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Re: [TowerTalk] 2" OD tubing inside a Rohn 25AG2

To: <>, <>, <>
Subject: Re: [TowerTalk] 2" OD tubing inside a Rohn 25AG2
From: "Stan Stockton" <>
Reply-to: Stan Stockton <>
Date: Tue, 4 May 2010 14:23:47 -0500
List-post: <">>
For what it's worth, I was always a little concerned about the 
installation at my parents house when I was a kid.  It is 70 feet of 
Rohn 45G on a hill with a little 2L 40 at the top of the tower, a 4 
element 20 up about 8 feet and a 4 element 15 at about 16 feet above the 
top of the tower.  The mast is 24 feet of 2 inch OD x .375 wall, 6061-T6 
extruded aluminum.  I think I would really be concerned if that mast was 
.250".  It has now been up over 35 years and never a slight hint of a 
problem.  Two levels of guys and two of the three directions are to 
large oak trees. All that still stands to support a star welded out of 
rebar that lights up at Christmas time for my mother and everyone in 
town who enjoys seeing it. :-)

Stan, K5GO

----- Original Message ----- 
From: <>
To: <>; <>
Sent: Tuesday, May 04, 2010 12:38 PM
Subject: Re: [TowerTalk] 2" OD tubing inside a Rohn 25AG2

> In a message dated 5/2/2010 9:59:22 P.M. Pacific Daylight Time,
> writes:
>>  Tom,  There is no way I would use ANY aluminum  tubing as a mast at 
>> any
> time.  In this case there are three
> problems.....aluminum....tubing.....length.  Tubing is not pipe and 
> that  length of it with any substantial weight,
> i.e. windload, is inviting  disaster.  Another section of tower is the 
> correct and safe way to  achieve the height you're after.  It's 
> cheaper to
> do it right once than  to do it twice to GET it right.  For what it's
> worth....I'm no  expert.  I'd be interested to see what K7LXC has to 
> say about
> your  question.
>    Well, like the engineers say - it depends. Of  course for an 
> aggressive
> installation of stacked big yagis or a moderate  installation in a 
> high
> wind area you should use a carbon alloy steel tubing  mast of 
> appropriate
> dimensions and strength. For small to moderate  installations many 
> times an
> aluminum mast (35 kpsi yield strength) will work  fine. Not everyone 
> needs a
> chro-moly mast for $600. Heck, if you're just  putting up a 3L 
> tribander at the
> top of the tower, even water pipe will be  okay since there's very 
> little in
> the way of bending moment on the mast.
>    There's a whole chapter on masts in my UP THE  TOWER book available
> from _www.championradio.com_ ( .
> Cheers,
> Steve    K7LXC
> Champion Radio Products
> 888-833-3104
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