[TowerTalk] Force 12 EF420 manual

[Jim Thomson]

Date: Sat, 4 Feb 2017 05:19:55 +0000 (UTC)
From: Bob K6UJ <k6uj at pacbell.net>
To: <towertalk at contesting.com>
Subject: [TowerTalk] Force 12 EF420 manual

Anyone have a manual for a Force 12 EF420 or a EF420/240 ?I am interested in the taper schedule used in a EF420.? I am thinking of making 
one from my collection antenna parts from Force 12 yagis I have had.

BobK6UJ

##  Is this for the 37 ft eles..or the  44 ft eles.      If its the 44 ft eles, I have 2 of em, sitting on saw horses  right now in the back yard. 
  The 44 ft ones start off with 1.25 inch OD, but are triple wall, then it tapers down a bit, and is double wall, then the insulator, then
from insulator to tip its all single wall.  Each ele weighs  aprx 12 lbs.     I have run it through the dx eng mech software and its very robust.

##  the triple wall inner portions consist of .083 wall, then some .058 wall insider that, then some .035 wall  inside that.    Then they  swedged the
entire mess down, to fit the  .750 fiberglass center insulator. 

If you want exact exposed lengths,  diameters and wall thickness of each section, and overlaps, etc, etc, contact me off list.    Both the 37 ft and 44 ft
40m eles used LL wires, alumo weld.  These cam easily be replaced with coils across the oem or slightly longer insulators that are aprx half way out
each ele half.   T bars would also work, and would be very short on the  44 ft eles. 

Jim  VE7RF