I have a hdbx40 that I installed in 1990. I have a klm KT-34a
on top. I dug a hole about 4.5 x 4.5 feet and 5 ft deep for
the base ( that size was in the permit application which was based
on a hdbx48 tower).
Up until last August, I thought that everything would stay up
forever HI . plans change however. Prior to August, We had
only seen max winds in the 55mph catagory so no sweat. In August
A severe storm blew through ( a nearby airport recorded 115mph,
Luke AFB had 120mph) and the KLM KT-34a element to boom plastic
bracket tore loose ( very interesting stress cracks) on at least
one element ( I assume more cracked).
The tower came through without any problems.
I have decided to replace the KLM with Force12's, Yes, I am planning
on putting a elite 3 element 20 meter and a 4 element 10 meter. Not
a big wind load in any case.
The recent discussions on this list swayed my decision, thanks
to all from a new lurker.
I actually am toying with the idea of interlacing the 10
onto the 20 meter's boom but since Force12 does not give
any real dimensions, I must wait until I have the beasts
to model it.
for your info,
On Dec 5, 12:28pm, Gene Smith wrote:
> Subject: Rohn HDBX-48
> Who out there has information or an opinion on
> the Rohn series HDBX-48. This is a 48' self
> supporting tower. I am considering putting
> up this tower at my QTH in Medina, OH (Medina
> County). I'll be putting a Cushcraft A3S or
> equivalent beam on top of it. I know this
> is not recommended by Rohn because they say
> not to use anything with a boom longer that
> 10'. The A3S has a boom of 14'. I might
> guy the tower, somewhat weekly with the guy
> anchors about 10' from the tower just for
> a little extra support. My main concern is
> the Rohn manual for the HDBX says to replace
> any loose rivets with bolts. WHAT? You mean
> to tell my the x-braced rivets might come out?
> I assume this means an annual trip up the tower
> to check out all the rivets, carrying a cordless
> drill and pocket full of nuts and bolts. How
> does one climb this tower with the X braces?
>-- End of excerpt from Gene Smith
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