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Re: [TowerTalk] Non-Conductive Mast Section

Subject: Re: [TowerTalk] Non-Conductive Mast Section
From: "Rick Karlquist" <>
Date: Thu, 8 Dec 2011 11:56:32 -0800
List-post: <">>
Your last idea is the best.  You have to have the tower
behind the Yagi and have the feed coax exit off the back
of the boom.  You have to mount it by attaching the back
of the boom to the tower, which doesn't require any insulated
pieces.  I can't imagine what KLM was thinking when
they said to mount it to an insulated mast, unless they
were thinking the top of the tower.  In that case, you
still have to bring the coax off the back of the boom.
If you tape the coax to the mast, you defeat the purpose
of an insulated mast.  Unless maybe you load up the coax
with ferrite beads.  The mast on the top of the tower needs
to raise the Yagi sufficiently high above the tower to
prevent interaction with it.  I'm not sure how high this is.
Again, your last idea is the best.

Rick N6RK

Jim Brown wrote:
> I want to side-mount a vertically polarized long boom 2M Yagi onto Rohn
> 25 or Rohn  35 (slightly larger gauge, made for Motorola, that's not the
> official designation). I may or may not put it on a rotator, and at
> first will lock it down in the direction of the local DX club repeater.
> I have another one of the same antenna that I'll mount horizontally.
> What I'm looking for are:
> 1) An insulated mast section, as recommended by the mfr (KLM) for
> vertical mounting
> 2) Some sort of suitable stand-off hardware or improvised method of doing
> it
> 3) Other hardware to make it work
> One idea I've toyed with is even more primative -- bolt a horizontally
> oriented 5 ft section of 2-in mast to the tower cross-braces, and bolt
> the antenna to it. This way I don't need an insulated section,but I've
> got to be quite careful about the orientation of the horizontal piece,
> since it (alone) determines the antenna azimuth.  I've got the 5 ft
> section of 2-in, but no suitable mounting hardware.
> Thoughts?
> 73, Jim K9YC
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