three will be
> better, so let's use five yards"???
>
> As one ham commented on the air yesterday, the only failures he has ever
> heard of were in the tower itself, not the base falling over.
>
> Ken
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