Date: Fri, 16 Aug 2019 17:44:28 -0600
From: Glenn Haffly <k5zeglenn@gmail.com>
To: TowerTalk@contesting.com
Subject: [TowerTalk] Force 12 Antenna
>Anyone have a manual for a Force 12 Delta 4 XL? It's a 9 element beam for
>40 through 10? Looking for the weight , wind load , turning radius and
>projected surface area. Could not find any info online.
>Thanks Glenn
## watch out! Those F12 windload specs are incorrect. They used the
old 222- C spec....
which is the actual projected area of a cylinder.... multiplied by .67
## IE: when F12 sez an ant is .... 10 sq feet.... its really 15 sq
ft. You have to multiply F12 spec by 1.5 to get reality.
## towers are all rated using .....projected area of a cylinder.
## This is how towers get overloaded.
## JK ants...and optibeam have done their windload specs the correct
way.
## These days, the projected area of ALL the eles of a HF yagi are
simply added up, to obtain .... total projected area.
## Typ the total eles area is greater than the boom area.... so the
total eles area is used for the spec.
Jim VE7RF
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