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1-10 of 10 messages
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Rohn Tower install
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by KE7YEJ on December 21, 2008
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I have a 40' Rohn Tower. I would like to place it beside the house and attatch it to the 20' peak. I would like to use a cable attatched at the peak to raise and lower it on a hinge for work. How much concreat at the base and how should it be attatched at the peak of the house? Thanx Ron
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RE: Rohn Tower install
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by NZ1I on December 21, 2008
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Hi Ron,
If the tower is Rohn 25G then a base of 4ft x 4ft x 4ft is needed. And you will need to place some rebar in the concrete as well. Look on Ebay for a Wall Mount for Rohn Towers. There are 3 different types and the main difference in them is the Distance from the House to the Side of the tower. I believe the biggest distance is 36" so be prepared to dig your hole close to your house foundation. Google Rohn Tower ( 25G, 45G, 55G etc.)and you should be able to find the Exact Specs you need to plant the tower properly. And be Sure to Follow Them!
Good Luck and Be Safe!
73, Kevin NZ1I
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RE: Rohn Tower install
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by KE4SWA on December 21, 2008
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For anyone to recommend how to attach tower to roof peak we needto know how much wind load the antennas that you plan to install have. As for the base you should check the specifications the Rohn publishes. In my opinion you would probably be better served to erect the tower away from the house and guy it if you plan to have a medium to large antenna on the tower.Also please remember that 40' of tower gets very heavy when raising as an assembly.
Good luck
73's
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RE: Rohn Tower install
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by K9KJM on December 22, 2008
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IF you are going to have a hinge base to tilt the tower over, The house bracket will be carrying the ENTIRE wind load of the tower. The base will only be supporting the weight. So the base does not need to be any larger than the basic Rohn base, 3X3X3 feet, Or one cubic yard of concrete.
In such an installation, It is of extreme importance that you install the house bracket properly, Which means bolting it right through the wall, Near some lateral support, And having something like angle iron or a 2X4 running across several wall studs for strength.
A first step would be to make sure you can access the attic to do that interior work.
I would not trust simple lag screws from the outside for a project like this.
As mentioned, Follow the Rohn specs. Including gravel around the tower legs for drainage, etc.
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RE: Rohn Tower install
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by N5LRZ on December 22, 2008
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First off you jumped the gun.
The FIRST thing you need to do is to acquire and pay for any and all required permits and legal authorizations. This should be the very first thing you should do even before you think about concrete.
AFTER you acquire the proper permits, then look up your tower manufacturer and download for documentation purposes any and all information and diagrams on the installation of the tower in a tilt down configuration. If no such information is available then call the tower manufacturer and ask them to send you an install instructions for your intended tilt configuration.
BEFORE you install anything consult your landlord for their permission/authority to install as well as any and all insurance companies with whome you have policies. The landlord may say absolutly forbidden and the insurance companies may want certain qualifications on the install.
This is important, do not overlook. TAKE PUCTURES of each step of the install showing measuremnts of dimensions and dept using a standard measuring device such that you can clearly see the dimensions on said device. Take pictures of a bag of concrete to show what kind of concrete as well as pictures of the install of any rebar, pouring and finishing. Should anything legal in nature happen a picture is worth a thousand witnesses.
If at all possible use the manufacturer tilt plate for legal and safety reasons following the recommended height and type of tower for that particular plate. IF you have one manufactured remember that its better to make somethings with a little over-kill just in case.
Respect your neighbors property lines. Even if your neighbor says its OK to let your tower land in his yard place the tower and or set its height to where it does NOT. While this neighbor may not care if your antenna rests on his property or violates his property rights some OTHER PERSON may buy or move in next door and they just might have a legal objection. IF your antenna or tower goes on their property you now have a non-tilt tower that you have to climb to do your work--good by tilting feature.
Of course SAFETY SAFETY SAFETY at all times.
Putting up a tower is not as simple as digging a hole and sticking in some metal structure IF you want to do it proper and legal/legal safe.
OH PS..
IF you live in a Nazi Home Owners Assiciation aka HOA neighborhood and the terms of ownership say NO to towers then DO NOT put one up. HOAs wield great contractual power in some parts of the country. The Courts of Law can force you to take it down. Save yourself the work---be sly and think STEALTHY aka cannot even see the antenna when looking at it. Remember PRB1 will not protect you in a HOA case.
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RE: Rohn Tower install
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by AA4PB on December 22, 2008
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There are a couple of issues here. One is that Rohn 25G specs for the hinge bases are for no load on the tower. You can hinge the tower itself up but you can't have a rotor, mast, and antennas attached to the top while you do it.
Another is the attachment point to the house. In general, it takes some work inside the attic to tie in the bracket support to several roof rafters. You don't want to just run a couple of screws into the siding. Even with no load on the tower there is a whole lot of pull on the bracket when you first start lifting the tower into position.
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RE: Rohn Tower install
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by W8JI on December 22, 2008
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I have the Rohn drawings in front of me now.
The 4 foot square and four foot deep base is for **self supporting towers**. It will NOT work with a hinge base, and is not needed with a guyed tower.
A bracketed Rohn 25G requires a two foot diamter round hole four feet deep, and the base CAN NOT be hinged. Like the 4 foot unguyed unbracketed base, it has to have a section inserted in the concrete that the tower bolts to.
You cannot use a pier pin, you cannot use a hinge.
Now if you have structurally adequate brackets that anchored into a very solid wall with bolts and load spreading plates (NOT lag screws, they won't hold) you can use a hinge basebut you hardly need any concrete.
If someone is talking about a hinge base the tower has to be either guyed to Rohn specs or a structural engineer should approve the bracketing. I can tell you this first hand, lag screws into 2x4's in a wall will pull right out.
If someone is going to lag screw into a wall they better not have a hinge or plate base. It better be a section base without a pin or hinge.
You could do something less, but the tower won't have near the load rating it does in a proper install. Nearly 100% of the strength is in the bracket or guys when you use a hinge base.
73 Tom
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RE: Rohn Tower install
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by K1CJS on December 23, 2008
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Just one comment--you can go to e-Bay for your parts, but you never know what you may get. For a tower, a structure that you do NOT want to take chances with, get your materials from a reputable dealer. That way you are ASSURED of getting new, up-to-spec parts, not used and possibly damaged ones. You are going to be up on that tower. Is your life so inconsequential that you're willing to take chances on used parts?
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RE: Rohn Tower install
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by K5CQB on December 24, 2008
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Hi Ron,
Whew, you just bit off a lot here. First things first. You need to read, read and read some more on the cities codes and ordinances here; hint-search for "amateur radio"
http://www.sterlingcodifiers.com/ID/Eagle/index.htm
What your looking for should be under 8-3-5: UNIQUE LAND USES
This will let you know what the wonderful and oppressive city ordinance will and will not let you do. Looks like they will comply with prb1 BUT to exceed 35 feet you will have to justify the need to exceet 35 feet and get a conditional use permit, lovely.
Second, joining a local club or finding an elmer who has gone through the process will be invaluable.
Third, got to the critical tower site where you will find 4 pages of rohn tower documents. Study these very carefully to find out what Rohn recommends. The city will not issue a permit that conflicts with Rohn's recommendations. If that's your place on Ron lane then space should not be a problem.
http://www.criticaltowers.com/ROHN%20Industries/Media/html/hardware.html
If Eagle is like Fort Worth, it's gonna be a fight but you can win it.
Good Luck,
Jim
K5CQB
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