[TowerTalk] When is a 100' tower only 97' tall?

[David Aslin]

Guys, 

Spare a thought for those of us outside the US that have no access to
Rohn products.  Most of us have crank-ups.  That 6-section 120ft tower I
just took delivery of?  It's 96ft to the top at full height...

So when you hear my puny signal, it's the missing 24feet that are
weakening it ;-)

73

David G3WGN WJ6O

 

 

-----Original Message-----

From: towertalk-bounces at contesting.com

[mailto:towertalk-bounces at contesting.com] On Behalf Of John Becker

Sent: Wednesday, August 08, 2012 10:25 AM

To: towertalk at contesting.com

Subject: [TowerTalk] When is a 100' tower only 97' tall?

 

I was looking at the engineering drawing for Rohn 25G yesterday, and was

surprised to see that the total length of a section is 10' 0". This

*includes* the 3.5" that is inserted into the next section. The

effective height of a 10' section is only 9' 8.5". While not significant

for one section, it quickly adds up on a tall tower.

 

I wondered if this was possibly an error on the drawing, so I went out

to my tower and took a measurement. Sure enough, the distance from the

bottom of the first section to the bottom of the second section is 9'
8.5".

 

And here I've been thinking for years that my Rohn 25G-FK-68 tower was

really 68' tall, when it's actually only 66' 3". I would call this a

"truth in advertising" problem!

 

73, John, K9MM

 

 

 

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