The perfect shim is a piece of 2 inch "standard" aluminum irrigation
pipe with 0.050 inch wall. 2 inch O.D. and 1.9 inch I.D.
I use it on my field day antenna which has
a water pipe mast. I slit it lengthwise and apply it like a piston
ring with a gap the width of the saw blade I clamp it with hose
clamps. It now fits perfectly in the saddles on my 2 element SteppIR.
Rick
On 10/13/2012 10:32 AM, Jim W7RY wrote:
Yup!
You should have enough play "slop" in the bearing (or tube top) and
rotor to be able to use 1-1/2 water pipe. I used it for many years in
Rohn 25 with a Tailtwiseter and both a TH6 and a 204BA mounted a foot
above the tower. Worst case you may have to shim around the pipe with
some flashing or other shim stock but very un-likely. Just Check it for
binding by rotating it around a few times.
73
Jim W7RY
-----Original Message----- From: Jim Hoge
Sent: Saturday, October 13, 2012 9:35 AM
To: towertalk
Subject: Re: [TowerTalk] Water pipe as a mast
Dan,
1 1/2" nominal pipe will have an outside diameter of 1.9 inches. This is
true for either schedule 40 or 80.
73,
Jim W5QM
________________________________
From: Dan Bookwalter <n8dcj@yahoo.com>
To: Tower Talk <TowerTalk@contesting.com>
Sent: Saturday, October 13, 2012 11:13 AM
Subject: [TowerTalk] Water pipe as a mast
I seem to have lost my mast pipe , and only have access to Homedepot ,
Lowes and such , I am only going about 1 ft above the top of the tower
so I figure heavy water pipe should work. Does anyone know what size is
close to what fits in a Tailtwister ?
Dan N8DCJ
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