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Re: [TowerTalk] Differentiating Tri-Ex Towers

To: <>
Subject: Re: [TowerTalk] Differentiating Tri-Ex Towers
From: "Al Williams" <>
Date: Tue, 3 Aug 2010 10:06:47 -0700
List-post: <">>
The referenced link contains a nice drawing showing the difference in sizes 
for the of the various heights of the LM series towers.

I notice that the drawing is dated 1972!  Ten years ago Paragon Mfg. took 
over manufacturing the tower with First Call the sales outlet. The name was 
changed to SKY470 for the LM470 however some of the literature still used 
the Triex pages. At that time the tower steel was changed to a higher 
strength. Maybe the dimenstions were also changed although my SKY570 
instruction manual has the same dimensions, except for the extended and 
nested heights, as the referenced link. These two heights are specified as 
68' and 24' 6".
Paragon sold out to an eastern company who shortly sold out to Tashjian.

The original question was what is the difference in LM, HM, & HD versions 
and it would be nice to know what the initials stand for. I suspect that HD 
stands for heavy duty, possibly M for manual pull down as one of my Triex 
literature pages refers to LM470HD as manual pull down with LM470HDSP as 
motorized pulldown!

----- Original Message ----- 
From: "Mickey Baker" <>
To: <>
Sent: Monday, August 02, 2010 12:33 PM
Subject: Re: [TowerTalk] Differentiating Tri-Ex Towers

Allow me to document an answer to own posting for the record. A lot of you
were helpful, but Ron, W8RJL, sent me exactly the information I was seeking
in a form that I understood immediately.

Tri-Ex produced a number of different size tower sections for telescoping
towers. This "Cross Section Details" drawing identifies the sections by
"Section No." in the drawing, with dimensions of sections 5, 6, 7 and 8 on
this drawing.

A table at the bottom of the drawing identifies LM and HM towers current as
of the drawing (1972) and the sections used for each tower. The HM-354, for
example, uses section numbers 6, 7, and 8, where the lighter LM-354 uses
smaller sections 5, 6, and 7.

Tashjian's drawing of the modern LM-354HD identifies that it uses section
numbers 6, 7 and 8.

I don't know if there are addition changes, but it seems logical that an
HM-354 has been re-designated  "LM-354HD."
Concrete Base designs appear identical - I can find no differences in these

If anyone has more information, please reply!

You can view the drawing Ron sent me at:

Mickey, N4MB

On Sun, Aug 1, 2010 at 9:55 PM, Mickey Baker <> wrote:

> How would one tell if a tower were a LM-354, LM-354HD or an HM-354?
> Should there be a data plate or descriptive weld?
> Thanks and 73,
> Mickey, N4MB

Mickey Baker
Fort Lauderdale, FL
“Tell me, and I will listen. Show me, and I will understand. Involve me, and
I will learn.” Teton Lakota, American Indian Saying.

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