HELLO ALL:
The advice that Steve K7LXC gives is often quite sound and on the money.
I've had a HDBX 48' up for about 9 years with a TH7 on top. I traded the
TH7 in for a Force 12 C3E it's less then half the weight and certainly
surpases the TH7 in performance. I have had no problems with this beam
or any other cracks in the rotor plate yet... I do have one of my
friends climb the tower periodically for a look see... all is great
shape so far..
de Al / NA1I
Dave Jordan wrote:
>
> When we used the HDBX we used to run black pipe all the way to the pad and
> mount
> the rotor on a short pipe just above the pad...that way much of the
> twist force is taken off the tower and all it has to do is hold up the pipe.
> Never
> had any problems with loose revits, etc. when we used that type installation
> and we put some pretty big beams on them...
>
> HAVE FUN,
> dave
>
> ======
>
> K7LXC@aol.com wrote:
>
> > In a message dated 99-04-14 19:21:10 EDT, jfleming@shelbynet.net writes:
> >
> > > I was surprised to read that the Rohn self-supporting HDBX40 and 48 will
> > > support 18 sq ft, but only a 10 ft boom. Am I missing something? Not
> > > much with a 10 ft boom... ?? Seems like even a "little" beam would be
> > > more than that.
> >
> > Well, and you'd be right. Rohn BX is basically TV tower and has very
> > little torsional resistance (it's for TV antennas, remember?). Anyway,
> > bigger
> > antennas will eventually beat up the tower resulting in the rotator plate
> > breaking as well as cross braces popping off.
> >
> > And they're real meat grinders when you have to work on them. Be real
> > careful if you want to install one.
> >
> > Cheers, Steve K7LXC
> >
> > --
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>
> --
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--
THOSE THAT CAN, DX ! THOSE THAT CAN'T, DX ON NETS !
--
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