[TowerTalk] Bracketed Rohn Specs

[K7LXC@aol.com]

In a message dated 07/22/2000 7:05:53 AM Pacific Daylight Time, 
jhisson1@columbus.rr.com writes:

> When looking at the Rohn 25G Bracketed Specs, its states upper brackets at
>  30' and lower brackets at 15'.  Is this an AND or and OR?  i.e., do they
>  mean that you have to have both or one or the other?

    They want you to have BOTH brackets. In the 'olde days', conventional 
wisdom said that you could go up 40' above a housebracket. In these 
conservative and perhaps more realistic times, that would not be recommended. 
If you've ever climbed one of those, you'll KNOW what I mean - moderate to 
high pucker factor!
>  
>  If both are required, then I could not put up the tower as I cannot go to
>  30' for one of the brackets.
>  
    Well, that's ONE scenario. Tony, K1KP, wrote a very interesting and 
informative article (QST, August, 1996) on installing a housebracket complete 
with engineering/forces data. I've got reprints of it for a buck (Box 572, 
Woodinville, WA, 98072).

    The other thing you need is the little blue pamphlet from Rohn - 
"Manufacturer's Technical Information for Bracketed or Self Supporting 
Towers". It has all the info in one place including free-standing 25, 45 and 
55G specs. Check Champion Radio Products website for ordering info 
(http://www.championradio.com).

>  If only one is required, then at 40', there would be 25' of tower sticking
>  out the top.  Would that allow me to put 25' of tower as well when the
>  bracket is at 13'?  (for a total of 38').

    Probably but it's load and windspeed dependent (Franklin County is only 
70 MPH windspeed zone - the lowest rating they give).

Cheers,   Steve    K7LXC
Champion Radio Products
Tower Tech

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