[TowerTalk] believing antenna manufacturers

[n4kg@juno.com]

N4KG comments inserted below.

On Wed, 30 Jan 2002  "Rajiv Dewan, N2RD" <n2rd@arrl.net> writes:
> 
> There are two ways a structure can withstand wind forces:
>
> 1. Be very robust (most of the older antennas, if they could survive)
> 2. Be compliant (like F12 antennas)
> 
	My Telrex 3L20 with 1.5 inch dia elements at center
	is an example of #1.  It weighs 75 lbs.  I have one
	assembled on a 10 ft waterpipe mast in the yard.
	A *large* tree limb fell on the 3 inch OD boom,
	bending the waterpipe mast.  The Telrex antenna 
	was NOT damaged.

	My old style modified Wilson 5L10's are an example of #2.
	They use a 6 ft center piece 5/8 inch OD and 1/2 inch 5 ft tips.
	Two END tips bent in high straight line winds.  I 'assume'
	they caught some 'flying debris' since the elements should
	have been able to survive close to 100? mph winds (and 
	the intermediate element tips did survive undamaged).

	Tom  N4KG
	
> At least for tall skyscrapers, 2 is a better strategy.
> I think that it is the same for ham antennas too.  The latter 
> strategy leads
> to lower weight, turning moments, etc.  A winning combination and 
> better
> design in my opinion.
> 
> Regards,
> Rajiv, N2RD
> 
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