[Tower-Speak] Speaking of towers...

[Ray Brown]

----- Original Message ----- 
From: "Howard Weeks" <weeksh at bellsouth.net>

> That woke me up!  I do have a question for someone...
>
> I have 120' of Rohn 25 tower sections that I am thinking of putting
> up around here somewhere.  From time to time, I have looked around
> the web for information on the design of ground anchors and the size
> of guy wire to use.  Either I haven't looked hard enough or there is
> very little out there on that subject.  I did find a Rohn document
> that described the guy wire spacing and number, etc. but nothing
> about sizing them.

  I was going to say, I thought the physical limit on Rohn 25 towers was
around 100', otherwise you run into a real possibility of an ice storm
dropping your tower... depends on the overall loading and anticipated
maximum wind speed... anyways, I think the standard is 3/16" or 1/4"
wire rope, but yeah, I can't find how often to go with them... maybe
as much as every 20'?

> Plan to put a TA-33 Mosely HF beam and two 14 element 2 meter beams
> on top.  Have also considered buying 4 more sections and putting up 2
> towers at 80' so I can hang dipoles between them also.

  I looked on the ol' bay place, there's somebody in Ohio that's selling what
looks like 3 pieces of Rohn 25. It's not BX because it's not tapered, but it
looks about the same size as the bottom section of BX, so my SWAG is
that it's 25. The seller doesn't know what he has. :-(

> There must be some standard designs around for various common heights
> and wind load, etc.

  Well, one of the places I trust on towers is WB0W, and for Rohn 25G,
I think it says it needs just one permanent guy 80% up the final installed height.
They're at http://www.wb0w.com/Rohn/rohn25G.htm .But just use
Google, there's about 9,000 hits on just "Rohn 25". Happy hunting!

                _Ray_        KBØSTN