Here's another N4KG 'NEVER DO'
NEVER use a House Bracket to support a non-self supporting tower,
unless you have at least one set of guy wires 30 ft or less above the
bracket.
Besides the Vibration / Noise issue, if you get a really STRONG
wind and lose your tower, you will also have a HUGE repair bill
for your house.
There is nothing STRONGER, SAFER, and more COST EFFECTIVE
than a PROPERLY GUYED TOWER.
Note that for tower heights under 70 ft, Rohn shows a 35 ft (50%)
guying radius for their (discontinued) fold over tower intallations.
Tom N4KG
On Sat, 31 Aug 2002 10:27:07 -0700 "Stan & Patricia Griffiths"
<w7ni@easystreet.com> writes:
> Hi Joe,
>
> Here are a couple of suggestions that might help you:
>
> Install the house bracket before you pour the base concrete. This
> way, you
> can move the tower base slightly to get it perfectly vertical, and
> THEN pour
> the concrete. This is much easier than trying to get the house
> bracket in
> exactly the right place after the base is set in concrete. Here is
> what I
> would do:
>
> 1. Install the house bracket where you want it. I am sure you will
> get
> advice on how to make the bracket installation strong and reliable,
> like
> bolting through the wall and backing up the bolts with some
> additional
> pieces of wood inside the house.
>
> 2. Dig the hole below the house bracket and put in the gravel.
>
> 3. Assemble two tower sections so you have a 20 foot piece.
>
> 4. Stand the tower in the hole and attach it loosely to the
> bracket.
>
> 5. Adjust the tower for vertical by moving the base slightly in the
> hole.
> You can check this using a carpenter's level on the tower legs.
>
> 6. Build a shallow concrete form around the tower where it is close
> to the
> surface of the ground and pour the concrete to fill the hole.
>
> Note 1: Make sure no concrete can plug the tower legs. The tower
> legs MUST
> be able to drain water into the gravel. You can do this by adding a
> couple
> more inches of gravel after the tower is positioned vertically and
> before
> you pour the concrete.
>
> Note 2: The concrete should extend above the surface of the
> surrounding
> ground by a least a couple of inches so water will not stand around
> the
> tower base. Use a little "extra" concrete so the concrete base is
> actually
> higher in the center so that any water that would want to stand on
> the
> concrete surface around the tower legs will run off.
>
> Good luck with your tower install.
>
> Stan
> w7ni@easystreet.com
>
> ----- Original Message -----
> From: "Joe" <jarmstrong@warpnet.net>
> To: <towertalk@contesting.com>
> Sent: Monday, August 26, 2002 9:40 PM
> Subject: [Towertalk] Tower Buidling 201
>
>
> > Tower Building 201
> >
> > Need help with putting up a new tower. This is my second tower,
> the first
> was on a hinge.
> >
> > I have 5 sections of Rohn25G and one top section. I intend to use
> one of
> the sections as a base. For now I would like to place a Diamond HF
> vertical
> (mounted on the side) and a Cushcraft 144/440 on top w/a rotor.
> >
> > My house has a 13' foot peak and a 3' overhang. I think it would
> be best
> to mount the bracket to the wall. I am told by Rohn to not go over
> 30' above
> the bracket.
> >
> > I am also told by Rohn to dig down 4' with 6" of gravel for the
> base.
> >
> > My goal is to have a decent tower that I can use for quite awhile
> and grow
> with. My objective is to build it this fall AND TO DO IT RIGHT. That
> is
> where you guys come in. Do you have any suggestions to help me meet
> my goal?
> >
> > Thanks for helping me out,
> > Joe
> > KB9OPY
> >
> >
> > --- StripMime Report -- processed MIME parts ---
> > multipart/alternative
> > text/plain (text body -- kept)
> > text/html
> > ---
> > _______________________________________________
> > Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> > Call 888-333-9041 to place your order, mention you saw this ad and
> take an
> additional 5 percent off
> > any weather station price.
> > _______________________________________________
> > Towertalk mailing list
> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> Call 888-333-9041 to place your order, mention you saw this ad and
> take an additional 5 percent off
> any weather station price.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
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