[TowerTalk] Yagi Materials

[K3BU@aol.com]

In a message dated 12/13/2000 4:09:20 PM Eastern Standard Time, 
w9re@worldnet.att.net writes:

> I am attempting to build a shortened 80 meter beam.  I am going to use coils
>  and am patterning it from the M^2, 3 element 80.  I have found 2" 
fiberglass
>  rod (used to insulate 3" x .125 wall tubing from the boom) anyone know what
>  the bushings are made of that go from the 2" o.d. of the fiberglass to the
>  2.75" i.d. of the 3" element tubing?  Wish I could find fiberglass rod that
>  was 2.75" o.d. but it doesn't seem to be manufactured.  McMasterCarr only
>  shows 1.5" fiberglass rod available (so I felt lucky to find the 2" rod
>  locally).

MaxGain has 2" fiberglass tubing.
http://www.mgs4u.com/fiberg.htm
I am using it for loading coils for big verticals. Slice the aluminum tubing 
(2" ID), insert the fiberglass piece, I use self supporting copper tubing 
coils, which I clamp their ends to end of tubing with hose clamps. You end up 
with good Q of coil (air) and have enough strength to hold the resto f the 
element. You could use some plastic containers to cover the coils to keep the 
Indiana ice away from the turns.
Otherwise there might be some larger diameter fiberglass among the pole 
vaulters.

Yuri, K3BU

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