Definitely sounds overloaded.
I have an HDX555 with a 4 element SteppIR 2 ft above the top of the
tower, and an XM240 9 feet above that, and a 20 ft mast. That's a total
of 16.4 sq ft (of antenna plus mast) on a tower rated for 29.5 sq ft at
70 mph, but this load max'es out my tower at 74 mph average with gusts
to 95 mph.
For some free software to make these calculations go to
http://www.arrl.org/qexfiles/
and download the file labled TRANVITY.ZIP. Also download the following
pdf file which gives some good explanations of the calculations.
http://www.arrl.org/qex/1123.pdf
Jerry, K4SAV
9K2HN wrote:
>Hi,
>
> I'm installing now two optibeam antenna's on a US Tower HDX-555 the
>antenna are:-
>
>Ob16-3 16 element 10, 15, 20m weight 45 KG and wind load 12.6 sq/ft
>Ob40-4 4 element 40m monobander weight 75 KG wind load 16.2 sq/ft
>
>total is 28.8 sq/ft and 120 KG (Lbs 264)
>
>US tower web page says it can handle 70 MPH Winds -- 29.5 sq. feet; 350
>lbs. (159 KG)
>
>so I'm close to the limits.
>
>My question is; can the HDX-555 when it is fully erect handle them in
>strong wind? any experience with similar installation?
>
>I'm asking now before it is too late. we don't have very strong wind it
>is hardly reaching 110KM
>
>
>your comments will be appreciated
>
>
>de 9k2hn
>Hamad
>
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