If you want to see what you might have to do to reinforce your house to
accommodate a Rohn bracket, check out QST of August 96. The article also
suggets that ARRL volunteer consulting engineers might be able to assist in
designing similar reinforcing schemes. Call ARRL HQ at 860-594-0200 (per
the article) for the name of the nearest volunteer engineer.
-Gene Smar AD3F
-----Original Message-----
From: k6ll@juno.com <k6ll@juno.com>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Monday, November 16, 1998 11:26 AM
Subject: Re: [TowerTalk] House Bracketed ROHN 45G Question
>
>
>On Sun, 15 Nov 1998 23:13:18 -0700 "K7HPH" <k7hph@xmission.com> writes:
>
>>There are two house brackets mounted according to ROHN specs with =
>>respect to load handling capability. However, they are mounted at 8
>>feet =
>>and 16 feet instead of the 16-35 feet called out in the ROHN =
>>specification.=20
>>
>>My question is this. I have another section of 45G that I would like
>>to =
>>add to bring the tower to 50 feet. If I add the section, what would be
>>=
>>the load handling capacity of the tower with the house brackets left
>>at =
>>their current heights of 8 and 16 feet? Also, I live in a 70 MPH wind
>>=
>>zone.
>
>Well, the top of the tower will be 34 feet above the top house
>bracket. If you look at the 100' bracketed tower in the Rohn
>book, it coincidentally is also 34 feet above the recommended
>top house bracket and is rated for 5.5 sq feet at 70 mph,
>2 sq feet at 80 mph, and unsafe at 90 mph. That's a starting
>point anyway. Note that the house connection has to withstand
>an 1810 pound horizontal force, and the connection to the structure
>has to be designed "by others." That's a pretty good tug. I don't
>think my house would support that!
>
>Dave Hachadorian, K6LL
>Yuma, AZ
>K6LL@juno.com
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