[TowerTalk] Mounting 1.25 stinger in 3" tubing?

Richard (Rick) Karlquist richard at karlquist.com
Sat Jun 8 17:57:42 EDT 2019

Get a 1 foot length of 1 1/4 inch PVC Schedule 40 pipe
which will fit loosely over the 1 1/4 inch aluminum.
Saw four lengthwise slits a few inches long in one
end, at 90 degree spacing around the PVC.  Clamp
this to the aluminum with a hose clamp.

Repeat above using 3 inch PVC Schedule 40 pipe which
will fit loosely over the 3 inch aluminum.

Use standard PVC plumbing parts to connect the 1 1/4 inch PVC
pipe to the 3 inch PVC pipe using PVC pipe glue.

Jumper around this plastic assembly with a piece of
aluminum wire clamped to the aluminum tubing with
hose clamps.  This provides electrical continuity.

I built six 40 meter verticals this exact way (except
the stinger was 2 inch aluminum).

Note that the aluminum is inside the PVC in both cases,
and you do zero machining of the aluminum.

Rick N6RK

On 6/8/2019 9:08 AM, Jeff Blaine wrote:
> I'm rebuilding my 40m 4-sq verts and have some 15' lengths of 3" OD/ 
> 2.75 ID tubing to use on the base end.  And for the "stinger" end, I 
> have some tapered elements off an old yagi that are 1.25" OD on the 
> bottom of the 17' length.
> Other than buying some concentric lengths of aluminum to step from the 
> 1.25 OD stinger up to the 2.75 ID base tubing, any good ideas of an 
> interposer that would take up some of the space?
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> www.ac0c.com
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